summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorVratko Polak <vrpolak@cisco.com>2020-03-09 18:30:02 +0100
committerPaul Vinciguerra <pvinci@vinciconsulting.com>2020-03-09 18:34:33 +0000
commit8e7fdddd34ef3c5f93f4ccba9660fa3d63994522 (patch)
tree08977ca07897001b462b5461f719091dc3e22a2e
parent49a11cff8e7892858d946d3f93ae19502236c358 (diff)
ip-neighbor: add description to the age parameter
Type: docs Change-Id: I311301328fb5e47ba1c3caaff18431738bbd1233 Signed-off-by: Vratko Polak <vrpolak@cisco.com>
Diffstat
-rw-r--r--src/vnet/ip-neighbor/ip_neighbor.api1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/vnet/ip-neighbor/ip_neighbor.api b/src/vnet/ip-neighbor/ip_neighbor.api
index 4d81a7c9f3a..b82036052f7 100644
--- a/src/vnet/ip-neighbor/ip_neighbor.api
+++ b/src/vnet/ip-neighbor/ip_neighbor.api
@@ -95,6 +95,7 @@ define ip_neighbor_dump
/** \brief IP neighboors dump response
@param context - sender context which was passed in the request
+ @param age - time between last update and sending this message, in seconds
@param neighbour - the neighbor
*/
define ip_neighbor_details {
/a> 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 
/*
 *------------------------------------------------------------------
 * af_packet.c - linux kernel packet interface
 *
 * Copyright (c) 2016 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.
 *------------------------------------------------------------------
 */

#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>

#include <vppinfra/linux/sysfs.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>

#include <vnet/devices/af_packet/af_packet.h>

af_packet_main_t af_packet_main;

#define AF_PACKET_TX_FRAMES_PER_BLOCK	1024
#define AF_PACKET_TX_FRAME_SIZE	 	(2048 * 5)
#define AF_PACKET_TX_BLOCK_NR		1
#define AF_PACKET_TX_FRAME_NR		(AF_PACKET_TX_BLOCK_NR * \
					 AF_PACKET_TX_FRAMES_PER_BLOCK)
#define AF_PACKET_TX_BLOCK_SIZE	 	(AF_PACKET_TX_FRAME_SIZE * \
					 AF_PACKET_TX_FRAMES_PER_BLOCK)

#define AF_PACKET_RX_FRAMES_PER_BLOCK	1024
#define AF_PACKET_RX_FRAME_SIZE	 	(2048 * 5)
#define AF_PACKET_RX_BLOCK_NR		1
#define AF_PACKET_RX_FRAME_NR		(AF_PACKET_RX_BLOCK_NR * \
					 AF_PACKET_RX_FRAMES_PER_BLOCK)
#define AF_PACKET_RX_BLOCK_SIZE		(AF_PACKET_RX_FRAME_SIZE * \
					 AF_PACKET_RX_FRAMES_PER_BLOCK)

/*defined in net/if.h but clashes with dpdk headers */
unsigned int if_nametoindex (const char *ifname);

typedef struct tpacket_req tpacket_req_t;

static u32
af_packet_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
			   u32 flags)
{
  clib_error_t *error;
  u8 *s;
  af_packet_main_t *apm = &af_packet_main;
  af_packet_if_t *apif =
    pool_elt_at_index (apm->interfaces, hi->dev_instance);

  if (ETHERNET_INTERFACE_FLAG_MTU == (flags & ETHERNET_INTERFACE_FLAG_MTU))
    {
      s = format (0, "/sys/class/net/%s/mtu%c", apif->host_if_name, 0);

      error = clib_sysfs_write ((char *) s, "%d", hi->max_packet_bytes);
      vec_free (s);

      if (error)
	{
	  vlib_log_err (apm->log_class,
			"sysfs write failed to change MTU: %U",
			format_clib_error, error);
	  clib_error_free (error);
	  return VNET_API_ERROR_SYSCALL_ERROR_1;
	}
    }

  return 0;
}

static clib_error_t *
af_packet_fd_read_ready (clib_file_t * uf)
{
  af_packet_main_t *apm = &af_packet_main;
  vnet_main_t *vnm = vnet_get_main ();
  u32 idx = uf->private_data;
  af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, idx);

  apm->pending_input_bitmap =
    clib_bitmap_set (apm->pending_input_bitmap, idx, 1);

  /* Schedule the rx node */
  vnet_device_input_set_interrupt_pending (vnm, apif->hw_if_index, 0);

  return 0;
}

static int
is_bridge (const u8 * host_if_name)
{
  u8 *s;
  DIR *dir = NULL;

  s = format (0, "/sys/class/net/%s/bridge%c", host_if_name, 0);
  dir = opendir ((char *) s);
  vec_free (s);

  if (dir)
    {
      closedir (dir);
      return 0;
    }

  return -1;
}

static int
create_packet_v2_sock (int host_if_index, tpacket_req_t * rx_req,
		       tpacket_req_t * tx_req, int *fd, u8 ** ring)
{
  af_packet_main_t *apm = &af_packet_main;
  int ret, err;
  struct sockaddr_ll sll;
  int ver = TPACKET_V2;
  socklen_t req_sz = sizeof (struct tpacket_req);
  u32 ring_sz = rx_req->tp_block_size * rx_req->tp_block_nr +
    tx_req->tp_block_size * tx_req->tp_block_nr;

  if ((*fd = socket (AF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) < 0)
    {
      vlib_log_debug (apm->log_class, "Failed to create socket");
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  /* bind before rx ring is cfged so we don't receive packets from other interfaces */
  clib_memset (&sll, 0, sizeof (sll));
  sll.sll_family = PF_PACKET;
  sll.sll_protocol = htons (ETH_P_ALL);
  sll.sll_ifindex = host_if_index;
  if ((err = bind (*fd, (struct sockaddr *) &sll, sizeof (sll))) < 0)
    {
      vlib_log_debug (apm->log_class,
		      "Failed to bind rx packet socket (error %d)", err);
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  if ((err =
       setsockopt (*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof (ver))) < 0)
    {
      vlib_log_debug (apm->log_class,
		      "Failed to set rx packet interface version");
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  int opt = 1;
  if ((err =
       setsockopt (*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof (opt))) < 0)
    {
      vlib_log_debug (apm->log_class,
		      "Failed to set packet tx ring error handling option");
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  if ((err =
       setsockopt (*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz)) < 0)
    {
      vlib_log_debug (apm->log_class, "Failed to set packet rx ring options");
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  if ((err =
       setsockopt (*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz)) < 0)
    {
      vlib_log_debug (apm->log_class, "Failed to set packet tx ring options");
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  *ring =
    mmap (NULL, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, *fd,
	  0);
  if (*ring == MAP_FAILED)
    {
      vlib_log_debug (apm->log_class, "mmap failure");
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  return 0;
error:
  if (*fd >= 0)
    close (*fd);
  *fd = -1;
  return ret;
}

int
af_packet_create_if (vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set,
		     u32 * sw_if_index)
{
  af_packet_main_t *apm = &af_packet_main;
  int ret, fd = -1, fd2 = -1;
  struct tpacket_req *rx_req = 0;
  struct tpacket_req *tx_req = 0;
  struct ifreq ifr;
  u8 *ring = 0;
  af_packet_if_t *apif = 0;
  u8 hw_addr[6];
  clib_error_t *error;
  vnet_sw_interface_t *sw;
  vnet_hw_interface_t *hw;
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  vnet_main_t *vnm = vnet_get_main ();
  uword *p;
  uword if_index;
  u8 *host_if_name_dup = vec_dup (host_if_name);
  int host_if_index = -1;

  p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
  if (p)
    {
      apif = vec_elt_at_index (apm->interfaces, p[0]);
      *sw_if_index = apif->sw_if_index;
      return VNET_API_ERROR_IF_ALREADY_EXISTS;
    }

  vec_validate (rx_req, 0);
  rx_req->tp_block_size = AF_PACKET_RX_BLOCK_SIZE;
  rx_req->tp_frame_size = AF_PACKET_RX_FRAME_SIZE;
  rx_req->tp_block_nr = AF_PACKET_RX_BLOCK_NR;
  rx_req->tp_frame_nr = AF_PACKET_RX_FRAME_NR;

  vec_validate (tx_req, 0);
  tx_req->tp_block_size = AF_PACKET_TX_BLOCK_SIZE;
  tx_req->tp_frame_size = AF_PACKET_TX_FRAME_SIZE;
  tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR;
  tx_req->tp_frame_nr = AF_PACKET_TX_FRAME_NR;

  /*
   * make sure host side of interface is 'UP' before binding AF_PACKET
   * socket on it.
   */
  if ((fd2 = socket (AF_UNIX, SOCK_DGRAM, 0)) < 0)
    {
      vlib_log_debug (apm->log_class, "Failed to create socket");
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  clib_memcpy (ifr.ifr_name, (const char *) host_if_name,
	       vec_len (host_if_name));
  if ((ret = ioctl (fd2, SIOCGIFINDEX, &ifr)) < 0)
    {
      vlib_log_debug (apm->log_class, "af_packet_create error: %d", ret);
      close (fd2);
      return VNET_API_ERROR_INVALID_INTERFACE;
    }

  host_if_index = ifr.ifr_ifindex;
  if ((ret = ioctl (fd2, SIOCGIFFLAGS, &ifr)) < 0)
    {
      vlib_log_warn (apm->log_class, "af_packet_create error: %d", ret);
      goto error;
    }

  if (!(ifr.ifr_flags & IFF_UP))
    {
      ifr.ifr_flags |= IFF_UP;
      if ((ret = ioctl (fd2, SIOCSIFFLAGS, &ifr)) < 0)
	{
	  vlib_log_warn (apm->log_class, "af_packet_create error: %d", ret);
	  goto error;
	}
    }

  if (fd2 > -1)
    close (fd2);

  ret = create_packet_v2_sock (host_if_index, rx_req, tx_req, &fd, &ring);

  if (ret != 0)
    goto error;

  ret = is_bridge (host_if_name);

  if (ret == 0)			/* is a bridge, ignore state */
    host_if_index = -1;

  /* So far everything looks good, let's create interface */
  pool_get (apm->interfaces, apif);
  if_index = apif - apm->interfaces;

  apif->host_if_index = host_if_index;
  apif->fd = fd;
  apif->rx_ring = ring;
  apif->tx_ring = ring + rx_req->tp_block_size * rx_req->tp_block_nr;
  apif->rx_req = rx_req;
  apif->tx_req = tx_req;
  apif->host_if_name = host_if_name_dup;
  apif->per_interface_next_index = ~0;
  apif->next_tx_frame = 0;
  apif->next_rx_frame = 0;

  if (tm->n_vlib_mains > 1)
    clib_spinlock_init (&apif->lockp);

  {
    clib_file_t template = { 0 };
    template.read_function = af_packet_fd_read_ready;
    template.file_descriptor = fd;
    template.private_data = if_index;
    template.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED;
    template.description = format (0, "%U", format_af_packet_device_name,
				   if_index);
    apif->clib_file_index = clib_file_add (&file_main, &template);
  }

  /*use configured or generate random MAC address */
  if (hw_addr_set)
    clib_memcpy (hw_addr, hw_addr_set, 6);
  else
    {
      f64 now = vlib_time_now (vm);
      u32 rnd;
      rnd = (u32) (now * 1e6);
      rnd = random_u32 (&rnd);

      clib_memcpy (hw_addr + 2, &rnd, sizeof (rnd));
      hw_addr[0] = 2;
      hw_addr[1] = 0xfe;
    }

  error = ethernet_register_interface (vnm, af_packet_device_class.index,
				       if_index, hw_addr, &apif->hw_if_index,
				       af_packet_eth_flag_change);

  if (error)
    {
      clib_memset (apif, 0, sizeof (*apif));
      pool_put (apm->interfaces, apif);
      vlib_log_err (apm->log_class, "Unable to register interface: %U",
		    format_clib_error, error);
      clib_error_free (error);
      ret = VNET_API_ERROR_SYSCALL_ERROR_1;
      goto error;
    }

  sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index);
  hw = vnet_get_hw_interface (vnm, apif->hw_if_index);
  apif->sw_if_index = sw->sw_if_index;
  vnet_hw_interface_set_input_node (vnm, apif->hw_if_index,
				    af_packet_input_node.index);

  vnet_hw_interface_assign_rx_thread (vnm, apif->hw_if_index, 0,	/* queue */
				      ~0 /* any cpu */ );

  hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
  vnet_hw_interface_set_flags (vnm, apif->hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);

  vnet_hw_interface_set_rx_mode (vnm, apif->hw_if_index, 0,
				 VNET_HW_INTERFACE_RX_MODE_INTERRUPT);

  mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name_dup, &if_index,
		 0);
  if (sw_if_index)
    *sw_if_index = apif->sw_if_index;

  return 0;

error:
  if (fd2 > -1)
    close (fd2);
  vec_free (host_if_name_dup);
  vec_free (rx_req);
  vec_free (tx_req);
  return ret;
}

int
af_packet_delete_if (vlib_main_t * vm, u8 * host_if_name)
{
  vnet_main_t *vnm = vnet_get_main ();
  af_packet_main_t *apm = &af_packet_main;
  af_packet_if_t *apif;
  uword *p;
  uword if_index;
  u32 ring_sz;

  p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
  if (p == NULL)
    {
      vlib_log_warn (apm->log_class, "Host interface %s does not exist",
		     host_if_name);
      return VNET_API_ERROR_SYSCALL_ERROR_1;
    }
  apif = pool_elt_at_index (apm->interfaces, p[0]);
  if_index = apif - apm->interfaces;

  /* bring down the interface */
  vnet_hw_interface_set_flags (vnm, apif->hw_if_index, 0);
  vnet_hw_interface_unassign_rx_thread (vnm, apif->hw_if_index, 0);

  /* clean up */
  if (apif->clib_file_index != ~0)
    {
      clib_file_del (&file_main, file_main.file_pool + apif->clib_file_index);
      apif->clib_file_index = ~0;
    }
  else
    close (apif->fd);

  ring_sz = apif->rx_req->tp_block_size * apif->rx_req->tp_block_nr +
    apif->tx_req->tp_block_size * apif->tx_req->tp_block_nr;
  if (munmap (apif->rx_ring, ring_sz))
    vlib_log_warn (apm->log_class,
		   "Host interface %s could not free rx/tx ring",
		   host_if_name);
  apif->rx_ring = NULL;
  apif->tx_ring = NULL;
  apif->fd = -1;

  vec_free (apif->rx_req);
  apif->rx_req = NULL;
  vec_free (apif->tx_req);
  apif->tx_req = NULL;

  vec_free (apif->host_if_name);
  apif->host_if_name = NULL;
  apif->host_if_index = -1;

  mhash_unset (&apm->if_index_by_host_if_name, host_if_name, &if_index);

  ethernet_delete_interface (vnm, apif->hw_if_index);

  pool_put (apm->interfaces, apif);

  return 0;
}

int
af_packet_set_l4_cksum_offload (vlib_main_t * vm, u32 sw_if_index, u8 set)
{
  vnet_main_t *vnm = vnet_get_main ();
  vnet_hw_interface_t *hw;

  hw = vnet_get_sup_hw_interface (vnm, sw_if_index);

  if (hw->dev_class_index != af_packet_device_class.index)
    return VNET_API_ERROR_INVALID_INTERFACE;

  if (set)
    hw->flags &= ~VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD;
  else
    hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD;

  return 0;
}

int
af_packet_dump_ifs (af_packet_if_detail_t ** out_af_packet_ifs)
{
  af_packet_main_t *apm = &af_packet_main;
  af_packet_if_t *apif;
  af_packet_if_detail_t *r_af_packet_ifs = NULL;
  af_packet_if_detail_t *af_packet_if = NULL;

  vec_foreach (apif, apm->interfaces)
  {
    vec_add2 (r_af_packet_ifs, af_packet_if, 1);
    af_packet_if->sw_if_index = apif->sw_if_index;
    if (apif->host_if_name)
      {
	clib_memcpy (af_packet_if->host_if_name, apif->host_if_name,
		     MIN (ARRAY_LEN (af_packet_if->host_if_name) - 1,
			  strlen ((const char *) apif->host_if_name)));
      }
  }

  *out_af_packet_ifs = r_af_packet_ifs;

  return 0;
}

static clib_error_t *
af_packet_init (vlib_main_t * vm)
{
  af_packet_main_t *apm = &af_packet_main;
  vlib_thread_main_t *tm = vlib_get_thread_main ();

  clib_memset (apm, 0, sizeof (af_packet_main_t));

  mhash_init_vec_string (&apm->if_index_by_host_if_name, sizeof (uword));

  vec_validate_aligned (apm->rx_buffers, tm->n_vlib_mains - 1,
			CLIB_CACHE_LINE_BYTES);

  apm->log_class = vlib_log_register_class ("af_packet", 0);
  vlib_log_debug (apm->log_class, "initialized");

  return 0;
}

VLIB_INIT_FUNCTION (af_packet_init);

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */