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authorFlorin Coras <fcoras@cisco.com>2018-12-12 19:25:43 -0800
committerDave Barach <openvpp@barachs.net>2018-12-13 13:41:01 +0000
commite80b59104f575ada05950e2cd010dc1680df3f73 (patch)
tree20f797f6cb8ae8849f7b213f902e644307588034 /src/vnet/tcp/tcp_input.c
parent05ecfcc08a2a38f23e74543f3062dec3388c83bc (diff)
tcp: fix handling of no wscale in syns
Change-Id: I7219a8d315b312812acafd9d2709fba8b4a2a679 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/tcp/tcp_input.c')
-rw-r--r--src/vnet/tcp/tcp_input.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 395943739e8..fc1aff40747 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -2480,6 +2480,8 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
if (tcp_opts_wscale (&new_tc0->rcv_opts))
new_tc0->snd_wscale = new_tc0->rcv_opts.wscale;
+ else
+ new_tc0->rcv_wscale = 0;
new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
<< new_tc0->snd_wscale;
f='#n183'>183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * flow_report.c
 */
#include <vnet/flow/flow_report.h>
#include <vnet/api_errno.h>

flow_report_main_t flow_report_main;

static_always_inline u8 stream_index_valid (u32 index)
{
  flow_report_main_t * frm = &flow_report_main;
  return index < vec_len(frm->streams) &&
         frm->streams[index].domain_id != ~0;
}

static_always_inline flow_report_stream_t * add_stream (void)
{
  flow_report_main_t * frm = &flow_report_main;
  u32 i;
  for (i = 0; i < vec_len(frm->streams); i++)
    if (!stream_index_valid(i))
      return &frm->streams[i];
  u32 index = vec_len(frm->streams);
  vec_validate(frm->streams, index);
  return &frm->streams[index];
}

static_always_inline void delete_stream (u32 index)
{
  flow_report_main_t * frm = &flow_report_main;
  ASSERT (index < vec_len(frm->streams));
  ASSERT (frm->streams[index].domain_id != ~0);
  frm->streams[index].domain_id = ~0;
}

static i32 find_stream (u32 domain_id, u16 src_port)
{
  flow_report_main_t * frm = &flow_report_main;
  flow_report_stream_t * stream;
  u32 i;
  for (i = 0; i < vec_len(frm->streams); i++)
    if (stream_index_valid(i)) {
      stream = &frm->streams[i];
      if (domain_id == stream->domain_id) {
        if (src_port != stream->src_port)
          return -2;
        return i;
      } else if (src_port == stream->src_port) {
        return -2;
      }
    }
  return -1;
}

int send_template_packet (flow_report_main_t *frm, 
                          flow_report_t *fr,
                          u32 * buffer_indexp)
{
  u32 bi0;
  vlib_buffer_t * b0;
  ip4_ipfix_template_packet_t * tp;
  ipfix_message_header_t * h;
  ip4_header_t * ip;
  udp_header_t * udp;
  vlib_main_t * vm = frm->vlib_main;
  flow_report_stream_t * stream;
  vlib_buffer_free_list_t *fl;

  ASSERT (buffer_indexp);

  if (fr->update_rewrite || fr->rewrite == 0)
    {
      if (frm->ipfix_collector.as_u32 == 0 
          || frm->src_address.as_u32 == 0)
        {
          vlib_node_set_state (frm->vlib_main, flow_report_process_node.index,
                               VLIB_NODE_STATE_DISABLED);
          return -1;
        }
      vec_free (fr->rewrite);
      fr->update_rewrite = 1;
    }

  if (fr->update_rewrite)
    {
      fr->rewrite = fr->rewrite_callback (frm, fr,
                                          &frm->ipfix_collector,
                                          &frm->src_address,
                                          frm->collector_port);
      fr->update_rewrite = 0;
    }

  if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
    return -1;
  
  b0 = vlib_get_buffer (vm, bi0);

  /* Initialize the buffer */
  fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
  vlib_buffer_init_for_free_list (b0, fl);
  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);

  ASSERT (vec_len (fr->rewrite) < VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES);
    
  clib_memcpy (b0->data, fr->rewrite, vec_len (fr->rewrite));
  b0->current_data = 0;
  b0->current_length = vec_len (fr->rewrite);
  b0->flags |= (VLIB_BUFFER_TOTAL_LENGTH_VALID | VLIB_BUFFER_FLOW_REPORT);
  vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
  vnet_buffer (b0)->sw_if_index[VLIB_TX] = frm->fib_index;

  tp = vlib_buffer_get_current (b0);
  ip = (ip4_header_t *) &tp->ip4;
  udp = (udp_header_t *) (ip+1);
  h = (ipfix_message_header_t *)(udp+1);

  /* FIXUP: message header export_time */ 
  h->export_time = (u32) 
    (((f64)frm->unix_time_0) + 
     (vlib_time_now(frm->vlib_main) - frm->vlib_time_0));
  h->export_time = clib_host_to_net_u32(h->export_time);

  stream = &frm->streams[fr->stream_index];

  /* FIXUP: message header sequence_number. Templates do not increase it */
  h->sequence_number = clib_host_to_net_u32(stream->sequence_number);

  /* FIXUP: udp length */
  udp->length = clib_host_to_net_u16 (b0->current_length - sizeof (*ip));

  if (frm->udp_checksum)
    {
      /* RFC 7011 section 10.3.2. */
      udp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip);
      if (udp->checksum == 0)
        udp->checksum = 0xffff;
    }

  *buffer_indexp = bi0;

  fr->last_template_sent = vlib_time_now (vm);

  return 0;
}

static uword
flow_report_process (vlib_main_t * vm,
                     vlib_node_runtime_t * rt,
                     vlib_frame_t * f)
{
  flow_report_main_t * frm = &flow_report_main;
  flow_report_t * fr;
  u32 ip4_lookup_node_index;
  vlib_node_t * ip4_lookup_node;
  vlib_frame_t * nf = 0;
  u32 template_bi;
  u32 * to_next;
  int send_template;
  f64 now;
  int rv;
  uword event_type;
  uword *event_data = 0;

  /* Wait for Godot... */
  vlib_process_wait_for_event_or_clock (vm, 1e9);
  event_type = vlib_process_get_events (vm, &event_data);
  if (event_type != 1)
      clib_warning ("bogus kickoff event received, %d", event_type);
  vec_reset_length (event_data);

  /* Enqueue pkts to ip4-lookup */
  ip4_lookup_node = vlib_get_node_by_name (vm, (u8 *) "ip4-lookup");
  ip4_lookup_node_index = ip4_lookup_node->index;

  while (1) 
    {
      vlib_process_wait_for_event_or_clock (vm, 5.0);
      event_type = vlib_process_get_events (vm, &event_data);
      vec_reset_length (event_data);
      
      vec_foreach (fr, frm->reports)
        {
          now = vlib_time_now (vm);

          /* Need to send a template packet? */
          send_template =
              now > (fr->last_template_sent + frm->template_interval);
          send_template += fr->last_template_sent == 0;
          template_bi = ~0;
	  rv = 0;

          if (send_template)
            rv = send_template_packet (frm, fr, &template_bi);

          if (rv < 0)
            continue;

          nf = vlib_get_frame_to_node (vm, ip4_lookup_node_index);
          nf->n_vectors = 0;
          to_next = vlib_frame_vector_args (nf);

          if (template_bi != ~0)
            {
              to_next[0] = template_bi;
              to_next++;
              nf->n_vectors++;
            }
      
          nf = fr->flow_data_callback (frm, fr, 
                                       nf, to_next, ip4_lookup_node_index);
          if (nf)
            vlib_put_frame_to_node (vm, ip4_lookup_node_index, nf);
        }
    }

  return 0; /* not so much */
}

VLIB_REGISTER_NODE (flow_report_process_node) = {
    .function = flow_report_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "flow-report-process",
};

int vnet_flow_report_add_del (flow_report_main_t *frm, 
                              vnet_flow_report_add_del_args_t *a,
			      u16 *template_id)
{
  int i;
  int found_index = ~0;
  flow_report_t *fr;
  flow_report_stream_t * stream;
  u32 si;
  
  si = find_stream(a->domain_id, a->src_port);
  if (si == -2)
    return VNET_API_ERROR_INVALID_VALUE;
  if (si == -1 && a->is_add == 0)
    return VNET_API_ERROR_NO_SUCH_ENTRY;

  for (i = 0; i < vec_len(frm->reports); i++)
    {
      fr = vec_elt_at_index (frm->reports, i);
      if (fr->opaque.as_uword == a->opaque.as_uword
          && fr->rewrite_callback == a->rewrite_callback
          && fr->flow_data_callback == a->flow_data_callback)
        {
          found_index = i;
          if (template_id)
            *template_id = fr->template_id;
          break;
        }
    }

  if (a->is_add == 0)
    {
      if (found_index != ~0)
        {
          vec_delete (frm->reports, 1, found_index);
          stream = &frm->streams[si];
          stream->n_reports--;
          if (stream->n_reports == 0)
            delete_stream(si);
          return 0;
        }
      return VNET_API_ERROR_NO_SUCH_ENTRY;
    }

  if (found_index != ~0)
    return VNET_API_ERROR_VALUE_EXIST;

  if (si == -1)
    {
      stream = add_stream();
      stream->domain_id = a->domain_id;
      stream->src_port = a->src_port;
      stream->sequence_number = 0;
      stream->n_reports = 0;
      si = stream - frm->streams;
    }
  else
    stream = &frm->streams[si];

  stream->n_reports++;

  vec_add2 (frm->reports, fr, 1);

  fr->stream_index = si;
  fr->template_id = 256 + stream->next_template_no;
  stream->next_template_no = (stream->next_template_no + 1) % (65536 - 256);
  fr->update_rewrite = 1;
  fr->opaque = a->opaque;
  fr->rewrite_callback = a->rewrite_callback;
  fr->flow_data_callback = a->flow_data_callback;

  if (template_id)
    *template_id = fr->template_id;

  return 0;
}

clib_error_t * flow_report_add_del_error_to_clib_error (int error)
{
    switch (error)
      {
      case 0:
	return 0;
      case VNET_API_ERROR_NO_SUCH_ENTRY:
        return clib_error_return (0, "Flow report not found");
      case VNET_API_ERROR_VALUE_EXIST:
        return clib_error_return (0, "Flow report already exists");
      case VNET_API_ERROR_INVALID_VALUE:
        return clib_error_return (0, "Expecting either still unused values "
                                     "for both domain_id and src_port "
                                     "or already used values for both fields");
      default:
        return clib_error_return (0, "vnet_flow_report_add_del returned %d",
                                  error);
      }
}

void vnet_flow_reports_reset (flow_report_main_t * frm)
{
  flow_report_t *fr;
  u32 i;

  for (i = 0; i < vec_len(frm->streams); i++)
    if (stream_index_valid(i))
      frm->streams[i].sequence_number = 0;

  vec_foreach (fr, frm->reports)
    {
      fr->update_rewrite = 1;
      fr->last_template_sent = 0;
    }
}

void vnet_stream_reset (flow_report_main_t * frm, u32 stream_index)
{
  flow_report_t *fr;

  frm->streams[stream_index].sequence_number = 0;

  vec_foreach (fr, frm->reports)
    if (frm->reports->stream_index == stream_index) {
      fr->update_rewrite = 1;
      fr->last_template_sent = 0;
    }
}

int vnet_stream_change (flow_report_main_t * frm,
                        u32 old_domain_id, u16 old_src_port,
                        u32 new_domain_id, u16 new_src_port)
{
  i32 stream_index = find_stream (old_domain_id, old_src_port);
  if (stream_index < 0)
    return 1;
  flow_report_stream_t * stream = &frm->streams[stream_index];
  stream->domain_id = new_domain_id;
  stream->src_port = new_src_port;
  if (old_domain_id != new_domain_id || old_src_port != new_src_port)
    vnet_stream_reset (frm, stream_index);
  return 0;
}

static clib_error_t *
set_ipfix_exporter_command_fn (vlib_main_t * vm,
                               unformat_input_t * input,
                               vlib_cli_command_t * cmd)
{
  flow_report_main_t * frm = &flow_report_main;
  ip4_address_t collector, src;
  u16 collector_port = UDP_DST_PORT_ipfix;
  u32 fib_id;
  u32 fib_index = ~0;
  
  collector.as_u32 = 0;
  src.as_u32 = 0;
  u32 path_mtu = 512; // RFC 7011 section 10.3.3.
  u32 template_interval = 20;
  u8 udp_checksum = 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
    if (unformat (input, "collector %U", unformat_ip4_address, &collector))
      ;
    else if (unformat (input, "port %u", &collector_port))
      ;
    else if (unformat (input, "src %U", unformat_ip4_address, &src))
      ;
    else if (unformat (input, "fib-id %u", &fib_id))
      {
        ip4_main_t * im = &ip4_main;
        uword * p = hash_get (im->fib_index_by_table_id, fib_id);
        if (! p)
          return clib_error_return (0, "fib ID %d doesn't exist\n",
                                    fib_id);
        fib_index = p[0];
      }
    else if (unformat (input, "path-mtu %u", &path_mtu))
      ;
    else if (unformat (input, "template-interval %u", &template_interval))
      ;
    else if (unformat (input, "udp-checksum"))
      udp_checksum = 1;
    else
      break;
  }
  
  if (collector.as_u32 != 0 && src.as_u32 == 0)
    return clib_error_return (0, "src address required");

  if (path_mtu > 1450 /* vpp does not support fragmentation */)
	return clib_error_return (0, "too big path-mtu value, maximum is 1450");

  if (path_mtu < 68)
	return clib_error_return (0, "too small path-mtu value, minimum is 68");

  /* Reset report streams if we are reconfiguring IP addresses */
  if (frm->ipfix_collector.as_u32 != collector.as_u32 ||
      frm->src_address.as_u32 != src.as_u32 ||
      frm->collector_port != collector_port)
    vnet_flow_reports_reset(frm);

  frm->ipfix_collector.as_u32 = collector.as_u32;
  frm->collector_port = collector_port;
  frm->src_address.as_u32 = src.as_u32;
  frm->fib_index = fib_index;
  frm->path_mtu = path_mtu;
  frm->template_interval = template_interval;
  frm->udp_checksum = udp_checksum;
  
  if (collector.as_u32)
    vlib_cli_output (vm, "Collector %U, src address %U, "
		           "fib index %d, path MTU %u, "
		           "template resend interval %us, "
		           "udp checksum %s",
                   format_ip4_address, &frm->ipfix_collector,
                   format_ip4_address, &frm->src_address,
                   fib_index, path_mtu, template_interval,
                   udp_checksum ? "enabled" : "disabled");
  else
    vlib_cli_output (vm, "IPFIX Collector is disabled");

  /* Turn on the flow reporting process */
  vlib_process_signal_event (vm, flow_report_process_node.index,
                             1, 0);
  return 0;
}

VLIB_CLI_COMMAND (set_ipfix_exporter_command, static) = {
    .path = "set ipfix exporter",
    .short_help = "set ipfix exporter "
                  "collector <ip4-address> [port <port>] "
                  "src <ip4-address> [fib-id <fib-id>] "
                  "[path-mtu <path-mtu>] "
                  "[template-interval <template-interval>]",
                  "[udp-checksum]",
    .function = set_ipfix_exporter_command_fn,
};


static clib_error_t *
ipfix_flush_command_fn (vlib_main_t * vm,
                        unformat_input_t * input,
                        vlib_cli_command_t * cmd)
{
  /* poke the flow reporting process */
  vlib_process_signal_event (vm, flow_report_process_node.index,
                             1, 0);
  return 0;
}

VLIB_CLI_COMMAND (ipfix_flush_command, static) = {
    .path = "ipfix flush",
    .short_help = "flush the current ipfix data [for make test]",
    .function = ipfix_flush_command_fn,
};

static clib_error_t * 
flow_report_init (vlib_main_t *vm)
{
  flow_report_main_t * frm = &flow_report_main;

  frm->vlib_main = vm;
  frm->vnet_main = vnet_get_main();
  frm->unix_time_0 = time(0);
  frm->vlib_time_0 = vlib_time_now(frm->vlib_main);
  frm->fib_index = ~0;

  return 0;
}

VLIB_INIT_FUNCTION (flow_report_init)