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 | 999840c | 2020-03-18 20:31:34 +0000 | [diff] [blame] | 17 | #include <vnet/tcp/tcp_inlines.h> |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 18 | #include <math.h> |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 19 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 20 | typedef enum _tcp_output_next |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 21 | { |
| 22 | TCP_OUTPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 23 | TCP_OUTPUT_NEXT_IP_LOOKUP, |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 24 | TCP_OUTPUT_NEXT_IP_REWRITE, |
| 25 | TCP_OUTPUT_NEXT_IP_ARP, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 26 | TCP_OUTPUT_N_NEXT |
| 27 | } tcp_output_next_t; |
| 28 | |
| 29 | #define foreach_tcp4_output_next \ |
| 30 | _ (DROP, "error-drop") \ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 31 | _ (IP_LOOKUP, "ip4-lookup") \ |
| 32 | _ (IP_REWRITE, "ip4-rewrite") \ |
| 33 | _ (IP_ARP, "ip4-arp") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 34 | |
| 35 | #define foreach_tcp6_output_next \ |
| 36 | _ (DROP, "error-drop") \ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 37 | _ (IP_LOOKUP, "ip6-lookup") \ |
| 38 | _ (IP_REWRITE, "ip6-rewrite") \ |
| 39 | _ (IP_ARP, "ip6-discover-neighbor") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 40 | |
| 41 | static char *tcp_error_strings[] = { |
| 42 | #define tcp_error(n,s) s, |
| 43 | #include <vnet/tcp/tcp_error.def> |
| 44 | #undef tcp_error |
| 45 | }; |
| 46 | |
| 47 | typedef struct |
| 48 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 49 | tcp_header_t tcp_header; |
| 50 | tcp_connection_t tcp_connection; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 51 | } tcp_tx_trace_t; |
| 52 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 53 | static u8 * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 54 | format_tcp_tx_trace (u8 * s, va_list * args) |
| 55 | { |
| 56 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 57 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 58 | tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *); |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 59 | tcp_connection_t *tc = &t->tcp_connection; |
Christophe Fontaine | d3c008d | 2017-10-02 18:10:54 +0200 | [diff] [blame] | 60 | u32 indent = format_get_indent (s); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 61 | |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 62 | s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc, |
| 63 | format_tcp_state, tc->state, format_white_space, indent, |
| 64 | format_tcp_header, &t->tcp_header, 128); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 65 | |
| 66 | return s; |
| 67 | } |
| 68 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 69 | #ifndef CLIB_MARCH_VARIANT |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 70 | static u8 |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 71 | tcp_window_compute_scale (u32 window) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 72 | { |
| 73 | u8 wnd_scale = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 74 | 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] | 75 | wnd_scale++; |
| 76 | return wnd_scale; |
| 77 | } |
| 78 | |
| 79 | /** |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 80 | * TCP's initial window |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 81 | */ |
| 82 | always_inline u32 |
| 83 | tcp_initial_wnd_unscaled (tcp_connection_t * tc) |
| 84 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 85 | /* RFC 6928 recommends the value lower. However at the time our connections |
| 86 | * are initialized, fifos may not be allocated. Therefore, advertise the |
| 87 | * smallest possible unscaled window size and update once fifos are |
| 88 | * assigned to the session. |
| 89 | */ |
| 90 | /* |
| 91 | tcp_update_rcv_mss (tc); |
| 92 | TCP_IW_N_SEGMENTS * tc->mss; |
| 93 | */ |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 94 | return tcp_cfg.min_rx_fifo; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 98 | * Compute initial window and scale factor. As per RFC1323, window field in |
| 99 | * SYN and SYN-ACK segments is never scaled. |
| 100 | */ |
| 101 | u32 |
| 102 | tcp_initial_window_to_advertise (tcp_connection_t * tc) |
| 103 | { |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 104 | /* Compute rcv wscale only if peer advertised support for it */ |
| 105 | if (tc->state != TCP_STATE_SYN_RCVD || tcp_opts_wscale (&tc->rcv_opts)) |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 106 | tc->rcv_wscale = tcp_window_compute_scale (tcp_cfg.max_rx_fifo); |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 107 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 108 | tc->rcv_wnd = tcp_initial_wnd_unscaled (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 109 | |
| 110 | return clib_min (tc->rcv_wnd, TCP_WND_MAX); |
| 111 | } |
| 112 | |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 113 | static inline void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 114 | tcp_update_rcv_wnd (tcp_connection_t * tc) |
| 115 | { |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 116 | u32 available_space, wnd; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 117 | i32 observed_wnd; |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 118 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 119 | /* |
| 120 | * Figure out how much space we have available |
| 121 | */ |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 122 | available_space = transport_max_rx_enqueue (&tc->connection); |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 123 | if (PREDICT_FALSE (available_space < tc->rcv_opts.mss)) |
Florin Coras | 182d219 | 2019-07-24 10:27:20 -0700 | [diff] [blame] | 124 | { |
| 125 | tc->rcv_wnd = 0; |
| 126 | return; |
| 127 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 128 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 129 | /* |
| 130 | * Use the above and what we know about what we've previously advertised |
| 131 | * to compute the new window |
| 132 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 133 | observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 134 | |
| 135 | /* Bad. Thou shalt not shrink */ |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 136 | if (PREDICT_FALSE ((i32) available_space < observed_wnd)) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 137 | { |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 138 | wnd = clib_max (observed_wnd, 0); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 139 | TCP_EVT (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 140 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 141 | else |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 142 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 143 | wnd = available_space; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 144 | } |
| 145 | |
Florin Coras | f2fe353 | 2020-05-08 16:23:38 +0000 | [diff] [blame^] | 146 | /* Make sure we have a multiple of 1 << rcv_wscale. We round up to |
| 147 | * avoid advertising a window less than mss which could happen if |
| 148 | * 1 << rcv_wscale < mss */ |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 149 | if (wnd && tc->rcv_wscale) |
Florin Coras | f2fe353 | 2020-05-08 16:23:38 +0000 | [diff] [blame^] | 150 | wnd = round_pow2 (wnd, 1 << tc->rcv_wscale); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 151 | |
| 152 | tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | /** |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 156 | * Compute and return window to advertise, scaled as per RFC1323 |
| 157 | */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 158 | static inline u32 |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 159 | tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state) |
| 160 | { |
| 161 | if (state < TCP_STATE_ESTABLISHED) |
| 162 | return tcp_initial_window_to_advertise (tc); |
| 163 | |
| 164 | tcp_update_rcv_wnd (tc); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 165 | return tc->rcv_wnd >> tc->rcv_wscale; |
| 166 | } |
| 167 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 168 | static int |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 169 | tcp_make_syn_options (tcp_connection_t * tc, tcp_options_t * opts) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 170 | { |
| 171 | u8 len = 0; |
| 172 | |
| 173 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 174 | opts->mss = tc->mss; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 175 | len += TCP_OPTION_LEN_MSS; |
| 176 | |
| 177 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 178 | opts->wscale = tc->rcv_wscale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 179 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 180 | |
| 181 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 182 | opts->tsval = tcp_time_now (); |
| 183 | opts->tsecr = 0; |
| 184 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 185 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 186 | if (TCP_USE_SACKS) |
| 187 | { |
| 188 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 189 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 190 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 191 | |
| 192 | /* Align to needed boundary */ |
| 193 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 194 | return len; |
| 195 | } |
| 196 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 197 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 198 | tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 199 | { |
| 200 | u8 len = 0; |
| 201 | |
| 202 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 203 | opts->mss = tc->mss; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 204 | len += TCP_OPTION_LEN_MSS; |
| 205 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 206 | if (tcp_opts_wscale (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 207 | { |
| 208 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
| 209 | opts->wscale = tc->rcv_wscale; |
| 210 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 211 | } |
| 212 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 213 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 214 | { |
| 215 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 216 | opts->tsval = tcp_time_now (); |
| 217 | opts->tsecr = tc->tsval_recent; |
| 218 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 219 | } |
| 220 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 221 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 222 | { |
| 223 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 224 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 225 | } |
| 226 | |
| 227 | /* Align to needed boundary */ |
| 228 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 229 | return len; |
| 230 | } |
| 231 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 232 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 233 | tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 234 | { |
| 235 | u8 len = 0; |
| 236 | |
| 237 | opts->flags = 0; |
| 238 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 239 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 240 | { |
| 241 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
Vladimir Kropylev | 1cfcb78 | 2019-07-02 11:25:26 +0300 | [diff] [blame] | 242 | opts->tsval = tcp_tstamp (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 243 | opts->tsecr = tc->tsval_recent; |
| 244 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 245 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 246 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 247 | { |
| 248 | if (vec_len (tc->snd_sacks)) |
| 249 | { |
| 250 | opts->flags |= TCP_OPTS_FLAG_SACK; |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 251 | if (tc->snd_sack_pos >= vec_len (tc->snd_sacks)) |
| 252 | tc->snd_sack_pos = 0; |
| 253 | opts->sacks = &tc->snd_sacks[tc->snd_sack_pos]; |
| 254 | opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos; |
| 255 | opts->n_sack_blocks = clib_min (opts->n_sack_blocks, |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 256 | TCP_OPTS_MAX_SACK_BLOCKS); |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 257 | tc->snd_sack_pos += opts->n_sack_blocks; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 258 | len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | /* Align to needed boundary */ |
| 263 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 264 | return len; |
| 265 | } |
| 266 | |
| 267 | always_inline int |
| 268 | tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts, |
| 269 | tcp_state_t state) |
| 270 | { |
| 271 | switch (state) |
| 272 | { |
| 273 | case TCP_STATE_ESTABLISHED: |
Florin Coras | 25579b4 | 2018-06-06 17:55:02 -0700 | [diff] [blame] | 274 | case TCP_STATE_CLOSE_WAIT: |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 275 | case TCP_STATE_FIN_WAIT_1: |
| 276 | case TCP_STATE_LAST_ACK: |
| 277 | case TCP_STATE_CLOSING: |
| 278 | case TCP_STATE_FIN_WAIT_2: |
| 279 | case TCP_STATE_TIME_WAIT: |
| 280 | case TCP_STATE_CLOSED: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 281 | return tcp_make_established_options (tc, opts); |
| 282 | case TCP_STATE_SYN_RCVD: |
| 283 | return tcp_make_synack_options (tc, opts); |
| 284 | case TCP_STATE_SYN_SENT: |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 285 | return tcp_make_syn_options (tc, opts); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 286 | default: |
Florin Coras | 371ca50 | 2018-02-21 12:07:41 -0800 | [diff] [blame] | 287 | clib_warning ("State not handled! %d", state); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 288 | return 0; |
| 289 | } |
| 290 | } |
| 291 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 292 | /** |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 293 | * Update burst send vars |
| 294 | * |
| 295 | * - Updates snd_mss to reflect the effective segment size that we can send |
| 296 | * by taking into account all TCP options, including SACKs. |
| 297 | * - Cache 'on the wire' options for reuse |
| 298 | * - Updates receive window which can be reused for a burst. |
| 299 | * |
| 300 | * This should *only* be called when doing bursts |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 301 | */ |
| 302 | void |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 303 | tcp_update_burst_snd_vars (tcp_connection_t * tc) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 304 | { |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 305 | tcp_main_t *tm = &tcp_main; |
| 306 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 307 | /* Compute options to be used for connection. These may be reused when |
| 308 | * sending data or to compute the effective mss (snd_mss) */ |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 309 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, |
| 310 | TCP_STATE_ESTABLISHED); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 311 | |
| 312 | /* XXX check if MTU has been updated */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 313 | 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] | 314 | ASSERT (tc->snd_mss > 0); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 315 | |
| 316 | tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 317 | &tc->snd_opts); |
| 318 | |
| 319 | tcp_update_rcv_wnd (tc); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 320 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 321 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 322 | tcp_bt_check_app_limited (tc); |
Florin Coras | ca2831a | 2019-07-04 17:05:59 -0700 | [diff] [blame] | 323 | |
| 324 | if (tc->snd_una == tc->snd_nxt) |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 325 | { |
| 326 | tcp_cc_event (tc, TCP_CC_EVT_START_TX); |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 327 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, TRANSPORT_PACER_MIN_BURST); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 328 | } |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 329 | } |
| 330 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 331 | #endif /* CLIB_MARCH_VARIANT */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 332 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 333 | static void * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 334 | tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 335 | { |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 336 | if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| 337 | vlib_buffer_free_one (vm, b->next_buffer); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 338 | /* Zero all flags but free list index and trace flag */ |
| 339 | b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 340 | b->current_data = 0; |
| 341 | b->current_length = 0; |
| 342 | b->total_length_not_including_first_buffer = 0; |
| 343 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 344 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 345 | /* Leave enough space for headers */ |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 346 | return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 347 | } |
| 348 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 349 | #ifndef CLIB_MARCH_VARIANT |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 350 | static void * |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 351 | tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 352 | { |
| 353 | ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 354 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 355 | b->total_length_not_including_first_buffer = 0; |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 356 | b->current_data = 0; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 357 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 358 | VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 359 | /* Leave enough space for headers */ |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 360 | return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 361 | } |
| 362 | |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 363 | |
| 364 | /* Compute TCP checksum in software when offloading is disabled for a connection */ |
| 365 | u16 |
| 366 | ip6_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0, |
| 367 | ip46_address_t * src, ip46_address_t * dst) |
| 368 | { |
| 369 | ip_csum_t sum0; |
| 370 | u16 payload_length_host_byte_order; |
| 371 | u32 i; |
| 372 | |
| 373 | /* Initialize checksum with ip header. */ |
| 374 | sum0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, p0)) + |
| 375 | clib_host_to_net_u16 (IP_PROTOCOL_TCP); |
| 376 | payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0); |
| 377 | |
| 378 | for (i = 0; i < ARRAY_LEN (src->ip6.as_uword); i++) |
| 379 | { |
| 380 | sum0 = ip_csum_with_carry |
| 381 | (sum0, clib_mem_unaligned (&src->ip6.as_uword[i], uword)); |
| 382 | sum0 = ip_csum_with_carry |
| 383 | (sum0, clib_mem_unaligned (&dst->ip6.as_uword[i], uword)); |
| 384 | } |
| 385 | |
| 386 | return ip_calculate_l4_checksum (vm, p0, sum0, |
| 387 | payload_length_host_byte_order, NULL, 0, |
| 388 | NULL); |
| 389 | } |
| 390 | |
| 391 | u16 |
| 392 | ip4_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0, |
| 393 | ip46_address_t * src, ip46_address_t * dst) |
| 394 | { |
| 395 | ip_csum_t sum0; |
| 396 | u32 payload_length_host_byte_order; |
| 397 | |
| 398 | payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0); |
| 399 | sum0 = |
| 400 | clib_host_to_net_u32 (payload_length_host_byte_order + |
| 401 | (IP_PROTOCOL_TCP << 16)); |
| 402 | |
| 403 | sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&src->ip4, u32)); |
| 404 | sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&dst->ip4, u32)); |
| 405 | |
| 406 | return ip_calculate_l4_checksum (vm, p0, sum0, |
| 407 | payload_length_host_byte_order, NULL, 0, |
| 408 | NULL); |
| 409 | } |
| 410 | |
| 411 | static inline u16 |
| 412 | tcp_compute_checksum (tcp_connection_t * tc, vlib_buffer_t * b) |
| 413 | { |
| 414 | u16 checksum = 0; |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 415 | if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD)) |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 416 | { |
| 417 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 418 | vlib_main_t *vm = wrk->vm; |
| 419 | |
| 420 | if (tc->c_is_ip4) |
| 421 | checksum = ip4_tcp_compute_checksum_custom |
| 422 | (vm, b, &tc->c_lcl_ip, &tc->c_rmt_ip); |
| 423 | else |
| 424 | checksum = ip6_tcp_compute_checksum_custom |
| 425 | (vm, b, &tc->c_lcl_ip, &tc->c_rmt_ip); |
| 426 | } |
| 427 | else |
| 428 | { |
| 429 | b->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; |
| 430 | } |
| 431 | return checksum; |
| 432 | } |
| 433 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 434 | /** |
| 435 | * Prepare ACK |
| 436 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 437 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 438 | tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state, |
| 439 | u8 flags) |
| 440 | { |
| 441 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 442 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 443 | tcp_header_t *th; |
| 444 | u16 wnd; |
| 445 | |
| 446 | wnd = tcp_window_to_advertise (tc, state); |
| 447 | |
| 448 | /* Make and write options */ |
| 449 | tcp_opts_len = tcp_make_established_options (tc, snd_opts); |
| 450 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 451 | |
| 452 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 453 | tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd); |
| 454 | |
| 455 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 456 | |
| 457 | th->checksum = tcp_compute_checksum (tc, b); |
| 458 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 459 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 460 | |
| 461 | if (wnd == 0) |
| 462 | tcp_zero_rwnd_sent_on (tc); |
| 463 | else |
| 464 | tcp_zero_rwnd_sent_off (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | /** |
| 468 | * Convert buffer to ACK |
| 469 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 470 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 471 | tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 472 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 473 | tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 474 | TCP_EVT (TCP_EVT_ACK_SENT, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 475 | tc->rcv_las = tc->rcv_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | /** |
| 479 | * Convert buffer to FIN-ACK |
| 480 | */ |
Florin Coras | 999840c | 2020-03-18 20:31:34 +0000 | [diff] [blame] | 481 | static void |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 482 | tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 483 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 484 | 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] | 485 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 486 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 487 | /** |
| 488 | * Convert buffer to SYN |
| 489 | */ |
| 490 | void |
| 491 | tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b) |
| 492 | { |
| 493 | u8 tcp_hdr_opts_len, tcp_opts_len; |
| 494 | tcp_header_t *th; |
| 495 | u16 initial_wnd; |
| 496 | tcp_options_t snd_opts; |
| 497 | |
| 498 | initial_wnd = tcp_initial_window_to_advertise (tc); |
| 499 | |
| 500 | /* Make and write options */ |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 501 | clib_memset (&snd_opts, 0, sizeof (snd_opts)); |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 502 | tcp_opts_len = tcp_make_syn_options (tc, &snd_opts); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 503 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 504 | |
| 505 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 506 | tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN, |
| 507 | initial_wnd); |
| 508 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
| 509 | tcp_options_write ((u8 *) (th + 1), &snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 510 | th->checksum = tcp_compute_checksum (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | /** |
| 514 | * Convert buffer to SYN-ACK |
| 515 | */ |
Florin Coras | 999840c | 2020-03-18 20:31:34 +0000 | [diff] [blame] | 516 | static void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 517 | tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 518 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 519 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 520 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 521 | tcp_header_t *th; |
| 522 | u16 initial_wnd; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 523 | |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 524 | clib_memset (snd_opts, 0, sizeof (*snd_opts)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 525 | initial_wnd = tcp_initial_window_to_advertise (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 526 | tcp_opts_len = tcp_make_synack_options (tc, snd_opts); |
| 527 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 528 | |
| 529 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 530 | tc->rcv_nxt, tcp_hdr_opts_len, |
| 531 | TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 532 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
| 533 | |
| 534 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 535 | th->checksum = tcp_compute_checksum (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 536 | } |
| 537 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 538 | static void |
| 539 | tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
| 540 | u8 is_ip4, u32 fib_index) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 541 | { |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 542 | tcp_main_t *tm = &tcp_main; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 543 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 544 | |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 545 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 546 | b->error = 0; |
| 547 | |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 548 | vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index; |
| 549 | vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 550 | |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 551 | tcp_trajectory_add_start (b, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 552 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 553 | session_add_pending_tx_buffer (vm->thread_index, bi, |
| 554 | tm->ipl_next_node[!is_ip4]); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 555 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 556 | if (vm->thread_index == 0 && vlib_num_workers ()) |
| 557 | session_queue_run_on_main_thread (wrk->vm); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 558 | } |
| 559 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 560 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 561 | tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
| 562 | u8 is_ip4) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 563 | { |
Florin Coras | 2a7ea2e | 2019-10-16 22:06:08 -0700 | [diff] [blame] | 564 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
| 565 | b->error = 0; |
| 566 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 567 | session_add_pending_tx_buffer (wrk->vm->thread_index, bi, |
| 568 | wrk->tco_next_node[!is_ip4]); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 569 | } |
| 570 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 571 | #endif /* CLIB_MARCH_VARIANT */ |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 572 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 573 | static int |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 574 | tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 575 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 576 | ip4_header_t *ih4; |
| 577 | ip6_header_t *ih6; |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 578 | tcp_header_t *th; |
| 579 | ip4_address_t src_ip4, dst_ip4; |
| 580 | ip6_address_t src_ip6, dst_ip6; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 581 | u16 src_port, dst_port; |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 582 | u32 tmp, len, seq, ack; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 583 | u8 flags; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 584 | |
| 585 | /* Find IP and TCP headers */ |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 586 | th = tcp_buffer_hdr (b); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 587 | |
| 588 | /* Save src and dst ip */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 589 | if (is_ip4) |
| 590 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 591 | ih4 = vlib_buffer_get_current (b); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 592 | ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40); |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 593 | src_ip4.as_u32 = ih4->src_address.as_u32; |
| 594 | dst_ip4.as_u32 = ih4->dst_address.as_u32; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 595 | } |
| 596 | else |
| 597 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 598 | ih6 = vlib_buffer_get_current (b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 599 | ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60); |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 600 | clib_memcpy_fast (&src_ip6, &ih6->src_address, sizeof (ip6_address_t)); |
| 601 | clib_memcpy_fast (&dst_ip6, &ih6->dst_address, sizeof (ip6_address_t)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 602 | } |
| 603 | |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 604 | src_port = th->src_port; |
| 605 | dst_port = th->dst_port; |
| 606 | flags = TCP_FLAG_RST; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 607 | |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 608 | /* |
| 609 | * RFC 793. If the ACK bit is off, sequence number zero is used, |
| 610 | * <SEQ=0><ACK=SEG.SEQ+SEG.LEN><CTL=RST,ACK> |
| 611 | * If the ACK bit is on, |
| 612 | * <SEQ=SEG.ACK><CTL=RST> |
| 613 | */ |
| 614 | if (tcp_ack (th)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 615 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 616 | seq = th->ack_number; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 617 | ack = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 618 | } |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 619 | else |
| 620 | { |
| 621 | flags |= TCP_FLAG_ACK; |
| 622 | tmp = clib_net_to_host_u32 (th->seq_number); |
| 623 | len = vnet_buffer (b)->tcp.data_len + tcp_is_syn (th) + tcp_is_fin (th); |
| 624 | ack = clib_host_to_net_u32 (tmp + len); |
| 625 | seq = 0; |
| 626 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 627 | |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 628 | tcp_reuse_buffer (vm, b); |
| 629 | tcp_trajectory_add_start (b, 4); |
| 630 | th = vlib_buffer_push_tcp_net_order (b, dst_port, src_port, seq, ack, |
| 631 | sizeof (tcp_header_t), flags, 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 632 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 633 | if (is_ip4) |
| 634 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 635 | ih4 = vlib_buffer_push_ip4 (vm, b, &dst_ip4, &src_ip4, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 636 | IP_PROTOCOL_TCP, 1); |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 637 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 638 | } |
| 639 | else |
| 640 | { |
| 641 | int bogus = ~0; |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 642 | ih6 = vlib_buffer_push_ip6 (vm, b, &dst_ip6, &src_ip6, IP_PROTOCOL_TCP); |
| 643 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 644 | ASSERT (!bogus); |
| 645 | } |
| 646 | |
| 647 | return 0; |
| 648 | } |
| 649 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 650 | #ifndef CLIB_MARCH_VARIANT |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 651 | /** |
| 652 | * Send reset without reusing existing buffer |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 653 | * |
| 654 | * It extracts connection info out of original packet |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 655 | */ |
| 656 | void |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 657 | tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, |
| 658 | u32 thread_index, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 659 | { |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 660 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 661 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 662 | vlib_buffer_t *b; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 663 | u32 bi, sw_if_index, fib_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 664 | u8 tcp_hdr_len, flags = 0; |
| 665 | tcp_header_t *th, *pkt_th; |
| 666 | u32 seq, ack; |
| 667 | ip4_header_t *ih4, *pkt_ih4; |
| 668 | ip6_header_t *ih6, *pkt_ih6; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 669 | fib_protocol_t fib_proto; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 670 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 671 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 672 | return; |
| 673 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 674 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 675 | sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX]; |
| 676 | fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; |
| 677 | 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] | 678 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 679 | |
| 680 | /* Make and write options */ |
| 681 | tcp_hdr_len = sizeof (tcp_header_t); |
| 682 | |
| 683 | if (is_ip4) |
| 684 | { |
| 685 | pkt_ih4 = vlib_buffer_get_current (pkt); |
| 686 | pkt_th = ip4_next_header (pkt_ih4); |
| 687 | } |
| 688 | else |
| 689 | { |
| 690 | pkt_ih6 = vlib_buffer_get_current (pkt); |
| 691 | pkt_th = ip6_next_header (pkt_ih6); |
| 692 | } |
| 693 | |
| 694 | if (tcp_ack (pkt_th)) |
| 695 | { |
| 696 | flags = TCP_FLAG_RST; |
| 697 | seq = pkt_th->ack_number; |
Florin Coras | 776f3d8 | 2018-11-02 08:23:58 -0700 | [diff] [blame] | 698 | ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 699 | } |
| 700 | else |
| 701 | { |
| 702 | flags = TCP_FLAG_RST | TCP_FLAG_ACK; |
| 703 | seq = 0; |
| 704 | ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end); |
| 705 | } |
| 706 | |
| 707 | th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port, |
| 708 | seq, ack, tcp_hdr_len, flags, 0); |
| 709 | |
| 710 | /* Swap src and dst ip */ |
| 711 | if (is_ip4) |
| 712 | { |
| 713 | ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40); |
| 714 | ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address, |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 715 | &pkt_ih4->src_address, IP_PROTOCOL_TCP, |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 716 | tcp_csum_offload (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 717 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
| 718 | } |
| 719 | else |
| 720 | { |
| 721 | int bogus = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 722 | ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) == |
| 723 | 0x60); |
Tarun Gupta | 2089c69 | 2019-11-04 16:35:59 -0800 | [diff] [blame] | 724 | ih6 = vlib_buffer_push_ip6_custom (vm, b, &pkt_ih6->dst_address, |
| 725 | &pkt_ih6->src_address, |
| 726 | IP_PROTOCOL_TCP, |
| 727 | tc->ipv6_flow_label); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 728 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
| 729 | ASSERT (!bogus); |
| 730 | } |
| 731 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 732 | tcp_enqueue_to_ip_lookup (wrk, b, bi, is_ip4, fib_index); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 733 | TCP_EVT (TCP_EVT_RST_SENT, tc); |
Florin Coras | 1f42101 | 2019-07-26 10:18:51 -0700 | [diff] [blame] | 734 | vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4), |
| 735 | TCP_ERROR_RST_SENT, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 736 | } |
| 737 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 738 | /** |
| 739 | * Build and set reset packet for connection |
| 740 | */ |
| 741 | void |
| 742 | tcp_send_reset (tcp_connection_t * tc) |
| 743 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 744 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 745 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 746 | vlib_buffer_t *b; |
| 747 | u32 bi; |
| 748 | tcp_header_t *th; |
| 749 | u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len; |
| 750 | u8 flags; |
| 751 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 752 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 753 | return; |
| 754 | b = vlib_get_buffer (vm, bi); |
| 755 | tcp_init_buffer (vm, b); |
| 756 | |
| 757 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 758 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
Florin Coras | 4e783b9 | 2020-03-23 23:24:19 +0000 | [diff] [blame] | 759 | advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 760 | flags = TCP_FLAG_RST; |
| 761 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 762 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 763 | advertise_wnd); |
| 764 | opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 765 | th->checksum = tcp_compute_checksum (tc, b); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 766 | ASSERT (opts_write_len == tc->snd_opts_len); |
| 767 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 768 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 769 | TCP_EVT (TCP_EVT_RST_SENT, tc); |
Florin Coras | 1f42101 | 2019-07-26 10:18:51 -0700 | [diff] [blame] | 770 | vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4), |
| 771 | TCP_ERROR_RST_SENT, 1); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 772 | } |
| 773 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 774 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 775 | tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 776 | vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 777 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 778 | if (tc->c_is_ip4) |
| 779 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 780 | vlib_buffer_push_ip4 (wrk->vm, b, &tc->c_lcl_ip4, &tc->c_rmt_ip4, |
| 781 | IP_PROTOCOL_TCP, tcp_csum_offload (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 782 | } |
| 783 | else |
| 784 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 785 | vlib_buffer_push_ip6_custom (wrk->vm, b, &tc->c_lcl_ip6, &tc->c_rmt_ip6, |
| 786 | IP_PROTOCOL_TCP, tc->ipv6_flow_label); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 787 | } |
| 788 | } |
| 789 | |
| 790 | /** |
| 791 | * Send SYN |
| 792 | * |
| 793 | * Builds a SYN packet for a half-open connection and sends it to ipx_lookup. |
| 794 | * The packet is not forwarded through tcpx_output to avoid doing lookups |
| 795 | * in the half_open pool. |
| 796 | */ |
| 797 | void |
| 798 | tcp_send_syn (tcp_connection_t * tc) |
| 799 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 800 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 801 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 802 | vlib_buffer_t *b; |
| 803 | u32 bi; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 804 | |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 805 | /* |
| 806 | * Setup retransmit and establish timers before requesting buffer |
| 807 | * such that we can return if we've ran out. |
| 808 | */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 809 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN, |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 810 | tc->rto * TCP_TO_TIMER_TICK); |
| 811 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 812 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 813 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 814 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN, 1); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 815 | return; |
| 816 | } |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 817 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 818 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 819 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 820 | tcp_make_syn (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 821 | |
| 822 | /* Measure RTT with this */ |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 823 | tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 824 | tc->rtt_seq = tc->snd_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 825 | tc->rto_boff = 0; |
| 826 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 827 | tcp_push_ip_hdr (wrk, tc, b); |
| 828 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 829 | TCP_EVT (TCP_EVT_SYN_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 830 | } |
| 831 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 832 | void |
| 833 | tcp_send_synack (tcp_connection_t * tc) |
| 834 | { |
| 835 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 836 | vlib_main_t *vm = wrk->vm; |
| 837 | vlib_buffer_t *b; |
| 838 | u32 bi; |
| 839 | |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 840 | tcp_retransmit_timer_force_update (&wrk->timer_wheel, tc); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 841 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 842 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 843 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 844 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 845 | return; |
| 846 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 847 | |
Florin Coras | df08478 | 2018-12-06 17:41:10 -0800 | [diff] [blame] | 848 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 849 | b = vlib_get_buffer (vm, bi); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 850 | tcp_init_buffer (vm, b); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 851 | tcp_make_synack (tc, b); |
| 852 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 853 | TCP_EVT (TCP_EVT_SYNACK_SENT, tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 854 | } |
| 855 | |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 856 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 857 | * Send FIN |
| 858 | */ |
| 859 | void |
| 860 | tcp_send_fin (tcp_connection_t * tc) |
| 861 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 862 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 863 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 864 | vlib_buffer_t *b; |
| 865 | u32 bi; |
| 866 | u8 fin_snt = 0; |
| 867 | |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 868 | fin_snt = tc->flags & TCP_CONN_FINSNT; |
| 869 | if (fin_snt) |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 870 | tc->snd_nxt -= 1; |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 871 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 872 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 873 | { |
| 874 | /* Out of buffers so program fin retransmit ASAP */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 875 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 876 | if (fin_snt) |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 877 | tc->snd_nxt += 1; |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 878 | else |
| 879 | /* Make sure retransmit retries a fin not data */ |
| 880 | tc->flags |= TCP_CONN_FINSNT; |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 881 | return; |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 882 | } |
| 883 | |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 884 | /* If we have non-dupacks programmed, no need to send them */ |
| 885 | if ((tc->flags & TCP_CONN_SNDACK) && !tc->pending_dupacks) |
| 886 | tc->flags &= ~TCP_CONN_SNDACK; |
| 887 | |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 888 | tcp_retransmit_timer_force_update (&wrk->timer_wheel, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 889 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 890 | tcp_init_buffer (vm, b); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 891 | tcp_make_fin (tc, b); |
Florin Coras | 2a7ea2e | 2019-10-16 22:06:08 -0700 | [diff] [blame] | 892 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 893 | TCP_EVT (TCP_EVT_FIN_SENT, tc); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 894 | /* Account for the FIN */ |
| 895 | tc->snd_nxt += 1; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 896 | if (!fin_snt) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 897 | { |
| 898 | tc->flags |= TCP_CONN_FINSNT; |
| 899 | tc->flags &= ~TCP_CONN_FINPNDG; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 900 | 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] | 901 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 902 | } |
| 903 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 904 | /** |
Florin Coras | fd24744 | 2019-03-12 16:56:26 -0700 | [diff] [blame] | 905 | * Push TCP header and update connection variables. Should only be called |
| 906 | * for segments with data, not for 'control' packets. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 907 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 908 | always_inline void |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 909 | tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt, |
| 910 | u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 911 | { |
Florin Coras | fd24744 | 2019-03-12 16:56:26 -0700 | [diff] [blame] | 912 | u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 913 | u32 advertise_wnd, data_len; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 914 | tcp_main_t *tm = &tcp_main; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 915 | tcp_header_t *th; |
| 916 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 917 | data_len = b->current_length; |
| 918 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 919 | data_len += b->total_length_not_including_first_buffer; |
| 920 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 921 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 922 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 923 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 924 | if (compute_opts) |
| 925 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 926 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 927 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 928 | |
| 929 | if (maybe_burst) |
| 930 | advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale; |
| 931 | else |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 932 | advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 933 | |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 934 | if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING)) |
| 935 | { |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 936 | if (seq_geq (tc->psh_seq, snd_nxt) |
| 937 | && seq_lt (tc->psh_seq, snd_nxt + data_len)) |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 938 | flags |= TCP_FLAG_PSH; |
| 939 | } |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 940 | 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] | 941 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 942 | advertise_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 943 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 944 | if (maybe_burst) |
| 945 | { |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 946 | clib_memcpy_fast ((u8 *) (th + 1), |
| 947 | tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 948 | tc->snd_opts_len); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 949 | } |
| 950 | else |
| 951 | { |
| 952 | u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
| 953 | ASSERT (len == tc->snd_opts_len); |
| 954 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 955 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 956 | /* |
| 957 | * Update connection variables |
| 958 | */ |
| 959 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 960 | if (update_snd_nxt) |
| 961 | tc->snd_nxt += data_len; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 962 | tc->rcv_las = tc->rcv_nxt; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 963 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 964 | tc->bytes_out += data_len; |
| 965 | tc->data_segs_out += 1; |
| 966 | |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 967 | th->checksum = tcp_compute_checksum (tc, b); |
| 968 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 969 | TCP_EVT (TCP_EVT_PKTIZE, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 970 | } |
| 971 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 972 | always_inline u32 |
| 973 | tcp_buffer_len (vlib_buffer_t * b) |
| 974 | { |
| 975 | u32 data_len = b->current_length; |
| 976 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 977 | data_len += b->total_length_not_including_first_buffer; |
| 978 | return data_len; |
| 979 | } |
| 980 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 981 | u32 |
Florin Coras | 14ed6df | 2019-03-06 21:13:42 -0800 | [diff] [blame] | 982 | tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b) |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 983 | { |
Florin Coras | 14ed6df | 2019-03-06 21:13:42 -0800 | [diff] [blame] | 984 | tcp_connection_t *tc = (tcp_connection_t *) tconn; |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 985 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 986 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 987 | tcp_bt_track_tx (tc, tcp_buffer_len (b)); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 988 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 989 | tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1, |
| 990 | /* update_snd_nxt */ 1); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 991 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 992 | 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] | 993 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
| 994 | /* If not tracking an ACK, start tracking */ |
| 995 | if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc)) |
| 996 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 997 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 998 | tc->rtt_seq = tc->snd_nxt; |
| 999 | } |
| 1000 | if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))) |
| 1001 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1002 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1003 | tcp_retransmit_timer_set (&wrk->timer_wheel, tc); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1004 | tc->rto_boff = 0; |
| 1005 | } |
| 1006 | tcp_trajectory_add_start (b, 3); |
| 1007 | return 0; |
| 1008 | } |
| 1009 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1010 | void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1011 | tcp_send_ack (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1012 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1013 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1014 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1015 | vlib_buffer_t *b; |
| 1016 | u32 bi; |
| 1017 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1018 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1019 | { |
| 1020 | tcp_update_rcv_wnd (tc); |
| 1021 | return; |
| 1022 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1023 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1024 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1025 | tcp_make_ack (tc, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1026 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1027 | } |
| 1028 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1029 | void |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1030 | tcp_program_ack (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1031 | { |
| 1032 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 1033 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1034 | session_add_self_custom_tx_evt (&tc->connection, 1); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1035 | tc->flags |= TCP_CONN_SNDACK; |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | void |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1040 | tcp_program_dupack (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1041 | { |
| 1042 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 1043 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1044 | session_add_self_custom_tx_evt (&tc->connection, 1); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1045 | tc->flags |= TCP_CONN_SNDACK; |
| 1046 | } |
| 1047 | if (tc->pending_dupacks < 255) |
| 1048 | tc->pending_dupacks += 1; |
| 1049 | } |
| 1050 | |
| 1051 | void |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1052 | tcp_program_retransmit (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1053 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1054 | if (!(tc->flags & TCP_CONN_RXT_PENDING)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1055 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1056 | session_add_self_custom_tx_evt (&tc->connection, 0); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1057 | tc->flags |= TCP_CONN_RXT_PENDING; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1058 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1059 | } |
| 1060 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1061 | /** |
| 1062 | * Delayed ack timer handler |
| 1063 | * |
| 1064 | * Sends delayed ACK when timer expires |
| 1065 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1066 | void |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1067 | tcp_timer_delack_handler (tcp_connection_t * tc) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1068 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1069 | tcp_send_ack (tc); |
| 1070 | } |
| 1071 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1072 | /** |
Florin Coras | 017dc45 | 2019-08-30 11:06:35 -0700 | [diff] [blame] | 1073 | * Send window update ack |
| 1074 | * |
| 1075 | * Ensures that it will be sent only once, after a zero rwnd has been |
| 1076 | * advertised in a previous ack, and only if rwnd has grown beyond a |
| 1077 | * configurable value. |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1078 | */ |
| 1079 | void |
| 1080 | tcp_send_window_update_ack (tcp_connection_t * tc) |
| 1081 | { |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1082 | if (tcp_zero_rwnd_sent (tc)) |
| 1083 | { |
Florin Coras | 017dc45 | 2019-08-30 11:06:35 -0700 | [diff] [blame] | 1084 | tcp_update_rcv_wnd (tc); |
| 1085 | if (tc->rcv_wnd >= tcp_cfg.rwnd_min_update_ack * tc->snd_mss) |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1086 | { |
| 1087 | tcp_zero_rwnd_sent_off (tc); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1088 | tcp_program_ack (tc); |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1089 | } |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | /** |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1094 | * Allocate a new buffer and build a new tcp segment |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1095 | * |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1096 | * @param wrk tcp worker |
| 1097 | * @param tc connection for which the segment will be allocated |
| 1098 | * @param offset offset of the first byte in the tx fifo |
| 1099 | * @param max_deq_byte segment size |
| 1100 | * @param[out] b pointer to buffer allocated |
| 1101 | * |
| 1102 | * @return the number of bytes in the segment or 0 if buffer cannot be |
| 1103 | * allocated or no data available |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1104 | */ |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1105 | static int |
| 1106 | tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1107 | u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1108 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1109 | u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer; |
| 1110 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1111 | u32 bi, seg_size; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1112 | int n_bytes = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1113 | u8 *data; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1114 | |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 1115 | seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1116 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1117 | /* |
| 1118 | * Prepare options |
| 1119 | */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1120 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 1121 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1122 | /* |
| 1123 | * Allocate and fill in buffer(s) |
| 1124 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1125 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1126 | /* Easy case, buffer size greater than mss */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1127 | if (PREDICT_TRUE (seg_size <= bytes_per_buffer)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1128 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1129 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1130 | return 0; |
| 1131 | *b = vlib_get_buffer (vm, bi); |
| 1132 | data = tcp_init_buffer (vm, *b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1133 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1134 | max_deq_bytes); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1135 | ASSERT (n_bytes == max_deq_bytes); |
| 1136 | b[0]->current_length = n_bytes; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1137 | tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, |
| 1138 | /* burst */ 0, /* update_snd_nxt */ 0); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1139 | } |
| 1140 | /* Split mss into multiple buffers */ |
| 1141 | else |
| 1142 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1143 | u32 chain_bi = ~0, n_bufs_per_seg, n_bufs; |
| 1144 | u16 n_peeked, len_to_deq; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1145 | vlib_buffer_t *chain_b, *prev_b; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1146 | int i; |
| 1147 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1148 | /* Make sure we have enough buffers */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1149 | n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1150 | vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1, |
| 1151 | CLIB_CACHE_LINE_BYTES); |
| 1152 | n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg); |
| 1153 | if (PREDICT_FALSE (n_bufs != n_bufs_per_seg)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1154 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1155 | if (n_bufs) |
| 1156 | vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); |
| 1157 | return 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1158 | } |
| 1159 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1160 | *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1161 | data = tcp_init_buffer (vm, *b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1162 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1163 | bytes_per_buffer - |
| 1164 | TRANSPORT_MAX_HDRS_LEN); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1165 | b[0]->current_length = n_bytes; |
| 1166 | b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; |
| 1167 | b[0]->total_length_not_including_first_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1168 | max_deq_bytes -= n_bytes; |
| 1169 | |
| 1170 | chain_b = *b; |
| 1171 | for (i = 1; i < n_bufs_per_seg; i++) |
| 1172 | { |
| 1173 | prev_b = chain_b; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1174 | len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1175 | chain_bi = wrk->tx_buffers[--n_bufs]; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1176 | chain_b = vlib_get_buffer (vm, chain_bi); |
| 1177 | chain_b->current_data = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1178 | data = vlib_buffer_get_current (chain_b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1179 | n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data, |
| 1180 | offset + n_bytes, |
| 1181 | len_to_deq); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1182 | ASSERT (n_peeked == len_to_deq); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1183 | n_bytes += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1184 | chain_b->current_length = n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1185 | chain_b->next_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1186 | |
| 1187 | /* update previous buffer */ |
| 1188 | prev_b->next_buffer = chain_bi; |
| 1189 | prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; |
| 1190 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1191 | max_deq_bytes -= n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1192 | b[0]->total_length_not_including_first_buffer += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1193 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1194 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1195 | tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, |
| 1196 | /* burst */ 0, /* update_snd_nxt */ 0); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1197 | |
| 1198 | if (PREDICT_FALSE (n_bufs)) |
| 1199 | { |
| 1200 | clib_warning ("not all buffers consumed"); |
| 1201 | vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); |
| 1202 | } |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1203 | } |
| 1204 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1205 | ASSERT (n_bytes > 0); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1206 | ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer); |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1207 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1208 | return n_bytes; |
| 1209 | } |
| 1210 | |
| 1211 | /** |
| 1212 | * Build a retransmit segment |
| 1213 | * |
| 1214 | * @return the number of bytes in the segment or 0 if there's nothing to |
| 1215 | * retransmit |
| 1216 | */ |
| 1217 | static u32 |
| 1218 | tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk, |
| 1219 | tcp_connection_t * tc, u32 offset, |
| 1220 | u32 max_deq_bytes, vlib_buffer_t ** b) |
| 1221 | { |
| 1222 | u32 start, available_bytes; |
| 1223 | int n_bytes = 0; |
| 1224 | |
| 1225 | ASSERT (tc->state >= TCP_STATE_ESTABLISHED); |
| 1226 | ASSERT (max_deq_bytes != 0); |
| 1227 | |
| 1228 | /* |
| 1229 | * Make sure we can retransmit something |
| 1230 | */ |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1231 | available_bytes = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1232 | ASSERT (available_bytes >= offset); |
| 1233 | available_bytes -= offset; |
| 1234 | if (!available_bytes) |
| 1235 | return 0; |
| 1236 | |
| 1237 | max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes); |
| 1238 | max_deq_bytes = clib_min (available_bytes, max_deq_bytes); |
| 1239 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1240 | start = tc->snd_una + offset; |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1241 | ASSERT (seq_leq (start + max_deq_bytes, tc->snd_nxt)); |
| 1242 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1243 | n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b); |
| 1244 | if (!n_bytes) |
| 1245 | return 0; |
| 1246 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1247 | tc->snd_rxt_bytes += n_bytes; |
| 1248 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1249 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1250 | tcp_bt_track_rxt (tc, start, start + n_bytes); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1251 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1252 | tc->bytes_retrans += n_bytes; |
| 1253 | tc->segs_retrans += 1; |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1254 | tcp_worker_stats_inc (wrk, rxt_segs, 1); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1255 | TCP_EVT (TCP_EVT_CC_RTX, tc, offset, n_bytes); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1256 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1257 | return n_bytes; |
| 1258 | } |
| 1259 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1260 | static void |
| 1261 | tcp_check_sack_reneging (tcp_connection_t * tc) |
| 1262 | { |
| 1263 | sack_scoreboard_t *sb = &tc->sack_sb; |
| 1264 | sack_scoreboard_hole_t *hole; |
| 1265 | |
| 1266 | hole = scoreboard_first_hole (sb); |
| 1267 | if (!sb->is_reneging && (!hole || hole->start == tc->snd_una)) |
| 1268 | return; |
| 1269 | |
| 1270 | scoreboard_clear_reneging (sb, tc->snd_una, tc->snd_nxt); |
| 1271 | } |
| 1272 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1273 | /** |
| 1274 | * Reset congestion control, switch cwnd to loss window and try again. |
| 1275 | */ |
| 1276 | static void |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1277 | tcp_cc_init_rxt_timeout (tcp_connection_t * tc) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1278 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1279 | TCP_EVT (TCP_EVT_CC_EVT, tc, 6); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1280 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1281 | tc->prev_ssthresh = tc->ssthresh; |
| 1282 | tc->prev_cwnd = tc->cwnd; |
| 1283 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1284 | /* If we entrered loss without fast recovery, notify cc algo of the |
| 1285 | * congestion event such that it can update ssthresh and its state */ |
| 1286 | if (!tcp_in_fastrecovery (tc)) |
| 1287 | tcp_cc_congestion (tc); |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1288 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1289 | /* Let cc algo decide loss cwnd and ssthresh post unrecovered loss */ |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1290 | tcp_cc_loss (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1291 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1292 | tc->rtt_ts = 0; |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1293 | tc->cwnd_acc_bytes = 0; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1294 | tc->tr_occurences += 1; |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1295 | tcp_recovery_on (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1296 | } |
| 1297 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1298 | void |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1299 | tcp_timer_retransmit_handler (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1300 | { |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1301 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1302 | vlib_main_t *vm = wrk->vm; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1303 | vlib_buffer_t *b = 0; |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1304 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1305 | |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1306 | tcp_worker_stats_inc (wrk, tr_events, 1); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1307 | |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1308 | /* Should be handled by a different handler */ |
| 1309 | if (PREDICT_FALSE (tc->state == TCP_STATE_SYN_SENT)) |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1310 | return; |
| 1311 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1312 | /* Wait-close and retransmit could pop at the same time */ |
| 1313 | if (tc->state == TCP_STATE_CLOSED) |
| 1314 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1315 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1316 | if (tc->state >= TCP_STATE_ESTABLISHED) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1317 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1318 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1319 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1320 | /* Lost FIN, retransmit and return */ |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1321 | if (tc->flags & TCP_CONN_FINSNT) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1322 | { |
| 1323 | tcp_send_fin (tc); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1324 | tc->rto_boff += 1; |
| 1325 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1326 | return; |
| 1327 | } |
| 1328 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1329 | /* Shouldn't be here. This condition is tricky because it has to take |
| 1330 | * into account boff > 0 due to persist timeout. */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1331 | if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_nxt) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1332 | || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion) |
| 1333 | && !tcp_flight_size (tc))) |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1334 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1335 | ASSERT (!tcp_in_recovery (tc)); |
| 1336 | tc->rto_boff = 0; |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1337 | return; |
| 1338 | } |
| 1339 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1340 | /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due |
| 1341 | * to persist timer timeout */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1342 | if (!tcp_in_recovery (tc) && tc->rto_boff > 0) |
| 1343 | { |
| 1344 | tc->rto_boff = 0; |
| 1345 | tcp_update_rto (tc); |
| 1346 | } |
| 1347 | |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1348 | /* Peer is dead or network connectivity is lost. Close connection. |
| 1349 | * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For |
| 1350 | * a min rto of 0.2s we need to retry about 8 times. */ |
| 1351 | if (tc->rto_boff >= TCP_RTO_BOFF_MAX) |
| 1352 | { |
| 1353 | tcp_send_reset (tc); |
| 1354 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 1355 | session_transport_closing_notify (&tc->connection); |
Florin Coras | 52be674 | 2019-11-14 23:32:08 -0800 | [diff] [blame] | 1356 | session_transport_closed_notify (&tc->connection); |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1357 | tcp_connection_timers_reset (tc); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 1358 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1359 | tcp_worker_stats_inc (wrk, tr_abort, 1); |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1360 | return; |
| 1361 | } |
| 1362 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1363 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
| 1364 | tcp_check_sack_reneging (tc); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1365 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1366 | /* Update send congestion to make sure that rxt has data to send */ |
| 1367 | tc->snd_congestion = tc->snd_nxt; |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1368 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1369 | /* Send the first unacked segment. If we're short on buffers, return |
| 1370 | * as soon as possible */ |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1371 | n_bytes = clib_min (tc->snd_mss, tc->snd_nxt - tc->snd_una); |
| 1372 | n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, n_bytes, &b); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1373 | if (!n_bytes) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1374 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1375 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1376 | return; |
| 1377 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1378 | |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1379 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1380 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1381 | |
| 1382 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1383 | tcp_retransmit_timer_force_update (&wrk->timer_wheel, tc); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1384 | |
| 1385 | tc->rto_boff += 1; |
| 1386 | if (tc->rto_boff == 1) |
| 1387 | { |
| 1388 | tcp_cc_init_rxt_timeout (tc); |
| 1389 | /* Record timestamp. Eifel detection algorithm RFC3522 */ |
| 1390 | tc->snd_rxt_ts = tcp_tstamp (tc); |
| 1391 | } |
| 1392 | |
| 1393 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1394 | scoreboard_init_rxt (&tc->sack_sb, tc->snd_una + n_bytes); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1395 | |
| 1396 | tcp_program_retransmit (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1397 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1398 | /* Retransmit SYN-ACK */ |
| 1399 | else if (tc->state == TCP_STATE_SYN_RCVD) |
| 1400 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1401 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1402 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1403 | tc->rtt_ts = 0; |
| 1404 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1405 | /* Passive open establish timeout */ |
| 1406 | if (tc->rto > TCP_ESTABLISH_TIME >> 1) |
| 1407 | { |
| 1408 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 1409 | tcp_connection_timers_reset (tc); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 1410 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1411 | tcp_worker_stats_inc (wrk, tr_abort, 1); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1412 | return; |
| 1413 | } |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1414 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1415 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1416 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1417 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1418 | return; |
| 1419 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1420 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1421 | tc->rto_boff += 1; |
| 1422 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1423 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1424 | |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1425 | tcp_retransmit_timer_force_update (&wrk->timer_wheel, tc); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1426 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1427 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1428 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1429 | tcp_make_synack (tc, b); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1430 | TCP_EVT (TCP_EVT_SYN_RXT, tc, 1); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1431 | |
| 1432 | /* Retransmit timer already updated, just enqueue to output */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1433 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1434 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1435 | else |
| 1436 | { |
| 1437 | ASSERT (tc->state == TCP_STATE_CLOSED); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1438 | return; |
| 1439 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1440 | } |
| 1441 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1442 | /** |
| 1443 | * SYN retransmit timer handler. Active open only. |
| 1444 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1445 | void |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1446 | tcp_timer_retransmit_syn_handler (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1447 | { |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1448 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1449 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1450 | vlib_buffer_t *b = 0; |
| 1451 | u32 bi; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1452 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1453 | /* Note: the connection may have transitioned to ESTABLISHED... */ |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1454 | if (PREDICT_FALSE (tc->state != TCP_STATE_SYN_SENT)) |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1455 | return; |
| 1456 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1457 | /* Half-open connection actually moved to established but we were |
| 1458 | * waiting for syn retransmit to pop to call cleanup from the right |
| 1459 | * thread. */ |
| 1460 | if (tc->flags & TCP_CONN_HALF_OPEN_DONE) |
| 1461 | { |
| 1462 | if (tcp_half_open_connection_cleanup (tc)) |
| 1463 | TCP_DBG ("could not remove half-open connection"); |
| 1464 | return; |
| 1465 | } |
| 1466 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1467 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1468 | tc->rtt_ts = 0; |
| 1469 | |
| 1470 | /* Active open establish timeout */ |
| 1471 | if (tc->rto >= TCP_ESTABLISH_TIME >> 1) |
| 1472 | { |
Florin Coras | 00e01d3 | 2019-10-21 16:07:46 -0700 | [diff] [blame] | 1473 | session_stream_connect_notify (&tc->connection, SESSION_E_TIMEDOUT); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1474 | tcp_connection_cleanup (tc); |
| 1475 | return; |
| 1476 | } |
| 1477 | |
| 1478 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
| 1479 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1480 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN, 1); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1481 | return; |
| 1482 | } |
| 1483 | |
| 1484 | /* Try without increasing RTO a number of times. If this fails, |
| 1485 | * start growing RTO exponentially */ |
| 1486 | tc->rto_boff += 1; |
| 1487 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1488 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1489 | |
| 1490 | b = vlib_get_buffer (vm, bi); |
| 1491 | tcp_init_buffer (vm, b); |
| 1492 | tcp_make_syn (tc, b); |
| 1493 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1494 | TCP_EVT (TCP_EVT_SYN_RXT, tc, 0); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1495 | |
| 1496 | /* This goes straight to ipx_lookup */ |
| 1497 | tcp_push_ip_hdr (wrk, tc, b); |
| 1498 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
| 1499 | |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1500 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN, |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1501 | tc->rto * TCP_TO_TIMER_TICK); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1502 | } |
| 1503 | |
| 1504 | /** |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1505 | * Got 0 snd_wnd from peer, try to do something about it. |
| 1506 | * |
| 1507 | */ |
| 1508 | void |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1509 | tcp_timer_persist_handler (tcp_connection_t * tc) |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1510 | { |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1511 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1512 | u32 bi, max_snd_bytes, available_bytes, offset; |
| 1513 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 1514 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1515 | vlib_buffer_t *b; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1516 | int n_bytes = 0; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1517 | u8 *data; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1518 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1519 | /* Problem already solved or worse */ |
Florin Coras | 7e74bf3 | 2019-03-06 16:51:58 -0800 | [diff] [blame] | 1520 | if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss |
| 1521 | || (tc->flags & TCP_CONN_FINSNT)) |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1522 | goto update_scheduler; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1523 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1524 | available_bytes = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1525 | offset = tc->snd_nxt - tc->snd_una; |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1526 | |
| 1527 | /* Reprogram persist if no new bytes available to send. We may have data |
| 1528 | * next time */ |
| 1529 | if (!available_bytes) |
| 1530 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1531 | tcp_persist_timer_set (&wrk->timer_wheel, tc); |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1532 | return; |
| 1533 | } |
| 1534 | |
| 1535 | if (available_bytes <= offset) |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1536 | goto update_scheduler; |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1537 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1538 | /* Increment RTO backoff */ |
| 1539 | tc->rto_boff += 1; |
| 1540 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1541 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1542 | /* |
| 1543 | * Try to force the first unsent segment (or buffer) |
| 1544 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1545 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1546 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1547 | tcp_persist_timer_set (&wrk->timer_wheel, tc); |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1548 | return; |
| 1549 | } |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1550 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1551 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1552 | data = tcp_init_buffer (vm, b); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1553 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1554 | tcp_validate_txf_size (tc, offset); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1555 | 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] | 1556 | max_snd_bytes = clib_min (tc->snd_mss, |
| 1557 | tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN); |
| 1558 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1559 | max_snd_bytes); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1560 | b->current_length = n_bytes; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1561 | ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT) |
| 1562 | || tc->snd_nxt == tc->snd_una_max |
| 1563 | || tc->rto_boff > 1)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1564 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1565 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | dd60b1b | 2019-10-07 17:19:09 -0700 | [diff] [blame] | 1566 | { |
| 1567 | tcp_bt_check_app_limited (tc); |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1568 | tcp_bt_track_tx (tc, n_bytes); |
Florin Coras | dd60b1b | 2019-10-07 17:19:09 -0700 | [diff] [blame] | 1569 | } |
| 1570 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1571 | tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, |
| 1572 | /* burst */ 0, /* update_snd_nxt */ 1); |
| 1573 | 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] | 1574 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1575 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1576 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1577 | /* Just sent new data, enable retransmit */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1578 | tcp_retransmit_timer_update (&wrk->timer_wheel, tc); |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1579 | |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 1580 | return; |
| 1581 | |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1582 | update_scheduler: |
| 1583 | |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 1584 | if (tcp_is_descheduled (tc)) |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1585 | transport_connection_reschedule (&tc->connection); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1586 | } |
| 1587 | |
| 1588 | /** |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1589 | * Retransmit first unacked segment |
| 1590 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1591 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1592 | 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] | 1593 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1594 | vlib_main_t *vm = wrk->vm; |
| 1595 | vlib_buffer_t *b; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1596 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1597 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1598 | TCP_EVT (TCP_EVT_CC_EVT, tc, 1); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1599 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1600 | 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] | 1601 | if (!n_bytes) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1602 | return -1; |
| 1603 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1604 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1605 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1606 | |
| 1607 | return 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1608 | } |
| 1609 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1610 | static int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1611 | tcp_transmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1612 | u32 burst_size) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1613 | { |
Florin Coras | 635acbf | 2019-07-31 14:11:05 -0700 | [diff] [blame] | 1614 | u32 offset, n_segs = 0, n_written, bi, available_wnd; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1615 | vlib_main_t *vm = wrk->vm; |
| 1616 | vlib_buffer_t *b = 0; |
| 1617 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1618 | offset = tc->snd_nxt - tc->snd_una; |
Florin Coras | 635acbf | 2019-07-31 14:11:05 -0700 | [diff] [blame] | 1619 | available_wnd = tc->snd_wnd - offset; |
| 1620 | burst_size = clib_min (burst_size, available_wnd / tc->snd_mss); |
| 1621 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1622 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 1623 | tcp_bt_check_app_limited (tc); |
| 1624 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1625 | while (n_segs < burst_size) |
| 1626 | { |
| 1627 | n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b); |
| 1628 | if (!n_written) |
| 1629 | goto done; |
| 1630 | |
| 1631 | bi = vlib_get_buffer_index (vm, b); |
| 1632 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
| 1633 | offset += n_written; |
| 1634 | n_segs += 1; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1635 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1636 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 1637 | tcp_bt_track_tx (tc, n_written); |
| 1638 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1639 | tc->snd_nxt += n_written; |
| 1640 | 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] | 1641 | } |
| 1642 | |
| 1643 | done: |
| 1644 | return n_segs; |
| 1645 | } |
| 1646 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1647 | /** |
| 1648 | * Estimate send space using proportional rate reduction (RFC6937) |
| 1649 | */ |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1650 | int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1651 | tcp_fastrecovery_prr_snd_space (tcp_connection_t * tc) |
| 1652 | { |
| 1653 | u32 pipe, prr_out; |
| 1654 | int space; |
| 1655 | |
| 1656 | pipe = tcp_flight_size (tc); |
| 1657 | prr_out = tc->snd_rxt_bytes + (tc->snd_nxt - tc->snd_congestion); |
| 1658 | |
| 1659 | if (pipe > tc->ssthresh) |
| 1660 | { |
| 1661 | space = ((int) tc->prr_delivered * ((f64) tc->ssthresh / tc->prev_cwnd)) |
| 1662 | - prr_out; |
| 1663 | } |
| 1664 | else |
| 1665 | { |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1666 | int limit; |
| 1667 | limit = clib_max ((int) (tc->prr_delivered - prr_out), 0) + tc->snd_mss; |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1668 | space = clib_min (tc->ssthresh - pipe, limit); |
| 1669 | } |
| 1670 | space = clib_max (space, prr_out ? 0 : tc->snd_mss); |
| 1671 | return space; |
| 1672 | } |
| 1673 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1674 | static inline u8 |
| 1675 | tcp_retransmit_should_retry_head (tcp_connection_t * tc, |
| 1676 | sack_scoreboard_t * sb) |
| 1677 | { |
| 1678 | u32 tx_adv_sack = sb->high_sacked - tc->snd_congestion; |
| 1679 | f64 rr = (f64) tc->ssthresh / tc->prev_cwnd; |
| 1680 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 1681 | if (tcp_fastrecovery_first (tc)) |
| 1682 | return 1; |
| 1683 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1684 | return (tx_adv_sack > (tc->snd_una - tc->prr_start) * rr); |
| 1685 | } |
| 1686 | |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1687 | static inline u8 |
| 1688 | tcp_max_tx_deq (tcp_connection_t * tc) |
| 1689 | { |
| 1690 | return (transport_max_tx_dequeue (&tc->connection) |
| 1691 | - (tc->snd_nxt - tc->snd_una)); |
| 1692 | } |
| 1693 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1694 | #define scoreboard_rescue_rxt_valid(_sb, _tc) \ |
| 1695 | (seq_geq (_sb->rescue_rxt, _tc->snd_una) \ |
| 1696 | && seq_leq (_sb->rescue_rxt, _tc->snd_congestion)) |
| 1697 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1698 | /** |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1699 | * Do retransmit with SACKs |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1700 | */ |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1701 | static int |
| 1702 | tcp_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1703 | u32 burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1704 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1705 | u32 n_written = 0, offset, max_bytes, n_segs = 0; |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1706 | u8 snd_limited = 0, can_rescue = 0; |
| 1707 | u32 bi, max_deq, burst_bytes; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1708 | sack_scoreboard_hole_t *hole; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1709 | vlib_main_t *vm = wrk->vm; |
| 1710 | vlib_buffer_t *b = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1711 | sack_scoreboard_t *sb; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1712 | int snd_space; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1713 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1714 | ASSERT (tcp_in_cong_recovery (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1715 | |
Florin Coras | a8e71c8 | 2019-10-22 19:01:39 -0700 | [diff] [blame] | 1716 | burst_bytes = transport_connection_tx_pacer_burst (&tc->connection); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1717 | burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); |
| 1718 | if (!burst_size) |
| 1719 | { |
| 1720 | tcp_program_retransmit (tc); |
| 1721 | return 0; |
| 1722 | } |
| 1723 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1724 | if (tcp_in_recovery (tc)) |
| 1725 | snd_space = tcp_available_cc_snd_space (tc); |
| 1726 | else |
| 1727 | snd_space = tcp_fastrecovery_prr_snd_space (tc); |
| 1728 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1729 | if (snd_space < tc->snd_mss) |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1730 | goto done; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1731 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1732 | sb = &tc->sack_sb; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1733 | |
| 1734 | /* Check if snd_una is a lost retransmit */ |
Florin Coras | 8a8b05c | 2019-10-16 10:07:39 -0700 | [diff] [blame] | 1735 | if (pool_elts (sb->holes) |
| 1736 | && seq_gt (sb->high_sacked, tc->snd_congestion) |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1737 | && tc->rxt_head != tc->snd_una |
| 1738 | && tcp_retransmit_should_retry_head (tc, sb)) |
| 1739 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1740 | max_bytes = clib_min (tc->snd_mss, tc->snd_congestion - tc->snd_una); |
| 1741 | n_written = tcp_prepare_retransmit_segment (wrk, tc, 0, max_bytes, &b); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1742 | if (!n_written) |
| 1743 | { |
| 1744 | tcp_program_retransmit (tc); |
| 1745 | goto done; |
| 1746 | } |
| 1747 | bi = vlib_get_buffer_index (vm, b); |
| 1748 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
| 1749 | n_segs = 1; |
| 1750 | |
| 1751 | tc->rxt_head = tc->snd_una; |
| 1752 | tc->rxt_delivered += n_written; |
| 1753 | tc->prr_delivered += n_written; |
| 1754 | ASSERT (tc->rxt_delivered <= tc->snd_rxt_bytes); |
| 1755 | } |
| 1756 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 1757 | tcp_fastrecovery_first_off (tc); |
| 1758 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1759 | TCP_EVT (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1760 | hole = scoreboard_get_hole (sb, sb->cur_rxt_hole); |
| 1761 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1762 | max_deq = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1763 | max_deq -= tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1764 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1765 | while (snd_space > 0 && n_segs < burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1766 | { |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1767 | hole = scoreboard_next_rxt_hole (sb, hole, max_deq != 0, &can_rescue, |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1768 | &snd_limited); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1769 | if (!hole) |
| 1770 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1771 | /* We are out of lost holes to retransmit so send some new data. */ |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1772 | if (max_deq > tc->snd_mss) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1773 | { |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1774 | u32 n_segs_new; |
| 1775 | int av_wnd; |
| 1776 | |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1777 | /* Make sure we don't exceed available window and leave space |
| 1778 | * for one more packet, to avoid zero window acks */ |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1779 | av_wnd = (int) tc->snd_wnd - (tc->snd_nxt - tc->snd_una); |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1780 | av_wnd = clib_max (av_wnd - tc->snd_mss, 0); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1781 | snd_space = clib_min (snd_space, av_wnd); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1782 | snd_space = clib_min (max_deq, snd_space); |
| 1783 | burst_size = clib_min (burst_size - n_segs, |
| 1784 | snd_space / tc->snd_mss); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1785 | burst_size = clib_min (burst_size, TCP_RXT_MAX_BURST); |
| 1786 | n_segs_new = tcp_transmit_unsent (wrk, tc, burst_size); |
| 1787 | if (max_deq > n_segs_new * tc->snd_mss) |
| 1788 | tcp_program_retransmit (tc); |
| 1789 | |
| 1790 | n_segs += n_segs_new; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1791 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1792 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1793 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1794 | if (tcp_in_recovery (tc) || !can_rescue |
| 1795 | || scoreboard_rescue_rxt_valid (sb, tc)) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1796 | break; |
| 1797 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1798 | /* If rescue rxt undefined or less than snd_una then one segment of |
| 1799 | * up to SMSS octets that MUST include the highest outstanding |
| 1800 | * unSACKed sequence number SHOULD be returned, and RescueRxt set to |
| 1801 | * RecoveryPoint. HighRxt MUST NOT be updated. |
| 1802 | */ |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1803 | hole = scoreboard_last_hole (sb); |
| 1804 | max_bytes = clib_min (tc->snd_mss, hole->end - hole->start); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1805 | max_bytes = clib_min (max_bytes, snd_space); |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1806 | offset = hole->end - tc->snd_una - max_bytes; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1807 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, |
| 1808 | max_bytes, &b); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1809 | if (!n_written) |
| 1810 | goto done; |
| 1811 | |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1812 | sb->rescue_rxt = tc->snd_congestion; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1813 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1814 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1815 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1816 | break; |
| 1817 | } |
| 1818 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1819 | max_bytes = clib_min (hole->end - sb->high_rxt, snd_space); |
| 1820 | max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes; |
| 1821 | if (max_bytes == 0) |
| 1822 | break; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1823 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1824 | offset = sb->high_rxt - tc->snd_una; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1825 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, |
| 1826 | &b); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1827 | ASSERT (n_written <= snd_space); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1828 | |
| 1829 | /* Nothing left to retransmit */ |
| 1830 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1831 | break; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1832 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1833 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1834 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1835 | |
| 1836 | sb->high_rxt += n_written; |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1837 | ASSERT (seq_leq (sb->high_rxt, tc->snd_nxt)); |
| 1838 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1839 | snd_space -= n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1840 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1841 | } |
| 1842 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1843 | if (hole) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1844 | tcp_program_retransmit (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1845 | |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1846 | done: |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1847 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1848 | transport_connection_tx_pacer_reset_bucket (&tc->connection, 0); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1849 | return n_segs; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1850 | } |
| 1851 | |
| 1852 | /** |
| 1853 | * Fast retransmit without SACK info |
| 1854 | */ |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1855 | static int |
| 1856 | tcp_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1857 | u32 burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1858 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1859 | u32 n_written = 0, offset = 0, bi, max_deq, n_segs_now, max_bytes; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1860 | u32 burst_bytes, sent_bytes; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1861 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1862 | int snd_space, n_segs = 0; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1863 | u8 cc_limited = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1864 | vlib_buffer_t *b; |
| 1865 | |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1866 | ASSERT (tcp_in_cong_recovery (tc)); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1867 | TCP_EVT (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1868 | |
Florin Coras | a8e71c8 | 2019-10-22 19:01:39 -0700 | [diff] [blame] | 1869 | burst_bytes = transport_connection_tx_pacer_burst (&tc->connection); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1870 | burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); |
| 1871 | if (!burst_size) |
| 1872 | { |
| 1873 | tcp_program_retransmit (tc); |
| 1874 | return 0; |
| 1875 | } |
| 1876 | |
Florin Coras | 87a9bf8 | 2019-06-12 11:26:35 -0700 | [diff] [blame] | 1877 | snd_space = tcp_available_cc_snd_space (tc); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1878 | cc_limited = snd_space < burst_bytes; |
Florin Coras | 87a9bf8 | 2019-06-12 11:26:35 -0700 | [diff] [blame] | 1879 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1880 | if (!tcp_fastrecovery_first (tc)) |
| 1881 | goto send_unsent; |
| 1882 | |
| 1883 | /* RFC 6582: [If a partial ack], retransmit the first unacknowledged |
| 1884 | * segment. */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1885 | while (snd_space > 0 && n_segs < burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1886 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1887 | max_bytes = clib_min (tc->snd_mss, |
| 1888 | tc->snd_congestion - tc->snd_una - offset); |
| 1889 | if (!max_bytes) |
| 1890 | break; |
| 1891 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, |
| 1892 | &b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1893 | |
| 1894 | /* Nothing left to retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1895 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1896 | break; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1897 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1898 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1899 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1900 | snd_space -= n_written; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1901 | offset += n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1902 | n_segs += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1903 | } |
| 1904 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1905 | if (n_segs == burst_size) |
| 1906 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1907 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1908 | send_unsent: |
| 1909 | |
| 1910 | /* 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] | 1911 | if (snd_space < tc->snd_mss || tc->snd_mss == 0) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1912 | goto done; |
| 1913 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1914 | max_deq = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1915 | max_deq -= tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1916 | if (max_deq) |
| 1917 | { |
| 1918 | snd_space = clib_min (max_deq, snd_space); |
| 1919 | burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1920 | n_segs_now = tcp_transmit_unsent (wrk, tc, burst_size); |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1921 | if (n_segs_now && max_deq > n_segs_now * tc->snd_mss) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1922 | tcp_program_retransmit (tc); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1923 | n_segs += n_segs_now; |
| 1924 | } |
| 1925 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1926 | done: |
| 1927 | tcp_fastrecovery_first_off (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1928 | |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1929 | sent_bytes = clib_min (n_segs * tc->snd_mss, burst_bytes); |
| 1930 | sent_bytes = cc_limited ? burst_bytes : sent_bytes; |
| 1931 | transport_connection_tx_pacer_update_bytes (&tc->connection, sent_bytes); |
| 1932 | |
| 1933 | return n_segs; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1934 | } |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1935 | |
| 1936 | static int |
| 1937 | tcp_send_acks (tcp_connection_t * tc, u32 max_burst_size) |
| 1938 | { |
| 1939 | int j, n_acks; |
| 1940 | |
| 1941 | if (!tc->pending_dupacks) |
| 1942 | { |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1943 | if (tcp_in_cong_recovery (tc) || !tcp_max_tx_deq (tc) |
| 1944 | || tc->state != TCP_STATE_ESTABLISHED) |
| 1945 | { |
| 1946 | tcp_send_ack (tc); |
| 1947 | return 1; |
| 1948 | } |
| 1949 | return 0; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1950 | } |
| 1951 | |
| 1952 | /* If we're supposed to send dupacks but have no ooo data |
| 1953 | * send only one ack */ |
| 1954 | if (!vec_len (tc->snd_sacks)) |
| 1955 | { |
| 1956 | tcp_send_ack (tc); |
Florin Coras | 7fd59cc | 2020-03-12 15:50:57 +0000 | [diff] [blame] | 1957 | tc->dupacks_out += 1; |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1958 | tc->pending_dupacks = 0; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1959 | return 1; |
| 1960 | } |
| 1961 | |
| 1962 | /* Start with first sack block */ |
| 1963 | tc->snd_sack_pos = 0; |
| 1964 | |
| 1965 | /* Generate enough dupacks to cover all sack blocks. Do not generate |
| 1966 | * more sacks than the number of packets received. But do generate at |
| 1967 | * least 3, i.e., the number needed to signal congestion, if needed. */ |
| 1968 | n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS; |
| 1969 | n_acks = clib_min (n_acks, tc->pending_dupacks); |
| 1970 | n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3)); |
| 1971 | for (j = 0; j < clib_min (n_acks, max_burst_size); j++) |
| 1972 | tcp_send_ack (tc); |
| 1973 | |
| 1974 | if (n_acks < max_burst_size) |
| 1975 | { |
| 1976 | tc->pending_dupacks = 0; |
| 1977 | tc->snd_sack_pos = 0; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1978 | tc->dupacks_out += n_acks; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1979 | return n_acks; |
| 1980 | } |
| 1981 | else |
| 1982 | { |
| 1983 | TCP_DBG ("constrained by burst size"); |
| 1984 | tc->pending_dupacks = n_acks - max_burst_size; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1985 | tc->dupacks_out += max_burst_size; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1986 | tcp_program_dupack (tc); |
| 1987 | return max_burst_size; |
| 1988 | } |
| 1989 | } |
| 1990 | |
| 1991 | static int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1992 | tcp_do_retransmit (tcp_connection_t * tc, u32 max_burst_size) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1993 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1994 | tcp_worker_ctx_t *wrk; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1995 | u32 n_segs; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1996 | |
Florin Coras | fd4c3fe | 2019-11-07 12:33:12 -0800 | [diff] [blame] | 1997 | if (PREDICT_FALSE (tc->state == TCP_STATE_CLOSED)) |
| 1998 | return 0; |
| 1999 | |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2000 | wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2001 | |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2002 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
| 2003 | n_segs = tcp_retransmit_sack (wrk, tc, max_burst_size); |
| 2004 | else |
| 2005 | n_segs = tcp_retransmit_no_sack (wrk, tc, max_burst_size); |
| 2006 | |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2007 | return n_segs; |
| 2008 | } |
| 2009 | |
| 2010 | int |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2011 | tcp_session_custom_tx (void *conn, transport_send_params_t * sp) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2012 | { |
| 2013 | tcp_connection_t *tc = (tcp_connection_t *) conn; |
| 2014 | u32 n_segs = 0; |
| 2015 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2016 | if (tcp_in_cong_recovery (tc) && (tc->flags & TCP_CONN_RXT_PENDING)) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2017 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2018 | tc->flags &= ~TCP_CONN_RXT_PENDING; |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2019 | n_segs = tcp_do_retransmit (tc, sp->max_burst_size); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2020 | } |
| 2021 | |
| 2022 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 2023 | return n_segs; |
| 2024 | |
| 2025 | tc->flags &= ~TCP_CONN_SNDACK; |
| 2026 | |
| 2027 | /* We have retransmitted packets and no dupack */ |
| 2028 | if (n_segs && !tc->pending_dupacks) |
| 2029 | return n_segs; |
| 2030 | |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2031 | if (sp->max_burst_size <= n_segs) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2032 | { |
| 2033 | tcp_program_ack (tc); |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2034 | return n_segs; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2035 | } |
| 2036 | |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2037 | n_segs += tcp_send_acks (tc, sp->max_burst_size - n_segs); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2038 | |
| 2039 | return n_segs; |
| 2040 | } |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2041 | #endif /* CLIB_MARCH_VARIANT */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2042 | |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2043 | static void |
| 2044 | 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] | 2045 | u16 * next0, u32 * error0) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2046 | { |
| 2047 | ip_adjacency_t *adj; |
| 2048 | adj_index_t ai; |
| 2049 | |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2050 | /* Not thread safe but as long as the connection exists the adj should |
| 2051 | * not be removed */ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2052 | ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip, |
| 2053 | tc0->sw_if_index); |
| 2054 | if (ai == ADJ_INDEX_INVALID) |
| 2055 | { |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2056 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
| 2057 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2058 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 2059 | return; |
| 2060 | } |
| 2061 | |
| 2062 | adj = adj_get (ai); |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2063 | if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2064 | *next0 = TCP_OUTPUT_NEXT_IP_REWRITE; |
| 2065 | else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP) |
| 2066 | *next0 = TCP_OUTPUT_NEXT_IP_ARP; |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2067 | else |
| 2068 | { |
| 2069 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2070 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 2071 | } |
| 2072 | vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai; |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2073 | } |
| 2074 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2075 | static void |
| 2076 | tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2077 | u32 * to_next, u32 n_bufs) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2078 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2079 | tcp_connection_t *tc; |
| 2080 | tcp_tx_trace_t *t; |
| 2081 | vlib_buffer_t *b; |
| 2082 | tcp_header_t *th; |
| 2083 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2084 | |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 2085 | for (i = 0; i < n_bufs; i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2086 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2087 | b = vlib_get_buffer (vm, to_next[i]); |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 2088 | if (!(b->flags & VLIB_BUFFER_IS_TRACED)) |
| 2089 | continue; |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2090 | th = vlib_buffer_get_current (b); |
| 2091 | tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, |
| 2092 | vm->thread_index); |
| 2093 | t = vlib_add_trace (vm, node, b, sizeof (*t)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2094 | clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header)); |
| 2095 | clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2096 | } |
| 2097 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2098 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2099 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2100 | tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0, |
| 2101 | tcp_connection_t * tc0, u8 is_ip4) |
| 2102 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2103 | TCP_EVT (TCP_EVT_OUTPUT, tc0, |
| 2104 | ((tcp_header_t *) vlib_buffer_get_current (b0))->flags, |
| 2105 | b0->current_length); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 2106 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2107 | if (is_ip4) |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2108 | vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4, |
| 2109 | IP_PROTOCOL_TCP, tcp_csum_offload (tc0)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2110 | else |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2111 | vlib_buffer_push_ip6_custom (vm, b0, &tc0->c_lcl_ip6, &tc0->c_rmt_ip6, |
| 2112 | IP_PROTOCOL_TCP, tc0->ipv6_flow_label); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2113 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2114 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2115 | always_inline void |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2116 | tcp_check_if_gso (tcp_connection_t * tc, vlib_buffer_t * b) |
| 2117 | { |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 2118 | if (PREDICT_TRUE (!(tc->cfg_flags & TCP_CFG_F_TSO))) |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2119 | return; |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 2120 | |
Simon Zhang | 8a047ed | 2019-09-24 21:16:56 +0800 | [diff] [blame] | 2121 | u16 data_len = b->current_length - sizeof (tcp_header_t) - tc->snd_opts_len; |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2122 | |
Simon Zhang | 8a047ed | 2019-09-24 21:16:56 +0800 | [diff] [blame] | 2123 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)) |
| 2124 | data_len += b->total_length_not_including_first_buffer; |
| 2125 | |
| 2126 | if (PREDICT_TRUE (data_len <= tc->snd_mss)) |
| 2127 | return; |
| 2128 | else |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2129 | { |
| 2130 | ASSERT ((b->flags & VNET_BUFFER_F_L3_HDR_OFFSET_VALID) != 0); |
| 2131 | ASSERT ((b->flags & VNET_BUFFER_F_L4_HDR_OFFSET_VALID) != 0); |
| 2132 | b->flags |= VNET_BUFFER_F_GSO; |
| 2133 | vnet_buffer2 (b)->gso_l4_hdr_sz = |
| 2134 | sizeof (tcp_header_t) + tc->snd_opts_len; |
| 2135 | vnet_buffer2 (b)->gso_size = tc->snd_mss; |
| 2136 | } |
| 2137 | } |
| 2138 | |
| 2139 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2140 | tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0, |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2141 | vlib_node_runtime_t * error_node, u16 * next0, |
| 2142 | u8 is_ip4) |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2143 | { |
Florin Coras | 540a8da | 2019-06-18 08:55:14 -0700 | [diff] [blame] | 2144 | /* If next_index is not drop use it */ |
Florin Coras | 07beade | 2019-06-20 12:18:31 -0700 | [diff] [blame] | 2145 | if (tc0->next_node_index) |
| 2146 | { |
| 2147 | *next0 = tc0->next_node_index; |
| 2148 | vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque; |
| 2149 | } |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2150 | else |
| 2151 | { |
| 2152 | *next0 = TCP_OUTPUT_NEXT_IP_LOOKUP; |
| 2153 | } |
Florin Coras | 540a8da | 2019-06-18 08:55:14 -0700 | [diff] [blame] | 2154 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2155 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index; |
| 2156 | vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; |
| 2157 | |
| 2158 | if (!is_ip4) |
| 2159 | { |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2160 | u32 error0 = 0; |
| 2161 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2162 | if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6))) |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2163 | tcp_output_handle_link_local (tc0, b0, next0, &error0); |
| 2164 | |
| 2165 | if (PREDICT_FALSE (error0)) |
| 2166 | { |
| 2167 | b0->error = error_node->errors[error0]; |
| 2168 | return; |
| 2169 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2170 | } |
| 2171 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 2172 | tc0->segs_out += 1; |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2173 | } |
| 2174 | |
| 2175 | always_inline uword |
| 2176 | tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2177 | vlib_frame_t * frame, int is_ip4) |
| 2178 | { |
| 2179 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 2180 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 2181 | u16 nexts[VLIB_FRAME_SIZE], *next; |
| 2182 | |
| 2183 | from = vlib_frame_vector_args (frame); |
| 2184 | n_left_from = frame->n_vectors; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 2185 | tcp_set_time_now (tcp_get_worker (thread_index)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2186 | |
| 2187 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 2188 | tcp46_output_trace_frame (vm, node, from, n_left_from); |
| 2189 | |
| 2190 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2191 | b = bufs; |
| 2192 | next = nexts; |
| 2193 | |
| 2194 | while (n_left_from >= 4) |
| 2195 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2196 | tcp_connection_t *tc0, *tc1; |
| 2197 | |
| 2198 | { |
| 2199 | vlib_prefetch_buffer_header (b[2], STORE); |
| 2200 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2201 | |
| 2202 | vlib_prefetch_buffer_header (b[3], STORE); |
| 2203 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2204 | } |
| 2205 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2206 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2207 | thread_index); |
| 2208 | tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index, |
| 2209 | thread_index); |
| 2210 | |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2211 | if (PREDICT_TRUE (!tc0 + !tc1 == 0)) |
| 2212 | { |
| 2213 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
| 2214 | tcp_output_push_ip (vm, b[1], tc1, is_ip4); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2215 | |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2216 | tcp_check_if_gso (tc0, b[0]); |
| 2217 | tcp_check_if_gso (tc1, b[1]); |
| 2218 | |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2219 | tcp_output_handle_packet (tc0, b[0], node, &next[0], is_ip4); |
| 2220 | tcp_output_handle_packet (tc1, b[1], node, &next[1], is_ip4); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2221 | } |
| 2222 | else |
| 2223 | { |
| 2224 | if (tc0 != 0) |
| 2225 | { |
| 2226 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2227 | tcp_check_if_gso (tc0, b[0]); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2228 | tcp_output_handle_packet (tc0, b[0], node, &next[0], is_ip4); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2229 | } |
| 2230 | else |
| 2231 | { |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2232 | b[0]->error = node->errors[TCP_ERROR_INVALID_CONNECTION]; |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2233 | next[0] = TCP_OUTPUT_NEXT_DROP; |
| 2234 | } |
| 2235 | if (tc1 != 0) |
| 2236 | { |
| 2237 | tcp_output_push_ip (vm, b[1], tc1, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2238 | tcp_check_if_gso (tc1, b[1]); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2239 | tcp_output_handle_packet (tc1, b[1], node, &next[1], is_ip4); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2240 | } |
| 2241 | else |
| 2242 | { |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2243 | b[1]->error = node->errors[TCP_ERROR_INVALID_CONNECTION]; |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2244 | next[1] = TCP_OUTPUT_NEXT_DROP; |
| 2245 | } |
| 2246 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2247 | |
| 2248 | b += 2; |
| 2249 | next += 2; |
| 2250 | n_left_from -= 2; |
| 2251 | } |
| 2252 | while (n_left_from > 0) |
| 2253 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2254 | tcp_connection_t *tc0; |
| 2255 | |
| 2256 | if (n_left_from > 1) |
| 2257 | { |
Florin Coras | 91ca462 | 2018-06-30 11:27:59 -0700 | [diff] [blame] | 2258 | vlib_prefetch_buffer_header (b[1], STORE); |
| 2259 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2260 | } |
| 2261 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2262 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2263 | thread_index); |
| 2264 | |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2265 | if (PREDICT_TRUE (tc0 != 0)) |
| 2266 | { |
| 2267 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2268 | tcp_check_if_gso (tc0, b[0]); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2269 | tcp_output_handle_packet (tc0, b[0], node, &next[0], is_ip4); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2270 | } |
| 2271 | else |
| 2272 | { |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2273 | b[0]->error = node->errors[TCP_ERROR_INVALID_CONNECTION]; |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2274 | next[0] = TCP_OUTPUT_NEXT_DROP; |
| 2275 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2276 | |
| 2277 | b += 1; |
| 2278 | next += 1; |
| 2279 | n_left_from -= 1; |
| 2280 | } |
| 2281 | |
| 2282 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2283 | vlib_node_increment_counter (vm, tcp_node_index (output, is_ip4), |
| 2284 | TCP_ERROR_PKTS_SENT, frame->n_vectors); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2285 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2286 | } |
| 2287 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2288 | VLIB_NODE_FN (tcp4_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2289 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2290 | { |
| 2291 | return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2292 | } |
| 2293 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2294 | VLIB_NODE_FN (tcp6_output_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_output_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2298 | } |
| 2299 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2300 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2301 | VLIB_REGISTER_NODE (tcp4_output_node) = |
| 2302 | { |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2303 | .name = "tcp4-output", |
| 2304 | /* Takes a vector of packets. */ |
| 2305 | .vector_size = sizeof (u32), |
| 2306 | .n_errors = TCP_N_ERROR, |
Dave Barach | 7fff3d2 | 2018-11-27 16:52:59 -0500 | [diff] [blame] | 2307 | .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2308 | .error_strings = tcp_error_strings, |
| 2309 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2310 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2311 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2312 | foreach_tcp4_output_next |
| 2313 | #undef _ |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2314 | }, |
| 2315 | .format_buffer = format_tcp_header, |
| 2316 | .format_trace = format_tcp_tx_trace, |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2317 | }; |
| 2318 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2319 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2320 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2321 | VLIB_REGISTER_NODE (tcp6_output_node) = |
| 2322 | { |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2323 | .name = "tcp6-output", |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2324 | /* Takes a vector of packets. */ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2325 | .vector_size = sizeof (u32), |
| 2326 | .n_errors = TCP_N_ERROR, |
Dave Barach | 7fff3d2 | 2018-11-27 16:52:59 -0500 | [diff] [blame] | 2327 | .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2328 | .error_strings = tcp_error_strings, |
| 2329 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2330 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2331 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2332 | foreach_tcp6_output_next |
| 2333 | #undef _ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2334 | }, |
| 2335 | .format_buffer = format_tcp_header, |
| 2336 | .format_trace = format_tcp_tx_trace, |
| 2337 | }; |
| 2338 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2339 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2340 | typedef enum _tcp_reset_next |
| 2341 | { |
| 2342 | TCP_RESET_NEXT_DROP, |
| 2343 | TCP_RESET_NEXT_IP_LOOKUP, |
| 2344 | TCP_RESET_N_NEXT |
| 2345 | } tcp_reset_next_t; |
| 2346 | |
| 2347 | #define foreach_tcp4_reset_next \ |
| 2348 | _(DROP, "error-drop") \ |
| 2349 | _(IP_LOOKUP, "ip4-lookup") |
| 2350 | |
| 2351 | #define foreach_tcp6_reset_next \ |
| 2352 | _(DROP, "error-drop") \ |
| 2353 | _(IP_LOOKUP, "ip6-lookup") |
| 2354 | |
| 2355 | static uword |
| 2356 | tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2357 | vlib_frame_t * from_frame, u8 is_ip4) |
| 2358 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 2359 | u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2360 | u32 n_left_from, next_index, *from, *to_next; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2361 | |
| 2362 | from = vlib_frame_vector_args (from_frame); |
| 2363 | n_left_from = from_frame->n_vectors; |
| 2364 | |
| 2365 | next_index = node->cached_next_index; |
| 2366 | |
| 2367 | while (n_left_from > 0) |
| 2368 | { |
| 2369 | u32 n_left_to_next; |
| 2370 | |
| 2371 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2372 | |
| 2373 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2374 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2375 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2376 | tcp_tx_trace_t *t0; |
| 2377 | tcp_header_t *th0; |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 2378 | u32 bi0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2379 | |
| 2380 | bi0 = from[0]; |
| 2381 | to_next[0] = bi0; |
| 2382 | from += 1; |
| 2383 | to_next += 1; |
| 2384 | n_left_from -= 1; |
| 2385 | n_left_to_next -= 1; |
| 2386 | |
| 2387 | b0 = vlib_get_buffer (vm, bi0); |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 2388 | tcp_make_reset_in_place (vm, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2389 | |
| 2390 | /* Prepare to send to IP lookup */ |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 2391 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2392 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2393 | b0->error = node->errors[error0]; |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 2394 | b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2395 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2396 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2397 | th0 = vlib_buffer_get_current (b0); |
| 2398 | if (is_ip4) |
| 2399 | th0 = ip4_next_header ((ip4_header_t *) th0); |
| 2400 | else |
| 2401 | th0 = ip6_next_header ((ip6_header_t *) th0); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2402 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2403 | clib_memcpy_fast (&t0->tcp_header, th0, |
| 2404 | sizeof (t0->tcp_header)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2405 | } |
| 2406 | |
| 2407 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2408 | n_left_to_next, bi0, next0); |
| 2409 | } |
| 2410 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2411 | } |
| 2412 | return from_frame->n_vectors; |
| 2413 | } |
| 2414 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2415 | VLIB_NODE_FN (tcp4_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2416 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2417 | { |
| 2418 | return tcp46_send_reset_inline (vm, node, from_frame, 1); |
| 2419 | } |
| 2420 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2421 | VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2422 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2423 | { |
| 2424 | return tcp46_send_reset_inline (vm, node, from_frame, 0); |
| 2425 | } |
| 2426 | |
| 2427 | /* *INDENT-OFF* */ |
| 2428 | VLIB_REGISTER_NODE (tcp4_reset_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2429 | .name = "tcp4-reset", |
| 2430 | .vector_size = sizeof (u32), |
| 2431 | .n_errors = TCP_N_ERROR, |
| 2432 | .error_strings = tcp_error_strings, |
| 2433 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2434 | .next_nodes = { |
| 2435 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2436 | foreach_tcp4_reset_next |
| 2437 | #undef _ |
| 2438 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2439 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2440 | }; |
| 2441 | /* *INDENT-ON* */ |
| 2442 | |
| 2443 | /* *INDENT-OFF* */ |
| 2444 | VLIB_REGISTER_NODE (tcp6_reset_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2445 | .name = "tcp6-reset", |
| 2446 | .vector_size = sizeof (u32), |
| 2447 | .n_errors = TCP_N_ERROR, |
| 2448 | .error_strings = tcp_error_strings, |
| 2449 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2450 | .next_nodes = { |
| 2451 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2452 | foreach_tcp6_reset_next |
| 2453 | #undef _ |
| 2454 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2455 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2456 | }; |
| 2457 | /* *INDENT-ON* */ |
| 2458 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2459 | /* |
| 2460 | * fd.io coding-style-patch-verification: ON |
| 2461 | * |
| 2462 | * Local Variables: |
| 2463 | * eval: (c-set-style "gnu") |
| 2464 | * End: |
| 2465 | */ |