Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016 Cisco and/or its affiliates. |
| 3 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | * you may not use this file except in compliance with the License. |
| 5 | * You may obtain a copy of the License at: |
| 6 | * |
| 7 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | * |
| 9 | * Unless required by applicable law or agreed to in writing, software |
| 10 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | * See the License for the specific language governing permissions and |
| 13 | * limitations under the License. |
| 14 | */ |
| 15 | |
| 16 | #include <vnet/tcp/tcp.h> |
| 17 | #include <vnet/lisp-cp/packets.h> |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 18 | #include <math.h> |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 19 | |
| 20 | vlib_node_registration_t tcp4_output_node; |
| 21 | vlib_node_registration_t tcp6_output_node; |
| 22 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 23 | typedef enum _tcp_output_next |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 24 | { |
| 25 | TCP_OUTPUT_NEXT_DROP, |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 26 | TCP_OUTPUT_NEXT_IP_LOOKUP, |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 27 | TCP_OUTPUT_NEXT_IP_REWRITE, |
| 28 | TCP_OUTPUT_NEXT_IP_ARP, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 29 | TCP_OUTPUT_N_NEXT |
| 30 | } tcp_output_next_t; |
| 31 | |
| 32 | #define foreach_tcp4_output_next \ |
| 33 | _ (DROP, "error-drop") \ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 34 | _ (IP_LOOKUP, "ip4-lookup") \ |
| 35 | _ (IP_REWRITE, "ip4-rewrite") \ |
| 36 | _ (IP_ARP, "ip4-arp") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 37 | |
| 38 | #define foreach_tcp6_output_next \ |
| 39 | _ (DROP, "error-drop") \ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 40 | _ (IP_LOOKUP, "ip6-lookup") \ |
| 41 | _ (IP_REWRITE, "ip6-rewrite") \ |
| 42 | _ (IP_ARP, "ip6-discover-neighbor") |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 43 | |
| 44 | static char *tcp_error_strings[] = { |
| 45 | #define tcp_error(n,s) s, |
| 46 | #include <vnet/tcp/tcp_error.def> |
| 47 | #undef tcp_error |
| 48 | }; |
| 49 | |
| 50 | typedef struct |
| 51 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 52 | tcp_header_t tcp_header; |
| 53 | tcp_connection_t tcp_connection; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 54 | } tcp_tx_trace_t; |
| 55 | |
Florin Coras | f6d68ed | 2017-05-07 19:12:02 -0700 | [diff] [blame] | 56 | u16 dummy_mtu = 1460; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 57 | |
| 58 | u8 * |
| 59 | format_tcp_tx_trace (u8 * s, va_list * args) |
| 60 | { |
| 61 | CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); |
| 62 | CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 63 | tcp_tx_trace_t *t = va_arg (*args, tcp_tx_trace_t *); |
Christophe Fontaine | d3c008d | 2017-10-02 18:10:54 +0200 | [diff] [blame] | 64 | u32 indent = format_get_indent (s); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 65 | |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 66 | s = format (s, "%U\n%U%U", |
| 67 | format_tcp_header, &t->tcp_header, 128, |
| 68 | format_white_space, indent, |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 69 | format_tcp_connection, &t->tcp_connection, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 70 | |
| 71 | return s; |
| 72 | } |
| 73 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 74 | static u8 |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 75 | tcp_window_compute_scale (u32 window) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 76 | { |
| 77 | u8 wnd_scale = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 78 | 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] | 79 | wnd_scale++; |
| 80 | return wnd_scale; |
| 81 | } |
| 82 | |
| 83 | /** |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 84 | * Update max segment size we're able to process. |
| 85 | * |
| 86 | * The value is constrained by our interface's MTU and IP options. It is |
| 87 | * also what we advertise to our peer. |
| 88 | */ |
| 89 | void |
| 90 | tcp_update_rcv_mss (tcp_connection_t * tc) |
| 91 | { |
| 92 | /* TODO find our iface MTU */ |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 93 | tc->mss = dummy_mtu - sizeof (tcp_header_t); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | /** |
| 97 | * TCP's initial window |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 98 | */ |
| 99 | always_inline u32 |
| 100 | tcp_initial_wnd_unscaled (tcp_connection_t * tc) |
| 101 | { |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 102 | /* RFC 6928 recommends the value lower. However at the time our connections |
| 103 | * are initialized, fifos may not be allocated. Therefore, advertise the |
| 104 | * smallest possible unscaled window size and update once fifos are |
| 105 | * assigned to the session. |
| 106 | */ |
| 107 | /* |
| 108 | tcp_update_rcv_mss (tc); |
| 109 | TCP_IW_N_SEGMENTS * tc->mss; |
| 110 | */ |
| 111 | return TCP_MIN_RX_FIFO_SIZE; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 115 | * Compute initial window and scale factor. As per RFC1323, window field in |
| 116 | * SYN and SYN-ACK segments is never scaled. |
| 117 | */ |
| 118 | u32 |
| 119 | tcp_initial_window_to_advertise (tcp_connection_t * tc) |
| 120 | { |
Florin Coras | ca03186 | 2018-09-24 13:58:05 -0700 | [diff] [blame] | 121 | tcp_main_t *tm = &tcp_main; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 122 | u32 max_fifo; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 123 | |
| 124 | /* Initial wnd for SYN. Fifos are not allocated yet. |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 125 | * Use some predefined value. For SYN-ACK we still want the |
| 126 | * scale to be computed in the same way */ |
Florin Coras | ca03186 | 2018-09-24 13:58:05 -0700 | [diff] [blame] | 127 | max_fifo = tm->max_rx_fifo ? tm->max_rx_fifo : TCP_MAX_RX_FIFO_SIZE; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 128 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 129 | tc->rcv_wscale = tcp_window_compute_scale (max_fifo); |
| 130 | tc->rcv_wnd = tcp_initial_wnd_unscaled (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 131 | |
| 132 | return clib_min (tc->rcv_wnd, TCP_WND_MAX); |
| 133 | } |
| 134 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 135 | static void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 136 | tcp_update_rcv_wnd (tcp_connection_t * tc) |
| 137 | { |
| 138 | i32 observed_wnd; |
| 139 | u32 available_space, max_fifo, wnd; |
| 140 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 141 | /* |
| 142 | * Figure out how much space we have available |
| 143 | */ |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 144 | available_space = transport_max_rx_enqueue (&tc->connection); |
| 145 | max_fifo = transport_rx_fifo_size (&tc->connection); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 146 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 147 | ASSERT (tc->rcv_opts.mss < max_fifo); |
| 148 | if (available_space < tc->rcv_opts.mss && available_space < max_fifo >> 3) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 149 | available_space = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 150 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 151 | /* |
| 152 | * Use the above and what we know about what we've previously advertised |
| 153 | * to compute the new window |
| 154 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 155 | observed_wnd = (i32) tc->rcv_wnd - (tc->rcv_nxt - tc->rcv_las); |
| 156 | if (observed_wnd < 0) |
| 157 | observed_wnd = 0; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 158 | |
| 159 | /* Bad. Thou shalt not shrink */ |
| 160 | if (available_space < observed_wnd) |
| 161 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 162 | wnd = observed_wnd; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 163 | TCP_EVT_DBG (TCP_EVT_RCV_WND_SHRUNK, tc, observed_wnd, available_space); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 164 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 165 | else |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 166 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 167 | wnd = available_space; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 168 | } |
| 169 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 170 | /* Make sure we have a multiple of rcv_wscale */ |
| 171 | if (wnd && tc->rcv_wscale) |
| 172 | { |
| 173 | wnd &= ~(1 << tc->rcv_wscale); |
| 174 | if (wnd == 0) |
| 175 | wnd = 1 << tc->rcv_wscale; |
| 176 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 177 | |
| 178 | tc->rcv_wnd = clib_min (wnd, TCP_WND_MAX << tc->rcv_wscale); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | /** |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 182 | * Compute and return window to advertise, scaled as per RFC1323 |
| 183 | */ |
| 184 | static u32 |
| 185 | tcp_window_to_advertise (tcp_connection_t * tc, tcp_state_t state) |
| 186 | { |
| 187 | if (state < TCP_STATE_ESTABLISHED) |
| 188 | return tcp_initial_window_to_advertise (tc); |
| 189 | |
| 190 | tcp_update_rcv_wnd (tc); |
| 191 | |
| 192 | if (tc->rcv_wnd == 0) |
| 193 | { |
| 194 | tc->flags |= TCP_CONN_SENT_RCV_WND0; |
| 195 | } |
| 196 | else |
| 197 | { |
| 198 | tc->flags &= ~TCP_CONN_SENT_RCV_WND0; |
| 199 | } |
| 200 | |
| 201 | return tc->rcv_wnd >> tc->rcv_wscale; |
| 202 | } |
| 203 | |
| 204 | /** |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 205 | * Write TCP options to segment. |
| 206 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 207 | static u32 |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 208 | tcp_options_write (u8 * data, tcp_options_t * opts) |
| 209 | { |
| 210 | u32 opts_len = 0; |
| 211 | u32 buf, seq_len = 4; |
| 212 | |
| 213 | if (tcp_opts_mss (opts)) |
| 214 | { |
| 215 | *data++ = TCP_OPTION_MSS; |
| 216 | *data++ = TCP_OPTION_LEN_MSS; |
| 217 | buf = clib_host_to_net_u16 (opts->mss); |
| 218 | clib_memcpy (data, &buf, sizeof (opts->mss)); |
| 219 | data += sizeof (opts->mss); |
| 220 | opts_len += TCP_OPTION_LEN_MSS; |
| 221 | } |
| 222 | |
| 223 | if (tcp_opts_wscale (opts)) |
| 224 | { |
| 225 | *data++ = TCP_OPTION_WINDOW_SCALE; |
| 226 | *data++ = TCP_OPTION_LEN_WINDOW_SCALE; |
| 227 | *data++ = opts->wscale; |
| 228 | opts_len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 229 | } |
| 230 | |
| 231 | if (tcp_opts_sack_permitted (opts)) |
| 232 | { |
| 233 | *data++ = TCP_OPTION_SACK_PERMITTED; |
| 234 | *data++ = TCP_OPTION_LEN_SACK_PERMITTED; |
| 235 | opts_len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 236 | } |
| 237 | |
| 238 | if (tcp_opts_tstamp (opts)) |
| 239 | { |
| 240 | *data++ = TCP_OPTION_TIMESTAMP; |
| 241 | *data++ = TCP_OPTION_LEN_TIMESTAMP; |
| 242 | buf = clib_host_to_net_u32 (opts->tsval); |
| 243 | clib_memcpy (data, &buf, sizeof (opts->tsval)); |
| 244 | data += sizeof (opts->tsval); |
| 245 | buf = clib_host_to_net_u32 (opts->tsecr); |
| 246 | clib_memcpy (data, &buf, sizeof (opts->tsecr)); |
| 247 | data += sizeof (opts->tsecr); |
| 248 | opts_len += TCP_OPTION_LEN_TIMESTAMP; |
| 249 | } |
| 250 | |
| 251 | if (tcp_opts_sack (opts)) |
| 252 | { |
| 253 | int i; |
| 254 | u32 n_sack_blocks = clib_min (vec_len (opts->sacks), |
| 255 | TCP_OPTS_MAX_SACK_BLOCKS); |
| 256 | |
| 257 | if (n_sack_blocks != 0) |
| 258 | { |
| 259 | *data++ = TCP_OPTION_SACK_BLOCK; |
| 260 | *data++ = 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; |
| 261 | for (i = 0; i < n_sack_blocks; i++) |
| 262 | { |
| 263 | buf = clib_host_to_net_u32 (opts->sacks[i].start); |
| 264 | clib_memcpy (data, &buf, seq_len); |
| 265 | data += seq_len; |
| 266 | buf = clib_host_to_net_u32 (opts->sacks[i].end); |
| 267 | clib_memcpy (data, &buf, seq_len); |
| 268 | data += seq_len; |
| 269 | } |
| 270 | opts_len += 2 + n_sack_blocks * TCP_OPTION_LEN_SACK_BLOCK; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /* Terminate TCP options */ |
| 275 | if (opts_len % 4) |
| 276 | { |
| 277 | *data++ = TCP_OPTION_EOL; |
| 278 | opts_len += TCP_OPTION_LEN_EOL; |
| 279 | } |
| 280 | |
| 281 | /* Pad with zeroes to a u32 boundary */ |
| 282 | while (opts_len % 4) |
| 283 | { |
| 284 | *data++ = TCP_OPTION_NOOP; |
| 285 | opts_len += TCP_OPTION_LEN_NOOP; |
| 286 | } |
| 287 | return opts_len; |
| 288 | } |
| 289 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 290 | static int |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 291 | tcp_make_syn_options (tcp_options_t * opts, u8 wnd_scale) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 292 | { |
| 293 | u8 len = 0; |
| 294 | |
| 295 | opts->flags |= TCP_OPTS_FLAG_MSS; |
| 296 | opts->mss = dummy_mtu; /*XXX discover that */ |
| 297 | len += TCP_OPTION_LEN_MSS; |
| 298 | |
| 299 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 300 | opts->wscale = wnd_scale; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 301 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 302 | |
| 303 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 304 | opts->tsval = tcp_time_now (); |
| 305 | opts->tsecr = 0; |
| 306 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 307 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 308 | if (TCP_USE_SACKS) |
| 309 | { |
| 310 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 311 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 312 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 313 | |
| 314 | /* Align to needed boundary */ |
| 315 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 316 | return len; |
| 317 | } |
| 318 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 319 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 320 | tcp_make_synack_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 321 | { |
| 322 | u8 len = 0; |
| 323 | |
| 324 | opts->flags |= TCP_OPTS_FLAG_MSS; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 325 | opts->mss = tc->mss; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 326 | len += TCP_OPTION_LEN_MSS; |
| 327 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 328 | if (tcp_opts_wscale (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 329 | { |
| 330 | opts->flags |= TCP_OPTS_FLAG_WSCALE; |
| 331 | opts->wscale = tc->rcv_wscale; |
| 332 | len += TCP_OPTION_LEN_WINDOW_SCALE; |
| 333 | } |
| 334 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 335 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 336 | { |
| 337 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
| 338 | opts->tsval = tcp_time_now (); |
| 339 | opts->tsecr = tc->tsval_recent; |
| 340 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 341 | } |
| 342 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 343 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 344 | { |
| 345 | opts->flags |= TCP_OPTS_FLAG_SACK_PERMITTED; |
| 346 | len += TCP_OPTION_LEN_SACK_PERMITTED; |
| 347 | } |
| 348 | |
| 349 | /* Align to needed boundary */ |
| 350 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 351 | return len; |
| 352 | } |
| 353 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 354 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 355 | tcp_make_established_options (tcp_connection_t * tc, tcp_options_t * opts) |
| 356 | { |
| 357 | u8 len = 0; |
| 358 | |
| 359 | opts->flags = 0; |
| 360 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 361 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 362 | { |
| 363 | opts->flags |= TCP_OPTS_FLAG_TSTAMP; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 364 | opts->tsval = tcp_time_now_w_thread (tc->c_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 365 | opts->tsecr = tc->tsval_recent; |
| 366 | len += TCP_OPTION_LEN_TIMESTAMP; |
| 367 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 368 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 369 | { |
| 370 | if (vec_len (tc->snd_sacks)) |
| 371 | { |
| 372 | opts->flags |= TCP_OPTS_FLAG_SACK; |
| 373 | opts->sacks = tc->snd_sacks; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 374 | opts->n_sack_blocks = clib_min (vec_len (tc->snd_sacks), |
| 375 | TCP_OPTS_MAX_SACK_BLOCKS); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 376 | len += 2 + TCP_OPTION_LEN_SACK_BLOCK * opts->n_sack_blocks; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | /* Align to needed boundary */ |
| 381 | len += (TCP_OPTS_ALIGN - len % TCP_OPTS_ALIGN) % TCP_OPTS_ALIGN; |
| 382 | return len; |
| 383 | } |
| 384 | |
| 385 | always_inline int |
| 386 | tcp_make_options (tcp_connection_t * tc, tcp_options_t * opts, |
| 387 | tcp_state_t state) |
| 388 | { |
| 389 | switch (state) |
| 390 | { |
| 391 | case TCP_STATE_ESTABLISHED: |
| 392 | case TCP_STATE_FIN_WAIT_1: |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 393 | case TCP_STATE_CLOSED: |
Florin Coras | 25579b4 | 2018-06-06 17:55:02 -0700 | [diff] [blame] | 394 | case TCP_STATE_CLOSE_WAIT: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 395 | return tcp_make_established_options (tc, opts); |
| 396 | case TCP_STATE_SYN_RCVD: |
| 397 | return tcp_make_synack_options (tc, opts); |
| 398 | case TCP_STATE_SYN_SENT: |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 399 | return tcp_make_syn_options (opts, tc->rcv_wscale); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 400 | default: |
Florin Coras | 371ca50 | 2018-02-21 12:07:41 -0800 | [diff] [blame] | 401 | clib_warning ("State not handled! %d", state); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 402 | return 0; |
| 403 | } |
| 404 | } |
| 405 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 406 | /** |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 407 | * Update burst send vars |
| 408 | * |
| 409 | * - Updates snd_mss to reflect the effective segment size that we can send |
| 410 | * by taking into account all TCP options, including SACKs. |
| 411 | * - Cache 'on the wire' options for reuse |
| 412 | * - Updates receive window which can be reused for a burst. |
| 413 | * |
| 414 | * This should *only* be called when doing bursts |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 415 | */ |
| 416 | void |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 417 | tcp_update_burst_snd_vars (tcp_connection_t * tc) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 418 | { |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 419 | tcp_main_t *tm = &tcp_main; |
| 420 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 421 | /* Compute options to be used for connection. These may be reused when |
| 422 | * sending data or to compute the effective mss (snd_mss) */ |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 423 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, |
| 424 | TCP_STATE_ESTABLISHED); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 425 | |
| 426 | /* XXX check if MTU has been updated */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 427 | 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] | 428 | ASSERT (tc->snd_mss > 0); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 429 | |
| 430 | tcp_options_write (tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 431 | &tc->snd_opts); |
| 432 | |
| 433 | tcp_update_rcv_wnd (tc); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 434 | } |
| 435 | |
| 436 | void |
| 437 | tcp_init_mss (tcp_connection_t * tc) |
| 438 | { |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 439 | u16 default_min_mss = 536; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 440 | tcp_update_rcv_mss (tc); |
| 441 | |
| 442 | /* TODO cache mss and consider PMTU discovery */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 443 | tc->snd_mss = clib_min (tc->rcv_opts.mss, tc->mss); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 444 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 445 | if (tc->snd_mss < 45) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 446 | { |
| 447 | clib_warning ("snd mss is 0"); |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 448 | /* Assume that at least the min default mss works */ |
| 449 | tc->snd_mss = default_min_mss; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 450 | tc->rcv_opts.mss = default_min_mss; |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | /* We should have enough space for 40 bytes of options */ |
| 454 | ASSERT (tc->snd_mss > 45); |
| 455 | |
| 456 | /* If we use timestamp option, account for it */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 457 | if (tcp_opts_tstamp (&tc->rcv_opts)) |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 458 | tc->snd_mss -= TCP_OPTION_LEN_TIMESTAMP; |
| 459 | } |
| 460 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 461 | static int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 462 | tcp_alloc_tx_buffers (tcp_worker_ctx_t * wrk, u16 * n_bufs, u32 wanted) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 463 | { |
Florin Coras | 2f9b0c0 | 2017-09-11 20:54:15 -0400 | [diff] [blame] | 464 | vlib_main_t *vm = vlib_get_main (); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 465 | u32 n_alloc; |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 466 | |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 467 | ASSERT (wanted > *n_bufs); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 468 | vec_validate_aligned (wrk->tx_buffers, wanted - 1, CLIB_CACHE_LINE_BYTES); |
| 469 | n_alloc = vlib_buffer_alloc (vm, &wrk->tx_buffers[*n_bufs], |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 470 | wanted - *n_bufs); |
| 471 | *n_bufs += n_alloc; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 472 | _vec_len (wrk->tx_buffers) = *n_bufs; |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 473 | return n_alloc; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 474 | } |
| 475 | |
| 476 | always_inline int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 477 | tcp_get_free_buffer_index (tcp_worker_ctx_t * wrk, u32 * bidx) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 478 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 479 | u16 n_bufs = vec_len (wrk->tx_buffers); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 480 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 481 | TCP_DBG_BUFFER_ALLOC_MAYBE_FAIL (wrk->vm->thread_index); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 482 | |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 483 | if (PREDICT_FALSE (!n_bufs)) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 484 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 485 | if (!tcp_alloc_tx_buffers (wrk, &n_bufs, VLIB_FRAME_SIZE)) |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 486 | { |
| 487 | *bidx = ~0; |
| 488 | return -1; |
| 489 | } |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 490 | } |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 491 | *bidx = wrk->tx_buffers[--n_bufs]; |
| 492 | _vec_len (wrk->tx_buffers) = n_bufs; |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 493 | return 0; |
| 494 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 495 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 496 | static void * |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 497 | tcp_reuse_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 498 | { |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 499 | if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| 500 | vlib_buffer_free_one (vm, b->next_buffer); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 501 | /* Zero all flags but free list index and trace flag */ |
| 502 | b->flags &= VLIB_BUFFER_NEXT_PRESENT - 1; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 503 | b->current_data = 0; |
| 504 | b->current_length = 0; |
| 505 | b->total_length_not_including_first_buffer = 0; |
| 506 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 507 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 508 | /* Leave enough space for headers */ |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 509 | return vlib_buffer_make_headroom (b, MAX_HDRS_LEN); |
| 510 | } |
| 511 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 512 | static void * |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 513 | tcp_init_buffer (vlib_main_t * vm, vlib_buffer_t * b) |
| 514 | { |
| 515 | ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0); |
Damjan Marion | dac0352 | 2018-02-01 15:30:13 +0100 | [diff] [blame] | 516 | b->flags &= VLIB_BUFFER_NON_DEFAULT_FREELIST; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 517 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 518 | b->total_length_not_including_first_buffer = 0; |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 519 | b->current_data = 0; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 520 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 521 | VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 522 | /* Leave enough space for headers */ |
| 523 | return vlib_buffer_make_headroom (b, MAX_HDRS_LEN); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 524 | } |
| 525 | |
| 526 | /** |
| 527 | * Prepare ACK |
| 528 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 529 | static void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 530 | tcp_make_ack_i (tcp_connection_t * tc, vlib_buffer_t * b, tcp_state_t state, |
| 531 | u8 flags) |
| 532 | { |
| 533 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 534 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 535 | tcp_header_t *th; |
| 536 | u16 wnd; |
| 537 | |
| 538 | wnd = tcp_window_to_advertise (tc, state); |
| 539 | |
| 540 | /* Make and write options */ |
| 541 | tcp_opts_len = tcp_make_established_options (tc, snd_opts); |
| 542 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 543 | |
| 544 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 545 | tc->rcv_nxt, tcp_hdr_opts_len, flags, wnd); |
| 546 | |
| 547 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 548 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * Convert buffer to ACK |
| 553 | */ |
| 554 | void |
| 555 | tcp_make_ack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 556 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 557 | vlib_main_t *vm = vlib_get_main (); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 558 | |
| 559 | tcp_reuse_buffer (vm, b); |
| 560 | tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, TCP_FLAG_ACK); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 561 | TCP_EVT_DBG (TCP_EVT_ACK_SENT, tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 562 | vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK; |
| 563 | tc->rcv_las = tc->rcv_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | /** |
| 567 | * Convert buffer to FIN-ACK |
| 568 | */ |
| 569 | void |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 570 | tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 571 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 572 | vlib_main_t *vm = vlib_get_main (); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 573 | u8 flags = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 574 | |
| 575 | tcp_reuse_buffer (vm, b); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 576 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 577 | flags = TCP_FLAG_FIN | TCP_FLAG_ACK; |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 578 | tcp_make_ack_i (tc, b, TCP_STATE_ESTABLISHED, flags); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 579 | |
| 580 | /* Reset flags, make sure ack is sent */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 581 | vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 582 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 583 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 584 | /** |
| 585 | * Convert buffer to SYN |
| 586 | */ |
| 587 | void |
| 588 | tcp_make_syn (tcp_connection_t * tc, vlib_buffer_t * b) |
| 589 | { |
| 590 | u8 tcp_hdr_opts_len, tcp_opts_len; |
| 591 | tcp_header_t *th; |
| 592 | u16 initial_wnd; |
| 593 | tcp_options_t snd_opts; |
| 594 | |
| 595 | initial_wnd = tcp_initial_window_to_advertise (tc); |
| 596 | |
| 597 | /* Make and write options */ |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 598 | clib_memset (&snd_opts, 0, sizeof (snd_opts)); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 599 | tcp_opts_len = tcp_make_syn_options (&snd_opts, tc->rcv_wscale); |
| 600 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 601 | |
| 602 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 603 | tc->rcv_nxt, tcp_hdr_opts_len, TCP_FLAG_SYN, |
| 604 | initial_wnd); |
| 605 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
| 606 | tcp_options_write ((u8 *) (th + 1), &snd_opts); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 607 | } |
| 608 | |
| 609 | /** |
| 610 | * Convert buffer to SYN-ACK |
| 611 | */ |
| 612 | void |
| 613 | tcp_make_synack (tcp_connection_t * tc, vlib_buffer_t * b) |
| 614 | { |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 615 | vlib_main_t *vm = vlib_get_main (); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 616 | tcp_options_t _snd_opts, *snd_opts = &_snd_opts; |
| 617 | u8 tcp_opts_len, tcp_hdr_opts_len; |
| 618 | tcp_header_t *th; |
| 619 | u16 initial_wnd; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 620 | |
Dave Barach | b7b9299 | 2018-10-17 10:38:51 -0400 | [diff] [blame] | 621 | clib_memset (snd_opts, 0, sizeof (*snd_opts)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 622 | tcp_reuse_buffer (vm, b); |
| 623 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 624 | initial_wnd = tcp_initial_window_to_advertise (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 625 | tcp_opts_len = tcp_make_synack_options (tc, snd_opts); |
| 626 | tcp_hdr_opts_len = tcp_opts_len + sizeof (tcp_header_t); |
| 627 | |
| 628 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->iss, |
| 629 | tc->rcv_nxt, tcp_hdr_opts_len, |
| 630 | TCP_FLAG_SYN | TCP_FLAG_ACK, initial_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 631 | tcp_options_write ((u8 *) (th + 1), snd_opts); |
| 632 | |
| 633 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
| 634 | vnet_buffer (b)->tcp.flags = TCP_BUF_FLAG_ACK; |
| 635 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 636 | /* Init retransmit timer. Use update instead of set because of |
| 637 | * retransmissions */ |
| 638 | tcp_retransmit_timer_force_update (tc); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 639 | TCP_EVT_DBG (TCP_EVT_SYNACK_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | always_inline void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 643 | tcp_enqueue_to_ip_lookup_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 644 | u8 is_ip4, u32 fib_index, u8 flush) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 645 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 646 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 647 | u32 *to_next, next_index; |
| 648 | vlib_frame_t *f; |
| 649 | |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 650 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 651 | b->error = 0; |
| 652 | |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 653 | vnet_buffer (b)->sw_if_index[VLIB_TX] = fib_index; |
| 654 | vnet_buffer (b)->sw_if_index[VLIB_RX] = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 655 | |
| 656 | /* Send to IP lookup */ |
| 657 | next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 658 | tcp_trajectory_add_start (b, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 659 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 660 | f = wrk->ip_lookup_tx_frames[!is_ip4]; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 661 | if (!f) |
| 662 | { |
| 663 | f = vlib_get_frame_to_node (vm, next_index); |
| 664 | ASSERT (f); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 665 | wrk->ip_lookup_tx_frames[!is_ip4] = f; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 666 | } |
| 667 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 668 | to_next = vlib_frame_vector_args (f); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 669 | to_next[f->n_vectors] = bi; |
| 670 | f->n_vectors += 1; |
| 671 | if (flush || f->n_vectors == VLIB_FRAME_SIZE) |
| 672 | { |
| 673 | vlib_put_frame_to_node (vm, next_index, f); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 674 | wrk->ip_lookup_tx_frames[!is_ip4] = 0; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 675 | } |
| 676 | } |
| 677 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 678 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 679 | tcp_enqueue_to_ip_lookup_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, |
| 680 | u32 bi, u8 is_ip4, u32 fib_index) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 681 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 682 | tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 1); |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 683 | } |
| 684 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 685 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 686 | tcp_enqueue_to_ip_lookup (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 687 | u8 is_ip4, u32 fib_index) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 688 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 689 | tcp_enqueue_to_ip_lookup_i (wrk, b, bi, is_ip4, fib_index, 0); |
| 690 | if (wrk->vm->thread_index == 0 && vlib_num_workers ()) |
| 691 | session_flush_frames_main_thread (wrk->vm); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 692 | } |
| 693 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 694 | always_inline void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 695 | tcp_enqueue_to_output_i (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 696 | u8 is_ip4, u8 flush) |
| 697 | { |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 698 | u32 *to_next, next_index; |
| 699 | vlib_frame_t *f; |
| 700 | |
| 701 | b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
| 702 | b->error = 0; |
| 703 | |
| 704 | /* Decide where to send the packet */ |
| 705 | next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index; |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 706 | tcp_trajectory_add_start (b, 2); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 707 | |
| 708 | /* Get frame to v4/6 output node */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 709 | f = wrk->tx_frames[!is_ip4]; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 710 | if (!f) |
| 711 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 712 | f = vlib_get_frame_to_node (wrk->vm, next_index); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 713 | ASSERT (f); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 714 | wrk->tx_frames[!is_ip4] = f; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 715 | } |
| 716 | to_next = vlib_frame_vector_args (f); |
| 717 | to_next[f->n_vectors] = bi; |
| 718 | f->n_vectors += 1; |
| 719 | if (flush || f->n_vectors == VLIB_FRAME_SIZE) |
| 720 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 721 | vlib_put_frame_to_node (wrk->vm, next_index, f); |
| 722 | wrk->tx_frames[!is_ip4] = 0; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 723 | } |
| 724 | } |
| 725 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 726 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 727 | tcp_enqueue_to_output (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
| 728 | u8 is_ip4) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 729 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 730 | tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 0); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 731 | } |
| 732 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 733 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 734 | tcp_enqueue_to_output_now (tcp_worker_ctx_t * wrk, vlib_buffer_t * b, u32 bi, |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 735 | u8 is_ip4) |
| 736 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 737 | tcp_enqueue_to_output_i (wrk, b, bi, is_ip4, 1); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 738 | } |
| 739 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 740 | static int |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 741 | tcp_make_reset_in_place (vlib_main_t * vm, vlib_buffer_t * b0, |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 742 | tcp_state_t state, u8 thread_index, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 743 | { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 744 | ip4_header_t *ih4; |
| 745 | ip6_header_t *ih6; |
| 746 | tcp_header_t *th0; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 747 | ip4_address_t src_ip40, dst_ip40; |
| 748 | ip6_address_t src_ip60, dst_ip60; |
| 749 | u16 src_port, dst_port; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 750 | u32 tmp; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 751 | u32 seq, ack; |
| 752 | u8 flags; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 753 | |
| 754 | /* Find IP and TCP headers */ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 755 | th0 = tcp_buffer_hdr (b0); |
| 756 | |
| 757 | /* Save src and dst ip */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 758 | if (is_ip4) |
| 759 | { |
| 760 | ih4 = vlib_buffer_get_current (b0); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 761 | ASSERT ((ih4->ip_version_and_header_length & 0xF0) == 0x40); |
| 762 | src_ip40.as_u32 = ih4->src_address.as_u32; |
| 763 | dst_ip40.as_u32 = ih4->dst_address.as_u32; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 764 | } |
| 765 | else |
| 766 | { |
| 767 | ih6 = vlib_buffer_get_current (b0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 768 | ASSERT ((ih6->ip_version_traffic_class_and_flow_label & 0xF0) == 0x60); |
| 769 | clib_memcpy (&src_ip60, &ih6->src_address, sizeof (ip6_address_t)); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 770 | clib_memcpy (&dst_ip60, &ih6->dst_address, sizeof (ip6_address_t)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 771 | } |
| 772 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 773 | src_port = th0->src_port; |
| 774 | dst_port = th0->dst_port; |
| 775 | |
| 776 | /* Try to determine what/why we're actually resetting */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 777 | if (state == TCP_STATE_CLOSED) |
| 778 | { |
| 779 | if (!tcp_syn (th0)) |
| 780 | return -1; |
| 781 | |
| 782 | tmp = clib_net_to_host_u32 (th0->seq_number); |
| 783 | |
| 784 | /* Got a SYN for no listener. */ |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 785 | flags = TCP_FLAG_RST | TCP_FLAG_ACK; |
| 786 | ack = clib_host_to_net_u32 (tmp + 1); |
| 787 | seq = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 788 | } |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 789 | else |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 790 | { |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 791 | flags = TCP_FLAG_RST; |
| 792 | seq = th0->ack_number; |
| 793 | ack = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 794 | } |
| 795 | |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 796 | tcp_reuse_buffer (vm, b0); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 797 | tcp_trajectory_add_start (b0, 4); |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 798 | th0 = vlib_buffer_push_tcp_net_order (b0, dst_port, src_port, seq, ack, |
| 799 | sizeof (tcp_header_t), flags, 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 800 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 801 | if (is_ip4) |
| 802 | { |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 803 | ih4 = vlib_buffer_push_ip4 (vm, b0, &dst_ip40, &src_ip40, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 804 | IP_PROTOCOL_TCP, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 805 | th0->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ih4); |
| 806 | } |
| 807 | else |
| 808 | { |
| 809 | int bogus = ~0; |
Florin Coras | dc629cd | 2017-05-09 00:52:37 -0700 | [diff] [blame] | 810 | ih6 = vlib_buffer_push_ip6 (vm, b0, &dst_ip60, &src_ip60, |
| 811 | IP_PROTOCOL_TCP); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 812 | th0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ih6, &bogus); |
| 813 | ASSERT (!bogus); |
| 814 | } |
| 815 | |
| 816 | return 0; |
| 817 | } |
| 818 | |
| 819 | /** |
| 820 | * Send reset without reusing existing buffer |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 821 | * |
| 822 | * It extracts connection info out of original packet |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 823 | */ |
| 824 | void |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 825 | tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, u8 is_ip4) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 826 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 827 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 828 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 829 | vlib_buffer_t *b; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 830 | u32 bi, sw_if_index, fib_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 831 | u8 tcp_hdr_len, flags = 0; |
| 832 | tcp_header_t *th, *pkt_th; |
| 833 | u32 seq, ack; |
| 834 | ip4_header_t *ih4, *pkt_ih4; |
| 835 | ip6_header_t *ih6, *pkt_ih6; |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 836 | fib_protocol_t fib_proto; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 837 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 838 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 839 | return; |
| 840 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 841 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 56b39f6 | 2018-03-27 17:29:32 -0700 | [diff] [blame] | 842 | sw_if_index = vnet_buffer (pkt)->sw_if_index[VLIB_RX]; |
| 843 | fib_proto = is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; |
| 844 | 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] | 845 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 846 | |
| 847 | /* Make and write options */ |
| 848 | tcp_hdr_len = sizeof (tcp_header_t); |
| 849 | |
| 850 | if (is_ip4) |
| 851 | { |
| 852 | pkt_ih4 = vlib_buffer_get_current (pkt); |
| 853 | pkt_th = ip4_next_header (pkt_ih4); |
| 854 | } |
| 855 | else |
| 856 | { |
| 857 | pkt_ih6 = vlib_buffer_get_current (pkt); |
| 858 | pkt_th = ip6_next_header (pkt_ih6); |
| 859 | } |
| 860 | |
| 861 | if (tcp_ack (pkt_th)) |
| 862 | { |
| 863 | flags = TCP_FLAG_RST; |
| 864 | seq = pkt_th->ack_number; |
Florin Coras | 776f3d8 | 2018-11-02 08:23:58 -0700 | [diff] [blame] | 865 | ack = (tc->state >= TCP_STATE_SYN_RCVD) ? tc->rcv_nxt : 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 866 | } |
| 867 | else |
| 868 | { |
| 869 | flags = TCP_FLAG_RST | TCP_FLAG_ACK; |
| 870 | seq = 0; |
| 871 | ack = clib_host_to_net_u32 (vnet_buffer (pkt)->tcp.seq_end); |
| 872 | } |
| 873 | |
| 874 | th = vlib_buffer_push_tcp_net_order (b, pkt_th->dst_port, pkt_th->src_port, |
| 875 | seq, ack, tcp_hdr_len, flags, 0); |
| 876 | |
| 877 | /* Swap src and dst ip */ |
| 878 | if (is_ip4) |
| 879 | { |
| 880 | ASSERT ((pkt_ih4->ip_version_and_header_length & 0xF0) == 0x40); |
| 881 | ih4 = vlib_buffer_push_ip4 (vm, b, &pkt_ih4->dst_address, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 882 | &pkt_ih4->src_address, IP_PROTOCOL_TCP, 1); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 883 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
| 884 | } |
| 885 | else |
| 886 | { |
| 887 | int bogus = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 888 | ASSERT ((pkt_ih6->ip_version_traffic_class_and_flow_label & 0xF0) == |
| 889 | 0x60); |
root | c9d1c5b | 2017-08-15 12:58:31 -0400 | [diff] [blame] | 890 | ih6 = vlib_buffer_push_ip6 (vm, b, &pkt_ih6->dst_address, |
| 891 | &pkt_ih6->src_address, IP_PROTOCOL_TCP); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 892 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
| 893 | ASSERT (!bogus); |
| 894 | } |
| 895 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 896 | tcp_enqueue_to_ip_lookup_now (wrk, b, bi, is_ip4, fib_index); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 897 | TCP_EVT_DBG (TCP_EVT_RST_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 898 | } |
| 899 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 900 | /** |
| 901 | * Build and set reset packet for connection |
| 902 | */ |
| 903 | void |
| 904 | tcp_send_reset (tcp_connection_t * tc) |
| 905 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 906 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 907 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 908 | vlib_buffer_t *b; |
| 909 | u32 bi; |
| 910 | tcp_header_t *th; |
| 911 | u16 tcp_hdr_opts_len, advertise_wnd, opts_write_len; |
| 912 | u8 flags; |
| 913 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 914 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 915 | return; |
| 916 | b = vlib_get_buffer (vm, bi); |
| 917 | tcp_init_buffer (vm, b); |
| 918 | |
| 919 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 920 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
| 921 | advertise_wnd = tcp_window_to_advertise (tc, TCP_STATE_ESTABLISHED); |
| 922 | flags = TCP_FLAG_RST; |
| 923 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 924 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 925 | advertise_wnd); |
| 926 | opts_write_len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
| 927 | ASSERT (opts_write_len == tc->snd_opts_len); |
| 928 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 929 | if (tc->c_is_ip4) |
| 930 | { |
| 931 | ip4_header_t *ih4; |
| 932 | ih4 = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip.ip4, |
| 933 | &tc->c_rmt_ip.ip4, IP_PROTOCOL_TCP, 0); |
| 934 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih4); |
| 935 | } |
| 936 | else |
| 937 | { |
| 938 | int bogus = ~0; |
| 939 | ip6_header_t *ih6; |
| 940 | ih6 = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip.ip6, |
| 941 | &tc->c_rmt_ip.ip6, IP_PROTOCOL_TCP); |
| 942 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih6, &bogus); |
| 943 | ASSERT (!bogus); |
| 944 | } |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 945 | tcp_enqueue_to_ip_lookup_now (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 946 | TCP_EVT_DBG (TCP_EVT_RST_SENT, tc); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 947 | } |
| 948 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 949 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 950 | tcp_push_ip_hdr (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 951 | vlib_buffer_t * b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 952 | { |
| 953 | tcp_header_t *th = vlib_buffer_get_current (b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 954 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 955 | if (tc->c_is_ip4) |
| 956 | { |
| 957 | ip4_header_t *ih; |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 958 | ih = vlib_buffer_push_ip4 (vm, b, &tc->c_lcl_ip4, |
Florin Coras | fdbc382 | 2017-07-27 00:34:12 -0700 | [diff] [blame] | 959 | &tc->c_rmt_ip4, IP_PROTOCOL_TCP, 1); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 960 | th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ih); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 961 | } |
| 962 | else |
| 963 | { |
| 964 | ip6_header_t *ih; |
| 965 | int bogus = ~0; |
| 966 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 967 | ih = vlib_buffer_push_ip6 (vm, b, &tc->c_lcl_ip6, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 968 | &tc->c_rmt_ip6, IP_PROTOCOL_TCP); |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 969 | th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ih, &bogus); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 970 | ASSERT (!bogus); |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | /** |
| 975 | * Send SYN |
| 976 | * |
| 977 | * Builds a SYN packet for a half-open connection and sends it to ipx_lookup. |
| 978 | * The packet is not forwarded through tcpx_output to avoid doing lookups |
| 979 | * in the half_open pool. |
| 980 | */ |
| 981 | void |
| 982 | tcp_send_syn (tcp_connection_t * tc) |
| 983 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 984 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 985 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 986 | vlib_buffer_t *b; |
| 987 | u32 bi; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 988 | |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 989 | /* |
| 990 | * Setup retransmit and establish timers before requesting buffer |
| 991 | * such that we can return if we've ran out. |
| 992 | */ |
| 993 | tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME); |
| 994 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, |
| 995 | tc->rto * TCP_TO_TIMER_TICK); |
| 996 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 997 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 998 | return; |
| 999 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1000 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1001 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1002 | tcp_make_syn (tc, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1003 | |
| 1004 | /* Measure RTT with this */ |
| 1005 | tc->rtt_ts = tcp_time_now (); |
| 1006 | tc->rtt_seq = tc->snd_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1007 | tc->rto_boff = 0; |
| 1008 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1009 | tcp_push_ip_hdr (wrk, tc, b); |
| 1010 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
Florin Coras | 6534b7a | 2017-07-18 05:38:03 -0400 | [diff] [blame] | 1011 | TCP_EVT_DBG (TCP_EVT_SYN_SENT, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1012 | } |
| 1013 | |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1014 | /** |
| 1015 | * Flush tx frame populated by retransmits and timer pops |
| 1016 | */ |
| 1017 | void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1018 | tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1019 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1020 | if (wrk->tx_frames[!is_ip4]) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1021 | { |
| 1022 | u32 next_index; |
| 1023 | next_index = is_ip4 ? tcp4_output_node.index : tcp6_output_node.index; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1024 | vlib_put_frame_to_node (wrk->vm, next_index, wrk->tx_frames[!is_ip4]); |
| 1025 | wrk->tx_frames[!is_ip4] = 0; |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1026 | } |
| 1027 | } |
| 1028 | |
| 1029 | /** |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1030 | * Flush ip lookup tx frames populated by timer pops |
| 1031 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1032 | static void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1033 | tcp_flush_frame_to_ip_lookup (tcp_worker_ctx_t * wrk, u8 is_ip4) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1034 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1035 | if (wrk->ip_lookup_tx_frames[!is_ip4]) |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1036 | { |
| 1037 | u32 next_index; |
| 1038 | next_index = is_ip4 ? ip4_lookup_node.index : ip6_lookup_node.index; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1039 | vlib_put_frame_to_node (wrk->vm, next_index, |
| 1040 | wrk->ip_lookup_tx_frames[!is_ip4]); |
| 1041 | wrk->ip_lookup_tx_frames[!is_ip4] = 0; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1042 | } |
| 1043 | } |
| 1044 | |
| 1045 | /** |
| 1046 | * Flush v4 and v6 tcp and ip-lookup tx frames for thread index |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1047 | */ |
| 1048 | void |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1049 | tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1050 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1051 | tcp_flush_frame_to_output (wrk, 1); |
| 1052 | tcp_flush_frame_to_output (wrk, 0); |
| 1053 | tcp_flush_frame_to_ip_lookup (wrk, 1); |
| 1054 | tcp_flush_frame_to_ip_lookup (wrk, 0); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1055 | } |
| 1056 | |
| 1057 | /** |
| 1058 | * Send FIN |
| 1059 | */ |
| 1060 | void |
| 1061 | tcp_send_fin (tcp_connection_t * tc) |
| 1062 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1063 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1064 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1065 | vlib_buffer_t *b; |
| 1066 | u32 bi; |
| 1067 | u8 fin_snt = 0; |
| 1068 | |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1069 | fin_snt = tc->flags & TCP_CONN_FINSNT; |
| 1070 | if (fin_snt) |
| 1071 | tc->snd_nxt = tc->snd_una; |
| 1072 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1073 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 1074 | { |
| 1075 | /* Out of buffers so program fin retransmit ASAP */ |
| 1076 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1); |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1077 | goto post_enqueue; |
Florin Coras | eb97e5f | 2018-10-15 21:35:42 -0700 | [diff] [blame] | 1078 | } |
| 1079 | |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1080 | tcp_retransmit_timer_force_update (tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1081 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1082 | tcp_init_buffer (vm, b); |
Florin Coras | d79b41e | 2017-03-04 05:37:52 -0800 | [diff] [blame] | 1083 | tcp_make_fin (tc, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1084 | tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | c977e7c | 2018-10-16 20:30:31 -0700 | [diff] [blame] | 1085 | TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc); |
| 1086 | |
| 1087 | post_enqueue: |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1088 | if (!fin_snt) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1089 | { |
| 1090 | tc->flags |= TCP_CONN_FINSNT; |
| 1091 | tc->flags &= ~TCP_CONN_FINPNDG; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1092 | /* Account for the FIN */ |
| 1093 | tc->snd_una_max += 1; |
| 1094 | tc->snd_nxt = tc->snd_una_max; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1095 | } |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1096 | else |
| 1097 | { |
| 1098 | tc->snd_nxt = tc->snd_una_max; |
| 1099 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1100 | } |
| 1101 | |
| 1102 | always_inline u8 |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1103 | tcp_make_state_flags (tcp_connection_t * tc, tcp_state_t next_state) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1104 | { |
| 1105 | switch (next_state) |
| 1106 | { |
| 1107 | case TCP_STATE_ESTABLISHED: |
Florin Coras | 00dfe54 | 2018-06-11 13:15:11 -0700 | [diff] [blame] | 1108 | case TCP_STATE_CLOSE_WAIT: |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1109 | return TCP_FLAG_ACK; |
| 1110 | case TCP_STATE_SYN_RCVD: |
| 1111 | return TCP_FLAG_SYN | TCP_FLAG_ACK; |
| 1112 | case TCP_STATE_SYN_SENT: |
| 1113 | return TCP_FLAG_SYN; |
| 1114 | case TCP_STATE_LAST_ACK: |
| 1115 | case TCP_STATE_FIN_WAIT_1: |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1116 | if (tc->snd_nxt + 1 < tc->snd_una_max) |
| 1117 | return TCP_FLAG_ACK; |
| 1118 | else |
| 1119 | return TCP_FLAG_FIN; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1120 | default: |
| 1121 | clib_warning ("Shouldn't be here!"); |
| 1122 | } |
| 1123 | return 0; |
| 1124 | } |
| 1125 | |
| 1126 | /** |
| 1127 | * Push TCP header and update connection variables |
| 1128 | */ |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1129 | always_inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1130 | tcp_push_hdr_i (tcp_connection_t * tc, vlib_buffer_t * b, |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1131 | tcp_state_t next_state, u8 compute_opts, u8 maybe_burst) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1132 | { |
| 1133 | u32 advertise_wnd, data_len; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1134 | u8 tcp_hdr_opts_len, flags; |
| 1135 | tcp_main_t *tm = &tcp_main; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1136 | tcp_header_t *th; |
| 1137 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1138 | data_len = b->current_length; |
| 1139 | if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| 1140 | data_len += b->total_length_not_including_first_buffer; |
| 1141 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1142 | vnet_buffer (b)->tcp.flags = 0; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1143 | vnet_buffer (b)->tcp.connection_index = tc->c_c_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1144 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1145 | if (compute_opts) |
| 1146 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 1147 | |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1148 | tcp_hdr_opts_len = tc->snd_opts_len + sizeof (tcp_header_t); |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1149 | |
| 1150 | if (maybe_burst) |
| 1151 | advertise_wnd = tc->rcv_wnd >> tc->rcv_wscale; |
| 1152 | else |
| 1153 | advertise_wnd = tcp_window_to_advertise (tc, next_state); |
| 1154 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1155 | flags = tcp_make_state_flags (tc, next_state); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1156 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1157 | th = vlib_buffer_push_tcp (b, tc->c_lcl_port, tc->c_rmt_port, tc->snd_nxt, |
| 1158 | tc->rcv_nxt, tcp_hdr_opts_len, flags, |
| 1159 | advertise_wnd); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1160 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1161 | if (maybe_burst) |
| 1162 | { |
| 1163 | clib_memcpy ((u8 *) (th + 1), |
| 1164 | tm->wrk_ctx[tc->c_thread_index].cached_opts, |
| 1165 | tc->snd_opts_len); |
| 1166 | } |
| 1167 | else |
| 1168 | { |
| 1169 | u8 len = tcp_options_write ((u8 *) (th + 1), &tc->snd_opts); |
| 1170 | ASSERT (len == tc->snd_opts_len); |
| 1171 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1172 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1173 | /* |
| 1174 | * Update connection variables |
| 1175 | */ |
| 1176 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1177 | tc->snd_nxt += data_len; |
Florin Coras | c28764f | 2017-04-26 00:08:42 -0700 | [diff] [blame] | 1178 | tc->rcv_las = tc->rcv_nxt; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1179 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 1180 | TCP_EVT_DBG (TCP_EVT_PKTIZE, tc); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1181 | } |
| 1182 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1183 | u32 |
| 1184 | tcp_push_header (tcp_connection_t * tc, vlib_buffer_t * b) |
| 1185 | { |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1186 | tcp_push_hdr_i (tc, b, TCP_STATE_ESTABLISHED, /* compute opts */ 0, |
| 1187 | /* burst */ 1); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1188 | tc->snd_una_max = tc->snd_nxt; |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1189 | ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd |
| 1190 | + tcp_fastrecovery_sent_1_smss (tc) * tc->snd_mss)); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1191 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
| 1192 | /* If not tracking an ACK, start tracking */ |
| 1193 | if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc)) |
| 1194 | { |
Florin Coras | d67f112 | 2018-05-21 17:47:40 -0700 | [diff] [blame] | 1195 | tc->rtt_ts = tcp_time_now_us (tc->c_thread_index); |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1196 | tc->rtt_seq = tc->snd_nxt; |
| 1197 | } |
| 1198 | if (PREDICT_FALSE (!tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT))) |
| 1199 | { |
| 1200 | tcp_retransmit_timer_set (tc); |
| 1201 | tc->rto_boff = 0; |
| 1202 | } |
| 1203 | tcp_trajectory_add_start (b, 3); |
| 1204 | return 0; |
| 1205 | } |
| 1206 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1207 | void |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1208 | tcp_send_ack (tcp_connection_t * tc) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1209 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1210 | tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index); |
| 1211 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1212 | vlib_buffer_t *b; |
| 1213 | u32 bi; |
| 1214 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1215 | /* Get buffer */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1216 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | 66b1131 | 2017-07-31 17:18:03 -0700 | [diff] [blame] | 1217 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1218 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1219 | tcp_init_buffer (vm, b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1220 | |
| 1221 | /* Fill in the ACK */ |
| 1222 | tcp_make_ack (tc, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1223 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1224 | } |
| 1225 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1226 | /** |
| 1227 | * Delayed ack timer handler |
| 1228 | * |
| 1229 | * Sends delayed ACK when timer expires |
| 1230 | */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1231 | void |
| 1232 | tcp_timer_delack_handler (u32 index) |
| 1233 | { |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 1234 | u32 thread_index = vlib_get_thread_index (); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1235 | tcp_connection_t *tc; |
| 1236 | |
| 1237 | tc = tcp_connection_get (index, thread_index); |
| 1238 | tc->timers[TCP_TIMER_DELACK] = TCP_TIMER_HANDLE_INVALID; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1239 | tcp_send_ack (tc); |
| 1240 | } |
| 1241 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1242 | /** |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1243 | * Allocate a new buffer and build a new tcp segment |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1244 | * |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1245 | * @param wrk tcp worker |
| 1246 | * @param tc connection for which the segment will be allocated |
| 1247 | * @param offset offset of the first byte in the tx fifo |
| 1248 | * @param max_deq_byte segment size |
| 1249 | * @param[out] b pointer to buffer allocated |
| 1250 | * |
| 1251 | * @return the number of bytes in the segment or 0 if buffer cannot be |
| 1252 | * allocated or no data available |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1253 | */ |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1254 | static int |
| 1255 | tcp_prepare_segment (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1256 | u32 offset, u32 max_deq_bytes, vlib_buffer_t ** b) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1257 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1258 | u32 bytes_per_buffer = vnet_get_tcp_main ()->bytes_per_buffer; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1259 | u32 bi, seg_size; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1260 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1261 | int n_bytes = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1262 | u8 *data; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1263 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1264 | seg_size = max_deq_bytes + MAX_HDRS_LEN; |
| 1265 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1266 | /* |
| 1267 | * Prepare options |
| 1268 | */ |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1269 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
| 1270 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1271 | /* |
| 1272 | * Allocate and fill in buffer(s) |
| 1273 | */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1274 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1275 | /* Easy case, buffer size greater than mss */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1276 | if (PREDICT_TRUE (seg_size <= bytes_per_buffer)) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1277 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1278 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1279 | return 0; |
| 1280 | *b = vlib_get_buffer (vm, bi); |
| 1281 | data = tcp_init_buffer (vm, *b); |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1282 | n_bytes = stream_session_peek_bytes (&tc->connection, data, offset, |
| 1283 | max_deq_bytes); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1284 | ASSERT (n_bytes == max_deq_bytes); |
| 1285 | b[0]->current_length = n_bytes; |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1286 | tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0); |
Florin Coras | 208daa1 | 2018-07-02 01:30:51 -0700 | [diff] [blame] | 1287 | if (seq_gt (tc->snd_nxt, tc->snd_una_max)) |
| 1288 | tc->snd_una_max = tc->snd_nxt; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1289 | } |
| 1290 | /* Split mss into multiple buffers */ |
| 1291 | else |
| 1292 | { |
| 1293 | u32 chain_bi = ~0, n_bufs_per_seg; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1294 | u16 n_peeked, len_to_deq, available_bufs; |
| 1295 | vlib_buffer_t *chain_b, *prev_b; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1296 | int i; |
| 1297 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1298 | /* Make sure we have enough buffers */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1299 | n_bufs_per_seg = ceil ((double) seg_size / bytes_per_buffer); |
| 1300 | available_bufs = vec_len (wrk->tx_buffers); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1301 | if (n_bufs_per_seg > available_bufs) |
| 1302 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1303 | tcp_alloc_tx_buffers (wrk, &available_bufs, VLIB_FRAME_SIZE); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1304 | if (n_bufs_per_seg > available_bufs) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1305 | { |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1306 | *b = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1307 | return 0; |
| 1308 | } |
| 1309 | } |
| 1310 | |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame^] | 1311 | (void) tcp_get_free_buffer_index (wrk, &bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1312 | ASSERT (bi != (u32) ~ 0); |
| 1313 | *b = vlib_get_buffer (vm, bi); |
| 1314 | data = tcp_init_buffer (vm, *b); |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1315 | n_bytes = stream_session_peek_bytes (&tc->connection, data, offset, |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1316 | bytes_per_buffer - MAX_HDRS_LEN); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1317 | b[0]->current_length = n_bytes; |
| 1318 | b[0]->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; |
| 1319 | b[0]->total_length_not_including_first_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1320 | max_deq_bytes -= n_bytes; |
| 1321 | |
| 1322 | chain_b = *b; |
| 1323 | for (i = 1; i < n_bufs_per_seg; i++) |
| 1324 | { |
| 1325 | prev_b = chain_b; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1326 | len_to_deq = clib_min (max_deq_bytes, bytes_per_buffer); |
| 1327 | tcp_get_free_buffer_index (wrk, &chain_bi); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1328 | ASSERT (chain_bi != (u32) ~ 0); |
| 1329 | chain_b = vlib_get_buffer (vm, chain_bi); |
| 1330 | chain_b->current_data = 0; |
Florin Coras | e87216f | 2017-08-17 16:59:22 -0700 | [diff] [blame] | 1331 | data = vlib_buffer_get_current (chain_b); |
| 1332 | n_peeked = stream_session_peek_bytes (&tc->connection, data, |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1333 | offset + n_bytes, len_to_deq); |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1334 | ASSERT (n_peeked == len_to_deq); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1335 | n_bytes += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1336 | chain_b->current_length = n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1337 | chain_b->next_buffer = 0; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1338 | |
| 1339 | /* update previous buffer */ |
| 1340 | prev_b->next_buffer = chain_bi; |
| 1341 | prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; |
| 1342 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1343 | max_deq_bytes -= n_peeked; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1344 | b[0]->total_length_not_including_first_buffer += n_peeked; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1345 | } |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1346 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1347 | tcp_push_hdr_i (tc, *b, tc->state, /* compute opts */ 0, /* burst */ 0); |
Florin Coras | 208daa1 | 2018-07-02 01:30:51 -0700 | [diff] [blame] | 1348 | if (seq_gt (tc->snd_nxt, tc->snd_una_max)) |
| 1349 | tc->snd_una_max = tc->snd_nxt; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1350 | } |
| 1351 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1352 | ASSERT (n_bytes > 0); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1353 | ASSERT (((*b)->current_data + (*b)->current_length) <= bytes_per_buffer); |
Florin Coras | bb292f4 | 2017-05-19 09:49:19 -0700 | [diff] [blame] | 1354 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1355 | return n_bytes; |
| 1356 | } |
| 1357 | |
| 1358 | /** |
| 1359 | * Build a retransmit segment |
| 1360 | * |
| 1361 | * @return the number of bytes in the segment or 0 if there's nothing to |
| 1362 | * retransmit |
| 1363 | */ |
| 1364 | static u32 |
| 1365 | tcp_prepare_retransmit_segment (tcp_worker_ctx_t * wrk, |
| 1366 | tcp_connection_t * tc, u32 offset, |
| 1367 | u32 max_deq_bytes, vlib_buffer_t ** b) |
| 1368 | { |
| 1369 | u32 start, available_bytes; |
| 1370 | int n_bytes = 0; |
| 1371 | |
| 1372 | ASSERT (tc->state >= TCP_STATE_ESTABLISHED); |
| 1373 | ASSERT (max_deq_bytes != 0); |
| 1374 | |
| 1375 | /* |
| 1376 | * Make sure we can retransmit something |
| 1377 | */ |
| 1378 | available_bytes = session_tx_fifo_max_dequeue (&tc->connection); |
| 1379 | ASSERT (available_bytes >= offset); |
| 1380 | available_bytes -= offset; |
| 1381 | if (!available_bytes) |
| 1382 | return 0; |
| 1383 | |
| 1384 | max_deq_bytes = clib_min (tc->snd_mss, max_deq_bytes); |
| 1385 | max_deq_bytes = clib_min (available_bytes, max_deq_bytes); |
| 1386 | |
| 1387 | /* Start is beyond snd_congestion */ |
| 1388 | start = tc->snd_una + offset; |
| 1389 | if (seq_geq (start, tc->snd_congestion)) |
| 1390 | goto done; |
| 1391 | |
| 1392 | /* Don't overshoot snd_congestion */ |
| 1393 | if (seq_gt (start + max_deq_bytes, tc->snd_congestion)) |
| 1394 | { |
| 1395 | max_deq_bytes = tc->snd_congestion - start; |
| 1396 | if (max_deq_bytes == 0) |
| 1397 | goto done; |
| 1398 | } |
| 1399 | |
| 1400 | n_bytes = tcp_prepare_segment (wrk, tc, offset, max_deq_bytes, b); |
| 1401 | if (!n_bytes) |
| 1402 | return 0; |
| 1403 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1404 | if (tcp_in_fastrecovery (tc)) |
| 1405 | tc->snd_rxt_bytes += n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1406 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1407 | done: |
| 1408 | TCP_EVT_DBG (TCP_EVT_CC_RTX, tc, offset, n_bytes); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1409 | return n_bytes; |
| 1410 | } |
| 1411 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1412 | /** |
| 1413 | * Reset congestion control, switch cwnd to loss window and try again. |
| 1414 | */ |
| 1415 | static void |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1416 | tcp_rxt_timeout_cc (tcp_connection_t * tc) |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1417 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1418 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 6); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1419 | tc->prev_ssthresh = tc->ssthresh; |
| 1420 | tc->prev_cwnd = tc->cwnd; |
| 1421 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1422 | /* Cleanly recover cc (also clears up fast retransmit) */ |
| 1423 | if (tcp_in_fastrecovery (tc)) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1424 | { |
| 1425 | /* TODO be less aggressive about this */ |
| 1426 | scoreboard_clear (&tc->sack_sb); |
| 1427 | tcp_cc_fastrecovery_exit (tc); |
| 1428 | } |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1429 | |
| 1430 | /* Start again from the beginning */ |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1431 | tc->cc_algo->congestion (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1432 | tc->cwnd = tcp_loss_wnd (tc); |
| 1433 | tc->snd_congestion = tc->snd_una_max; |
Florin Coras | f1762d6 | 2017-09-24 19:43:08 -0400 | [diff] [blame] | 1434 | tc->rtt_ts = 0; |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1435 | tc->cwnd_acc_bytes = 0; |
Florin Coras | c44a558 | 2018-11-01 16:30:54 -0700 | [diff] [blame] | 1436 | tcp_connection_tx_pacer_reset (tc, tc->cwnd, 2 * tc->snd_mss); |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1437 | tcp_recovery_on (tc); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1438 | } |
| 1439 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1440 | static inline void |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1441 | tcp_timer_retransmit_handler_i (u32 index, u8 is_syn) |
| 1442 | { |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 1443 | u32 thread_index = vlib_get_thread_index (); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1444 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| 1445 | vlib_main_t *vm = wrk->vm; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1446 | tcp_connection_t *tc; |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1447 | vlib_buffer_t *b = 0; |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1448 | u32 bi, n_bytes; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1449 | |
| 1450 | if (is_syn) |
| 1451 | { |
| 1452 | tc = tcp_half_open_connection_get (index); |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1453 | /* Note: the connection may have transitioned to ESTABLISHED... */ |
| 1454 | if (PREDICT_FALSE (tc == 0)) |
| 1455 | return; |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1456 | tc->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1457 | } |
| 1458 | else |
| 1459 | { |
| 1460 | tc = tcp_connection_get (index, thread_index); |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1461 | /* Note: the connection may have been closed and pool_put */ |
| 1462 | if (PREDICT_FALSE (tc == 0)) |
| 1463 | return; |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1464 | tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1465 | } |
| 1466 | |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1467 | if (tc->state >= TCP_STATE_ESTABLISHED) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1468 | { |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1469 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); |
| 1470 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1471 | /* Lost FIN, retransmit and return */ |
Florin Coras | 93e6580 | 2017-11-29 00:07:11 -0500 | [diff] [blame] | 1472 | if (tcp_is_lost_fin (tc)) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1473 | { |
| 1474 | tcp_send_fin (tc); |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1475 | tc->rto_boff += 1; |
| 1476 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1477 | return; |
| 1478 | } |
| 1479 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1480 | /* Shouldn't be here. This condition is tricky because it has to take |
| 1481 | * into account boff > 0 due to persist timeout. */ |
Florin Coras | 887b7ba | 2018-06-09 06:49:59 -0700 | [diff] [blame] | 1482 | if ((tc->rto_boff == 0 && tc->snd_una == tc->snd_una_max) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1483 | || (tc->rto_boff > 0 && seq_geq (tc->snd_una, tc->snd_congestion) |
| 1484 | && !tcp_flight_size (tc))) |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1485 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1486 | ASSERT (!tcp_in_recovery (tc)); |
| 1487 | tc->rto_boff = 0; |
Florin Coras | a096f2d | 2017-09-28 23:49:42 -0400 | [diff] [blame] | 1488 | return; |
| 1489 | } |
| 1490 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1491 | /* We're not in recovery so make sure rto_boff is 0. Can be non 0 due |
| 1492 | * to persist timer timeout */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1493 | if (!tcp_in_recovery (tc) && tc->rto_boff > 0) |
| 1494 | { |
| 1495 | tc->rto_boff = 0; |
| 1496 | tcp_update_rto (tc); |
| 1497 | } |
| 1498 | |
| 1499 | /* Increment RTO backoff (also equal to number of retries) and go back |
| 1500 | * to first un-acked byte */ |
| 1501 | tc->rto_boff += 1; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1502 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1503 | /* First retransmit timeout */ |
| 1504 | if (tc->rto_boff == 1) |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1505 | tcp_rxt_timeout_cc (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1506 | else |
| 1507 | scoreboard_clear (&tc->sack_sb); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1508 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1509 | /* If we've sent beyond snd_congestion, update it */ |
| 1510 | if (seq_gt (tc->snd_una_max, tc->snd_congestion)) |
| 1511 | tc->snd_congestion = tc->snd_una_max; |
| 1512 | |
Florin Coras | d2aab83 | 2018-05-22 11:39:59 -0700 | [diff] [blame] | 1513 | tc->snd_una_max = tc->snd_nxt = tc->snd_una; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1514 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1515 | |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1516 | /* Send one segment. Note that n_bytes may be zero due to buffer |
| 1517 | * shortfall */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1518 | n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b); |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1519 | |
Florin Coras | 3af90fc | 2017-05-03 21:09:42 -0700 | [diff] [blame] | 1520 | if (n_bytes == 0) |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1521 | { |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1522 | tcp_retransmit_timer_force_update (tc); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1523 | return; |
| 1524 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1525 | |
Dave Barach | b7f1faa | 2017-08-29 11:43:37 -0400 | [diff] [blame] | 1526 | bi = vlib_get_buffer_index (vm, b); |
| 1527 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1528 | /* For first retransmit, record timestamp (Eifel detection RFC3522) */ |
| 1529 | if (tc->rto_boff == 1) |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1530 | tc->snd_rxt_ts = tcp_time_now_w_thread (tc->c_thread_index); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1531 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1532 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1533 | tcp_retransmit_timer_force_update (tc); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1534 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1535 | /* Retransmit for SYN */ |
| 1536 | else if (tc->state == TCP_STATE_SYN_SENT) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1537 | { |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1538 | /* Half-open connection actually moved to established but we were |
| 1539 | * waiting for syn retransmit to pop to call cleanup from the right |
| 1540 | * thread. */ |
| 1541 | if (tc->flags & TCP_CONN_HALF_OPEN_DONE) |
| 1542 | { |
Florin Coras | 6881062 | 2017-07-24 17:40:28 -0700 | [diff] [blame] | 1543 | if (tcp_half_open_connection_cleanup (tc)) |
| 1544 | { |
| 1545 | clib_warning ("could not remove half-open connection"); |
| 1546 | ASSERT (0); |
| 1547 | } |
| 1548 | return; |
| 1549 | } |
| 1550 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1551 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); |
| 1552 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1553 | /* Try without increasing RTO a number of times. If this fails, |
| 1554 | * start growing RTO exponentially */ |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1555 | tc->rto_boff += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1556 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1557 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1558 | |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1559 | tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN, |
| 1560 | tc->rto * TCP_TO_TIMER_TICK); |
| 1561 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1562 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1563 | return; |
| 1564 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1565 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1566 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1567 | tcp_make_syn (tc, b); |
Florin Coras | e04c299 | 2017-03-01 08:17:34 -0800 | [diff] [blame] | 1568 | |
Dave Barach | 2c25a62 | 2017-06-26 11:35:07 -0400 | [diff] [blame] | 1569 | tc->rtt_ts = 0; |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1570 | TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 0); |
| 1571 | |
| 1572 | /* This goes straight to ipx_lookup. Retransmit timer set already */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1573 | tcp_push_ip_hdr (wrk, tc, b); |
| 1574 | tcp_enqueue_to_ip_lookup (wrk, b, bi, tc->c_is_ip4, tc->c_fib_index); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1575 | } |
| 1576 | /* Retransmit SYN-ACK */ |
| 1577 | else if (tc->state == TCP_STATE_SYN_RCVD) |
| 1578 | { |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1579 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 2); |
| 1580 | |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1581 | tc->rto_boff += 1; |
Florin Coras | 9d06304 | 2017-09-14 03:08:00 -0400 | [diff] [blame] | 1582 | if (tc->rto_boff > TCP_RTO_SYN_RETRIES) |
| 1583 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1584 | tc->rtt_ts = 0; |
| 1585 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1586 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 1587 | { |
| 1588 | tcp_retransmit_timer_force_update (tc); |
| 1589 | return; |
| 1590 | } |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1591 | |
| 1592 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1593 | tcp_init_buffer (vm, b); |
Florin Coras | 4eeeaaf | 2017-09-05 14:03:37 -0400 | [diff] [blame] | 1594 | tcp_make_synack (tc, b); |
| 1595 | TCP_EVT_DBG (TCP_EVT_SYN_RXT, tc, 1); |
| 1596 | |
| 1597 | /* Retransmit timer already updated, just enqueue to output */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1598 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1599 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1600 | else |
| 1601 | { |
| 1602 | ASSERT (tc->state == TCP_STATE_CLOSED); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1603 | return; |
| 1604 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1605 | } |
| 1606 | |
| 1607 | void |
| 1608 | tcp_timer_retransmit_handler (u32 index) |
| 1609 | { |
| 1610 | tcp_timer_retransmit_handler_i (index, 0); |
| 1611 | } |
| 1612 | |
| 1613 | void |
| 1614 | tcp_timer_retransmit_syn_handler (u32 index) |
| 1615 | { |
| 1616 | tcp_timer_retransmit_handler_i (index, 1); |
| 1617 | } |
| 1618 | |
| 1619 | /** |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1620 | * Got 0 snd_wnd from peer, try to do something about it. |
| 1621 | * |
| 1622 | */ |
| 1623 | void |
| 1624 | tcp_timer_persist_handler (u32 index) |
| 1625 | { |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 1626 | u32 thread_index = vlib_get_thread_index (); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1627 | tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); |
| 1628 | u32 bi, max_snd_bytes, available_bytes, offset; |
| 1629 | tcp_main_t *tm = vnet_get_tcp_main (); |
| 1630 | vlib_main_t *vm = wrk->vm; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1631 | tcp_connection_t *tc; |
| 1632 | vlib_buffer_t *b; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1633 | int n_bytes = 0; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1634 | u8 *data; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1635 | |
Florin Coras | db84e57 | 2017-05-09 18:54:52 -0700 | [diff] [blame] | 1636 | tc = tcp_connection_get_if_valid (index, thread_index); |
| 1637 | |
| 1638 | if (!tc) |
| 1639 | return; |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1640 | |
| 1641 | /* Make sure timer handle is set to invalid */ |
| 1642 | tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID; |
| 1643 | |
| 1644 | /* Problem already solved or worse */ |
Florin Coras | f03a59a | 2017-06-09 21:07:32 -0700 | [diff] [blame] | 1645 | if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1646 | || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc)) |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1647 | return; |
| 1648 | |
Florin Coras | 25579b4 | 2018-06-06 17:55:02 -0700 | [diff] [blame] | 1649 | available_bytes = session_tx_fifo_max_dequeue (&tc->connection); |
Florin Coras | 5095895 | 2017-08-29 14:50:13 -0700 | [diff] [blame] | 1650 | offset = tc->snd_una_max - tc->snd_una; |
| 1651 | |
| 1652 | /* Reprogram persist if no new bytes available to send. We may have data |
| 1653 | * next time */ |
| 1654 | if (!available_bytes) |
| 1655 | { |
| 1656 | tcp_persist_timer_set (tc); |
| 1657 | return; |
| 1658 | } |
| 1659 | |
| 1660 | if (available_bytes <= offset) |
| 1661 | { |
| 1662 | ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT)); |
| 1663 | return; |
| 1664 | } |
| 1665 | |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1666 | /* Increment RTO backoff */ |
| 1667 | tc->rto_boff += 1; |
| 1668 | tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX); |
| 1669 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1670 | /* |
| 1671 | * Try to force the first unsent segment (or buffer) |
| 1672 | */ |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1673 | if (PREDICT_FALSE (tcp_get_free_buffer_index (wrk, &bi))) |
Florin Coras | 3ec66b0 | 2018-08-23 16:27:05 -0700 | [diff] [blame] | 1674 | { |
| 1675 | tcp_persist_timer_set (tc); |
| 1676 | return; |
| 1677 | } |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1678 | b = vlib_get_buffer (vm, bi); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1679 | data = tcp_init_buffer (vm, b); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1680 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1681 | tcp_validate_txf_size (tc, offset); |
Florin Coras | c834341 | 2017-05-04 14:25:50 -0700 | [diff] [blame] | 1682 | tc->snd_opts_len = tcp_make_options (tc, &tc->snd_opts, tc->state); |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1683 | max_snd_bytes = clib_min (tc->snd_mss, tm->bytes_per_buffer - MAX_HDRS_LEN); |
| 1684 | n_bytes = stream_session_peek_bytes (&tc->connection, data, offset, |
| 1685 | max_snd_bytes); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1686 | b->current_length = n_bytes; |
Florin Coras | 84275e9 | 2017-09-26 12:30:40 -0400 | [diff] [blame] | 1687 | ASSERT (n_bytes != 0 && (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT) |
| 1688 | || tc->snd_nxt == tc->snd_una_max |
| 1689 | || tc->rto_boff > 1)); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1690 | |
Florin Coras | b26743d | 2018-06-26 09:31:04 -0700 | [diff] [blame] | 1691 | tcp_push_hdr_i (tc, b, tc->state, /* compute opts */ 0, /* burst */ 0); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 1692 | tc->snd_una_max = tc->snd_nxt; |
| 1693 | tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1694 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1695 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1696 | /* Just sent new data, enable retransmit */ |
| 1697 | tcp_retransmit_timer_update (tc); |
Florin Coras | 3e350af | 2017-03-30 02:54:28 -0700 | [diff] [blame] | 1698 | } |
| 1699 | |
| 1700 | /** |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1701 | * Retransmit first unacked segment |
| 1702 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1703 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1704 | 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] | 1705 | { |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1706 | u32 bi, old_snd_nxt, n_bytes; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1707 | vlib_main_t *vm = wrk->vm; |
| 1708 | vlib_buffer_t *b; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1709 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1710 | old_snd_nxt = tc->snd_nxt; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1711 | tc->snd_nxt = tc->snd_una; |
| 1712 | |
Florin Coras | e55a6d7 | 2018-10-31 23:09:22 -0700 | [diff] [blame] | 1713 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 1); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1714 | |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1715 | 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] | 1716 | if (!n_bytes) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1717 | return -1; |
| 1718 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1719 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1720 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1721 | tc->snd_nxt = old_snd_nxt; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1722 | |
| 1723 | return 0; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1724 | } |
| 1725 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1726 | static int |
| 1727 | tcp_fast_retransmit_unsent (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1728 | u32 burst_size) |
| 1729 | { |
| 1730 | u32 offset, n_segs = 0, n_written, bi; |
| 1731 | vlib_main_t *vm = wrk->vm; |
| 1732 | vlib_buffer_t *b = 0; |
| 1733 | |
| 1734 | tc->snd_nxt = tc->snd_una_max; |
| 1735 | offset = tc->snd_una_max - tc->snd_una; |
| 1736 | while (n_segs < burst_size) |
| 1737 | { |
| 1738 | n_written = tcp_prepare_segment (wrk, tc, offset, tc->snd_mss, &b); |
| 1739 | if (!n_written) |
| 1740 | goto done; |
| 1741 | |
| 1742 | bi = vlib_get_buffer_index (vm, b); |
| 1743 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
| 1744 | offset += n_written; |
| 1745 | n_segs += 1; |
| 1746 | } |
| 1747 | |
| 1748 | done: |
| 1749 | return n_segs; |
| 1750 | } |
| 1751 | |
| 1752 | #define scoreboard_rescue_rxt_valid(_sb, _tc) \ |
| 1753 | (seq_geq (_sb->rescue_rxt, _tc->snd_una) \ |
| 1754 | && seq_leq (_sb->rescue_rxt, _tc->snd_congestion)) |
| 1755 | |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1756 | /** |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1757 | * Do fast retransmit with SACKs |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1758 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1759 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1760 | tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1761 | u32 burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1762 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1763 | u32 n_written = 0, offset, max_bytes, n_segs = 0, n_segs_now; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1764 | sack_scoreboard_hole_t *hole; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1765 | vlib_main_t *vm = wrk->vm; |
| 1766 | vlib_buffer_t *b = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1767 | sack_scoreboard_t *sb; |
| 1768 | u32 bi, old_snd_nxt; |
| 1769 | int snd_space; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1770 | u32 max_deq; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1771 | u8 snd_limited = 0, can_rescue = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1772 | |
| 1773 | ASSERT (tcp_in_fastrecovery (tc)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1774 | |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1775 | snd_space = tcp_available_cc_snd_space (tc); |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1776 | if (snd_space < tc->snd_mss) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1777 | { |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1778 | tcp_program_fastretransmit (wrk, tc); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1779 | return 0; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1780 | } |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1781 | |
| 1782 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1783 | old_snd_nxt = tc->snd_nxt; |
| 1784 | sb = &tc->sack_sb; |
| 1785 | hole = scoreboard_get_hole (sb, sb->cur_rxt_hole); |
| 1786 | |
| 1787 | max_deq = session_tx_fifo_max_dequeue (&tc->connection); |
| 1788 | max_deq -= tc->snd_una_max - tc->snd_una; |
| 1789 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1790 | while (snd_space > 0 && n_segs < burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1791 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1792 | hole = scoreboard_next_rxt_hole (sb, hole, max_deq, &can_rescue, |
| 1793 | &snd_limited); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1794 | if (!hole) |
| 1795 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1796 | if (max_deq) |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1797 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1798 | snd_space = clib_min (max_deq, snd_space); |
| 1799 | burst_size = clib_min (burst_size - n_segs, |
| 1800 | snd_space / tc->snd_mss); |
| 1801 | n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size); |
| 1802 | if (max_deq > n_segs_now * tc->snd_mss) |
| 1803 | tcp_program_fastretransmit (wrk, tc); |
| 1804 | n_segs += n_segs_now; |
| 1805 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1806 | } |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1807 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1808 | if (!can_rescue || scoreboard_rescue_rxt_valid (sb, tc)) |
| 1809 | break; |
| 1810 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1811 | /* If rescue rxt undefined or less than snd_una then one segment of |
| 1812 | * up to SMSS octets that MUST include the highest outstanding |
| 1813 | * unSACKed sequence number SHOULD be returned, and RescueRxt set to |
| 1814 | * RecoveryPoint. HighRxt MUST NOT be updated. |
| 1815 | */ |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1816 | max_bytes = clib_min (tc->snd_mss, |
| 1817 | tc->snd_congestion - tc->snd_una); |
| 1818 | max_bytes = clib_min (max_bytes, snd_space); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1819 | offset = tc->snd_congestion - tc->snd_una - max_bytes; |
| 1820 | sb->rescue_rxt = tc->snd_congestion; |
| 1821 | tc->snd_nxt = tc->snd_una + offset; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1822 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, |
| 1823 | max_bytes, &b); |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1824 | if (!n_written) |
| 1825 | goto done; |
| 1826 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1827 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1828 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1829 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1830 | break; |
| 1831 | } |
| 1832 | |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1833 | max_bytes = clib_min (hole->end - sb->high_rxt, snd_space); |
| 1834 | max_bytes = snd_limited ? clib_min (max_bytes, tc->snd_mss) : max_bytes; |
| 1835 | if (max_bytes == 0) |
| 1836 | break; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1837 | |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1838 | offset = sb->high_rxt - tc->snd_una; |
Florin Coras | 1f152cd | 2017-08-18 19:28:03 -0700 | [diff] [blame] | 1839 | tc->snd_nxt = sb->high_rxt; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1840 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, max_bytes, |
| 1841 | &b); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1842 | ASSERT (n_written <= snd_space); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1843 | |
| 1844 | /* Nothing left to retransmit */ |
| 1845 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1846 | break; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1847 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1848 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1849 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1850 | |
| 1851 | sb->high_rxt += n_written; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1852 | snd_space -= n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1853 | n_segs += 1; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1854 | } |
| 1855 | |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1856 | if (hole) |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1857 | tcp_program_fastretransmit (wrk, tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1858 | |
Florin Coras | 24793e3 | 2018-05-09 11:34:25 -0700 | [diff] [blame] | 1859 | done: |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1860 | /* If window allows, send 1 SMSS of new data */ |
| 1861 | tc->snd_nxt = old_snd_nxt; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1862 | return n_segs; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1863 | } |
| 1864 | |
| 1865 | /** |
| 1866 | * Fast retransmit without SACK info |
| 1867 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1868 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1869 | tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1870 | u32 burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1871 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1872 | u32 n_written = 0, offset = 0, bi, old_snd_nxt, max_deq, n_segs_now; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1873 | vlib_main_t *vm = wrk->vm; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1874 | int snd_space, n_segs = 0; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1875 | vlib_buffer_t *b; |
| 1876 | |
| 1877 | ASSERT (tcp_in_fastrecovery (tc)); |
| 1878 | TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 0); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1879 | old_snd_nxt = tc->snd_nxt; |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1880 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1881 | if (!tcp_fastrecovery_first (tc)) |
| 1882 | goto send_unsent; |
| 1883 | |
| 1884 | /* RFC 6582: [If a partial ack], retransmit the first unacknowledged |
| 1885 | * segment. */ |
| 1886 | snd_space = tc->sack_sb.last_bytes_delivered; |
| 1887 | tc->snd_nxt = tc->snd_una; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1888 | while (snd_space > 0 && n_segs < burst_size) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1889 | { |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1890 | n_written = tcp_prepare_retransmit_segment (wrk, tc, offset, |
| 1891 | tc->snd_mss, &b); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1892 | |
| 1893 | /* Nothing left to retransmit */ |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1894 | if (n_written == 0) |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1895 | break; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1896 | |
Florin Coras | b2215d6 | 2017-08-01 16:56:58 -0700 | [diff] [blame] | 1897 | bi = vlib_get_buffer_index (vm, b); |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1898 | tcp_enqueue_to_output (wrk, b, bi, tc->c_is_ip4); |
Florin Coras | 6792ec0 | 2017-03-13 03:49:51 -0700 | [diff] [blame] | 1899 | snd_space -= n_written; |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1900 | offset += n_written; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1901 | n_segs += 1; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1902 | } |
| 1903 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1904 | if (n_segs == burst_size) |
| 1905 | goto done; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1906 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1907 | send_unsent: |
| 1908 | |
| 1909 | /* RFC 6582: Send a new segment if permitted by the new value of cwnd. */ |
| 1910 | snd_space = tcp_available_cc_snd_space (tc); |
Florin Coras | 9ece3c0 | 2018-11-05 11:06:53 -0800 | [diff] [blame^] | 1911 | if (snd_space < tc->snd_mss || tc->snd_mss == 0) |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1912 | goto done; |
| 1913 | |
| 1914 | max_deq = session_tx_fifo_max_dequeue (&tc->connection); |
| 1915 | max_deq -= tc->snd_una_max - tc->snd_una; |
| 1916 | if (max_deq) |
| 1917 | { |
| 1918 | snd_space = clib_min (max_deq, snd_space); |
| 1919 | burst_size = clib_min (burst_size - n_segs, snd_space / tc->snd_mss); |
| 1920 | n_segs_now = tcp_fast_retransmit_unsent (wrk, tc, burst_size); |
| 1921 | if (max_deq > n_segs_now * tc->snd_mss) |
| 1922 | tcp_program_fastretransmit (wrk, tc); |
| 1923 | n_segs += n_segs_now; |
| 1924 | } |
| 1925 | |
| 1926 | /* Restore snd_nxt */ |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1927 | tc->snd_nxt = old_snd_nxt; |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1928 | |
Florin Coras | 36ee9f1 | 2018-11-02 12:52:10 -0700 | [diff] [blame] | 1929 | done: |
| 1930 | tcp_fastrecovery_first_off (tc); |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1931 | return n_segs; |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1932 | } |
| 1933 | |
| 1934 | /** |
| 1935 | * Do fast retransmit |
| 1936 | */ |
Florin Coras | bf4d5ce | 2018-10-19 16:26:24 -0700 | [diff] [blame] | 1937 | int |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1938 | tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, |
| 1939 | u32 burst_size) |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1940 | { |
Florin Coras | ca1c8f3 | 2018-05-23 21:01:30 -0700 | [diff] [blame] | 1941 | if (tcp_opts_sack_permitted (&tc->rcv_opts)) |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1942 | return tcp_fast_retransmit_sack (wrk, tc, burst_size); |
Florin Coras | 93992a9 | 2017-05-24 18:03:56 -0700 | [diff] [blame] | 1943 | else |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 1944 | return tcp_fast_retransmit_no_sack (wrk, tc, burst_size); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1945 | } |
| 1946 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 1947 | static u32 |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1948 | tcp_session_has_ooo_data (tcp_connection_t * tc) |
| 1949 | { |
Florin Coras | cea194d | 2017-10-02 00:18:51 -0700 | [diff] [blame] | 1950 | stream_session_t *s = session_get (tc->c_s_index, tc->c_thread_index); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1951 | return svm_fifo_has_ooo_data (s->server_rx_fifo); |
| 1952 | } |
| 1953 | |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1954 | static void |
| 1955 | 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] | 1956 | u16 * next0, u32 * error0) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1957 | { |
| 1958 | ip_adjacency_t *adj; |
| 1959 | adj_index_t ai; |
| 1960 | |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 1961 | /* Not thread safe but as long as the connection exists the adj should |
| 1962 | * not be removed */ |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1963 | ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip, |
| 1964 | tc0->sw_if_index); |
| 1965 | if (ai == ADJ_INDEX_INVALID) |
| 1966 | { |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1967 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
| 1968 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 1969 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 1970 | return; |
| 1971 | } |
| 1972 | |
| 1973 | adj = adj_get (ai); |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 1974 | if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE)) |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1975 | *next0 = TCP_OUTPUT_NEXT_IP_REWRITE; |
| 1976 | else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP) |
| 1977 | *next0 = TCP_OUTPUT_NEXT_IP_ARP; |
Florin Coras | 1c8ff63 | 2018-05-17 13:28:34 -0700 | [diff] [blame] | 1978 | else |
| 1979 | { |
| 1980 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 1981 | *error0 = TCP_ERROR_LINK_LOCAL_RW; |
| 1982 | } |
| 1983 | vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai; |
Florin Coras | f9d0568 | 2018-04-26 08:26:52 -0700 | [diff] [blame] | 1984 | } |
| 1985 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 1986 | static void |
| 1987 | tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 1988 | u32 * to_next, u32 n_bufs) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1989 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 1990 | u32 n_trace = vlib_get_trace_count (vm, node); |
| 1991 | tcp_connection_t *tc; |
| 1992 | tcp_tx_trace_t *t; |
| 1993 | vlib_buffer_t *b; |
| 1994 | tcp_header_t *th; |
| 1995 | int i; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1996 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 1997 | for (i = 0; i < clib_min (n_trace, n_bufs); i++) |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 1998 | { |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 1999 | b = vlib_get_buffer (vm, to_next[i]); |
| 2000 | th = vlib_buffer_get_current (b); |
| 2001 | tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index, |
| 2002 | vm->thread_index); |
| 2003 | t = vlib_add_trace (vm, node, b, sizeof (*t)); |
| 2004 | clib_memcpy (&t->tcp_header, th, sizeof (t->tcp_header)); |
| 2005 | clib_memcpy (&t->tcp_connection, tc, sizeof (t->tcp_connection)); |
| 2006 | } |
| 2007 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2008 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2009 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2010 | tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0, |
| 2011 | tcp_connection_t * tc0, u8 is_ip4) |
| 2012 | { |
| 2013 | tcp_header_t *th0 = 0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2014 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2015 | th0 = vlib_buffer_get_current (b0); |
| 2016 | TCP_EVT_DBG (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length); |
| 2017 | if (is_ip4) |
| 2018 | { |
| 2019 | vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4, |
| 2020 | IP_PROTOCOL_TCP, 1); |
| 2021 | b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; |
| 2022 | vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data; |
| 2023 | th0->checksum = 0; |
| 2024 | } |
| 2025 | else |
| 2026 | { |
| 2027 | ip6_header_t *ih0; |
| 2028 | ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6, |
| 2029 | &tc0->c_rmt_ip6, IP_PROTOCOL_TCP); |
| 2030 | b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; |
| 2031 | vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data; |
| 2032 | vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data; |
| 2033 | th0->checksum = 0; |
| 2034 | } |
| 2035 | } |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2036 | |
Florin Coras | 0dbd517 | 2018-06-25 16:19:34 -0700 | [diff] [blame] | 2037 | always_inline void |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2038 | tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0, |
| 2039 | u32 * error0, u16 * next0, u8 is_ip4) |
| 2040 | { |
Florin Coras | 81a13db | 2018-03-16 08:48:31 -0700 | [diff] [blame] | 2041 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2042 | if (PREDICT_FALSE (tc0->state == TCP_STATE_CLOSED)) |
| 2043 | { |
| 2044 | *error0 = TCP_ERROR_INVALID_CONNECTION; |
| 2045 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2046 | return; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2047 | } |
| 2048 | |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2049 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index; |
| 2050 | vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0; |
| 2051 | |
| 2052 | if (!is_ip4) |
| 2053 | { |
| 2054 | if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6))) |
| 2055 | tcp_output_handle_link_local (tc0, b0, next0, error0); |
| 2056 | } |
| 2057 | |
| 2058 | /* Filter out DUPACKs if there are no OOO segments left */ |
| 2059 | if (PREDICT_FALSE (vnet_buffer (b0)->tcp.flags & TCP_BUF_FLAG_DUPACK)) |
| 2060 | { |
| 2061 | /* N.B. Should not filter burst of dupacks. Two issues: |
| 2062 | * 1) dupacks open cwnd on remote peer when congested |
| 2063 | * 2) acks leaving should have the latest rcv_wnd since the |
| 2064 | * burst may have eaten up all of it, so only the old ones |
| 2065 | * could be filtered. |
| 2066 | */ |
| 2067 | if (!tcp_session_has_ooo_data (tc0)) |
| 2068 | { |
| 2069 | *error0 = TCP_ERROR_FILTERED_DUPACKS; |
| 2070 | *next0 = TCP_OUTPUT_NEXT_DROP; |
| 2071 | return; |
| 2072 | } |
| 2073 | } |
| 2074 | |
| 2075 | /* Stop DELACK timer and fix flags */ |
| 2076 | tc0->flags &= ~(TCP_CONN_SNDACK); |
| 2077 | if (!TCP_ALWAYS_ACK) |
| 2078 | tcp_timer_reset (tc0, TCP_TIMER_DELACK); |
| 2079 | } |
| 2080 | |
| 2081 | always_inline uword |
| 2082 | tcp46_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2083 | vlib_frame_t * frame, int is_ip4) |
| 2084 | { |
| 2085 | u32 n_left_from, *from, thread_index = vm->thread_index; |
| 2086 | vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| 2087 | u16 nexts[VLIB_FRAME_SIZE], *next; |
| 2088 | |
| 2089 | from = vlib_frame_vector_args (frame); |
| 2090 | n_left_from = frame->n_vectors; |
Florin Coras | be72ae6 | 2018-11-01 11:23:03 -0700 | [diff] [blame] | 2091 | tcp_set_time_now (tcp_get_worker (thread_index)); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2092 | |
| 2093 | if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) |
| 2094 | tcp46_output_trace_frame (vm, node, from, n_left_from); |
| 2095 | |
| 2096 | vlib_get_buffers (vm, from, bufs, n_left_from); |
| 2097 | b = bufs; |
| 2098 | next = nexts; |
| 2099 | |
| 2100 | while (n_left_from >= 4) |
| 2101 | { |
| 2102 | u32 error0 = TCP_ERROR_PKTS_SENT, error1 = TCP_ERROR_PKTS_SENT; |
| 2103 | tcp_connection_t *tc0, *tc1; |
| 2104 | |
| 2105 | { |
| 2106 | vlib_prefetch_buffer_header (b[2], STORE); |
| 2107 | CLIB_PREFETCH (b[2]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2108 | |
| 2109 | vlib_prefetch_buffer_header (b[3], STORE); |
| 2110 | CLIB_PREFETCH (b[3]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
| 2111 | } |
| 2112 | |
| 2113 | next[0] = next[1] = TCP_OUTPUT_NEXT_IP_LOOKUP; |
| 2114 | |
| 2115 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2116 | thread_index); |
| 2117 | tc1 = tcp_connection_get (vnet_buffer (b[1])->tcp.connection_index, |
| 2118 | thread_index); |
| 2119 | |
| 2120 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
| 2121 | tcp_output_push_ip (vm, b[1], tc1, is_ip4); |
| 2122 | |
| 2123 | tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4); |
| 2124 | tcp_output_handle_packet (tc1, b[1], &error1, &next[1], is_ip4); |
| 2125 | |
| 2126 | b += 2; |
| 2127 | next += 2; |
| 2128 | n_left_from -= 2; |
| 2129 | } |
| 2130 | while (n_left_from > 0) |
| 2131 | { |
| 2132 | u32 error0 = TCP_ERROR_PKTS_SENT; |
| 2133 | tcp_connection_t *tc0; |
| 2134 | |
| 2135 | if (n_left_from > 1) |
| 2136 | { |
Florin Coras | 91ca462 | 2018-06-30 11:27:59 -0700 | [diff] [blame] | 2137 | vlib_prefetch_buffer_header (b[1], STORE); |
| 2138 | CLIB_PREFETCH (b[1]->data, 2 * CLIB_CACHE_LINE_BYTES, STORE); |
Florin Coras | 8b20bf5 | 2018-06-14 14:55:50 -0700 | [diff] [blame] | 2139 | } |
| 2140 | |
| 2141 | next[0] = TCP_OUTPUT_NEXT_IP_LOOKUP; |
| 2142 | tc0 = tcp_connection_get (vnet_buffer (b[0])->tcp.connection_index, |
| 2143 | thread_index); |
| 2144 | |
| 2145 | tcp_output_push_ip (vm, b[0], tc0, is_ip4); |
| 2146 | tcp_output_handle_packet (tc0, b[0], &error0, &next[0], is_ip4); |
| 2147 | |
| 2148 | b += 1; |
| 2149 | next += 1; |
| 2150 | n_left_from -= 1; |
| 2151 | } |
| 2152 | |
| 2153 | vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| 2154 | return frame->n_vectors; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2155 | } |
| 2156 | |
| 2157 | static uword |
| 2158 | tcp4_output (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2159 | vlib_frame_t * from_frame) |
| 2160 | { |
| 2161 | return tcp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ ); |
| 2162 | } |
| 2163 | |
| 2164 | static uword |
| 2165 | tcp6_output (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2166 | vlib_frame_t * from_frame) |
| 2167 | { |
| 2168 | return tcp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ ); |
| 2169 | } |
| 2170 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2171 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2172 | VLIB_REGISTER_NODE (tcp4_output_node) = |
| 2173 | { |
| 2174 | .function = tcp4_output,.name = "tcp4-output", |
| 2175 | /* Takes a vector of packets. */ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2176 | .vector_size = sizeof (u32), |
| 2177 | .n_errors = TCP_N_ERROR, |
| 2178 | .error_strings = tcp_error_strings, |
| 2179 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2180 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2181 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2182 | foreach_tcp4_output_next |
| 2183 | #undef _ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2184 | }, |
| 2185 | .format_buffer = format_tcp_header, |
| 2186 | .format_trace = format_tcp_tx_trace, |
| 2187 | }; |
| 2188 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2189 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2190 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_output_node, tcp4_output); |
| 2191 | |
| 2192 | /* *INDENT-OFF* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2193 | VLIB_REGISTER_NODE (tcp6_output_node) = |
| 2194 | { |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2195 | .function = tcp6_output, |
| 2196 | .name = "tcp6-output", |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2197 | /* Takes a vector of packets. */ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2198 | .vector_size = sizeof (u32), |
| 2199 | .n_errors = TCP_N_ERROR, |
| 2200 | .error_strings = tcp_error_strings, |
| 2201 | .n_next_nodes = TCP_OUTPUT_N_NEXT, |
| 2202 | .next_nodes = { |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2203 | #define _(s,n) [TCP_OUTPUT_NEXT_##s] = n, |
| 2204 | foreach_tcp6_output_next |
| 2205 | #undef _ |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2206 | }, |
| 2207 | .format_buffer = format_tcp_header, |
| 2208 | .format_trace = format_tcp_tx_trace, |
| 2209 | }; |
| 2210 | /* *INDENT-ON* */ |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2211 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2212 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_output_node, tcp6_output); |
| 2213 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2214 | typedef enum _tcp_reset_next |
| 2215 | { |
| 2216 | TCP_RESET_NEXT_DROP, |
| 2217 | TCP_RESET_NEXT_IP_LOOKUP, |
| 2218 | TCP_RESET_N_NEXT |
| 2219 | } tcp_reset_next_t; |
| 2220 | |
| 2221 | #define foreach_tcp4_reset_next \ |
| 2222 | _(DROP, "error-drop") \ |
| 2223 | _(IP_LOOKUP, "ip4-lookup") |
| 2224 | |
| 2225 | #define foreach_tcp6_reset_next \ |
| 2226 | _(DROP, "error-drop") \ |
| 2227 | _(IP_LOOKUP, "ip6-lookup") |
| 2228 | |
| 2229 | static uword |
| 2230 | tcp46_send_reset_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2231 | vlib_frame_t * from_frame, u8 is_ip4) |
| 2232 | { |
| 2233 | u32 n_left_from, next_index, *from, *to_next; |
Damjan Marion | 586afd7 | 2017-04-05 19:18:20 +0200 | [diff] [blame] | 2234 | u32 my_thread_index = vm->thread_index; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2235 | |
| 2236 | from = vlib_frame_vector_args (from_frame); |
| 2237 | n_left_from = from_frame->n_vectors; |
| 2238 | |
| 2239 | next_index = node->cached_next_index; |
| 2240 | |
| 2241 | while (n_left_from > 0) |
| 2242 | { |
| 2243 | u32 n_left_to_next; |
| 2244 | |
| 2245 | vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| 2246 | |
| 2247 | while (n_left_from > 0 && n_left_to_next > 0) |
| 2248 | { |
| 2249 | u32 bi0; |
| 2250 | vlib_buffer_t *b0; |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2251 | tcp_tx_trace_t *t0; |
| 2252 | tcp_header_t *th0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2253 | u32 error0 = TCP_ERROR_RST_SENT, next0 = TCP_RESET_NEXT_IP_LOOKUP; |
| 2254 | |
| 2255 | bi0 = from[0]; |
| 2256 | to_next[0] = bi0; |
| 2257 | from += 1; |
| 2258 | to_next += 1; |
| 2259 | n_left_from -= 1; |
| 2260 | n_left_to_next -= 1; |
| 2261 | |
| 2262 | b0 = vlib_get_buffer (vm, bi0); |
| 2263 | |
| 2264 | if (tcp_make_reset_in_place (vm, b0, vnet_buffer (b0)->tcp.flags, |
| 2265 | my_thread_index, is_ip4)) |
| 2266 | { |
| 2267 | error0 = TCP_ERROR_LOOKUP_DROPS; |
| 2268 | next0 = TCP_RESET_NEXT_DROP; |
| 2269 | goto done; |
| 2270 | } |
| 2271 | |
| 2272 | /* Prepare to send to IP lookup */ |
Florin Coras | f988e69 | 2017-11-27 04:34:14 -0500 | [diff] [blame] | 2273 | vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2274 | next0 = TCP_RESET_NEXT_IP_LOOKUP; |
| 2275 | |
| 2276 | done: |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2277 | b0->error = node->errors[error0]; |
Damjan Marion | 213b5aa | 2017-07-13 21:19:27 +0200 | [diff] [blame] | 2278 | b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED; |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2279 | if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| 2280 | { |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2281 | th0 = vlib_buffer_get_current (b0); |
| 2282 | if (is_ip4) |
| 2283 | th0 = ip4_next_header ((ip4_header_t *) th0); |
| 2284 | else |
| 2285 | th0 = ip6_next_header ((ip6_header_t *) th0); |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2286 | t0 = vlib_add_trace (vm, node, b0, sizeof (*t0)); |
| 2287 | clib_memcpy (&t0->tcp_header, th0, sizeof (t0->tcp_header)); |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2288 | } |
| 2289 | |
| 2290 | vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| 2291 | n_left_to_next, bi0, next0); |
| 2292 | } |
| 2293 | vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| 2294 | } |
| 2295 | return from_frame->n_vectors; |
| 2296 | } |
| 2297 | |
| 2298 | static uword |
| 2299 | tcp4_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2300 | vlib_frame_t * from_frame) |
| 2301 | { |
| 2302 | return tcp46_send_reset_inline (vm, node, from_frame, 1); |
| 2303 | } |
| 2304 | |
| 2305 | static uword |
| 2306 | tcp6_send_reset (vlib_main_t * vm, vlib_node_runtime_t * node, |
| 2307 | vlib_frame_t * from_frame) |
| 2308 | { |
| 2309 | return tcp46_send_reset_inline (vm, node, from_frame, 0); |
| 2310 | } |
| 2311 | |
| 2312 | /* *INDENT-OFF* */ |
| 2313 | VLIB_REGISTER_NODE (tcp4_reset_node) = { |
| 2314 | .function = tcp4_send_reset, |
| 2315 | .name = "tcp4-reset", |
| 2316 | .vector_size = sizeof (u32), |
| 2317 | .n_errors = TCP_N_ERROR, |
| 2318 | .error_strings = tcp_error_strings, |
| 2319 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2320 | .next_nodes = { |
| 2321 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2322 | foreach_tcp4_reset_next |
| 2323 | #undef _ |
| 2324 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2325 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2326 | }; |
| 2327 | /* *INDENT-ON* */ |
| 2328 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2329 | VLIB_NODE_FUNCTION_MULTIARCH (tcp4_reset_node, tcp4_send_reset); |
| 2330 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2331 | /* *INDENT-OFF* */ |
| 2332 | VLIB_REGISTER_NODE (tcp6_reset_node) = { |
| 2333 | .function = tcp6_send_reset, |
| 2334 | .name = "tcp6-reset", |
| 2335 | .vector_size = sizeof (u32), |
| 2336 | .n_errors = TCP_N_ERROR, |
| 2337 | .error_strings = tcp_error_strings, |
| 2338 | .n_next_nodes = TCP_RESET_N_NEXT, |
| 2339 | .next_nodes = { |
| 2340 | #define _(s,n) [TCP_RESET_NEXT_##s] = n, |
| 2341 | foreach_tcp6_reset_next |
| 2342 | #undef _ |
| 2343 | }, |
Clement Durand | 6cf260c | 2017-04-13 13:27:04 +0200 | [diff] [blame] | 2344 | .format_trace = format_tcp_tx_trace, |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2345 | }; |
| 2346 | /* *INDENT-ON* */ |
| 2347 | |
Florin Coras | e69f495 | 2017-03-07 10:06:24 -0800 | [diff] [blame] | 2348 | VLIB_NODE_FUNCTION_MULTIARCH (tcp6_reset_node, tcp6_send_reset); |
| 2349 | |
Dave Barach | 68b0fb0 | 2017-02-28 15:15:56 -0500 | [diff] [blame] | 2350 | /* |
| 2351 | * fd.io coding-style-patch-verification: ON |
| 2352 | * |
| 2353 | * Local Variables: |
| 2354 | * eval: (c-set-style "gnu") |
| 2355 | * End: |
| 2356 | */ |