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> |
Neale Ranns | e403113 | 2020-10-26 13:00:06 +0000 | [diff] [blame] | 19 | #include <vnet/ip/ip4_inlines.h> |
| 20 | #include <vnet/ip/ip6_inlines.h> |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 21 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 22 | typedef enum _tcp_output_next |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 23 | { |
| 24 | TCP_OUTPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 25 | TCP_OUTPUT_NEXT_IP_LOOKUP, |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 26 | TCP_OUTPUT_NEXT_IP_REWRITE, |
| 27 | TCP_OUTPUT_NEXT_IP_ARP, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 28 | TCP_OUTPUT_N_NEXT |
| 29 | } tcp_output_next_t; |
| 30 | |
| 31 | #define foreach_tcp4_output_next \ |
| 32 | _ (DROP, "error-drop") \ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 33 | _ (IP_LOOKUP, "ip4-lookup") \ |
| 34 | _ (IP_REWRITE, "ip4-rewrite") \ |
| 35 | _ (IP_ARP, "ip4-arp") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 36 | |
| 37 | #define foreach_tcp6_output_next \ |
| 38 | _ (DROP, "error-drop") \ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 39 | _ (IP_LOOKUP, "ip6-lookup") \ |
| 40 | _ (IP_REWRITE, "ip6-rewrite") \ |
| 41 | _ (IP_ARP, "ip6-discover-neighbor") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 42 | |
| 43 | static char *tcp_error_strings[] = { |
| 44 | #define tcp_error(n,s) s, |
| 45 | #include <vnet/tcp/tcp_error.def> |
| 46 | #undef tcp_error |
| 47 | }; |
| 48 | |
| 49 | typedef struct |
| 50 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 51 | tcp_header_t tcp_header; |
| 52 | tcp_connection_t tcp_connection; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 53 | } tcp_tx_trace_t; |
| 54 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 55 | static u8 * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 56 | format_tcp_tx_trace (u8 * s, va_list * args) |
| 57 | { |
| 58 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 59 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 60 | tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *); |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 61 | tcp_connection_t *tc = &t->tcp_connection; |
Christophe Fontaine | d3c008d | 2017-10-02 18:10:54 +0200 | [diff] [blame] | 62 | u32 indent = format_get_indent (s); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 63 | |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 64 | s = format (s, "%U state %U\n%U%U", format_tcp_connection_id, tc, |
| 65 | format_tcp_state, tc->state, format_white_space, indent, |
| 66 | format_tcp_header, &t->tcp_header, 128); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 67 | |
| 68 | return s; |
| 69 | } |
| 70 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 71 | #ifndef CLIB_MARCH_VARIANT |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 72 | static u8 |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 73 | tcp_window_compute_scale (u32 window) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 74 | { |
| 75 | u8 wnd_scale = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 76 | 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] | 77 | wnd_scale++; |
| 78 | return wnd_scale; |
| 79 | } |
| 80 | |
| 81 | /** |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 82 | * TCP's initial window |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 83 | */ |
| 84 | always_inline u32 |
| 85 | tcp_initial_wnd_unscaled (tcp_connection_t * tc) |
| 86 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 87 | /* RFC 6928 recommends the value lower. However at the time our connections |
| 88 | * are initialized, fifos may not be allocated. Therefore, advertise the |
| 89 | * smallest possible unscaled window size and update once fifos are |
| 90 | * assigned to the session. |
| 91 | */ |
| 92 | /* |
| 93 | tcp_update_rcv_mss (tc); |
| 94 | TCP_IW_N_SEGMENTS * tc->mss; |
| 95 | */ |
Florin Coras | 9094b5c | 2019-08-12 14:17:47 -0700 | [diff] [blame] | 96 | return tcp_cfg.min_rx_fifo; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 100 | * Compute initial window and scale factor. As per RFC1323, window field in |
| 101 | * SYN and SYN-ACK segments is never scaled. |
| 102 | */ |
| 103 | u32 |
| 104 | tcp_initial_window_to_advertise (tcp_connection_t * tc) |
| 105 | { |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 106 | /* Compute rcv wscale only if peer advertised support for it */ |
| 107 | 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] | 108 | tc->rcv_wscale = tcp_window_compute_scale (tcp_cfg.max_rx_fifo); |
Florin Coras | e80b591 | 2018-12-12 19:25:43 -0800 | [diff] [blame] | 109 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 110 | tc->rcv_wnd = tcp_initial_wnd_unscaled (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 111 | |
| 112 | return clib_min (tc->rcv_wnd, TCP_WND_MAX); |
| 113 | } |
| 114 | |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 115 | static inline void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 116 | tcp_update_rcv_wnd (tcp_connection_t * tc) |
| 117 | { |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 118 | u32 available_space, wnd; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 119 | i32 observed_wnd; |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 120 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 121 | /* |
| 122 | * Figure out how much space we have available |
| 123 | */ |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 124 | available_space = transport_max_rx_enqueue (&tc->connection); |
Ryujiro Shibuya | cc10856 | 2020-06-24 08:36:14 +0100 | [diff] [blame] | 125 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 126 | /* |
| 127 | * Use the above and what we know about what we've previously advertised |
| 128 | * to compute the new window |
| 129 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 130 | observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 131 | |
Florin Coras | c78d47b | 2020-07-06 08:06:54 -0700 | [diff] [blame] | 132 | /* Check if we are about to retract the window. Do the comparison before |
| 133 | * rounding to avoid errors. Per RFC7323 sec. 2.4 we could remove this */ |
Florin Coras | f20fd1a | 2019-03-28 13:21:19 -0700 | [diff] [blame] | 134 | if (PREDICT_FALSE ((i32) available_space < observed_wnd)) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 135 | { |
Florin Coras | c78d47b | 2020-07-06 08:06:54 -0700 | [diff] [blame] | 136 | wnd = round_down_pow2 (clib_max (observed_wnd, 0), 1 << tc->rcv_wscale); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 137 | TCP_EVT (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 138 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 139 | else |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 140 | { |
Florin Coras | c78d47b | 2020-07-06 08:06:54 -0700 | [diff] [blame] | 141 | /* Make sure we have a multiple of 1 << rcv_wscale. We round down to |
| 142 | * avoid advertising a window larger than what can be buffered */ |
| 143 | wnd = round_down_pow2 (available_space, 1 << tc->rcv_wscale); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 144 | } |
| 145 | |
Florin Coras | c78d47b | 2020-07-06 08:06:54 -0700 | [diff] [blame] | 146 | if (PREDICT_FALSE (wnd < tc->rcv_opts.mss)) |
| 147 | wnd = 0; |
| 148 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 149 | tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | /** |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 153 | * Compute and return window to advertise, scaled as per RFC1323 |
| 154 | */ |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 155 | static inline u32 |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 156 | tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state) |
| 157 | { |
| 158 | if (state < TCP_STATE_ESTABLISHED) |
| 159 | return tcp_initial_window_to_advertise (tc); |
| 160 | |
| 161 | tcp_update_rcv_wnd (tc); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 162 | return tc->rcv_wnd >> tc->rcv_wscale; |
| 163 | } |
| 164 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 165 | static int |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 166 | tcp_make_syn_options (tcp_connection_t * tc, tcp_options_t * opts) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 167 | { |
| 168 | u8 len = 0; |
| 169 | |
| 170 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 171 | opts->mss = tc->mss; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 172 | len += TCP_OPTION_LEN_MSS; |
| 173 | |
| 174 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 175 | opts->wscale = tc->rcv_wscale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 176 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 177 | |
| 178 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
Florin Coras | 8f10b90 | 2021-04-02 18:32:00 -0700 | [diff] [blame^] | 179 | opts->tsval = tcp_time_tstamp (tc->c_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 180 | opts->tsecr = 0; |
| 181 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 182 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 183 | if (TCP_USE_SACKS) |
| 184 | { |
| 185 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 186 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 187 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 188 | |
| 189 | /* Align to needed boundary */ |
| 190 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 191 | return len; |
| 192 | } |
| 193 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 194 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 195 | tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 196 | { |
| 197 | u8 len = 0; |
| 198 | |
| 199 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 200 | opts->mss = tc->mss; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 201 | len += TCP_OPTION_LEN_MSS; |
| 202 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 203 | if (tcp_opts_wscale (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 204 | { |
| 205 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
| 206 | opts->wscale = tc->rcv_wscale; |
| 207 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 208 | } |
| 209 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 210 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 211 | { |
| 212 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
Florin Coras | 8f10b90 | 2021-04-02 18:32:00 -0700 | [diff] [blame^] | 213 | opts->tsval = tcp_time_tstamp (tc->c_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 214 | opts->tsecr = tc->tsval_recent; |
| 215 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 216 | } |
| 217 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 218 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 219 | { |
| 220 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 221 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 222 | } |
| 223 | |
| 224 | /* Align to needed boundary */ |
| 225 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 226 | return len; |
| 227 | } |
| 228 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 229 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 230 | tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 231 | { |
| 232 | u8 len = 0; |
| 233 | |
| 234 | opts->flags = 0; |
| 235 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 236 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 237 | { |
| 238 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
Vladimir Kropylev | 1cfcb78 | 2019-07-02 11:25:26 +0300 | [diff] [blame] | 239 | opts->tsval = tcp_tstamp (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 240 | opts->tsecr = tc->tsval_recent; |
| 241 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 242 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 243 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 244 | { |
| 245 | if (vec_len (tc->snd_sacks)) |
| 246 | { |
| 247 | opts->flags |= TCP_OPTS_FLAG_SACK; |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 248 | if (tc->snd_sack_pos >= vec_len (tc->snd_sacks)) |
| 249 | tc->snd_sack_pos = 0; |
| 250 | opts->sacks = &tc->snd_sacks[tc->snd_sack_pos]; |
| 251 | opts->n_sack_blocks = vec_len (tc->snd_sacks) - tc->snd_sack_pos; |
| 252 | opts->n_sack_blocks = clib_min (opts->n_sack_blocks, |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 253 | TCP_OPTS_MAX_SACK_BLOCKS); |
Florin Coras | e5b1791 | 2019-02-21 16:46:24 -0800 | [diff] [blame] | 254 | tc->snd_sack_pos += opts->n_sack_blocks; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 255 | len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | /* Align to needed boundary */ |
| 260 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 261 | return len; |
| 262 | } |
| 263 | |
| 264 | always_inline int |
| 265 | tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts, |
| 266 | tcp_state_t state) |
| 267 | { |
| 268 | switch (state) |
| 269 | { |
| 270 | case TCP_STATE_ESTABLISHED: |
Florin Coras | 25579b4 | 2018-06-06 17:55:02 -0700 | [diff] [blame] | 271 | case TCP_STATE_CLOSE_WAIT: |
Florin Coras | 54ddf43 | 2018-12-21 13:54:09 -0800 | [diff] [blame] | 272 | case TCP_STATE_FIN_WAIT_1: |
| 273 | case TCP_STATE_LAST_ACK: |
| 274 | case TCP_STATE_CLOSING: |
| 275 | case TCP_STATE_FIN_WAIT_2: |
| 276 | case TCP_STATE_TIME_WAIT: |
| 277 | case TCP_STATE_CLOSED: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 278 | return tcp_make_established_options (tc, opts); |
| 279 | case TCP_STATE_SYN_RCVD: |
| 280 | return tcp_make_synack_options (tc, opts); |
| 281 | case TCP_STATE_SYN_SENT: |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 282 | return tcp_make_syn_options (tc, opts); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 283 | default: |
Florin Coras | 371ca50 | 2018-02-21 12:07:41 -0800 | [diff] [blame] | 284 | clib_warning ("State not handled! %d", state); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 285 | return 0; |
| 286 | } |
| 287 | } |
| 288 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 289 | /** |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 290 | * Update burst send vars |
| 291 | * |
| 292 | * - Updates snd_mss to reflect the effective segment size that we can send |
| 293 | * by taking into account all TCP options, including SACKs. |
| 294 | * - Cache 'on the wire' options for reuse |
| 295 | * - Updates receive window which can be reused for a burst. |
| 296 | * |
| 297 | * This should *only* be called when doing bursts |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 298 | */ |
| 299 | void |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 300 | tcp_update_burst_snd_vars (tcp_connection_t * tc) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 301 | { |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 302 | tcp_main_t *tm = &tcp_main; |
| 303 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 304 | /* Compute options to be used for connection. These may be reused when |
| 305 | * sending data or to compute the effective mss (snd_mss) */ |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 306 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, |
| 307 | TCP_STATE_ESTABLISHED); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 308 | |
| 309 | /* XXX check if MTU has been updated */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 310 | 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] | 311 | ASSERT (tc->snd_mss > 0); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 312 | |
| 313 | tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 314 | &tc->snd_opts); |
| 315 | |
| 316 | tcp_update_rcv_wnd (tc); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 317 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 318 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 319 | tcp_bt_check_app_limited (tc); |
Florin Coras | ca2831a | 2019-07-04 17:05:59 -0700 | [diff] [blame] | 320 | |
| 321 | if (tc->snd_una == tc->snd_nxt) |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 322 | { |
| 323 | tcp_cc_event (tc, TCP_CC_EVT_START_TX); |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 324 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, TRANSPORT_PACER_MIN_BURST); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 325 | } |
Florin Coras | fb9d374 | 2020-11-05 19:01:44 -0800 | [diff] [blame] | 326 | |
| 327 | if (tc->flags & TCP_CONN_PSH_PENDING) |
| 328 | { |
| 329 | u32 max_deq = transport_max_tx_dequeue (&tc->connection); |
| 330 | /* Last byte marked for push */ |
| 331 | tc->psh_seq = tc->snd_una + max_deq - 1; |
| 332 | } |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 333 | } |
| 334 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 335 | #endif /* CLIB_MARCH_VARIANT */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 336 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 337 | static void * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 338 | tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 339 | { |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 340 | if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| 341 | vlib_buffer_free_one (vm, b->next_buffer); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 342 | /* Zero all flags but free list index and trace flag */ |
| 343 | b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 344 | b->current_data = 0; |
| 345 | b->current_length = 0; |
| 346 | b->total_length_not_including_first_buffer = 0; |
| 347 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 348 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 349 | /* Leave enough space for headers */ |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 350 | return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 351 | } |
| 352 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 353 | #ifndef CLIB_MARCH_VARIANT |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 354 | static void * |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 355 | tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 356 | { |
| 357 | ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 358 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 359 | b->total_length_not_including_first_buffer = 0; |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 360 | b->current_data = 0; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 361 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 362 | VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 363 | /* Leave enough space for headers */ |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 364 | return vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 365 | } |
| 366 | |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 367 | |
| 368 | /* Compute TCP checksum in software when offloading is disabled for a connection */ |
| 369 | u16 |
| 370 | ip6_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0, |
| 371 | ip46_address_t * src, ip46_address_t * dst) |
| 372 | { |
| 373 | ip_csum_t sum0; |
| 374 | u16 payload_length_host_byte_order; |
| 375 | u32 i; |
| 376 | |
| 377 | /* Initialize checksum with ip header. */ |
| 378 | sum0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, p0)) + |
| 379 | clib_host_to_net_u16 (IP_PROTOCOL_TCP); |
| 380 | payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0); |
| 381 | |
| 382 | for (i = 0; i < ARRAY_LEN (src->ip6.as_uword); i++) |
| 383 | { |
| 384 | sum0 = ip_csum_with_carry |
| 385 | (sum0, clib_mem_unaligned (&src->ip6.as_uword[i], uword)); |
| 386 | sum0 = ip_csum_with_carry |
| 387 | (sum0, clib_mem_unaligned (&dst->ip6.as_uword[i], uword)); |
| 388 | } |
| 389 | |
| 390 | return ip_calculate_l4_checksum (vm, p0, sum0, |
| 391 | payload_length_host_byte_order, NULL, 0, |
| 392 | NULL); |
| 393 | } |
| 394 | |
| 395 | u16 |
| 396 | ip4_tcp_compute_checksum_custom (vlib_main_t * vm, vlib_buffer_t * p0, |
| 397 | ip46_address_t * src, ip46_address_t * dst) |
| 398 | { |
| 399 | ip_csum_t sum0; |
| 400 | u32 payload_length_host_byte_order; |
| 401 | |
| 402 | payload_length_host_byte_order = vlib_buffer_length_in_chain (vm, p0); |
| 403 | sum0 = |
| 404 | clib_host_to_net_u32 (payload_length_host_byte_order + |
| 405 | (IP_PROTOCOL_TCP << 16)); |
| 406 | |
| 407 | sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&src->ip4, u32)); |
| 408 | sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&dst->ip4, u32)); |
| 409 | |
| 410 | return ip_calculate_l4_checksum (vm, p0, sum0, |
| 411 | payload_length_host_byte_order, NULL, 0, |
| 412 | NULL); |
| 413 | } |
| 414 | |
| 415 | static inline u16 |
| 416 | tcp_compute_checksum (tcp_connection_t * tc, vlib_buffer_t * b) |
| 417 | { |
| 418 | u16 checksum = 0; |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 419 | if (PREDICT_FALSE (tc->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD)) |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 420 | { |
| 421 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 422 | vlib_main_t *vm = wrk->vm; |
| 423 | |
| 424 | if (tc->c_is_ip4) |
| 425 | checksum = ip4_tcp_compute_checksum_custom |
| 426 | (vm, b, &tc->c_lcl_ip, &tc->c_rmt_ip); |
| 427 | else |
| 428 | checksum = ip6_tcp_compute_checksum_custom |
| 429 | (vm, b, &tc->c_lcl_ip, &tc->c_rmt_ip); |
| 430 | } |
| 431 | else |
| 432 | { |
Mohsin Kazmi | 6809538 | 2021-02-10 11:26:24 +0100 | [diff] [blame] | 433 | vnet_buffer_offload_flags_set (b, VNET_BUFFER_OFFLOAD_F_TCP_CKSUM); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 434 | } |
| 435 | return checksum; |
| 436 | } |
| 437 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 438 | /** |
| 439 | * Prepare ACK |
| 440 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 441 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 442 | tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state, |
| 443 | u8 flags) |
| 444 | { |
| 445 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 446 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 447 | tcp_header_t *th; |
| 448 | u16 wnd; |
| 449 | |
| 450 | wnd = tcp_window_to_advertise (tc, state); |
| 451 | |
| 452 | /* Make and write options */ |
| 453 | tcp_opts_len = tcp_make_established_options (tc, snd_opts); |
| 454 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 455 | |
| 456 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 457 | tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd); |
| 458 | |
| 459 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 460 | |
| 461 | th->checksum = tcp_compute_checksum (tc, b); |
| 462 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 463 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 464 | |
| 465 | if (wnd == 0) |
| 466 | tcp_zero_rwnd_sent_on (tc); |
| 467 | else |
| 468 | tcp_zero_rwnd_sent_off (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | /** |
| 472 | * Convert buffer to ACK |
| 473 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 474 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 475 | tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 476 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 477 | tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 478 | TCP_EVT (TCP_EVT_ACK_SENT, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 479 | tc->rcv_las = tc->rcv_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | /** |
| 483 | * Convert buffer to FIN-ACK |
| 484 | */ |
Florin Coras | 999840c | 2020-03-18 20:31:34 +0000 | [diff] [blame] | 485 | static void |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 486 | tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 487 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 488 | 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] | 489 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 490 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 491 | /** |
| 492 | * Convert buffer to SYN |
| 493 | */ |
| 494 | void |
| 495 | tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b) |
| 496 | { |
| 497 | u8 tcp_hdr_opts_len, tcp_opts_len; |
| 498 | tcp_header_t *th; |
| 499 | u16 initial_wnd; |
| 500 | tcp_options_t snd_opts; |
| 501 | |
| 502 | initial_wnd = tcp_initial_window_to_advertise (tc); |
| 503 | |
| 504 | /* Make and write options */ |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 505 | clib_memset (&snd_opts, 0, sizeof (snd_opts)); |
Florin Coras | cedcf60 | 2019-08-27 12:15:43 -0700 | [diff] [blame] | 506 | tcp_opts_len = tcp_make_syn_options (tc, &snd_opts); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 507 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 508 | |
| 509 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 510 | tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN, |
| 511 | initial_wnd); |
| 512 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
| 513 | tcp_options_write ((u8 *) (th + 1), &snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 514 | th->checksum = tcp_compute_checksum (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | /** |
| 518 | * Convert buffer to SYN-ACK |
| 519 | */ |
Florin Coras | 999840c | 2020-03-18 20:31:34 +0000 | [diff] [blame] | 520 | static void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 521 | tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 522 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 523 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 524 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 525 | tcp_header_t *th; |
| 526 | u16 initial_wnd; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 527 | |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 528 | clib_memset (snd_opts, 0, sizeof (*snd_opts)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 529 | initial_wnd = tcp_initial_window_to_advertise (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 530 | tcp_opts_len = tcp_make_synack_options (tc, snd_opts); |
| 531 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 532 | |
| 533 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 534 | tc->rcv_nxt, tcp_hdr_opts_len, |
| 535 | TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 536 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
| 537 | |
| 538 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 539 | th->checksum = tcp_compute_checksum (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 540 | } |
| 541 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 542 | static void |
| 543 | tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
| 544 | u8 is_ip4, u32 fib_index) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 545 | { |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 546 | tcp_main_t *tm = &tcp_main; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 547 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 548 | |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 549 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 550 | b->error = 0; |
| 551 | |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 552 | vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index; |
| 553 | vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 554 | |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 555 | tcp_trajectory_add_start (b, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 556 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 557 | session_add_pending_tx_buffer (vm->thread_index, bi, |
| 558 | tm->ipl_next_node[!is_ip4]); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 559 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 560 | if (vm->thread_index == 0 && vlib_num_workers ()) |
| 561 | session_queue_run_on_main_thread (wrk->vm); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 562 | } |
| 563 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 564 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 565 | tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
| 566 | u8 is_ip4) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 567 | { |
Florin Coras | 2a7ea2e | 2019-10-16 22:06:08 -0700 | [diff] [blame] | 568 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
| 569 | b->error = 0; |
| 570 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 571 | session_add_pending_tx_buffer (wrk->vm->thread_index, bi, |
| 572 | wrk->tco_next_node[!is_ip4]); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 573 | } |
| 574 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 575 | #endif /* CLIB_MARCH_VARIANT */ |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 576 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 577 | static int |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 578 | 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] | 579 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 580 | ip4_header_t *ih4; |
| 581 | ip6_header_t *ih6; |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 582 | tcp_header_t *th; |
| 583 | ip4_address_t src_ip4, dst_ip4; |
| 584 | ip6_address_t src_ip6, dst_ip6; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 585 | u16 src_port, dst_port; |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 586 | u32 tmp, len, seq, ack; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 587 | u8 flags; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 588 | |
| 589 | /* Find IP and TCP headers */ |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 590 | th = tcp_buffer_hdr (b); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 591 | |
| 592 | /* Save src and dst ip */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 593 | if (is_ip4) |
| 594 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 595 | ih4 = vlib_buffer_get_current (b); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 596 | ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40); |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 597 | src_ip4.as_u32 = ih4->src_address.as_u32; |
| 598 | dst_ip4.as_u32 = ih4->dst_address.as_u32; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 599 | } |
| 600 | else |
| 601 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 602 | ih6 = vlib_buffer_get_current (b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 603 | ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60); |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 604 | clib_memcpy_fast (&src_ip6, &ih6->src_address, sizeof (ip6_address_t)); |
| 605 | clib_memcpy_fast (&dst_ip6, &ih6->dst_address, sizeof (ip6_address_t)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 606 | } |
| 607 | |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 608 | src_port = th->src_port; |
| 609 | dst_port = th->dst_port; |
| 610 | flags = TCP_FLAG_RST; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 611 | |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 612 | /* |
| 613 | * RFC 793. If the ACK bit is off, sequence number zero is used, |
| 614 | * <SEQ=0><ACK=SEG.SEQ+SEG.LEN><CTL=RST,ACK> |
| 615 | * If the ACK bit is on, |
| 616 | * <SEQ=SEG.ACK><CTL=RST> |
| 617 | */ |
| 618 | if (tcp_ack (th)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 619 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 620 | seq = th->ack_number; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 621 | ack = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 622 | } |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 623 | else |
| 624 | { |
| 625 | flags |= TCP_FLAG_ACK; |
| 626 | tmp = clib_net_to_host_u32 (th->seq_number); |
| 627 | len = vnet_buffer (b)->tcp.data_len + tcp_is_syn (th) + tcp_is_fin (th); |
| 628 | ack = clib_host_to_net_u32 (tmp + len); |
| 629 | seq = 0; |
| 630 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 631 | |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 632 | tcp_reuse_buffer (vm, b); |
| 633 | tcp_trajectory_add_start (b, 4); |
| 634 | th = vlib_buffer_push_tcp_net_order (b, dst_port, src_port, seq, ack, |
| 635 | sizeof (tcp_header_t), flags, 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 636 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 637 | if (is_ip4) |
| 638 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 639 | ih4 = vlib_buffer_push_ip4 (vm, b, &dst_ip4, &src_ip4, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 640 | IP_PROTOCOL_TCP, 1); |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 641 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 642 | } |
| 643 | else |
| 644 | { |
| 645 | int bogus = ~0; |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 646 | ih6 = vlib_buffer_push_ip6 (vm, b, &dst_ip6, &src_ip6, IP_PROTOCOL_TCP); |
| 647 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 648 | ASSERT (!bogus); |
| 649 | } |
| 650 | |
| 651 | return 0; |
| 652 | } |
| 653 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 654 | #ifndef CLIB_MARCH_VARIANT |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 655 | /** |
| 656 | * Send reset without reusing existing buffer |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 657 | * |
| 658 | * It extracts connection info out of original packet |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 659 | */ |
| 660 | void |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 661 | tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, |
| 662 | u32 thread_index, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 663 | { |
Florin Coras | d4c49be | 2019-02-07 00:15:53 -0800 | [diff] [blame] | 664 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 665 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 666 | vlib_buffer_t *b; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 667 | u32 bi, sw_if_index, fib_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 668 | u8 tcp_hdr_len, flags = 0; |
| 669 | tcp_header_t *th, *pkt_th; |
| 670 | u32 seq, ack; |
| 671 | ip4_header_t *ih4, *pkt_ih4; |
| 672 | ip6_header_t *ih6, *pkt_ih6; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 673 | fib_protocol_t fib_proto; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 674 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 675 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 676 | { |
| 677 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
| 678 | return; |
| 679 | } |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 680 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 681 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 682 | sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX]; |
| 683 | fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; |
| 684 | 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] | 685 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 686 | |
| 687 | /* Make and write options */ |
| 688 | tcp_hdr_len = sizeof (tcp_header_t); |
| 689 | |
| 690 | if (is_ip4) |
| 691 | { |
| 692 | pkt_ih4 = vlib_buffer_get_current (pkt); |
| 693 | pkt_th = ip4_next_header (pkt_ih4); |
| 694 | } |
| 695 | else |
| 696 | { |
| 697 | pkt_ih6 = vlib_buffer_get_current (pkt); |
| 698 | pkt_th = ip6_next_header (pkt_ih6); |
| 699 | } |
| 700 | |
| 701 | if (tcp_ack (pkt_th)) |
| 702 | { |
| 703 | flags = TCP_FLAG_RST; |
| 704 | seq = pkt_th->ack_number; |
Florin Coras | 776f3d8 | 2018-11-02 08:23:58 -0700 | [diff] [blame] | 705 | ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 706 | } |
| 707 | else |
| 708 | { |
| 709 | flags = TCP_FLAG_RST | TCP_FLAG_ACK; |
| 710 | seq = 0; |
| 711 | ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end); |
| 712 | } |
| 713 | |
| 714 | th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port, |
| 715 | seq, ack, tcp_hdr_len, flags, 0); |
| 716 | |
| 717 | /* Swap src and dst ip */ |
| 718 | if (is_ip4) |
| 719 | { |
| 720 | ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40); |
| 721 | ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address, |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 722 | &pkt_ih4->src_address, IP_PROTOCOL_TCP, |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 723 | tcp_csum_offload (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 724 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
| 725 | } |
| 726 | else |
| 727 | { |
| 728 | int bogus = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 729 | ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) == |
| 730 | 0x60); |
Tarun Gupta | 2089c69 | 2019-11-04 16:35:59 -0800 | [diff] [blame] | 731 | ih6 = vlib_buffer_push_ip6_custom (vm, b, &pkt_ih6->dst_address, |
| 732 | &pkt_ih6->src_address, |
| 733 | IP_PROTOCOL_TCP, |
| 734 | tc->ipv6_flow_label); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 735 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
| 736 | ASSERT (!bogus); |
| 737 | } |
| 738 | |
Florin Coras | 5484daa | 2020-03-27 23:55:06 +0000 | [diff] [blame] | 739 | tcp_enqueue_to_ip_lookup (wrk, b, bi, is_ip4, fib_index); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 740 | TCP_EVT (TCP_EVT_RST_SENT, tc); |
Florin Coras | 1f42101 | 2019-07-26 10:18:51 -0700 | [diff] [blame] | 741 | vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4), |
| 742 | TCP_ERROR_RST_SENT, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 743 | } |
| 744 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 745 | /** |
| 746 | * Build and set reset packet for connection |
| 747 | */ |
| 748 | void |
| 749 | tcp_send_reset (tcp_connection_t * tc) |
| 750 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 751 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 752 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 753 | vlib_buffer_t *b; |
| 754 | u32 bi; |
| 755 | tcp_header_t *th; |
| 756 | u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len; |
| 757 | u8 flags; |
| 758 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 759 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 760 | { |
| 761 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
| 762 | return; |
| 763 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 764 | b = vlib_get_buffer (vm, bi); |
| 765 | tcp_init_buffer (vm, b); |
| 766 | |
| 767 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 768 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
Florin Coras | 4e783b9 | 2020-03-23 23:24:19 +0000 | [diff] [blame] | 769 | advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 770 | flags = TCP_FLAG_RST; |
| 771 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 772 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 773 | advertise_wnd); |
| 774 | opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 775 | th->checksum = tcp_compute_checksum (tc, b); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 776 | ASSERT (opts_write_len == tc->snd_opts_len); |
| 777 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 778 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 779 | TCP_EVT (TCP_EVT_RST_SENT, tc); |
Florin Coras | 1f42101 | 2019-07-26 10:18:51 -0700 | [diff] [blame] | 780 | vlib_node_increment_counter (vm, tcp_node_index (output, tc->c_is_ip4), |
| 781 | TCP_ERROR_RST_SENT, 1); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 782 | } |
| 783 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 784 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 785 | tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 786 | vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 787 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 788 | if (tc->c_is_ip4) |
| 789 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 790 | vlib_buffer_push_ip4 (wrk->vm, b, &tc->c_lcl_ip4, &tc->c_rmt_ip4, |
| 791 | IP_PROTOCOL_TCP, tcp_csum_offload (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 792 | } |
| 793 | else |
| 794 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 795 | vlib_buffer_push_ip6_custom (wrk->vm, b, &tc->c_lcl_ip6, &tc->c_rmt_ip6, |
| 796 | IP_PROTOCOL_TCP, tc->ipv6_flow_label); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 797 | } |
| 798 | } |
| 799 | |
| 800 | /** |
| 801 | * Send SYN |
| 802 | * |
| 803 | * Builds a SYN packet for a half-open connection and sends it to ipx_lookup. |
| 804 | * The packet is not forwarded through tcpx_output to avoid doing lookups |
| 805 | * in the half_open pool. |
| 806 | */ |
| 807 | void |
| 808 | tcp_send_syn (tcp_connection_t * tc) |
| 809 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 810 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 811 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 812 | vlib_buffer_t *b; |
| 813 | u32 bi; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 814 | |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 815 | /* |
| 816 | * Setup retransmit and establish timers before requesting buffer |
| 817 | * such that we can return if we've ran out. |
| 818 | */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 819 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN, |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 820 | tc->rto * TCP_TO_TIMER_TICK); |
| 821 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 822 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 823 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 824 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN, 1); |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 825 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 826 | return; |
| 827 | } |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 828 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 829 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 830 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 831 | tcp_make_syn (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 832 | |
| 833 | /* Measure RTT with this */ |
Florin Coras | efefc6b | 2018-11-07 12:49:19 -0800 | [diff] [blame] | 834 | tc->rtt_ts = tcp_time_now_us (vlib_num_workers ()? 1 : 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 835 | tc->rtt_seq = tc->snd_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 836 | tc->rto_boff = 0; |
| 837 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 838 | tcp_push_ip_hdr (wrk, tc, b); |
| 839 | 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] | 840 | TCP_EVT (TCP_EVT_SYN_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 841 | } |
| 842 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 843 | void |
| 844 | tcp_send_synack (tcp_connection_t * tc) |
| 845 | { |
| 846 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 847 | vlib_main_t *vm = wrk->vm; |
| 848 | vlib_buffer_t *b; |
| 849 | u32 bi; |
| 850 | |
Florin Coras | eaec00c | 2020-10-22 11:22:22 -0700 | [diff] [blame] | 851 | ASSERT (tc->snd_una != tc->snd_nxt); |
| 852 | tcp_retransmit_timer_update (&wrk->timer_wheel, tc); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 853 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 854 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 855 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 856 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 857 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 858 | return; |
| 859 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 860 | |
Florin Coras | df08478 | 2018-12-06 17:41:10 -0800 | [diff] [blame] | 861 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 862 | b = vlib_get_buffer (vm, bi); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 863 | tcp_init_buffer (vm, b); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 864 | tcp_make_synack (tc, b); |
| 865 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 866 | TCP_EVT (TCP_EVT_SYNACK_SENT, tc); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 867 | } |
| 868 | |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 869 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 870 | * Send FIN |
| 871 | */ |
| 872 | void |
| 873 | tcp_send_fin (tcp_connection_t * tc) |
| 874 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 875 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 876 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 877 | vlib_buffer_t *b; |
| 878 | u32 bi; |
| 879 | u8 fin_snt = 0; |
| 880 | |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 881 | fin_snt = tc->flags & TCP_CONN_FINSNT; |
| 882 | if (fin_snt) |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 883 | tc->snd_nxt -= 1; |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 884 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 885 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 886 | { |
| 887 | /* Out of buffers so program fin retransmit ASAP */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 888 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 889 | if (fin_snt) |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 890 | tc->snd_nxt += 1; |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 891 | else |
| 892 | /* Make sure retransmit retries a fin not data */ |
| 893 | tc->flags |= TCP_CONN_FINSNT; |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 894 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 895 | return; |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 896 | } |
| 897 | |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 898 | /* If we have non-dupacks programmed, no need to send them */ |
| 899 | if ((tc->flags & TCP_CONN_SNDACK) && !tc->pending_dupacks) |
| 900 | tc->flags &= ~TCP_CONN_SNDACK; |
| 901 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 902 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 903 | tcp_init_buffer (vm, b); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 904 | tcp_make_fin (tc, b); |
Florin Coras | 2a7ea2e | 2019-10-16 22:06:08 -0700 | [diff] [blame] | 905 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 906 | TCP_EVT (TCP_EVT_FIN_SENT, tc); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 907 | /* Account for the FIN */ |
| 908 | tc->snd_nxt += 1; |
Florin Coras | eaec00c | 2020-10-22 11:22:22 -0700 | [diff] [blame] | 909 | tcp_retransmit_timer_update (&wrk->timer_wheel, tc); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 910 | if (!fin_snt) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 911 | { |
| 912 | tc->flags |= TCP_CONN_FINSNT; |
| 913 | tc->flags &= ~TCP_CONN_FINPNDG; |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 914 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 915 | } |
| 916 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 917 | /** |
Florin Coras | fd24744 | 2019-03-12 16:56:26 -0700 | [diff] [blame] | 918 | * Push TCP header and update connection variables. Should only be called |
| 919 | * for segments with data, not for 'control' packets. |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 920 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 921 | always_inline void |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 922 | tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, u32 snd_nxt, |
| 923 | u8 compute_opts, u8 maybe_burst, u8 update_snd_nxt) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 924 | { |
Florin Coras | fd24744 | 2019-03-12 16:56:26 -0700 | [diff] [blame] | 925 | u8 tcp_hdr_opts_len, flags = TCP_FLAG_ACK; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 926 | u32 advertise_wnd, data_len; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 927 | tcp_main_t *tm = &tcp_main; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 928 | tcp_header_t *th; |
| 929 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 930 | data_len = b->current_length; |
| 931 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 932 | data_len += b->total_length_not_including_first_buffer; |
| 933 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 934 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 935 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 936 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 937 | if (compute_opts) |
| 938 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 939 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 940 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 941 | |
| 942 | if (maybe_burst) |
| 943 | advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale; |
| 944 | else |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 945 | advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 946 | |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 947 | if (PREDICT_FALSE (tc->flags & TCP_CONN_PSH_PENDING)) |
| 948 | { |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 949 | if (seq_geq (tc->psh_seq, snd_nxt) |
| 950 | && seq_lt (tc->psh_seq, snd_nxt + data_len)) |
Florin Coras | 42ceddb | 2018-12-12 10:56:01 -0800 | [diff] [blame] | 951 | flags |= TCP_FLAG_PSH; |
| 952 | } |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 953 | 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] | 954 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 955 | advertise_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 956 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 957 | if (maybe_burst) |
| 958 | { |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 959 | clib_memcpy_fast ((u8 *) (th + 1), |
| 960 | tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 961 | tc->snd_opts_len); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 962 | } |
| 963 | else |
| 964 | { |
| 965 | u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
| 966 | ASSERT (len == tc->snd_opts_len); |
| 967 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 968 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 969 | /* |
| 970 | * Update connection variables |
| 971 | */ |
| 972 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 973 | if (update_snd_nxt) |
| 974 | tc->snd_nxt += data_len; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 975 | tc->rcv_las = tc->rcv_nxt; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 976 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 977 | tc->bytes_out += data_len; |
| 978 | tc->data_segs_out += 1; |
| 979 | |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 980 | th->checksum = tcp_compute_checksum (tc, b); |
| 981 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 982 | TCP_EVT (TCP_EVT_PKTIZE, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 983 | } |
| 984 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 985 | always_inline u32 |
| 986 | tcp_buffer_len (vlib_buffer_t * b) |
| 987 | { |
| 988 | u32 data_len = b->current_length; |
| 989 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 990 | data_len += b->total_length_not_including_first_buffer; |
| 991 | return data_len; |
| 992 | } |
| 993 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 994 | u32 |
Florin Coras | 14ed6df | 2019-03-06 21:13:42 -0800 | [diff] [blame] | 995 | tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b) |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 996 | { |
Florin Coras | 14ed6df | 2019-03-06 21:13:42 -0800 | [diff] [blame] | 997 | tcp_connection_t *tc = (tcp_connection_t *) tconn; |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 998 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 999 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 1000 | tcp_bt_track_tx (tc, tcp_buffer_len (b)); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 1001 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1002 | tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1, |
| 1003 | /* update_snd_nxt */ 1); |
Florin Coras | 5281473 | 2019-06-12 15:38:19 -0700 | [diff] [blame] | 1004 | |
Florin Coras | 55e556c | 2020-10-23 10:45:48 -0700 | [diff] [blame] | 1005 | tcp_validate_txf_size (tc, tc->snd_nxt - tc->snd_una); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1006 | /* If not tracking an ACK, start tracking */ |
| 1007 | if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc)) |
| 1008 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1009 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1010 | tc->rtt_seq = tc->snd_nxt; |
| 1011 | } |
| 1012 | if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))) |
| 1013 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1014 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1015 | tcp_retransmit_timer_set (&wrk->timer_wheel, tc); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1016 | tc->rto_boff = 0; |
| 1017 | } |
| 1018 | tcp_trajectory_add_start (b, 3); |
| 1019 | return 0; |
| 1020 | } |
| 1021 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1022 | void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1023 | tcp_send_ack (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1024 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1025 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1026 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1027 | vlib_buffer_t *b; |
| 1028 | u32 bi; |
| 1029 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1030 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1031 | { |
| 1032 | tcp_update_rcv_wnd (tc); |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 1033 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1034 | return; |
| 1035 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1036 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1037 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1038 | tcp_make_ack (tc, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1039 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1040 | } |
| 1041 | |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1042 | void |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1043 | tcp_program_ack (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1044 | { |
| 1045 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 1046 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1047 | session_add_self_custom_tx_evt (&tc->connection, 1); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1048 | tc->flags |= TCP_CONN_SNDACK; |
| 1049 | } |
| 1050 | } |
| 1051 | |
| 1052 | void |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1053 | tcp_program_dupack (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1054 | { |
| 1055 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 1056 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1057 | session_add_self_custom_tx_evt (&tc->connection, 1); |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1058 | tc->flags |= TCP_CONN_SNDACK; |
| 1059 | } |
| 1060 | if (tc->pending_dupacks < 255) |
| 1061 | tc->pending_dupacks += 1; |
| 1062 | } |
| 1063 | |
| 1064 | void |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1065 | tcp_program_retransmit (tcp_connection_t * tc) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1066 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1067 | if (!(tc->flags & TCP_CONN_RXT_PENDING)) |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1068 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1069 | session_add_self_custom_tx_evt (&tc->connection, 0); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1070 | tc->flags |= TCP_CONN_RXT_PENDING; |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1071 | } |
Florin Coras | 7ac053b | 2018-11-05 15:57:21 -0800 | [diff] [blame] | 1072 | } |
| 1073 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1074 | /** |
Florin Coras | 017dc45 | 2019-08-30 11:06:35 -0700 | [diff] [blame] | 1075 | * Send window update ack |
| 1076 | * |
| 1077 | * Ensures that it will be sent only once, after a zero rwnd has been |
| 1078 | * advertised in a previous ack, and only if rwnd has grown beyond a |
| 1079 | * configurable value. |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1080 | */ |
| 1081 | void |
| 1082 | tcp_send_window_update_ack (tcp_connection_t * tc) |
| 1083 | { |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1084 | if (tcp_zero_rwnd_sent (tc)) |
| 1085 | { |
Florin Coras | 017dc45 | 2019-08-30 11:06:35 -0700 | [diff] [blame] | 1086 | tcp_update_rcv_wnd (tc); |
| 1087 | 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] | 1088 | { |
| 1089 | tcp_zero_rwnd_sent_off (tc); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1090 | tcp_program_ack (tc); |
Vladimir Kropylev | 398afbd | 2019-06-25 00:06:52 +0300 | [diff] [blame] | 1091 | } |
| 1092 | } |
| 1093 | } |
| 1094 | |
| 1095 | /** |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1096 | * Allocate a new buffer and build a new tcp segment |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1097 | * |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1098 | * @param wrk tcp worker |
| 1099 | * @param tc connection for which the segment will be allocated |
| 1100 | * @param offset offset of the first byte in the tx fifo |
| 1101 | * @param max_deq_byte segment size |
| 1102 | * @param[out] b pointer to buffer allocated |
| 1103 | * |
| 1104 | * @return the number of bytes in the segment or 0 if buffer cannot be |
| 1105 | * allocated or no data available |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1106 | */ |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1107 | static int |
| 1108 | tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1109 | u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1110 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1111 | u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer; |
| 1112 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1113 | u32 bi, seg_size; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1114 | int n_bytes = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1115 | u8 *data; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1116 | |
Florin Coras | 1ee7830 | 2019-02-05 15:51:15 -0800 | [diff] [blame] | 1117 | seg_size = max_deq_bytes + TRANSPORT_MAX_HDRS_LEN; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1118 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1119 | /* |
| 1120 | * Prepare options |
| 1121 | */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1122 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 1123 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1124 | /* |
| 1125 | * Allocate and fill in buffer(s) |
| 1126 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1127 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1128 | /* Easy case, buffer size greater than mss */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1129 | if (PREDICT_TRUE (seg_size <= bytes_per_buffer)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1130 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1131 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 1132 | { |
| 1133 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
| 1134 | return 0; |
| 1135 | } |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1136 | *b = vlib_get_buffer (vm, bi); |
| 1137 | data = tcp_init_buffer (vm, *b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1138 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1139 | max_deq_bytes); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1140 | ASSERT (n_bytes == max_deq_bytes); |
| 1141 | b[0]->current_length = n_bytes; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1142 | tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, |
| 1143 | /* burst */ 0, /* update_snd_nxt */ 0); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1144 | } |
| 1145 | /* Split mss into multiple buffers */ |
| 1146 | else |
| 1147 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1148 | u32 chain_bi = ~0, n_bufs_per_seg, n_bufs; |
| 1149 | u16 n_peeked, len_to_deq; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1150 | vlib_buffer_t *chain_b, *prev_b; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1151 | int i; |
| 1152 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1153 | /* Make sure we have enough buffers */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1154 | n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1155 | vec_validate_aligned (wrk->tx_buffers, n_bufs_per_seg - 1, |
| 1156 | CLIB_CACHE_LINE_BYTES); |
| 1157 | n_bufs = vlib_buffer_alloc (vm, wrk->tx_buffers, n_bufs_per_seg); |
| 1158 | if (PREDICT_FALSE (n_bufs != n_bufs_per_seg)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1159 | { |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1160 | if (n_bufs) |
| 1161 | vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 1162 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1163 | return 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1164 | } |
| 1165 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1166 | *b = vlib_get_buffer (vm, wrk->tx_buffers[--n_bufs]); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1167 | data = tcp_init_buffer (vm, *b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1168 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1169 | bytes_per_buffer - |
| 1170 | TRANSPORT_MAX_HDRS_LEN); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1171 | b[0]->current_length = n_bytes; |
| 1172 | b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; |
| 1173 | b[0]->total_length_not_including_first_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1174 | max_deq_bytes -= n_bytes; |
| 1175 | |
| 1176 | chain_b = *b; |
| 1177 | for (i = 1; i < n_bufs_per_seg; i++) |
| 1178 | { |
| 1179 | prev_b = chain_b; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1180 | len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1181 | chain_bi = wrk->tx_buffers[--n_bufs]; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1182 | chain_b = vlib_get_buffer (vm, chain_bi); |
| 1183 | chain_b->current_data = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1184 | data = vlib_buffer_get_current (chain_b); |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1185 | n_peeked = session_tx_fifo_peek_bytes (&tc->connection, data, |
| 1186 | offset + n_bytes, |
| 1187 | len_to_deq); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1188 | ASSERT (n_peeked == len_to_deq); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1189 | n_bytes += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1190 | chain_b->current_length = n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1191 | chain_b->next_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1192 | |
| 1193 | /* update previous buffer */ |
| 1194 | prev_b->next_buffer = chain_bi; |
| 1195 | prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; |
| 1196 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1197 | max_deq_bytes -= n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1198 | b[0]->total_length_not_including_first_buffer += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1199 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1200 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1201 | tcp_push_hdr_i (tc, *b, tc->snd_una + offset, /* compute opts */ 0, |
| 1202 | /* burst */ 0, /* update_snd_nxt */ 0); |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1203 | |
| 1204 | if (PREDICT_FALSE (n_bufs)) |
| 1205 | { |
| 1206 | clib_warning ("not all buffers consumed"); |
| 1207 | vlib_buffer_free (vm, wrk->tx_buffers, n_bufs); |
| 1208 | } |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1209 | } |
| 1210 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1211 | ASSERT (n_bytes > 0); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1212 | ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer); |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1213 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1214 | return n_bytes; |
| 1215 | } |
| 1216 | |
| 1217 | /** |
| 1218 | * Build a retransmit segment |
| 1219 | * |
| 1220 | * @return the number of bytes in the segment or 0 if there's nothing to |
| 1221 | * retransmit |
| 1222 | */ |
| 1223 | static u32 |
| 1224 | tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk, |
| 1225 | tcp_connection_t * tc, u32 offset, |
| 1226 | u32 max_deq_bytes, vlib_buffer_t ** b) |
| 1227 | { |
| 1228 | u32 start, available_bytes; |
| 1229 | int n_bytes = 0; |
| 1230 | |
| 1231 | ASSERT (tc->state >= TCP_STATE_ESTABLISHED); |
| 1232 | ASSERT (max_deq_bytes != 0); |
| 1233 | |
| 1234 | /* |
| 1235 | * Make sure we can retransmit something |
| 1236 | */ |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1237 | available_bytes = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1238 | ASSERT (available_bytes >= offset); |
| 1239 | available_bytes -= offset; |
| 1240 | if (!available_bytes) |
| 1241 | return 0; |
| 1242 | |
| 1243 | max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes); |
| 1244 | max_deq_bytes = clib_min (available_bytes, max_deq_bytes); |
| 1245 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1246 | start = tc->snd_una + offset; |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1247 | ASSERT (seq_leq (start + max_deq_bytes, tc->snd_nxt)); |
| 1248 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1249 | n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b); |
| 1250 | if (!n_bytes) |
| 1251 | return 0; |
| 1252 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1253 | tc->snd_rxt_bytes += n_bytes; |
| 1254 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1255 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1256 | tcp_bt_track_rxt (tc, start, start + n_bytes); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1257 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1258 | tc->bytes_retrans += n_bytes; |
| 1259 | tc->segs_retrans += 1; |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1260 | tcp_worker_stats_inc (wrk, rxt_segs, 1); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1261 | TCP_EVT (TCP_EVT_CC_RTX, tc, offset, n_bytes); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1262 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1263 | return n_bytes; |
| 1264 | } |
| 1265 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1266 | static void |
| 1267 | tcp_check_sack_reneging (tcp_connection_t * tc) |
| 1268 | { |
| 1269 | sack_scoreboard_t *sb = &tc->sack_sb; |
| 1270 | sack_scoreboard_hole_t *hole; |
| 1271 | |
| 1272 | hole = scoreboard_first_hole (sb); |
| 1273 | if (!sb->is_reneging && (!hole || hole->start == tc->snd_una)) |
| 1274 | return; |
| 1275 | |
| 1276 | scoreboard_clear_reneging (sb, tc->snd_una, tc->snd_nxt); |
| 1277 | } |
| 1278 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1279 | /** |
| 1280 | * Reset congestion control, switch cwnd to loss window and try again. |
| 1281 | */ |
| 1282 | static void |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1283 | tcp_cc_init_rxt_timeout (tcp_connection_t * tc) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1284 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1285 | TCP_EVT (TCP_EVT_CC_EVT, tc, 6); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1286 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1287 | tc->prev_ssthresh = tc->ssthresh; |
| 1288 | tc->prev_cwnd = tc->cwnd; |
| 1289 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1290 | /* If we entrered loss without fast recovery, notify cc algo of the |
| 1291 | * congestion event such that it can update ssthresh and its state */ |
| 1292 | if (!tcp_in_fastrecovery (tc)) |
| 1293 | tcp_cc_congestion (tc); |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1294 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1295 | /* Let cc algo decide loss cwnd and ssthresh post unrecovered loss */ |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1296 | tcp_cc_loss (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1297 | |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1298 | tc->rtt_ts = 0; |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1299 | tc->cwnd_acc_bytes = 0; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1300 | tc->tr_occurences += 1; |
Florin Coras | cc4d6d0 | 2020-07-29 23:03:39 -0700 | [diff] [blame] | 1301 | tc->sack_sb.reorder = TCP_DUPACK_THRESHOLD; |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1302 | tcp_recovery_on (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1303 | } |
| 1304 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1305 | void |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1306 | tcp_timer_retransmit_handler (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1307 | { |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1308 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1309 | vlib_main_t *vm = wrk->vm; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1310 | vlib_buffer_t *b = 0; |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1311 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1312 | |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1313 | tcp_worker_stats_inc (wrk, tr_events, 1); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1314 | |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1315 | /* Should be handled by a different handler */ |
| 1316 | if (PREDICT_FALSE (tc->state == TCP_STATE_SYN_SENT)) |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1317 | return; |
| 1318 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1319 | /* Wait-close and retransmit could pop at the same time */ |
| 1320 | if (tc->state == TCP_STATE_CLOSED) |
| 1321 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1322 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1323 | if (tc->state >= TCP_STATE_ESTABLISHED) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1324 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1325 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1326 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1327 | /* Lost FIN, retransmit and return */ |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1328 | if (tc->flags & TCP_CONN_FINSNT) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1329 | { |
| 1330 | tcp_send_fin (tc); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1331 | tc->rto_boff += 1; |
| 1332 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1333 | return; |
| 1334 | } |
| 1335 | |
Florin Coras | eaec00c | 2020-10-22 11:22:22 -0700 | [diff] [blame] | 1336 | /* Shouldn't be here */ |
| 1337 | if (tc->snd_una == tc->snd_nxt) |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1338 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1339 | ASSERT (!tcp_in_recovery (tc)); |
| 1340 | tc->rto_boff = 0; |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1341 | return; |
| 1342 | } |
| 1343 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1344 | /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due |
| 1345 | * to persist timer timeout */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1346 | if (!tcp_in_recovery (tc) && tc->rto_boff > 0) |
| 1347 | { |
| 1348 | tc->rto_boff = 0; |
| 1349 | tcp_update_rto (tc); |
| 1350 | } |
| 1351 | |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1352 | /* Peer is dead or network connectivity is lost. Close connection. |
| 1353 | * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For |
| 1354 | * a min rto of 0.2s we need to retry about 8 times. */ |
| 1355 | if (tc->rto_boff >= TCP_RTO_BOFF_MAX) |
| 1356 | { |
| 1357 | tcp_send_reset (tc); |
| 1358 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 1359 | session_transport_closing_notify (&tc->connection); |
Florin Coras | 52be674 | 2019-11-14 23:32:08 -0800 | [diff] [blame] | 1360 | session_transport_closed_notify (&tc->connection); |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1361 | tcp_connection_timers_reset (tc); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 1362 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1363 | tcp_worker_stats_inc (wrk, tr_abort, 1); |
Florin Coras | 548f757 | 2019-06-07 15:31:06 -0700 | [diff] [blame] | 1364 | return; |
| 1365 | } |
| 1366 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1367 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
| 1368 | tcp_check_sack_reneging (tc); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1369 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1370 | /* Update send congestion to make sure that rxt has data to send */ |
| 1371 | tc->snd_congestion = tc->snd_nxt; |
Florin Coras | a3c3265 | 2019-07-03 17:47:22 -0700 | [diff] [blame] | 1372 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1373 | /* Send the first unacked segment. If we're short on buffers, return |
| 1374 | * as soon as possible */ |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1375 | n_bytes = clib_min (tc->snd_mss, tc->snd_nxt - tc->snd_una); |
| 1376 | n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, n_bytes, &b); |
Florin Coras | 85a3ddd | 2018-12-24 16:54:34 -0800 | [diff] [blame] | 1377 | if (!n_bytes) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1378 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1379 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1380 | return; |
| 1381 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1382 | |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1383 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1384 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1385 | |
| 1386 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | eaec00c | 2020-10-22 11:22:22 -0700 | [diff] [blame] | 1387 | tcp_retransmit_timer_update (&wrk->timer_wheel, tc); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1388 | |
| 1389 | tc->rto_boff += 1; |
| 1390 | if (tc->rto_boff == 1) |
| 1391 | { |
| 1392 | tcp_cc_init_rxt_timeout (tc); |
| 1393 | /* Record timestamp. Eifel detection algorithm RFC3522 */ |
| 1394 | tc->snd_rxt_ts = tcp_tstamp (tc); |
| 1395 | } |
| 1396 | |
| 1397 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1398 | scoreboard_init_rxt (&tc->sack_sb, tc->snd_una + n_bytes); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1399 | |
| 1400 | tcp_program_retransmit (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1401 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1402 | /* Retransmit SYN-ACK */ |
| 1403 | else if (tc->state == TCP_STATE_SYN_RCVD) |
| 1404 | { |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1405 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1406 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1407 | tc->rtt_ts = 0; |
| 1408 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1409 | /* Passive open establish timeout */ |
| 1410 | if (tc->rto > TCP_ESTABLISH_TIME >> 1) |
| 1411 | { |
| 1412 | tcp_connection_set_state (tc, TCP_STATE_CLOSED); |
| 1413 | tcp_connection_timers_reset (tc); |
Florin Coras | 7a3a866 | 2020-02-22 02:27:21 +0000 | [diff] [blame] | 1414 | tcp_program_cleanup (wrk, tc); |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1415 | tcp_worker_stats_inc (wrk, tr_abort, 1); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1416 | return; |
| 1417 | } |
Florin Coras | 222e1f41 | 2019-02-16 20:47:32 -0800 | [diff] [blame] | 1418 | |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1419 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1420 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1421 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 1422 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1423 | return; |
| 1424 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1425 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1426 | tc->rto_boff += 1; |
| 1427 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1428 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1429 | |
Florin Coras | eaec00c | 2020-10-22 11:22:22 -0700 | [diff] [blame] | 1430 | ASSERT (tc->snd_una != tc->snd_nxt); |
| 1431 | tcp_retransmit_timer_update (&wrk->timer_wheel, tc); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1432 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1433 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1434 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1435 | tcp_make_synack (tc, b); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1436 | TCP_EVT (TCP_EVT_SYN_RXT, tc, 1); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1437 | |
| 1438 | /* Retransmit timer already updated, just enqueue to output */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1439 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1440 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1441 | else |
| 1442 | { |
| 1443 | ASSERT (tc->state == TCP_STATE_CLOSED); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1444 | return; |
| 1445 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1446 | } |
| 1447 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1448 | /** |
| 1449 | * SYN retransmit timer handler. Active open only. |
| 1450 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1451 | void |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1452 | tcp_timer_retransmit_syn_handler (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1453 | { |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1454 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1455 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1456 | vlib_buffer_t *b = 0; |
| 1457 | u32 bi; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1458 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1459 | /* Note: the connection may have transitioned to ESTABLISHED... */ |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1460 | if (PREDICT_FALSE (tc->state != TCP_STATE_SYN_SENT)) |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1461 | return; |
| 1462 | |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1463 | /* Half-open connection actually moved to established but we were |
| 1464 | * waiting for syn retransmit to pop to call cleanup from the right |
| 1465 | * thread. */ |
| 1466 | if (tc->flags & TCP_CONN_HALF_OPEN_DONE) |
| 1467 | { |
| 1468 | if (tcp_half_open_connection_cleanup (tc)) |
| 1469 | TCP_DBG ("could not remove half-open connection"); |
| 1470 | return; |
| 1471 | } |
| 1472 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1473 | TCP_EVT (TCP_EVT_CC_EVT, tc, 2); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1474 | tc->rtt_ts = 0; |
| 1475 | |
| 1476 | /* Active open establish timeout */ |
| 1477 | if (tc->rto >= TCP_ESTABLISH_TIME >> 1) |
| 1478 | { |
Florin Coras | 00e01d3 | 2019-10-21 16:07:46 -0700 | [diff] [blame] | 1479 | session_stream_connect_notify (&tc->connection, SESSION_E_TIMEDOUT); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1480 | tcp_connection_cleanup (tc); |
| 1481 | return; |
| 1482 | } |
| 1483 | |
| 1484 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
| 1485 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1486 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN, 1); |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 1487 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1488 | return; |
| 1489 | } |
| 1490 | |
| 1491 | /* Try without increasing RTO a number of times. If this fails, |
| 1492 | * start growing RTO exponentially */ |
| 1493 | tc->rto_boff += 1; |
| 1494 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1495 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1496 | |
| 1497 | b = vlib_get_buffer (vm, bi); |
| 1498 | tcp_init_buffer (vm, b); |
| 1499 | tcp_make_syn (tc, b); |
| 1500 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1501 | TCP_EVT (TCP_EVT_SYN_RXT, tc, 0); |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1502 | |
| 1503 | /* This goes straight to ipx_lookup */ |
| 1504 | tcp_push_ip_hdr (wrk, tc, b); |
| 1505 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
| 1506 | |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1507 | tcp_timer_update (&wrk->timer_wheel, tc, TCP_TIMER_RETRANSMIT_SYN, |
Florin Coras | 75c48c1 | 2019-08-02 15:17:21 -0700 | [diff] [blame] | 1508 | tc->rto * TCP_TO_TIMER_TICK); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1509 | } |
| 1510 | |
| 1511 | /** |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1512 | * Got 0 snd_wnd from peer, try to do something about it. |
| 1513 | * |
| 1514 | */ |
| 1515 | void |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1516 | tcp_timer_persist_handler (tcp_connection_t * tc) |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1517 | { |
Florin Coras | aa38869 | 2020-02-14 23:41:25 +0000 | [diff] [blame] | 1518 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1519 | u32 bi, max_snd_bytes, available_bytes, offset; |
| 1520 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 1521 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1522 | vlib_buffer_t *b; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1523 | int n_bytes = 0; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1524 | u8 *data; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1525 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1526 | /* Problem already solved or worse */ |
Florin Coras | 7e74bf3 | 2019-03-06 16:51:58 -0800 | [diff] [blame] | 1527 | if (tc->state == TCP_STATE_CLOSED || tc->snd_wnd > tc->snd_mss |
| 1528 | || (tc->flags & TCP_CONN_FINSNT)) |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1529 | goto update_scheduler; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1530 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1531 | available_bytes = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1532 | offset = tc->snd_nxt - tc->snd_una; |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1533 | |
| 1534 | /* Reprogram persist if no new bytes available to send. We may have data |
| 1535 | * next time */ |
| 1536 | if (!available_bytes) |
| 1537 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1538 | tcp_persist_timer_set (&wrk->timer_wheel, tc); |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1539 | return; |
| 1540 | } |
| 1541 | |
| 1542 | if (available_bytes <= offset) |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1543 | goto update_scheduler; |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1544 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1545 | /* Increment RTO backoff */ |
| 1546 | tc->rto_boff += 1; |
| 1547 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1548 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1549 | /* |
| 1550 | * Try to force the first unsent segment (or buffer) |
| 1551 | */ |
Florin Coras | bdf7fd6 | 2019-01-31 17:31:01 -0800 | [diff] [blame] | 1552 | if (PREDICT_FALSE (!vlib_buffer_alloc (vm, &bi, 1))) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1553 | { |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1554 | tcp_persist_timer_set (&wrk->timer_wheel, tc); |
Florin Coras | d4712a8 | 2020-05-22 21:51:30 +0000 | [diff] [blame] | 1555 | tcp_worker_stats_inc (wrk, no_buffer, 1); |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1556 | return; |
| 1557 | } |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1558 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1559 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1560 | data = tcp_init_buffer (vm, b); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1561 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1562 | tcp_validate_txf_size (tc, offset); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1563 | 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] | 1564 | max_snd_bytes = clib_min (tc->snd_mss, |
| 1565 | tm->bytes_per_buffer - TRANSPORT_MAX_HDRS_LEN); |
| 1566 | n_bytes = session_tx_fifo_peek_bytes (&tc->connection, data, offset, |
| 1567 | max_snd_bytes); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1568 | b->current_length = n_bytes; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1569 | ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT) |
Florin Coras | 55e556c | 2020-10-23 10:45:48 -0700 | [diff] [blame] | 1570 | || tc->snd_una == tc->snd_nxt |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1571 | || tc->rto_boff > 1)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1572 | |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 1573 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
Florin Coras | dd60b1b | 2019-10-07 17:19:09 -0700 | [diff] [blame] | 1574 | { |
| 1575 | tcp_bt_check_app_limited (tc); |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1576 | tcp_bt_track_tx (tc, n_bytes); |
Florin Coras | dd60b1b | 2019-10-07 17:19:09 -0700 | [diff] [blame] | 1577 | } |
| 1578 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1579 | tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, |
| 1580 | /* burst */ 0, /* update_snd_nxt */ 1); |
Florin Coras | 55e556c | 2020-10-23 10:45:48 -0700 | [diff] [blame] | 1581 | tcp_validate_txf_size (tc, tc->snd_nxt - tc->snd_una); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1582 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1583 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1584 | /* Just sent new data, enable retransmit */ |
Florin Coras | 0765d97 | 2020-03-18 21:26:41 +0000 | [diff] [blame] | 1585 | tcp_retransmit_timer_update (&wrk->timer_wheel, tc); |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1586 | |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 1587 | return; |
| 1588 | |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1589 | update_scheduler: |
| 1590 | |
Florin Coras | 6080e0d | 2020-03-13 20:39:43 +0000 | [diff] [blame] | 1591 | if (tcp_is_descheduled (tc)) |
Florin Coras | 70f879d | 2020-03-13 17:54:42 +0000 | [diff] [blame] | 1592 | transport_connection_reschedule (&tc->connection); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1593 | } |
| 1594 | |
| 1595 | /** |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1596 | * Retransmit first unacked segment |
| 1597 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1598 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1599 | 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] | 1600 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1601 | vlib_main_t *vm = wrk->vm; |
| 1602 | vlib_buffer_t *b; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1603 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1604 | |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1605 | TCP_EVT (TCP_EVT_CC_EVT, tc, 1); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1606 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1607 | 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] | 1608 | if (!n_bytes) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1609 | return -1; |
| 1610 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1611 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1612 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1613 | |
| 1614 | return 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1615 | } |
| 1616 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1617 | static int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1618 | tcp_transmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1619 | u32 burst_size) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1620 | { |
Florin Coras | 635acbf | 2019-07-31 14:11:05 -0700 | [diff] [blame] | 1621 | u32 offset, n_segs = 0, n_written, bi, available_wnd; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1622 | vlib_main_t *vm = wrk->vm; |
| 1623 | vlib_buffer_t *b = 0; |
| 1624 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1625 | offset = tc->snd_nxt - tc->snd_una; |
Florin Coras | 635acbf | 2019-07-31 14:11:05 -0700 | [diff] [blame] | 1626 | available_wnd = tc->snd_wnd - offset; |
| 1627 | burst_size = clib_min (burst_size, available_wnd / tc->snd_mss); |
| 1628 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1629 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 1630 | tcp_bt_check_app_limited (tc); |
| 1631 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1632 | while (n_segs < burst_size) |
| 1633 | { |
| 1634 | n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b); |
| 1635 | if (!n_written) |
| 1636 | goto done; |
| 1637 | |
| 1638 | bi = vlib_get_buffer_index (vm, b); |
| 1639 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
| 1640 | offset += n_written; |
| 1641 | n_segs += 1; |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1642 | |
Florin Coras | d6ae4bf | 2019-10-12 18:10:20 -0700 | [diff] [blame] | 1643 | if (tc->cfg_flags & TCP_CFG_F_RATE_SAMPLE) |
| 1644 | tcp_bt_track_tx (tc, n_written); |
| 1645 | |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1646 | tc->snd_nxt += n_written; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1647 | } |
| 1648 | |
| 1649 | done: |
| 1650 | return n_segs; |
| 1651 | } |
| 1652 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1653 | /** |
| 1654 | * Estimate send space using proportional rate reduction (RFC6937) |
| 1655 | */ |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1656 | int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1657 | tcp_fastrecovery_prr_snd_space (tcp_connection_t * tc) |
| 1658 | { |
| 1659 | u32 pipe, prr_out; |
| 1660 | int space; |
| 1661 | |
| 1662 | pipe = tcp_flight_size (tc); |
| 1663 | prr_out = tc->snd_rxt_bytes + (tc->snd_nxt - tc->snd_congestion); |
| 1664 | |
| 1665 | if (pipe > tc->ssthresh) |
| 1666 | { |
| 1667 | space = ((int) tc->prr_delivered * ((f64) tc->ssthresh / tc->prev_cwnd)) |
| 1668 | - prr_out; |
| 1669 | } |
| 1670 | else |
| 1671 | { |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1672 | int limit; |
| 1673 | 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] | 1674 | space = clib_min (tc->ssthresh - pipe, limit); |
| 1675 | } |
| 1676 | space = clib_max (space, prr_out ? 0 : tc->snd_mss); |
| 1677 | return space; |
| 1678 | } |
| 1679 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1680 | static inline u8 |
| 1681 | tcp_retransmit_should_retry_head (tcp_connection_t * tc, |
| 1682 | sack_scoreboard_t * sb) |
| 1683 | { |
| 1684 | u32 tx_adv_sack = sb->high_sacked - tc->snd_congestion; |
| 1685 | f64 rr = (f64) tc->ssthresh / tc->prev_cwnd; |
| 1686 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 1687 | if (tcp_fastrecovery_first (tc)) |
| 1688 | return 1; |
| 1689 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1690 | return (tx_adv_sack > (tc->snd_una - tc->prr_start) * rr); |
| 1691 | } |
| 1692 | |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1693 | static inline u8 |
| 1694 | tcp_max_tx_deq (tcp_connection_t * tc) |
| 1695 | { |
| 1696 | return (transport_max_tx_dequeue (&tc->connection) |
| 1697 | - (tc->snd_nxt - tc->snd_una)); |
| 1698 | } |
| 1699 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1700 | #define scoreboard_rescue_rxt_valid(_sb, _tc) \ |
| 1701 | (seq_geq (_sb->rescue_rxt, _tc->snd_una) \ |
| 1702 | && seq_leq (_sb->rescue_rxt, _tc->snd_congestion)) |
| 1703 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1704 | /** |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1705 | * Do retransmit with SACKs |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1706 | */ |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1707 | static int |
| 1708 | tcp_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1709 | u32 burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1710 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1711 | u32 n_written = 0, offset, max_bytes, n_segs = 0; |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1712 | u8 snd_limited = 0, can_rescue = 0; |
| 1713 | u32 bi, max_deq, burst_bytes; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1714 | sack_scoreboard_hole_t *hole; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1715 | vlib_main_t *vm = wrk->vm; |
| 1716 | vlib_buffer_t *b = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1717 | sack_scoreboard_t *sb; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1718 | int snd_space; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1719 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1720 | ASSERT (tcp_in_cong_recovery (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1721 | |
Florin Coras | a8e71c8 | 2019-10-22 19:01:39 -0700 | [diff] [blame] | 1722 | burst_bytes = transport_connection_tx_pacer_burst (&tc->connection); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1723 | burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); |
| 1724 | if (!burst_size) |
| 1725 | { |
| 1726 | tcp_program_retransmit (tc); |
| 1727 | return 0; |
| 1728 | } |
| 1729 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1730 | if (tcp_in_recovery (tc)) |
| 1731 | snd_space = tcp_available_cc_snd_space (tc); |
| 1732 | else |
| 1733 | snd_space = tcp_fastrecovery_prr_snd_space (tc); |
| 1734 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1735 | if (snd_space < tc->snd_mss) |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1736 | goto done; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1737 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1738 | sb = &tc->sack_sb; |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1739 | |
| 1740 | /* Check if snd_una is a lost retransmit */ |
Florin Coras | 8a8b05c | 2019-10-16 10:07:39 -0700 | [diff] [blame] | 1741 | if (pool_elts (sb->holes) |
| 1742 | && seq_gt (sb->high_sacked, tc->snd_congestion) |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1743 | && tc->rxt_head != tc->snd_una |
| 1744 | && tcp_retransmit_should_retry_head (tc, sb)) |
| 1745 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1746 | max_bytes = clib_min (tc->snd_mss, tc->snd_congestion - tc->snd_una); |
| 1747 | n_written = tcp_prepare_retransmit_segment (wrk, tc, 0, max_bytes, &b); |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1748 | if (!n_written) |
| 1749 | { |
| 1750 | tcp_program_retransmit (tc); |
| 1751 | goto done; |
| 1752 | } |
| 1753 | bi = vlib_get_buffer_index (vm, b); |
| 1754 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
| 1755 | n_segs = 1; |
| 1756 | |
| 1757 | tc->rxt_head = tc->snd_una; |
| 1758 | tc->rxt_delivered += n_written; |
| 1759 | tc->prr_delivered += n_written; |
| 1760 | ASSERT (tc->rxt_delivered <= tc->snd_rxt_bytes); |
| 1761 | } |
| 1762 | |
Florin Coras | b3dce89 | 2019-10-30 09:22:14 -0700 | [diff] [blame] | 1763 | tcp_fastrecovery_first_off (tc); |
| 1764 | |
Florin Coras | be237bf | 2019-09-27 08:16:40 -0700 | [diff] [blame] | 1765 | TCP_EVT (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1766 | hole = scoreboard_get_hole (sb, sb->cur_rxt_hole); |
| 1767 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1768 | max_deq = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1769 | max_deq -= tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1770 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1771 | while (snd_space > 0 && n_segs < burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1772 | { |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1773 | hole = scoreboard_next_rxt_hole (sb, hole, max_deq != 0, &can_rescue, |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1774 | &snd_limited); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1775 | if (!hole) |
| 1776 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1777 | /* 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] | 1778 | if (max_deq > tc->snd_mss) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1779 | { |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1780 | u32 n_segs_new; |
| 1781 | int av_wnd; |
| 1782 | |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1783 | /* Make sure we don't exceed available window and leave space |
| 1784 | * for one more packet, to avoid zero window acks */ |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1785 | av_wnd = (int) tc->snd_wnd - (tc->snd_nxt - tc->snd_una); |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1786 | av_wnd = clib_max (av_wnd - tc->snd_mss, 0); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1787 | snd_space = clib_min (snd_space, av_wnd); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1788 | snd_space = clib_min (max_deq, snd_space); |
| 1789 | burst_size = clib_min (burst_size - n_segs, |
| 1790 | snd_space / tc->snd_mss); |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1791 | burst_size = clib_min (burst_size, TCP_RXT_MAX_BURST); |
| 1792 | n_segs_new = tcp_transmit_unsent (wrk, tc, burst_size); |
| 1793 | if (max_deq > n_segs_new * tc->snd_mss) |
| 1794 | tcp_program_retransmit (tc); |
| 1795 | |
| 1796 | n_segs += n_segs_new; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1797 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1798 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1799 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1800 | if (tcp_in_recovery (tc) || !can_rescue |
| 1801 | || scoreboard_rescue_rxt_valid (sb, tc)) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1802 | break; |
| 1803 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1804 | /* If rescue rxt undefined or less than snd_una then one segment of |
| 1805 | * up to SMSS octets that MUST include the highest outstanding |
| 1806 | * unSACKed sequence number SHOULD be returned, and RescueRxt set to |
| 1807 | * RecoveryPoint. HighRxt MUST NOT be updated. |
| 1808 | */ |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1809 | hole = scoreboard_last_hole (sb); |
| 1810 | max_bytes = clib_min (tc->snd_mss, hole->end - hole->start); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1811 | max_bytes = clib_min (max_bytes, snd_space); |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1812 | offset = hole->end - tc->snd_una - max_bytes; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1813 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, |
| 1814 | max_bytes, &b); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1815 | if (!n_written) |
| 1816 | goto done; |
| 1817 | |
Florin Coras | 3eba7f1 | 2019-11-15 17:56:48 -0800 | [diff] [blame] | 1818 | sb->rescue_rxt = tc->snd_congestion; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1819 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1820 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1821 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1822 | break; |
| 1823 | } |
| 1824 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1825 | max_bytes = clib_min (hole->end - sb->high_rxt, snd_space); |
| 1826 | max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes; |
| 1827 | if (max_bytes == 0) |
| 1828 | break; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1829 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1830 | offset = sb->high_rxt - tc->snd_una; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1831 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, |
| 1832 | &b); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1833 | ASSERT (n_written <= snd_space); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1834 | |
| 1835 | /* Nothing left to retransmit */ |
| 1836 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1837 | break; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1838 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1839 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1840 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1841 | |
| 1842 | sb->high_rxt += n_written; |
Florin Coras | 81cb8e4 | 2019-10-22 19:44:45 -0700 | [diff] [blame] | 1843 | ASSERT (seq_leq (sb->high_rxt, tc->snd_nxt)); |
| 1844 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1845 | snd_space -= n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1846 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1847 | } |
| 1848 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1849 | if (hole) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1850 | tcp_program_retransmit (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1851 | |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1852 | done: |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1853 | |
Florin Coras | 11e9e35 | 2019-11-13 19:09:47 -0800 | [diff] [blame] | 1854 | transport_connection_tx_pacer_reset_bucket (&tc->connection, 0); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1855 | return n_segs; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1856 | } |
| 1857 | |
| 1858 | /** |
| 1859 | * Fast retransmit without SACK info |
| 1860 | */ |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1861 | static int |
| 1862 | tcp_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1863 | u32 burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1864 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1865 | 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] | 1866 | u32 burst_bytes, sent_bytes; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1867 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1868 | int snd_space, n_segs = 0; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1869 | u8 cc_limited = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1870 | vlib_buffer_t *b; |
| 1871 | |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1872 | ASSERT (tcp_in_cong_recovery (tc)); |
Florin Coras | a436a42 | 2019-08-20 07:09:31 -0700 | [diff] [blame] | 1873 | TCP_EVT (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1874 | |
Florin Coras | a8e71c8 | 2019-10-22 19:01:39 -0700 | [diff] [blame] | 1875 | burst_bytes = transport_connection_tx_pacer_burst (&tc->connection); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1876 | burst_size = clib_min (burst_size, burst_bytes / tc->snd_mss); |
| 1877 | if (!burst_size) |
| 1878 | { |
| 1879 | tcp_program_retransmit (tc); |
| 1880 | return 0; |
| 1881 | } |
| 1882 | |
Florin Coras | 87a9bf8 | 2019-06-12 11:26:35 -0700 | [diff] [blame] | 1883 | snd_space = tcp_available_cc_snd_space (tc); |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1884 | cc_limited = snd_space < burst_bytes; |
Florin Coras | 87a9bf8 | 2019-06-12 11:26:35 -0700 | [diff] [blame] | 1885 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1886 | if (!tcp_fastrecovery_first (tc)) |
| 1887 | goto send_unsent; |
| 1888 | |
| 1889 | /* RFC 6582: [If a partial ack], retransmit the first unacknowledged |
| 1890 | * segment. */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1891 | while (snd_space > 0 && n_segs < burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1892 | { |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1893 | max_bytes = clib_min (tc->snd_mss, |
| 1894 | tc->snd_congestion - tc->snd_una - offset); |
| 1895 | if (!max_bytes) |
| 1896 | break; |
| 1897 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, |
| 1898 | &b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1899 | |
| 1900 | /* Nothing left to retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1901 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1902 | break; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1903 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1904 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1905 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1906 | snd_space -= n_written; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1907 | offset += n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1908 | n_segs += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1909 | } |
| 1910 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1911 | if (n_segs == burst_size) |
| 1912 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1913 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1914 | send_unsent: |
| 1915 | |
| 1916 | /* 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] | 1917 | if (snd_space < tc->snd_mss || tc->snd_mss == 0) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1918 | goto done; |
| 1919 | |
Florin Coras | 31c9955 | 2019-03-01 13:00:58 -0800 | [diff] [blame] | 1920 | max_deq = transport_max_tx_dequeue (&tc->connection); |
Florin Coras | 4759683 | 2019-03-12 18:58:54 -0700 | [diff] [blame] | 1921 | max_deq -= tc->snd_nxt - tc->snd_una; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1922 | if (max_deq) |
| 1923 | { |
| 1924 | snd_space = clib_min (max_deq, snd_space); |
| 1925 | 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] | 1926 | n_segs_now = tcp_transmit_unsent (wrk, tc, burst_size); |
Florin Coras | bf1f8b7 | 2019-11-04 14:39:33 -0800 | [diff] [blame] | 1927 | if (n_segs_now && max_deq > n_segs_now * tc->snd_mss) |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1928 | tcp_program_retransmit (tc); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1929 | n_segs += n_segs_now; |
| 1930 | } |
| 1931 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1932 | done: |
| 1933 | tcp_fastrecovery_first_off (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1934 | |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 1935 | sent_bytes = clib_min (n_segs * tc->snd_mss, burst_bytes); |
| 1936 | sent_bytes = cc_limited ? burst_bytes : sent_bytes; |
| 1937 | transport_connection_tx_pacer_update_bytes (&tc->connection, sent_bytes); |
| 1938 | |
| 1939 | return n_segs; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1940 | } |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1941 | |
| 1942 | static int |
| 1943 | tcp_send_acks (tcp_connection_t * tc, u32 max_burst_size) |
| 1944 | { |
| 1945 | int j, n_acks; |
| 1946 | |
| 1947 | if (!tc->pending_dupacks) |
| 1948 | { |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1949 | if (tcp_in_cong_recovery (tc) || !tcp_max_tx_deq (tc) |
| 1950 | || tc->state != TCP_STATE_ESTABLISHED) |
| 1951 | { |
| 1952 | tcp_send_ack (tc); |
| 1953 | return 1; |
| 1954 | } |
| 1955 | return 0; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1956 | } |
| 1957 | |
| 1958 | /* If we're supposed to send dupacks but have no ooo data |
| 1959 | * send only one ack */ |
| 1960 | if (!vec_len (tc->snd_sacks)) |
| 1961 | { |
| 1962 | tcp_send_ack (tc); |
Florin Coras | 7fd59cc | 2020-03-12 15:50:57 +0000 | [diff] [blame] | 1963 | tc->dupacks_out += 1; |
Florin Coras | cb711a4 | 2019-10-16 19:28:17 -0700 | [diff] [blame] | 1964 | tc->pending_dupacks = 0; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1965 | return 1; |
| 1966 | } |
| 1967 | |
| 1968 | /* Start with first sack block */ |
| 1969 | tc->snd_sack_pos = 0; |
| 1970 | |
| 1971 | /* Generate enough dupacks to cover all sack blocks. Do not generate |
| 1972 | * more sacks than the number of packets received. But do generate at |
| 1973 | * least 3, i.e., the number needed to signal congestion, if needed. */ |
| 1974 | n_acks = vec_len (tc->snd_sacks) / TCP_OPTS_MAX_SACK_BLOCKS; |
| 1975 | n_acks = clib_min (n_acks, tc->pending_dupacks); |
| 1976 | n_acks = clib_max (n_acks, clib_min (tc->pending_dupacks, 3)); |
| 1977 | for (j = 0; j < clib_min (n_acks, max_burst_size); j++) |
| 1978 | tcp_send_ack (tc); |
| 1979 | |
| 1980 | if (n_acks < max_burst_size) |
| 1981 | { |
| 1982 | tc->pending_dupacks = 0; |
| 1983 | tc->snd_sack_pos = 0; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1984 | tc->dupacks_out += n_acks; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1985 | return n_acks; |
| 1986 | } |
| 1987 | else |
| 1988 | { |
| 1989 | TCP_DBG ("constrained by burst size"); |
| 1990 | tc->pending_dupacks = n_acks - max_burst_size; |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 1991 | tc->dupacks_out += max_burst_size; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1992 | tcp_program_dupack (tc); |
| 1993 | return max_burst_size; |
| 1994 | } |
| 1995 | } |
| 1996 | |
| 1997 | static int |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 1998 | tcp_do_retransmit (tcp_connection_t * tc, u32 max_burst_size) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 1999 | { |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2000 | tcp_worker_ctx_t *wrk; |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2001 | u32 n_segs; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2002 | |
Florin Coras | fd4c3fe | 2019-11-07 12:33:12 -0800 | [diff] [blame] | 2003 | if (PREDICT_FALSE (tc->state == TCP_STATE_CLOSED)) |
| 2004 | return 0; |
| 2005 | |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2006 | wrk = tcp_get_worker (tc->c_thread_index); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2007 | |
Florin Coras | c31dc31 | 2019-10-06 14:06:14 -0700 | [diff] [blame] | 2008 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
| 2009 | n_segs = tcp_retransmit_sack (wrk, tc, max_burst_size); |
| 2010 | else |
| 2011 | n_segs = tcp_retransmit_no_sack (wrk, tc, max_burst_size); |
| 2012 | |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2013 | return n_segs; |
| 2014 | } |
| 2015 | |
| 2016 | int |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2017 | tcp_session_custom_tx (void *conn, transport_send_params_t * sp) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2018 | { |
| 2019 | tcp_connection_t *tc = (tcp_connection_t *) conn; |
| 2020 | u32 n_segs = 0; |
| 2021 | |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2022 | if (tcp_in_cong_recovery (tc) && (tc->flags & TCP_CONN_RXT_PENDING)) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2023 | { |
Florin Coras | 36ebcff | 2019-09-12 18:36:44 -0700 | [diff] [blame] | 2024 | tc->flags &= ~TCP_CONN_RXT_PENDING; |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2025 | n_segs = tcp_do_retransmit (tc, sp->max_burst_size); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2026 | } |
| 2027 | |
| 2028 | if (!(tc->flags & TCP_CONN_SNDACK)) |
| 2029 | return n_segs; |
| 2030 | |
| 2031 | tc->flags &= ~TCP_CONN_SNDACK; |
| 2032 | |
| 2033 | /* We have retransmitted packets and no dupack */ |
| 2034 | if (n_segs && !tc->pending_dupacks) |
| 2035 | return n_segs; |
| 2036 | |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2037 | if (sp->max_burst_size <= n_segs) |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2038 | { |
| 2039 | tcp_program_ack (tc); |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2040 | return n_segs; |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2041 | } |
| 2042 | |
Florin Coras | 9f86d22 | 2020-03-23 15:34:22 +0000 | [diff] [blame] | 2043 | n_segs += tcp_send_acks (tc, sp->max_burst_size - n_segs); |
Florin Coras | 26dd6de | 2019-07-23 23:54:47 -0700 | [diff] [blame] | 2044 | |
| 2045 | return n_segs; |
| 2046 | } |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2047 | #endif /* CLIB_MARCH_VARIANT */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2048 | |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2049 | static void |
| 2050 | 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] | 2051 | u16 * next0, u32 * error0) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2052 | { |
| 2053 | ip_adjacency_t *adj; |
| 2054 | adj_index_t ai; |
| 2055 | |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2056 | /* Not thread safe but as long as the connection exists the adj should |
| 2057 | * not be removed */ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2058 | ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip, |
| 2059 | tc0->sw_if_index); |
| 2060 | if (ai == ADJ_INDEX_INVALID) |
| 2061 | { |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2062 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
| 2063 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2064 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 2065 | return; |
| 2066 | } |
| 2067 | |
| 2068 | adj = adj_get (ai); |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2069 | if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2070 | *next0 = TCP_OUTPUT_NEXT_IP_REWRITE; |
| 2071 | else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP) |
| 2072 | *next0 = TCP_OUTPUT_NEXT_IP_ARP; |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 2073 | else |
| 2074 | { |
| 2075 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2076 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 2077 | } |
| 2078 | vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai; |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 2079 | } |
| 2080 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2081 | static void |
| 2082 | tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2083 | u32 * to_next, u32 n_bufs) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2084 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2085 | tcp_connection_t *tc; |
| 2086 | tcp_tx_trace_t *t; |
| 2087 | vlib_buffer_t *b; |
| 2088 | tcp_header_t *th; |
| 2089 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2090 | |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 2091 | for (i = 0; i < n_bufs; i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2092 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2093 | b = vlib_get_buffer (vm, to_next[i]); |
Florin Coras | 30928f8 | 2020-01-27 19:21:28 -0800 | [diff] [blame] | 2094 | if (!(b->flags & VLIB_BUFFER_IS_TRACED)) |
| 2095 | continue; |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2096 | th = vlib_buffer_get_current (b); |
| 2097 | tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, |
| 2098 | vm->thread_index); |
| 2099 | t = vlib_add_trace (vm, node, b, sizeof (*t)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2100 | clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header)); |
| 2101 | clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2102 | } |
| 2103 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2104 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2105 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2106 | tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0, |
| 2107 | tcp_connection_t * tc0, u8 is_ip4) |
| 2108 | { |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2109 | TCP_EVT (TCP_EVT_OUTPUT, tc0, |
| 2110 | ((tcp_header_t *) vlib_buffer_get_current (b0))->flags, |
| 2111 | b0->current_length); |
Srikanth A | 02833ff | 2019-10-02 17:48:58 -0700 | [diff] [blame] | 2112 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2113 | if (is_ip4) |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2114 | vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4, |
| 2115 | IP_PROTOCOL_TCP, tcp_csum_offload (tc0)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2116 | else |
Florin Coras | f4ce6ba | 2019-11-20 18:34:58 -0800 | [diff] [blame] | 2117 | vlib_buffer_push_ip6_custom (vm, b0, &tc0->c_lcl_ip6, &tc0->c_rmt_ip6, |
| 2118 | IP_PROTOCOL_TCP, tc0->ipv6_flow_label); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2119 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2120 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2121 | always_inline void |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2122 | tcp_check_if_gso (tcp_connection_t * tc, vlib_buffer_t * b) |
| 2123 | { |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 2124 | if (PREDICT_TRUE (!(tc->cfg_flags & TCP_CFG_F_TSO))) |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2125 | return; |
Florin Coras | bbcfaac | 2019-10-10 13:52:04 -0700 | [diff] [blame] | 2126 | |
Simon Zhang | 8a047ed | 2019-09-24 21:16:56 +0800 | [diff] [blame] | 2127 | 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] | 2128 | |
Simon Zhang | 8a047ed | 2019-09-24 21:16:56 +0800 | [diff] [blame] | 2129 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)) |
| 2130 | data_len += b->total_length_not_including_first_buffer; |
| 2131 | |
| 2132 | if (PREDICT_TRUE (data_len <= tc->snd_mss)) |
| 2133 | return; |
| 2134 | else |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2135 | { |
| 2136 | ASSERT ((b->flags & VNET_BUFFER_F_L3_HDR_OFFSET_VALID) != 0); |
| 2137 | ASSERT ((b->flags & VNET_BUFFER_F_L4_HDR_OFFSET_VALID) != 0); |
| 2138 | b->flags |= VNET_BUFFER_F_GSO; |
| 2139 | vnet_buffer2 (b)->gso_l4_hdr_sz = |
| 2140 | sizeof (tcp_header_t) + tc->snd_opts_len; |
| 2141 | vnet_buffer2 (b)->gso_size = tc->snd_mss; |
| 2142 | } |
| 2143 | } |
| 2144 | |
| 2145 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2146 | tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0, |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2147 | vlib_node_runtime_t * error_node, u16 * next0, |
| 2148 | u8 is_ip4) |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2149 | { |
Florin Coras | 540a8da | 2019-06-18 08:55:14 -0700 | [diff] [blame] | 2150 | /* If next_index is not drop use it */ |
Florin Coras | 07beade | 2019-06-20 12:18:31 -0700 | [diff] [blame] | 2151 | if (tc0->next_node_index) |
| 2152 | { |
| 2153 | *next0 = tc0->next_node_index; |
| 2154 | vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque; |
| 2155 | } |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2156 | else |
| 2157 | { |
| 2158 | *next0 = TCP_OUTPUT_NEXT_IP_LOOKUP; |
| 2159 | } |
Florin Coras | 540a8da | 2019-06-18 08:55:14 -0700 | [diff] [blame] | 2160 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2161 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index; |
| 2162 | vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; |
| 2163 | |
| 2164 | if (!is_ip4) |
| 2165 | { |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2166 | u32 error0 = 0; |
| 2167 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2168 | 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] | 2169 | tcp_output_handle_link_local (tc0, b0, next0, &error0); |
| 2170 | |
| 2171 | if (PREDICT_FALSE (error0)) |
| 2172 | { |
| 2173 | b0->error = error_node->errors[error0]; |
| 2174 | return; |
| 2175 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2176 | } |
| 2177 | |
Florin Coras | edfe0ee | 2019-07-29 18:13:25 -0700 | [diff] [blame] | 2178 | tc0->segs_out += 1; |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2179 | } |
| 2180 | |
| 2181 | always_inline uword |
| 2182 | tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2183 | vlib_frame_t * frame, int is_ip4) |
| 2184 | { |
| 2185 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 2186 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 2187 | u16 nexts[VLIB_FRAME_SIZE], *next; |
| 2188 | |
| 2189 | from = vlib_frame_vector_args (frame); |
| 2190 | n_left_from = frame->n_vectors; |
Florin Coras | 8f10b90 | 2021-04-02 18:32:00 -0700 | [diff] [blame^] | 2191 | tcp_update_time_now (tcp_get_worker (thread_index)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2192 | |
| 2193 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 2194 | tcp46_output_trace_frame (vm, node, from, n_left_from); |
| 2195 | |
| 2196 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2197 | b = bufs; |
| 2198 | next = nexts; |
| 2199 | |
| 2200 | while (n_left_from >= 4) |
| 2201 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2202 | tcp_connection_t *tc0, *tc1; |
| 2203 | |
| 2204 | { |
| 2205 | vlib_prefetch_buffer_header (b[2], STORE); |
| 2206 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2207 | |
| 2208 | vlib_prefetch_buffer_header (b[3], STORE); |
| 2209 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2210 | } |
| 2211 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2212 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2213 | thread_index); |
| 2214 | tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index, |
| 2215 | thread_index); |
| 2216 | |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2217 | if (PREDICT_TRUE (!tc0 + !tc1 == 0)) |
| 2218 | { |
| 2219 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
| 2220 | tcp_output_push_ip (vm, b[1], tc1, is_ip4); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2221 | |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2222 | tcp_check_if_gso (tc0, b[0]); |
| 2223 | tcp_check_if_gso (tc1, b[1]); |
| 2224 | |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2225 | tcp_output_handle_packet (tc0, b[0], node, &next[0], is_ip4); |
| 2226 | tcp_output_handle_packet (tc1, b[1], node, &next[1], is_ip4); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2227 | } |
| 2228 | else |
| 2229 | { |
| 2230 | if (tc0 != 0) |
| 2231 | { |
| 2232 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2233 | tcp_check_if_gso (tc0, b[0]); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2234 | tcp_output_handle_packet (tc0, b[0], node, &next[0], is_ip4); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2235 | } |
| 2236 | else |
| 2237 | { |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2238 | b[0]->error = node->errors[TCP_ERROR_INVALID_CONNECTION]; |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2239 | next[0] = TCP_OUTPUT_NEXT_DROP; |
| 2240 | } |
| 2241 | if (tc1 != 0) |
| 2242 | { |
| 2243 | tcp_output_push_ip (vm, b[1], tc1, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2244 | tcp_check_if_gso (tc1, b[1]); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2245 | tcp_output_handle_packet (tc1, b[1], node, &next[1], is_ip4); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2246 | } |
| 2247 | else |
| 2248 | { |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2249 | b[1]->error = node->errors[TCP_ERROR_INVALID_CONNECTION]; |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2250 | next[1] = TCP_OUTPUT_NEXT_DROP; |
| 2251 | } |
| 2252 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2253 | |
| 2254 | b += 2; |
| 2255 | next += 2; |
| 2256 | n_left_from -= 2; |
| 2257 | } |
| 2258 | while (n_left_from > 0) |
| 2259 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2260 | tcp_connection_t *tc0; |
| 2261 | |
| 2262 | if (n_left_from > 1) |
| 2263 | { |
Florin Coras | 91ca462 | 2018-06-30 11:27:59 -0700 | [diff] [blame] | 2264 | vlib_prefetch_buffer_header (b[1], STORE); |
| 2265 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2266 | } |
| 2267 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2268 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2269 | thread_index); |
| 2270 | |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2271 | if (PREDICT_TRUE (tc0 != 0)) |
| 2272 | { |
| 2273 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
Simon Zhang | 1146ff4 | 2019-09-02 22:54:00 +0800 | [diff] [blame] | 2274 | tcp_check_if_gso (tc0, b[0]); |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2275 | tcp_output_handle_packet (tc0, b[0], node, &next[0], is_ip4); |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2276 | } |
| 2277 | else |
| 2278 | { |
Florin Coras | 573f44c | 2020-04-09 21:23:01 +0000 | [diff] [blame] | 2279 | b[0]->error = node->errors[TCP_ERROR_INVALID_CONNECTION]; |
Florin Coras | 78dae00 | 2019-08-30 10:00:30 -0700 | [diff] [blame] | 2280 | next[0] = TCP_OUTPUT_NEXT_DROP; |
| 2281 | } |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2282 | |
| 2283 | b += 1; |
| 2284 | next += 1; |
| 2285 | n_left_from -= 1; |
| 2286 | } |
| 2287 | |
| 2288 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
Florin Coras | df36f49 | 2019-08-18 18:09:28 -0700 | [diff] [blame] | 2289 | vlib_node_increment_counter (vm, tcp_node_index (output, is_ip4), |
| 2290 | TCP_ERROR_PKTS_SENT, frame->n_vectors); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2291 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2292 | } |
| 2293 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2294 | VLIB_NODE_FN (tcp4_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, 1 /* is_ip4 */ ); |
| 2298 | } |
| 2299 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2300 | VLIB_NODE_FN (tcp6_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2301 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2302 | { |
| 2303 | return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2304 | } |
| 2305 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2306 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2307 | VLIB_REGISTER_NODE (tcp4_output_node) = |
| 2308 | { |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2309 | .name = "tcp4-output", |
| 2310 | /* Takes a vector of packets. */ |
| 2311 | .vector_size = sizeof (u32), |
| 2312 | .n_errors = TCP_N_ERROR, |
Dave Barach | 7fff3d2 | 2018-11-27 16:52:59 -0500 | [diff] [blame] | 2313 | .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2314 | .error_strings = tcp_error_strings, |
| 2315 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2316 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2317 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2318 | foreach_tcp4_output_next |
| 2319 | #undef _ |
Dave Barach | f970d2f | 2018-11-26 18:34:33 -0500 | [diff] [blame] | 2320 | }, |
| 2321 | .format_buffer = format_tcp_header, |
| 2322 | .format_trace = format_tcp_tx_trace, |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2323 | }; |
| 2324 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2325 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2326 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2327 | VLIB_REGISTER_NODE (tcp6_output_node) = |
| 2328 | { |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2329 | .name = "tcp6-output", |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2330 | /* Takes a vector of packets. */ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2331 | .vector_size = sizeof (u32), |
| 2332 | .n_errors = TCP_N_ERROR, |
Dave Barach | 7fff3d2 | 2018-11-27 16:52:59 -0500 | [diff] [blame] | 2333 | .protocol_hint = VLIB_NODE_PROTO_HINT_TCP, |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2334 | .error_strings = tcp_error_strings, |
| 2335 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2336 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2337 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2338 | foreach_tcp6_output_next |
| 2339 | #undef _ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2340 | }, |
| 2341 | .format_buffer = format_tcp_header, |
| 2342 | .format_trace = format_tcp_tx_trace, |
| 2343 | }; |
| 2344 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2345 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2346 | typedef enum _tcp_reset_next |
| 2347 | { |
| 2348 | TCP_RESET_NEXT_DROP, |
| 2349 | TCP_RESET_NEXT_IP_LOOKUP, |
| 2350 | TCP_RESET_N_NEXT |
| 2351 | } tcp_reset_next_t; |
| 2352 | |
| 2353 | #define foreach_tcp4_reset_next \ |
| 2354 | _(DROP, "error-drop") \ |
| 2355 | _(IP_LOOKUP, "ip4-lookup") |
| 2356 | |
| 2357 | #define foreach_tcp6_reset_next \ |
| 2358 | _(DROP, "error-drop") \ |
| 2359 | _(IP_LOOKUP, "ip6-lookup") |
| 2360 | |
| 2361 | static uword |
| 2362 | tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2363 | vlib_frame_t * from_frame, u8 is_ip4) |
| 2364 | { |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 2365 | u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2366 | u32 n_left_from, next_index, *from, *to_next; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2367 | |
| 2368 | from = vlib_frame_vector_args (from_frame); |
| 2369 | n_left_from = from_frame->n_vectors; |
| 2370 | |
| 2371 | next_index = node->cached_next_index; |
| 2372 | |
| 2373 | while (n_left_from > 0) |
| 2374 | { |
| 2375 | u32 n_left_to_next; |
| 2376 | |
| 2377 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2378 | |
| 2379 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2380 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2381 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2382 | tcp_tx_trace_t *t0; |
| 2383 | tcp_header_t *th0; |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 2384 | u32 bi0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2385 | |
| 2386 | bi0 = from[0]; |
| 2387 | to_next[0] = bi0; |
| 2388 | from += 1; |
| 2389 | to_next += 1; |
| 2390 | n_left_from -= 1; |
| 2391 | n_left_to_next -= 1; |
| 2392 | |
| 2393 | b0 = vlib_get_buffer (vm, bi0); |
Florin Coras | 360336f | 2020-02-13 18:46:18 +0000 | [diff] [blame] | 2394 | tcp_make_reset_in_place (vm, b0, is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2395 | |
| 2396 | /* Prepare to send to IP lookup */ |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 2397 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2398 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2399 | b0->error = node->errors[error0]; |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 2400 | b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2401 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2402 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2403 | th0 = vlib_buffer_get_current (b0); |
| 2404 | if (is_ip4) |
| 2405 | th0 = ip4_next_header ((ip4_header_t *) th0); |
| 2406 | else |
| 2407 | th0 = ip6_next_header ((ip6_header_t *) th0); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2408 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
Dave Barach | 178cf49 | 2018-11-13 16:34:13 -0500 | [diff] [blame] | 2409 | clib_memcpy_fast (&t0->tcp_header, th0, |
| 2410 | sizeof (t0->tcp_header)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2411 | } |
| 2412 | |
| 2413 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2414 | n_left_to_next, bi0, next0); |
| 2415 | } |
| 2416 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2417 | } |
| 2418 | return from_frame->n_vectors; |
| 2419 | } |
| 2420 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2421 | VLIB_NODE_FN (tcp4_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, 1); |
| 2425 | } |
| 2426 | |
Filip Tehlar | e275bed | 2019-03-06 00:06:56 -0800 | [diff] [blame] | 2427 | VLIB_NODE_FN (tcp6_reset_node) (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2428 | vlib_frame_t * from_frame) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2429 | { |
| 2430 | return tcp46_send_reset_inline (vm, node, from_frame, 0); |
| 2431 | } |
| 2432 | |
| 2433 | /* *INDENT-OFF* */ |
| 2434 | VLIB_REGISTER_NODE (tcp4_reset_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2435 | .name = "tcp4-reset", |
| 2436 | .vector_size = sizeof (u32), |
| 2437 | .n_errors = TCP_N_ERROR, |
| 2438 | .error_strings = tcp_error_strings, |
| 2439 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2440 | .next_nodes = { |
| 2441 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2442 | foreach_tcp4_reset_next |
| 2443 | #undef _ |
| 2444 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2445 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2446 | }; |
| 2447 | /* *INDENT-ON* */ |
| 2448 | |
| 2449 | /* *INDENT-OFF* */ |
| 2450 | VLIB_REGISTER_NODE (tcp6_reset_node) = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2451 | .name = "tcp6-reset", |
| 2452 | .vector_size = sizeof (u32), |
| 2453 | .n_errors = TCP_N_ERROR, |
| 2454 | .error_strings = tcp_error_strings, |
| 2455 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2456 | .next_nodes = { |
| 2457 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2458 | foreach_tcp6_reset_next |
| 2459 | #undef _ |
| 2460 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2461 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2462 | }; |
| 2463 | /* *INDENT-ON* */ |
| 2464 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2465 | /* |
| 2466 | * fd.io coding-style-patch-verification: ON |
| 2467 | * |
| 2468 | * Local Variables: |
| 2469 | * eval: (c-set-style "gnu") |
| 2470 | * End: |
| 2471 | */ |