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authorNeale Ranns <nranns@cisco.com>2019-03-14 09:21:02 -0700
committerDamjan Marion <dmarion@me.com>2019-03-22 17:30:58 +0000
commit3e2e1907d485ed321f99350dd46e6822db6ac4d4 (patch)
tree044c4fb0540d21d915b53a70e971ff6c51f34ca5 /src/plugins
parent4759683744d079f868a6bcca8084eba8466620d7 (diff)
ADJ: more thorough link up check
Change-Id: I04dbfb914706b25fcc3bd6ee0d19cfdc810234ae Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/plugins')
-rw-r--r--src/plugins/unittest/bier_test.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/plugins/unittest/bier_test.c b/src/plugins/unittest/bier_test.c
index d15ee595b64..087da6fbe09 100644
--- a/src/plugins/unittest/bier_test.c
+++ b/src/plugins/unittest/bier_test.c
@@ -127,6 +127,9 @@ bier_test_mk_intf (u32 ninterfaces)
&tm->hw_if_indicies[i],
/* flag change */ 0);
+ error = vnet_hw_interface_set_flags(vnet_get_main(),
+ tm->hw_if_indicies[i],
+ VNET_HW_INTERFACE_FLAG_LINK_UP);
BIER_TEST((NULL == error), "ADD interface %d", i);
tm->hw[i] = vnet_get_hw_interface(vnet_get_main(),
>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 
/*
 * l2/l2_arp_term.c: IP v4 ARP L2 BD termination
 *
 * Copyright (c) 2010 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 <vlibmemory/api.h>

#include <vnet/l2/l2_arp_term.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/feat_bitmap.h>

#include <vnet/ip/ip4_packet.h>
#include <vnet/ethernet/arp_packet.h>

static const u8 vrrp_prefix[] = { 0x00, 0x00, 0x5E, 0x00, 0x01 };

l2_arp_term_main_t l2_arp_term_main;

/*
 * ARP/ND Termination in a L2 Bridge Domain based on IP4/IP6 to MAC
 * hash tables mac_by_ip4 and mac_by_ip6 for each BD.
 */
typedef enum
{
  ARP_TERM_NEXT_L2_OUTPUT,
  ARP_TERM_NEXT_DROP,
  ARP_TERM_N_NEXT,
} arp_term_next_t;

u32 arp_term_next_node_index[32];

typedef struct
{
  u8 packet_data[64];
} ethernet_arp_input_trace_t;

#define foreach_ethernet_arp_error					\
  _ (replies_sent, "ARP replies sent")					\
  _ (l2_type_not_ethernet, "L2 type not ethernet")			\
  _ (l3_type_not_ip4, "L3 type not IP4")				\
  _ (l3_src_address_not_local, "IP4 source address not local to subnet") \
  _ (l3_dst_address_not_local, "IP4 destination address not local to subnet") \
  _ (l3_dst_address_unset, "IP4 destination address is unset")          \
  _ (l3_src_address_is_local, "IP4 source address matches local interface") \
  _ (l3_src_address_learned, "ARP request IP4 source address learned")  \
  _ (replies_received, "ARP replies received")				\
  _ (opcode_not_request, "ARP opcode not request")                      \
  _ (proxy_arp_replies_sent, "Proxy ARP replies sent")			\
  _ (l2_address_mismatch, "ARP hw addr does not match L2 frame src addr") \
  _ (gratuitous_arp, "ARP probe or announcement dropped") \
  _ (interface_no_table, "Interface is not mapped to an IP table") \
  _ (interface_not_ip_enabled, "Interface is not IP enabled") \
  _ (unnumbered_mismatch, "RX interface is unnumbered to different subnet") \

typedef enum
{
#define _(sym,string) ETHERNET_ARP_ERROR_##sym,
  foreach_ethernet_arp_error
#undef _
    ETHERNET_ARP_N_ERROR,
} ethernet_arp_reply_error_t;

static char *ethernet_arp_error_strings[] = {
#define _(sym,string) string,
  foreach_ethernet_arp_error
#undef _
};

static u8 *
format_arp_term_input_trace (u8 * s, va_list * va)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
  ethernet_arp_input_trace_t *t = va_arg (*va, ethernet_arp_input_trace_t *);

  /* arp-term trace data saved is either arp or ip6/icmp6 packet:
     - for arp, the 1st 16-bit field is hw type of value of 0x0001.
     - for ip6, the first nibble has value of 6. */
  s = format (s, "%U", t->packet_data[0] == 0 ?
	      format_ethernet_arp_header : format_ip6_header,
	      t->packet_data, sizeof (t->packet_data));

  return s;
}

void
l2_arp_term_set_publisher_node (bool on)
{
  l2_arp_term_main_t *l2am = &l2_arp_term_main;

  l2am->publish = on;
}

static int
l2_arp_term_publish (l2_arp_term_publish_event_t * ctx)
{
  l2_arp_term_main_t *l2am = &l2_arp_term_main;

  vec_add1 (l2am->publish_events, *ctx);

  vlib_process_signal_event (vlib_get_main (),
			     l2_arp_term_process_node.index,
			     L2_ARP_TERM_EVENT_PUBLISH, 0);

  return 0;
}

static inline void
l2_arp_term_publish_v4_dp (u32 sw_if_index,
			   const ethernet_arp_ip4_over_ethernet_address_t * a)
{
  l2_arp_term_main_t *l2am = &l2_arp_term_main;

  if (!l2am->publish)
    return;

  l2_arp_term_publish_event_t args = {
    .sw_if_index = sw_if_index,
    .type = IP46_TYPE_IP4,
    .ip.ip4 = a->ip4,
    .mac = a->mac,
  };

  vl_api_rpc_call_main_thread (l2_arp_term_publish, (u8 *) & args,
			       sizeof (args));
}

static inline void
l2_arp_term_publish_v6_dp (u32 sw_if_index,
			   const ip6_address_t * addr,
			   const mac_address_t * mac)
{
  l2_arp_term_main_t *l2am = &l2_arp_term_main;

  if (!l2am->publish)
    return;

  l2_arp_term_publish_event_t args = {
    .sw_if_index = sw_if_index,
    .type = IP46_TYPE_IP6,
    .ip.ip6 = *addr,
    .mac = *mac,
  };

  vl_api_rpc_call_main_thread (l2_arp_term_publish, (u8 *) & args,
			       sizeof (args));
}

static inline int
vnet_ip6_nd_term (vlib_main_t * vm,
		  vlib_node_runtime_t * node,
		  vlib_buffer_t * p0,
		  ethernet_header_t * eth,
		  ip6_header_t * ip, u32 sw_if_index, u16 bd_index)
{
  icmp6_neighbor_solicitation_or_advertisement_header_t *ndh;
  mac_address_t mac;

  mac_address_from_bytes (&mac, eth->src_address);
  ndh = ip6_next_header (ip);
  if (ndh->icmp.type != ICMP6_neighbor_solicitation &&
      ndh->icmp.type != ICMP6_neighbor_advertisement)
    return 0;

  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
		     (p0->flags & VLIB_BUFFER_IS_TRACED)))
    {
      u8 *t0 = vlib_add_trace (vm, node, p0,
			       sizeof (icmp6_input_trace_t));
      clib_memcpy (t0, ip, sizeof (icmp6_input_trace_t));
    }

  /* Check if anyone want ND events for L2 BDs */
  if (PREDICT_FALSE (!ip6_address_is_link_local_unicast (&ip->src_address)))
    {
      l2_arp_term_publish_v6_dp (sw_if_index, &ip->src_address, &mac);
    }

  /* Check if MAC entry exsist for solicited target IP */
  if (ndh->icmp.type == ICMP6_neighbor_solicitation)
    {
      icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *opt;
      l2_bridge_domain_t *bd_config;
      u8 *macp;

      opt = (void *) (ndh + 1);
      if ((opt->header.type !=
	   ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address) ||
	  (opt->header.n_data_u64s != 1))
	return 0;		/* source link layer address option not present */

      bd_config = vec_elt_at_index (l2input_main.bd_configs, bd_index);
      macp =
	(u8 *) hash_get_mem (bd_config->mac_by_ip6, &ndh->target_address);
      if (macp)
	{			/* found ip-mac entry, generate eighbor advertisement response */
	  int bogus_length;
	  vlib_node_runtime_t *error_node =
	    vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
	  ip->dst_address = ip->src_address;
	  ip->src_address = ndh->target_address;
	  ip->hop_limit = 255;
	  opt->header.type =
	    ICMP6_NEIGHBOR_DISCOVERY_OPTION_target_link_layer_address;
	  clib_memcpy (opt->ethernet_address, macp, 6);
	  ndh->icmp.type = ICMP6_neighbor_advertisement;
	  ndh->advertisement_flags = clib_host_to_net_u32
	    (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED |
	     ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
	  ndh->icmp.checksum = 0;
	  ndh->icmp.checksum =
	    ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip, &bogus_length);
	  clib_memcpy (eth->dst_address, eth->src_address, 6);
	  clib_memcpy (eth->src_address, macp, 6);
	  vlib_error_count (vm, error_node->node_index,
			    ICMP6_ERROR_NEIGHBOR_ADVERTISEMENTS_TX, 1);
	  return 1;
	}
    }

  return 0;

}

static uword
arp_term_l2bd (vlib_main_t * vm,
	       vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  l2input_main_t *l2im = &l2input_main;
  u32 n_left_from, next_index, *from, *to_next;
  u32 n_replies_sent = 0;
  u16 last_bd_index = ~0;
  l2_bridge_domain_t *last_bd_config = 0;
  l2_input_config_t *cfg0;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  vlib_buffer_t *p0;
	  ethernet_header_t *eth0;
	  ethernet_arp_header_t *arp0;
	  ip6_header_t *iph0;
	  u8 *l3h0;
	  u32 pi0, error0, next0, sw_if_index0;
	  u16 ethertype0;
	  u16 bd_index0;
	  u32 ip0;
	  u8 *macp0;

	  pi0 = from[0];
	  to_next[0] = pi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  p0 = vlib_get_buffer (vm, pi0);
	  // Terminate only local (SHG == 0) ARP
	  if (vnet_buffer (p0)->l2.shg != 0)
	    goto next_l2_feature;

	  eth0 = vlib_buffer_get_current (p0);
	  l3h0 = (u8 *) eth0 + vnet_buffer (p0)->l2.l2_len;
	  ethertype0 = clib_net_to_host_u16 (*(u16 *) (l3h0 - 2));
	  arp0 = (ethernet_arp_header_t *) l3h0;

	  if (ethertype0 != ETHERNET_TYPE_ARP)
	    goto check_ip6_nd;

	  if ((arp0->opcode !=
	       clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_request)) &&
	      (arp0->opcode !=
	       clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply)))
	    goto check_ip6_nd;

	  /* Must be ARP request/reply packet here */
	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
			     (p0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      u8 *t0 = vlib_add_trace (vm, node, p0,
				       sizeof (ethernet_arp_input_trace_t));
	      clib_memcpy_fast (t0, l3h0,
				sizeof (ethernet_arp_input_trace_t));
	    }

	  error0 = 0;
	  error0 =
	    (arp0->l2_type !=
	     clib_net_to_host_u16 (ETHERNET_ARP_HARDWARE_TYPE_ethernet)
	     ? ETHERNET_ARP_ERROR_l2_type_not_ethernet : error0);
	  error0 =
	    (arp0->l3_type !=
	     clib_net_to_host_u16 (ETHERNET_TYPE_IP4) ?
	     ETHERNET_ARP_ERROR_l3_type_not_ip4 : error0);

	  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];

	  if (error0)
	    goto drop;

	  /* Trash ARP packets whose ARP-level source addresses do not
	     match, or if requester address is mcast */
	  if (PREDICT_FALSE
	      (!ethernet_mac_address_equal (eth0->src_address,
					    arp0->ip4_over_ethernet[0].
					    mac.bytes))
	      || ethernet_address_cast (arp0->ip4_over_ethernet[0].mac.bytes))
	    {
	      /* VRRP virtual MAC may be different to SMAC in ARP reply */
	      if (!ethernet_mac_address_equal
		  (arp0->ip4_over_ethernet[0].mac.bytes, vrrp_prefix))
		{
		  error0 = ETHERNET_ARP_ERROR_l2_address_mismatch;
		  goto drop;
		}
	    }
	  if (PREDICT_FALSE
	      (ip4_address_is_multicast (&arp0->ip4_over_ethernet[0].ip4)))
	    {
	      error0 = ETHERNET_ARP_ERROR_l3_src_address_not_local;
	      goto drop;
	    }

	  /* Check if anyone want ARP request events for L2 BDs */
	  l2_arp_term_publish_v4_dp (sw_if_index0,
				     &arp0->ip4_over_ethernet[0]);

	  /* lookup BD mac_by_ip4 hash table for MAC entry */
	  ip0 = arp0->ip4_over_ethernet[1].ip4.as_u32;
	  bd_index0 = vnet_buffer (p0)->l2.bd_index;
	  if (PREDICT_FALSE ((bd_index0 != last_bd_index)
			     || (last_bd_index == (u16) ~ 0)))
	    {
	      last_bd_index = bd_index0;
	      last_bd_config = vec_elt_at_index (l2im->bd_configs, bd_index0);
	    }
	  macp0 = (u8 *) hash_get (last_bd_config->mac_by_ip4, ip0);

	  if (PREDICT_FALSE (!macp0))
	    goto next_l2_feature;	/* MAC not found */
	  if (PREDICT_FALSE (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
			     arp0->ip4_over_ethernet[1].ip4.as_u32))
	    goto next_l2_feature;	/* GARP */

	  /* MAC found, send ARP reply -
	     Convert ARP request packet to ARP reply */
	  arp0->opcode = clib_host_to_net_u16 (ETHERNET_ARP_OPCODE_reply);
	  arp0->ip4_over_ethernet[1] = arp0->ip4_over_ethernet[0];
	  arp0->ip4_over_ethernet[0].ip4.as_u32 = ip0;
	  mac_address_from_bytes (&arp0->ip4_over_ethernet[0].mac, macp0);
	  clib_memcpy_fast (eth0->dst_address, eth0->src_address, 6);
	  clib_memcpy_fast (eth0->src_address, macp0, 6);
	  n_replies_sent += 1;

	output_response:
	  /* For BVI, need to use l2-fwd node to send ARP reply as
	     l2-output node cannot output packet to BVI properly */
	  cfg0 = vec_elt_at_index (l2im->configs, sw_if_index0);
	  if (PREDICT_FALSE (cfg0->bvi))
	    {
	      vnet_buffer (p0)->l2.feature_bitmap |= L2INPUT_FEAT_FWD;
	      vnet_buffer (p0)->sw_if_index[VLIB_RX] = 0;
	      goto next_l2_feature;
	    }

	  /* Send ARP/ND reply back out input interface through l2-output */
	  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
	  next0 = ARP_TERM_NEXT_L2_OUTPUT;
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next, pi0,
					   next0);
	  continue;

	check_ip6_nd:
	  /* IP6 ND event notification or solicitation handling to generate
	     local response instead of flooding */
	  iph0 = (ip6_header_t *) l3h0;
	  if (PREDICT_FALSE (ethertype0 == ETHERNET_TYPE_IP6 &&
			     iph0->protocol == IP_PROTOCOL_ICMP6 &&
			     !ip6_address_is_unspecified
			     (&iph0->src_address)))
	    {
	      sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
	      if (vnet_ip6_nd_term
		  (vm, node, p0, eth0, iph0, sw_if_index0,
		   vnet_buffer (p0)->l2.bd_index))
		goto output_response;
	    }

	next_l2_feature:
	  {
	    next0 = vnet_l2_feature_next (p0, arp_term_next_node_index,
					  L2INPUT_FEAT_ARP_TERM);
	    vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					     to_next, n_left_to_next,
					     pi0, next0);
	    continue;
	  }

	drop:
	  if (0 == arp0->ip4_over_ethernet[0].ip4.as_u32 ||
	      (arp0->ip4_over_ethernet[0].ip4.as_u32 ==
	       arp0->ip4_over_ethernet[1].ip4.as_u32))
	    {
	      error0 = ETHERNET_ARP_ERROR_gratuitous_arp;
	    }
	  next0 = ARP_TERM_NEXT_DROP;
	  p0->error = node->errors[error0];

	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next, pi0,
					   next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  vlib_error_count (vm, node->node_index,
		    ETHERNET_ARP_ERROR_replies_sent, n_replies_sent);
  return frame->n_vectors;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (arp_term_l2bd_node, static) = {
  .function = arp_term_l2bd,
  .name = "arp-term-l2bd",
  .vector_size = sizeof (u32),
  .n_errors = ETHERNET_ARP_N_ERROR,
  .error_strings = ethernet_arp_error_strings,
  .n_next_nodes = ARP_TERM_N_NEXT,
  .next_nodes = {
    [ARP_TERM_NEXT_L2_OUTPUT] = "l2-output",
    [ARP_TERM_NEXT_DROP] = "error-drop",
  },
  .format_buffer = format_ethernet_arp_header,
  .format_trace = format_arp_term_input_trace,
};
/* *INDENT-ON* */

clib_error_t *
arp_term_init (vlib_main_t * vm)
{
  // Initialize the feature next-node indexes
  feat_bitmap_init_next_nodes (vm,
			       arp_term_l2bd_node.index,
			       L2INPUT_N_FEAT,
			       l2input_get_feat_names (),
			       arp_term_next_node_index);
  return 0;
}

VLIB_INIT_FUNCTION (arp_term_init);

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