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authorFlorin Coras <fcoras@cisco.com>2019-02-08 18:27:29 -0800
committerDamjan Marion <dmarion@me.com>2019-02-11 16:05:37 +0000
commitc1a4265b4b76bf7874b53e866549371c8daf70f4 (patch)
treecce5e97b1b36433d4211fd05b2b4794a40bccf76 /src/vnet/session/session_lookup.h
parentc69ac31208059a8ed8b9ef6056b6aaf6e6629cb8 (diff)
session: cleanup application interface
Change-Id: I89d240753b3f3c5e984aa303a7c8fa35fa59bf7f Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/session/session_lookup.h')
-rw-r--r--src/vnet/session/session_lookup.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vnet/session/session_lookup.h b/src/vnet/session/session_lookup.h
index 995d2aaf980..c45794dfe71 100644
--- a/src/vnet/session/session_lookup.h
+++ b/src/vnet/session/session_lookup.h
@@ -123,7 +123,7 @@ typedef struct _session_rule_add_del_args
u8 transport_proto;
} session_rule_add_del_args_t;
-clib_error_t *vnet_session_rule_add_del (session_rule_add_del_args_t * args);
+int vnet_session_rule_add_del (session_rule_add_del_args_t * args);
void session_lookup_set_tables_appns (app_namespace_t * app_ns);
void session_lookup_init (void);
n190'>190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 
/*
 * gre.c: gre
 *
 * Copyright (c) 2012 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 <vnet/vnet.h>
#include <vnet/gre/gre.h>
#include <vnet/adj/adj_midchain.h>

#ifndef CLIB_MARCH_VARIANT
gre_main_t gre_main;

typedef struct
{
  union
  {
    ip4_and_gre_header_t ip4_and_gre;
    u64 as_u64[3];
  };
} ip4_and_gre_union_t;

typedef struct
{
  union
  {
    ip6_and_gre_header_t ip6_and_gre;
    u64 as_u64[3];
  };
} ip6_and_gre_union_t;
#endif /* CLIB_MARCH_VARIANT */


/* Packet trace structure */
typedef struct
{
  /* Tunnel-id / index in tunnel vector */
  u32 tunnel_id;

  /* pkt length */
  u32 length;

  /* tunnel ip addresses */
  ip46_address_t src;
  ip46_address_t dst;
} gre_tx_trace_t;

static u8 *
format_gre_tx_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  gre_tx_trace_t *t = va_arg (*args, gre_tx_trace_t *);

  s = format (s, "GRE: tunnel %d len %d src %U dst %U",
	      t->tunnel_id, t->length,
	      format_ip46_address, &t->src, IP46_TYPE_ANY,
	      format_ip46_address, &t->dst, IP46_TYPE_ANY);
  return s;
}

#ifndef CLIB_MARCH_VARIANT
u8 *
format_gre_protocol (u8 * s, va_list * args)
{
  gre_protocol_t p = va_arg (*args, u32);
  gre_main_t *gm = &gre_main;
  gre_protocol_info_t *pi = gre_get_protocol_info (gm, p);

  if (pi)
    s = format (s, "%s", pi->name);
  else
    s = format (s, "0x%04x", p);

  return s;
}

u8 *
format_gre_header_with_length (u8 * s, va_list * args)
{
  gre_main_t *gm = &gre_main;
  gre_header_t *h = va_arg (*args, gre_header_t *);
  u32 max_header_bytes = va_arg (*args, u32);
  gre_protocol_t p = clib_net_to_host_u16 (h->protocol);
  u32 indent, header_bytes;

  header_bytes = sizeof (h[0]);
  if (max_header_bytes != 0 && header_bytes > max_header_bytes)
    return format (s, "gre header truncated");

  indent = format_get_indent (s);

  s = format (s, "GRE %U", format_gre_protocol, p);

  if (max_header_bytes != 0 && header_bytes < max_header_bytes)
    {
      gre_protocol_info_t *pi = gre_get_protocol_info (gm, p);
      vlib_node_t *node = vlib_get_node (gm->vlib_main, pi->node_index);
      if (node->format_buffer)
	s = format (s, "\n%U%U",
		    format_white_space, indent,
		    node->format_buffer, (void *) (h + 1),
		    max_header_bytes - header_bytes);
    }

  return s;
}

u8 *
format_gre_header (u8 * s, va_list * args)
{
  gre_header_t *h = va_arg (*args, gre_header_t *);
  return format (s, "%U", format_gre_header_with_length, h, 0);
}

/* Returns gre protocol as an int in host byte order. */
uword
unformat_gre_protocol_host_byte_order (unformat_input_t * input,
				       va_list * args)
{
  u16 *result = va_arg (*args, u16 *);
  gre_main_t *gm = &gre_main;
  int i;

  /* Named type. */
  if (unformat_user (input, unformat_vlib_number_by_name,
		     gm->protocol_info_by_name, &i))
    {
      gre_protocol_info_t *pi = vec_elt_at_index (gm->protocol_infos, i);
      *result = pi->protocol;
      return 1;
    }

  return 0;
}

uword
unformat_gre_protocol_net_byte_order (unformat_input_t * input,
				      va_list * args)
{
  u16 *result = va_arg (*args, u16 *);
  if (!unformat_user (input, unformat_gre_protocol_host_byte_order, result))
    return 0;
  *result = clib_host_to_net_u16 ((u16) * result);
  return 1;
}

uword
unformat_gre_header (unformat_input_t * input, va_list * args)
{
  u8 **result = va_arg (*args, u8 **);
  gre_header_t _h, *h = &_h;
  u16 p;

  if (!unformat (input, "%U", unformat_gre_protocol_host_byte_order, &p))
    return 0;

  h->protocol = clib_host_to_net_u16 (p);

  /* Add header to result. */
  {
    void *p;
    u32 n_bytes = sizeof (h[0]);

    vec_add2 (*result, p, n_bytes);
    clib_memcpy (p, h, n_bytes);
  }

  return 1;
}

static int
gre_proto_from_vnet_link (vnet_link_t link)
{
  switch (link)
    {
    case VNET_LINK_IP4:
      return (GRE_PROTOCOL_ip4);
    case VNET_LINK_IP6:
      return (GRE_PROTOCOL_ip6);
    case VNET_LINK_MPLS:
      return (GRE_PROTOCOL_mpls_unicast);
    case VNET_LINK_ETHERNET:
      return (GRE_PROTOCOL_teb);
    case VNET_LINK_ARP:
      return (GRE_PROTOCOL_arp);
    case VNET_LINK_NSH:
      ASSERT (0);
      break;
    }
  ASSERT (0);
  return (GRE_PROTOCOL_ip4);
}

static u8 *
gre_build_rewrite (vnet_main_t * vnm,
		   u32 sw_if_index,
		   vnet_link_t link_type, const void *dst_address)
{
  gre_main_t *gm = &gre_main;
  ip4_and_gre_header_t *h4;
  ip6_and_gre_header_t *h6;
  gre_header_t *gre;
  u8 *rewrite = NULL;
  gre_tunnel_t *t;
  u32 ti;
  u8 is_ipv6;

  ti = gm->tunnel_index_by_sw_if_index[sw_if_index];

  if (~0 == ti)
    /* not one of ours */
    return (0);

  t = pool_elt_at_index (gm->tunnels, ti);

  is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0;

  if (!is_ipv6)
    {
      vec_validate (rewrite, sizeof (*h4) - 1);
      h4 = (ip4_and_gre_header_t *) rewrite;
      gre = &h4->gre;
      h4->ip4.ip_version_and_header_length = 0x45;
      h4->ip4.ttl = 254;
      h4->ip4.protocol = IP_PROTOCOL_GRE;
      /* fixup ip4 header length and checksum after-the-fact */
      h4->ip4.src_address.as_u32 = t->tunnel_src.ip4.as_u32;
      h4->ip4.dst_address.as_u32 = t->tunnel_dst.fp_addr.ip4.as_u32;
      h4->ip4.checksum = ip4_header_checksum (&h4->ip4);
    }
  else
    {
      vec_validate (rewrite, sizeof (*h6) - 1);
      h6 = (ip6_and_gre_header_t *) rewrite;
      gre = &h6->gre;
      h6->ip6.ip_version_traffic_class_and_flow_label =
	clib_host_to_net_u32 (6 << 28);
      h6->ip6.hop_limit = 255;
      h6->ip6.protocol = IP_PROTOCOL_GRE;
      /* fixup ip6 header length and checksum after-the-fact */
      h6->ip6.src_address.as_u64[0] = t->tunnel_src.ip6.as_u64[0];
      h6->ip6.src_address.as_u64[1] = t->tunnel_src.ip6.as_u64[1];
      h6->ip6.dst_address.as_u64[0] = t->tunnel_dst.fp_addr.ip6.as_u64[0];
      h6->ip6.dst_address.as_u64[1] = t->tunnel_dst.fp_addr.ip6.as_u64[1];
    }

  if (PREDICT_FALSE (t->type == GRE_TUNNEL_TYPE_ERSPAN))
    {
      gre->protocol = clib_host_to_net_u16 (GRE_PROTOCOL_erspan);
      gre->flags_and_version = clib_host_to_net_u16 (GRE_FLAGS_SEQUENCE);
    }
  else
    gre->protocol =
      clib_host_to_net_u16 (gre_proto_from_vnet_link (link_type));

  return (rewrite);
}

#define is_v4_packet(_h) ((*(u8*) _h) & 0xF0) == 0x40

static void
gre4_fixup (vlib_main_t * vm,
	    ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
{
  ip4_header_t *ip0;

  ip0 = vlib_buffer_get_current (b0);

  /* Fixup the checksum and len fields in the GRE tunnel encap
   * that was applied at the midchain node */
  ip0->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
  ip0->checksum = ip4_header_checksum (ip0);
}

static void
gre6_fixup (vlib_main_t * vm,
	    ip_adjacency_t * adj, vlib_buffer_t * b0, const void *data)
{
  ip6_header_t *ip0;

  ip0 = vlib_buffer_get_current (b0);

  /* Fixup the payload length field in the GRE tunnel encap that was applied
   * at the midchain node */
  ip0->payload_length =
    clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
			  sizeof (*ip0));
}

void
gre_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
{
  gre_main_t *gm = &gre_main;
  gre_tunnel_t *t;
  adj_flags_t af;
  u8 is_ipv6;
  u32 ti;

  ti = gm->tunnel_index_by_sw_if_index[sw_if_index];
  t = pool_elt_at_index (gm->tunnels, ti);
  is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0;
  af = ADJ_FLAG_MIDCHAIN_IP_STACK;

  if (VNET_LINK_ETHERNET == adj_get_link_type (ai))
    af |= ADJ_FLAG_MIDCHAIN_NO_COUNT;

  adj_nbr_midchain_update_rewrite
    (ai, !is_ipv6 ? gre4_fixup : gre6_fixup, NULL, af,
     gre_build_rewrite (vnm, sw_if_index, adj_get_link_type (ai), NULL));

  gre_tunnel_stack (ai);
}
#endif /* CLIB_MARCH_VARIANT */


typedef enum
{
  GRE_ENCAP_NEXT_L2_MIDCHAIN,
  GRE_ENCAP_N_NEXT,
} gre_encap_next_t;

/**
 * @brief TX function. Only called for L2 payload including TEB or ERSPAN.
 *        L3 traffic uses the adj-midchains.
 */
VLIB_NODE_FN (gre_encap_node) (vlib_main_t * vm,
			       vlib_node_runtime_t * node,
			       vlib_frame_t * frame)
{
  gre_main_t *gm = &gre_main;
  vnet_main_t *vnm = gm->vnet_main;
  u32 next_index;
  u32 *from, *to_next, n_left_from, n_left_to_next;
  u32 sw_if_index0 = ~0;
  u32 sw_if_index1 = ~0;
  adj_index_t adj_index0 = ADJ_INDEX_INVALID;
  adj_index_t adj_index1 = ADJ_INDEX_INVALID;
  gre_tunnel_t *gt0 = NULL;
  gre_tunnel_t *gt1 = NULL;

  /* Vector of buffer / pkt indices we're supposed to process */
  from = vlib_frame_vector_args (frame);

  /* Number of buffers / pkts */
  n_left_from = frame->n_vectors;

  /* Speculatively send the first buffer to the last disposition we used */
  next_index = GRE_ENCAP_NEXT_L2_MIDCHAIN;

  while (n_left_from > 0)
    {
      /* set up to enqueue to our disposition with index = next_index */
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	  u32 bi0 = from[0];
	  u32 bi1 = from[1];
	  vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
	  vlib_buffer_t *b1 = vlib_get_buffer (vm, bi1);

	  to_next[0] = bi0;
	  to_next[1] = bi1;
	  from += 2;
	  to_next += 2;
	  n_left_to_next -= 2;
	  n_left_from -= 2;

	  if (sw_if_index0 != vnet_buffer (b0)->sw_if_index[VLIB_TX])
	    {
	      sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
	      vnet_hw_interface_t *hi0 =
		vnet_get_sup_hw_interface (vnm, sw_if_index0);
	      gt0 = &gm->tunnels[hi0->dev_instance];
	      adj_index0 = gt0->l2_adj_index;
	    }

	  if (sw_if_index1 != vnet_buffer (b1)->sw_if_index[VLIB_TX])
	    {
	      if (sw_if_index0 == vnet_buffer (b1)->sw_if_index[VLIB_TX])
		{
		  sw_if_index1 = sw_if_index0;
		  gt1 = gt0;
		  adj_index1 = adj_index0;
		}
	      else
		{
		  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX];
		  vnet_hw_interface_t *hi1 =
		    vnet_get_sup_hw_interface (vnm, sw_if_index1);
		  gt1 = &gm->tunnels[hi1->dev_instance];
		  adj_index1 = gt1->l2_adj_index;
		}
	    }

	  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = adj_index0;
	  vnet_buffer (b1)->ip.adj_index[VLIB_TX] = adj_index1;

	  if (PREDICT_FALSE (gt0->type == GRE_TUNNEL_TYPE_ERSPAN))
	    {
	      /* Encap GRE seq# and ERSPAN type II header */
	      vlib_buffer_advance (b0, -sizeof (erspan_t2_t));
	      erspan_t2_t *h0 = vlib_buffer_get_current (b0);
	      u32 seq_num = clib_atomic_fetch_add (&gt0->gre_sn->seq_num, 1);
	      u64 hdr = clib_host_to_net_u64 (ERSPAN_HDR2);
	      h0->seq_num = clib_host_to_net_u32 (seq_num);
	      h0->t2_u64 = hdr;
	      h0->t2.cos_en_t_session |=
		clib_host_to_net_u16 (gt0->session_id);
	    }
	  if (PREDICT_FALSE (gt1->type == GRE_TUNNEL_TYPE_ERSPAN))
	    {
	      /* Encap GRE seq# and ERSPAN type II header */
	      vlib_buffer_advance (b1, -sizeof (erspan_t2_t));
	      erspan_t2_t *h1 = vlib_buffer_get_current (b1);
	      u32 seq_num = clib_atomic_fetch_add (&gt1->gre_sn->seq_num, 1);
	      u64 hdr = clib_host_to_net_u64 (ERSPAN_HDR2);
	      h1->seq_num = clib_host_to_net_u32 (seq_num);
	      h1->t2_u64 = hdr;
	      h1->t2.cos_en_t_session |=
		clib_host_to_net_u16 (gt1->session_id);
	    }

	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      gre_tx_trace_t *tr0 = vlib_add_trace (vm, node,
						    b0, sizeof (*tr0));
	      tr0->tunnel_id = gt0 - gm->tunnels;
	      tr0->src = gt0->tunnel_src;
	      tr0->dst = gt0->tunnel_dst.fp_addr;
	      tr0->length = vlib_buffer_length_in_chain (vm, b0);
	    }
	  if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      gre_tx_trace_t *tr1 = vlib_add_trace (vm, node,
						    b1, sizeof (*tr1));
	      tr1->tunnel_id = gt1 - gm->tunnels;
	      tr1->src = gt1->tunnel_src;
	      tr1->dst = gt1->tunnel_dst.fp_addr;
	      tr1->length = vlib_buffer_length_in_chain (vm, b1);
	    }
	}

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0 = from[0];
	  vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);

	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  if (sw_if_index0 != vnet_buffer (b0)->sw_if_index[VLIB_TX])
	    {
	      sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
	      vnet_hw_interface_t *hi0 =
		vnet_get_sup_hw_interface (vnm, sw_if_index0);
	      gt0 = &gm->tunnels[hi0->dev_instance];
	      adj_index0 = gt0->l2_adj_index;
	    }

	  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = adj_index0;

	  if (PREDICT_FALSE (gt0->type == GRE_TUNNEL_TYPE_ERSPAN))
	    {
	      /* Encap GRE seq# and ERSPAN type II header */
	      vlib_buffer_advance (b0, -sizeof (erspan_t2_t));
	      erspan_t2_t *h0 = vlib_buffer_get_current (b0);
	      u32 seq_num = clib_atomic_fetch_add (&gt0->gre_sn->seq_num, 1);
	      u64 hdr = clib_host_to_net_u64 (ERSPAN_HDR2);
	      h0->seq_num = clib_host_to_net_u32 (seq_num);
	      h0->t2_u64 = hdr;
	      h0->t2.cos_en_t_session |=
		clib_host_to_net_u16 (gt0->session_id);
	    }

	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      gre_tx_trace_t *tr = vlib_add_trace (vm, node,
						   b0, sizeof (*tr));
	      tr->tunnel_id = gt0 - gm->tunnels;
	      tr->src = gt0->tunnel_src;
	      tr->dst = gt0->tunnel_dst.fp_addr;
	      tr->length = vlib_buffer_length_in_chain (vm, b0);
	    }
	}

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

  vlib_node_increment_counter (vm, node->node_index,
			       GRE_ERROR_PKTS_ENCAP, frame->n_vectors);

  return frame->n_vectors;
}

static char *gre_error_strings[] = {
#define gre_error(n,s) s,
#include "error.def"
#undef gre_error
};

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (gre_encap_node) =
{
  .name = "gre-encap",
  .vector_size = sizeof (u32),
  .format_trace = format_gre_tx_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = GRE_N_ERROR,
  .error_strings = gre_error_strings,
  .n_next_nodes = GRE_ENCAP_N_NEXT,
  .next_nodes = {
    [GRE_ENCAP_NEXT_L2_MIDCHAIN] = "adj-l2-midchain",
  },
};
/* *INDENT-ON* */

static u8 *
format_gre_tunnel_name (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  gre_main_t *gm = &gre_main;
  gre_tunnel_t *t;

  if (dev_instance >= vec_len (gm->tunnels))
    return format (s, "<improperly-referenced>");

  t = pool_elt_at_index (gm->tunnels, dev_instance);
  return format (s, "gre%d", t->user_instance);
}

static u8 *
format_gre_device (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  CLIB_UNUSED (int verbose) = va_arg (*args, int);

  s = format (s, "GRE tunnel: id %d\n", dev_instance);
  return s;
}

/* *INDENT-OFF* */
VNET_DEVICE_CLASS (gre_device_class) = {
  .name = "GRE tunnel device",
  .format_device_name = format_gre_tunnel_name,
  .format_device = format_gre_device,
  .format_tx_trace = format_gre_tx_trace,
  .admin_up_down_function = gre_interface_admin_up_down,
#ifdef SOON
  .clear counter = 0;
#endif
};

#ifndef CLIB_MARCH_VARIANT
VNET_HW_INTERFACE_CLASS (gre_hw_interface_class) = {
  .name = "GRE",
  .format_header = format_gre_header_with_length,
  .unformat_header = unformat_gre_header,
  .build_rewrite = gre_build_rewrite,
  .update_adjacency = gre_update_adj,
  .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
};
/* *INDENT-ON* */

static void
add_protocol (gre_main_t * gm, gre_protocol_t protocol, char *protocol_name)
{
  gre_protocol_info_t *pi;
  u32 i;

  vec_add2 (gm->protocol_infos, pi, 1);
  i = pi - gm->protocol_infos;

  pi->name = protocol_name;
  pi->protocol = protocol;
  pi->next_index = pi->node_index = ~0;

  hash_set (gm->protocol_info_by_protocol, protocol, i);
  hash_set_mem (gm->protocol_info_by_name, pi->name, i);
}

static clib_error_t *
gre_init (vlib_main_t * vm)
{
  gre_main_t *gm = &gre_main;
  clib_error_t *error;
  ip_main_t *im = &ip_main;
  ip_protocol_info_t *pi;

  clib_memset (gm, 0, sizeof (gm[0]));
  gm->vlib_main = vm;
  gm->vnet_main = vnet_get_main ();

  if ((error = vlib_call_init_function (vm, ip_main_init)))
    return error;

  if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
    return error;

  if ((error = vlib_call_init_function (vm, ip6_lookup_init)))
    return error;

  /* Set up the ip packet generator */
  pi = ip_get_protocol_info (im, IP_PROTOCOL_GRE);
  pi->format_header = format_gre_header;
  pi->unformat_pg_edit = unformat_pg_gre_header;

  gm->protocol_info_by_name = hash_create_string (0, sizeof (uword));
  gm->protocol_info_by_protocol = hash_create (0, sizeof (uword));
  gm->tunnel_by_key4 =
    hash_create_mem (0, sizeof (gre_tunnel_key4_t), sizeof (uword));
  gm->tunnel_by_key6 =
    hash_create_mem (0, sizeof (gre_tunnel_key6_t), sizeof (uword));
  gm->seq_num_by_key =
    hash_create_mem (0, sizeof (gre_sn_key_t), sizeof (uword));

#define _(n,s) add_protocol (gm, GRE_PROTOCOL_##s, #s);
  foreach_gre_protocol
#undef _
    return vlib_call_init_function (vm, gre_input_init);
}

VLIB_INIT_FUNCTION (gre_init);

#endif /* CLIB_MARCH_VARIANT */

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