aboutsummaryrefslogtreecommitdiffstats
path: root/tox.ini
AgeCommit message (Expand)AuthorFilesLines
2019-11-29Python3: PIP requirementPeter Mikus1-2/+2
2019-08-16TOX: Make tc_naming voting.Peter Mikus1-2/+1
2019-08-15TOX: DOC verifyPeter Mikus1-1/+8
2019-08-14DO_NOT_MERGE CSIT-1194 - Framework easy pylint improvementsMiroslav Los1-0/+1
2019-07-31TOX: Coverage checkPeter Mikus1-1/+6
2019-07-19TOX: Naming conventionsPeter Mikus1-1/+6
2019-07-02Replace license checker with global noticesVratko Polak1-5/+1
2019-06-28Add copyright checker to toxVratko Polak1-5/+7
2019-04-08Upgrade autogen to NICs and search typesVratko Polak1-0/+2
2019-03-21Update and reorder tox.ini TODOsVratko Polak1-3/+3
2019-03-20Add tox checker for lengths of new lines onlyVratko Polak1-11/+14
2019-02-27Add tox.ini and few checker scriptsVratko Polak1-0/+70
' href='#n420'>420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 
/*
 * 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.
 */
/*
 * ethernet_interface.c: ethernet interfaces
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/pg/pg.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ethernet/arp.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/l2_bd.h>
#include <vnet/adj/adj.h>

/**
 * @file
 * @brief Loopback Interfaces.
 *
 * This file contains code to manage loopback interfaces.
 */

const u8 *
ethernet_ip4_mcast_dst_addr (void)
{
  const static u8 ethernet_mcast_dst_mac[] = {
    0x1, 0x0, 0x5e, 0x0, 0x0, 0x0,
  };

  return (ethernet_mcast_dst_mac);
}

const u8 *
ethernet_ip6_mcast_dst_addr (void)
{
  const static u8 ethernet_mcast_dst_mac[] = {
    0x33, 0x33, 0x00, 0x0, 0x0, 0x0,
  };

  return (ethernet_mcast_dst_mac);
}

/**
 * @brief build a rewrite string to use for sending packets of type 'link_type'
 * to 'dst_address'
 */
u8 *
ethernet_build_rewrite (vnet_main_t * vnm,
			u32 sw_if_index,
			vnet_link_t link_type, const void *dst_address)
{
  vnet_sw_interface_t *sub_sw = vnet_get_sw_interface (vnm, sw_if_index);
  vnet_sw_interface_t *sup_sw = vnet_get_sup_sw_interface (vnm, sw_if_index);
  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
  ethernet_main_t *em = &ethernet_main;
  ethernet_interface_t *ei;
  ethernet_header_t *h;
  ethernet_type_t type;
  uword n_bytes = sizeof (h[0]);
  u8 *rewrite = NULL;
  u8 is_p2p = 0;

  if ((sub_sw->type == VNET_SW_INTERFACE_TYPE_P2P) ||
      (sub_sw->type == VNET_SW_INTERFACE_TYPE_PIPE))
    is_p2p = 1;
  if (sub_sw != sup_sw)
    {
      if (sub_sw->sub.eth.flags.one_tag)
	{
	  n_bytes += sizeof (ethernet_vlan_header_t);
	}
      else if (sub_sw->sub.eth.flags.two_tags)
	{
	  n_bytes += 2 * (sizeof (ethernet_vlan_header_t));
	}
      else if (PREDICT_FALSE (is_p2p))
	{
	  n_bytes = sizeof (ethernet_header_t);
	}
      if (PREDICT_FALSE (!is_p2p))
	{
	  // Check for encaps that are not supported for L3 interfaces
	  if (!(sub_sw->sub.eth.flags.exact_match) ||
	      (sub_sw->sub.eth.flags.default_sub) ||
	      (sub_sw->sub.eth.flags.outer_vlan_id_any) ||
	      (sub_sw->sub.eth.flags.inner_vlan_id_any))
	    {
	      return 0;
	    }
	}
      else
	{
	  n_bytes = sizeof (ethernet_header_t);
	}
    }

  switch (link_type)
    {
#define _(a,b) case VNET_LINK_##a: type = ETHERNET_TYPE_##b; break
      _(IP4, IP4);
      _(IP6, IP6);
      _(MPLS, MPLS);
      _(ARP, ARP);
#undef _
    default:
      return NULL;
    }

  vec_validate (rewrite, n_bytes - 1);
  h = (ethernet_header_t *) rewrite;
  ei = pool_elt_at_index (em->interfaces, hw->hw_instance);
  clib_memcpy (h->src_address, ei->address, sizeof (h->src_address));
  if (is_p2p)
    {
      clib_memcpy (h->dst_address, sub_sw->p2p.client_mac,
		   sizeof (h->dst_address));
    }
  else
    {
      if (dst_address)
	clib_memcpy (h->dst_address, dst_address, sizeof (h->dst_address));
      else
	clib_memset (h->dst_address, ~0, sizeof (h->dst_address));	/* broadcast */
    }

  if (PREDICT_FALSE (!is_p2p) && sub_sw->sub.eth.flags.one_tag)
    {
      ethernet_vlan_header_t *outer = (void *) (h + 1);

      h->type = sub_sw->sub.eth.flags.dot1ad ?
	clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
	clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
      outer->priority_cfi_and_id =
	clib_host_to_net_u16 (sub_sw->sub.eth.outer_vlan_id);
      outer->type = clib_host_to_net_u16 (type);

    }
  else if (PREDICT_FALSE (!is_p2p) && sub_sw->sub.eth.flags.two_tags)
    {
      ethernet_vlan_header_t *outer = (void *) (h + 1);
      ethernet_vlan_header_t *inner = (void *) (outer + 1);

      h->type = sub_sw->sub.eth.flags.dot1ad ?
	clib_host_to_net_u16 (ETHERNET_TYPE_DOT1AD) :
	clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
      outer->priority_cfi_and_id =
	clib_host_to_net_u16 (sub_sw->sub.eth.outer_vlan_id);
      outer->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN);
      inner->priority_cfi_and_id =
	clib_host_to_net_u16 (sub_sw->sub.eth.inner_vlan_id);
      inner->type = clib_host_to_net_u16 (type);

    }
  else
    {
      h->type = clib_host_to_net_u16 (type);
    }

  return (rewrite);
}

void
ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai)
{
  ip_adjacency_t *adj;

  adj = adj_get (ai);

  vnet_sw_interface_t *si = vnet_get_sw_interface (vnm, sw_if_index);
  if ((si->type == VNET_SW_INTERFACE_TYPE_P2P) ||
      (si->type == VNET_SW_INTERFACE_TYPE_PIPE))
    {
      default_update_adjacency (vnm, sw_if_index, ai);
    }
  else if (FIB_PROTOCOL_IP4 == adj->ia_nh_proto)
    {
      arp_update_adjacency (vnm, sw_if_index, ai);
    }
  else if (FIB_PROTOCOL_IP6 == adj->ia_nh_proto)
    {
      ip6_ethernet_update_adjacency (vnm, sw_if_index, ai);
    }
  else
    {
      ASSERT (0);
    }
}

static clib_error_t *
ethernet_mac_change (vnet_hw_interface_t * hi,
		     const u8 * old_address, const u8 * mac_address)
{
  ethernet_interface_t *ei;
  ethernet_main_t *em;

  em = &ethernet_main;
  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);

  vec_validate (hi->hw_address,
		STRUCT_SIZE_OF (ethernet_header_t, src_address) - 1);
  clib_memcpy (hi->hw_address, mac_address, vec_len (hi->hw_address));

  clib_memcpy (ei->address, (u8 *) mac_address, sizeof (ei->address));
  ethernet_arp_change_mac (hi->sw_if_index);
  ethernet_ndp_change_mac (hi->sw_if_index);

  return (NULL);
}

/* *INDENT-OFF* */
VNET_HW_INTERFACE_CLASS (ethernet_hw_interface_class) = {
  .name = "Ethernet",
  .format_address = format_ethernet_address,
  .format_header = format_ethernet_header_with_length,
  .unformat_hw_address = unformat_ethernet_address,
  .unformat_header = unformat_ethernet_header,
  .build_rewrite = ethernet_build_rewrite,
  .update_adjacency = ethernet_update_adjacency,
  .mac_addr_change_function = ethernet_mac_change,
};
/* *INDENT-ON* */

uword
unformat_ethernet_interface (unformat_input_t * input, va_list * args)
{
  vnet_main_t *vnm = va_arg (*args, vnet_main_t *);
  u32 *result = va_arg (*args, u32 *);
  u32 hw_if_index;
  ethernet_main_t *em = &ethernet_main;
  ethernet_interface_t *eif;

  if (!unformat_user (input, unformat_vnet_hw_interface, vnm, &hw_if_index))
    return 0;

  eif = ethernet_get_interface (em, hw_if_index);
  if (eif)
    {
      *result = hw_if_index;
      return 1;
    }
  return 0;
}

clib_error_t *
ethernet_register_interface (vnet_main_t * vnm,
			     u32 dev_class_index,
			     u32 dev_instance,
			     const u8 * address,
			     u32 * hw_if_index_return,
			     ethernet_flag_change_function_t flag_change)
{
  ethernet_main_t *em = &ethernet_main;
  ethernet_interface_t *ei;
  vnet_hw_interface_t *hi;
  clib_error_t *error = 0;
  u32 hw_if_index;

  pool_get (em->interfaces, ei);
  ei->flag_change = flag_change;

  hw_if_index = vnet_register_interface
    (vnm,
     dev_class_index, dev_instance,
     ethernet_hw_interface_class.index, ei - em->interfaces);
  *hw_if_index_return = hw_if_index;

  hi = vnet_get_hw_interface (vnm, hw_if_index);

  ethernet_setup_node (vnm->vlib_main, hi->output_node_index);

  hi->min_packet_bytes = hi->min_supported_packet_bytes =
    ETHERNET_MIN_PACKET_BYTES;
  hi->max_packet_bytes = hi->max_supported_packet_bytes =
    ETHERNET_MAX_PACKET_BYTES;

  /* Standard default ethernet MTU. */
  vnet_sw_interface_set_mtu (vnm, hi->sw_if_index, 9000);

  clib_memcpy (ei->address, address, sizeof (ei->address));
  vec_add (hi->hw_address, address, sizeof (ei->address));

  if (error)
    {
      pool_put (em->interfaces, ei);
      return error;
    }
  return error;
}

void
ethernet_delete_interface (vnet_main_t * vnm, u32 hw_if_index)
{
  ethernet_main_t *em = &ethernet_main;
  ethernet_interface_t *ei;
  vnet_hw_interface_t *hi;
  main_intf_t *main_intf;
  vlan_table_t *vlan_table;
  u32 idx;

  hi = vnet_get_hw_interface (vnm, hw_if_index);
  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);

  /* Delete vlan mapping table for dot1q and dot1ad. */
  main_intf = vec_elt_at_index (em->main_intfs, hi->hw_if_index);
  if (main_intf->dot1q_vlans)
    {
      vlan_table = vec_elt_at_index (em->vlan_pool, main_intf->dot1q_vlans);
      for (idx = 0; idx < ETHERNET_N_VLAN; idx++)
	{
	  if (vlan_table->vlans[idx].qinqs)
	    {
	      pool_put_index (em->qinq_pool, vlan_table->vlans[idx].qinqs);
	      vlan_table->vlans[idx].qinqs = 0;
	    }
	}
      pool_put_index (em->vlan_pool, main_intf->dot1q_vlans);
      main_intf->dot1q_vlans = 0;
    }
  if (main_intf->dot1ad_vlans)
    {
      vlan_table = vec_elt_at_index (em->vlan_pool, main_intf->dot1ad_vlans);
      for (idx = 0; idx < ETHERNET_N_VLAN; idx++)
	{
	  if (vlan_table->vlans[idx].qinqs)
	    {
	      pool_put_index (em->qinq_pool, vlan_table->vlans[idx].qinqs);
	      vlan_table->vlans[idx].qinqs = 0;
	    }
	}
      pool_put_index (em->vlan_pool, main_intf->dot1ad_vlans);
      main_intf->dot1ad_vlans = 0;
    }

  vnet_delete_hw_interface (vnm, hw_if_index);
  pool_put (em->interfaces, ei);
}

u32
ethernet_set_flags (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
  ethernet_main_t *em = &ethernet_main;
  vnet_hw_interface_t *hi;
  ethernet_interface_t *ei;

  hi = vnet_get_hw_interface (vnm, hw_if_index);

  ASSERT (hi->hw_class_index == ethernet_hw_interface_class.index);

  ei = pool_elt_at_index (em->interfaces, hi->hw_instance);
  ei->flags = flags;
  if (ei->flag_change)
    return ei->flag_change (vnm, hi, flags);
  return (u32) ~ 0;
}

/**
 * Echo packets back to ethernet/l2-input.
 */
static uword
simulated_ethernet_interface_tx (vlib_main_t * vm,
				 vlib_node_runtime_t *
				 node, vlib_frame_t * frame)
{
  u32 n_left_from, *from;
  u32 next_index = 0;
  u32 n_bytes;
  u32 thread_index = vm->thread_index;
  vnet_main_t *vnm = vnet_get_main ();
  vnet_interface_main_t *im = &vnm->interface_main;
  l2_input_config_t *config;
  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
  u16 nexts[VLIB_FRAME_SIZE], *next;
  u32 new_rx_sw_if_index = ~0;
  u32 new_tx_sw_if_index = ~0;

  n_left_from = frame->n_vectors;
  from = vlib_frame_vector_args (frame);

  vlib_get_buffers (vm, from, bufs, n_left_from);
  b = bufs;
  next = nexts;

  /* Ordinarily, this is the only config lookup. */
  config = l2input_intf_config (vnet_buffer (b[0])->sw_if_index[VLIB_TX]);
  next_index =
    config->bridge ? VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT :
    VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT;
  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];

  while (n_left_from >= 4)
    {
      u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
      u32 not_all_match_config;

      /* Prefetch next iteration. */
      if (PREDICT_TRUE (n_left_from >= 8))
	{
	  vlib_prefetch_buffer_header (b[4], STORE);
	  vlib_prefetch_buffer_header (b[5], STORE);
	  vlib_prefetch_buffer_header (b[6], STORE);
	  vlib_prefetch_buffer_header (b[7], STORE);
	}

      /* Make sure all pkts were transmitted on the same (loop) intfc */
      sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
      sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
      sw_if_index2 = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
      sw_if_index3 = vnet_buffer (b[3])->sw_if_index[VLIB_TX];

      not_all_match_config = (sw_if_index0 ^ sw_if_index1)
	^ (sw_if_index2 ^ sw_if_index3);
      not_all_match_config += sw_if_index0 ^ new_rx_sw_if_index;

      /* Speed path / expected case: all pkts on the same intfc */
      if (PREDICT_TRUE (not_all_match_config == 0))
	{
	  next[0] = next_index;
	  next[1] = next_index;
	  next[2] = next_index;
	  next[3] = next_index;
	  vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
	  vnet_buffer (b[1])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
	  vnet_buffer (b[2])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
	  vnet_buffer (b[3])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
	  vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
	  vnet_buffer (b[1])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
	  vnet_buffer (b[2])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
	  vnet_buffer (b[3])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
	  n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
	  n_bytes += vlib_buffer_length_in_chain (vm, b[1]);
	  n_bytes += vlib_buffer_length_in_chain (vm, b[2]);
	  n_bytes += vlib_buffer_length_in_chain (vm, b[3]);

	  if (next_index == VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT)
	    {
	      vnet_update_l2_len (b[0]);
	      vnet_update_l2_len (b[1]);
	      vnet_update_l2_len (b[2]);
	      vnet_update_l2_len (b[3]);
	    }

	  /* increment TX interface stat */
	  vlib_increment_combined_counter (im->combined_sw_if_counters +
					   VNET_INTERFACE_COUNTER_TX,
					   thread_index, new_rx_sw_if_index,
					   4 /* pkts */ , n_bytes);
	  b += 4;
	  next += 4;
	  n_left_from -= 4;
	  continue;
	}

      /*
       * Slow path: we know that at least one of the pkts
       * was transmitted on a different sw_if_index, so
       * check each sw_if_index against the cached data and proceed
       * accordingly.
       *
       * This shouldn't happen, but code can (and does) bypass the
       * per-interface output node, so deal with it.
       */
      if (PREDICT_FALSE (vnet_buffer (b[0])->sw_if_index[VLIB_TX]
			 != new_rx_sw_if_index))
	{
	  config = l2input_intf_config
	    (vnet_buffer (b[0])->sw_if_index[VLIB_TX]);
	  next_index =
	    config->bridge ? VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT :
	    VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT;
	  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
	  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
	}
      next[0] = next_index;
      vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
      vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
      n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
      if (next_index == VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT)
	vnet_update_l2_len (b[0]);

      vlib_increment_combined_counter (im->combined_sw_if_counters +
				       VNET_INTERFACE_COUNTER_TX,
				       thread_index, new_rx_sw_if_index,
				       1 /* pkts */ , n_bytes);

      if (PREDICT_FALSE (vnet_buffer (b[1])->sw_if_index[VLIB_TX]
			 != new_rx_sw_if_index))
	{
	  config = l2input_intf_config
	    (vnet_buffer (b[1])->sw_if_index[VLIB_TX]);
	  next_index =
	    config->bridge ? VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT :
	    VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT;
	  new_rx_sw_if_index = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
	  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
	}
      next[1] = next_index;
      vnet_buffer (b[1])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
      vnet_buffer (b[1])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
      n_bytes = vlib_buffer_length_in_chain (vm, b[1]);
      if (next_index == VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT)
	vnet_update_l2_len (b[1]);

      vlib_increment_combined_counter (im->combined_sw_if_counters +
				       VNET_INTERFACE_COUNTER_TX,
				       thread_index, new_rx_sw_if_index,
				       1 /* pkts */ , n_bytes);

      if (PREDICT_FALSE (vnet_buffer (b[2])->sw_if_index[VLIB_TX]
			 != new_rx_sw_if_index))
	{
	  config = l2input_intf_config
	    (vnet_buffer (b[2])->sw_if_index[VLIB_TX]);
	  next_index =
	    config->bridge ? VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT :
	    VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT;
	  new_rx_sw_if_index = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
	  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
	}
      next[2] = next_index;
      vnet_buffer (b[2])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
      vnet_buffer (b[2])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
      n_bytes = vlib_buffer_length_in_chain (vm, b[2]);
      if (next_index == VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT)
	vnet_update_l2_len (b[2]);

      vlib_increment_combined_counter (im->combined_sw_if_counters +
				       VNET_INTERFACE_COUNTER_TX,
				       thread_index, new_rx_sw_if_index,
				       1 /* pkts */ , n_bytes);

      if (PREDICT_FALSE (vnet_buffer (b[3])->sw_if_index[VLIB_TX]
			 != new_rx_sw_if_index))
	{
	  config = l2input_intf_config
	    (vnet_buffer (b[3])->sw_if_index[VLIB_TX]);
	  next_index =
	    config->bridge ? VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT :
	    VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT;
	  new_rx_sw_if_index = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
	  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
	}
      next[3] = next_index;
      vnet_buffer (b[3])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
      vnet_buffer (b[3])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
      n_bytes = vlib_buffer_length_in_chain (vm, b[3]);
      if (next_index == VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT)
	vnet_update_l2_len (b[3]);

      vlib_increment_combined_counter (im->combined_sw_if_counters +
				       VNET_INTERFACE_COUNTER_TX,
				       thread_index, new_rx_sw_if_index,
				       1 /* pkts */ , n_bytes);
      b += 4;
      next += 4;
      n_left_from -= 4;
    }
  while (n_left_from > 0)
    {
      if (PREDICT_FALSE (vnet_buffer (b[0])->sw_if_index[VLIB_TX]
			 != new_rx_sw_if_index))
	{
	  config = l2input_intf_config
	    (vnet_buffer (b[0])->sw_if_index[VLIB_TX]);
	  next_index =
	    config->bridge ? VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT :
	    VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT;
	  new_tx_sw_if_index = config->bvi ? L2INPUT_BVI : ~0;
	  new_rx_sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
	}
      next[0] = next_index;
      vnet_buffer (b[0])->sw_if_index[VLIB_RX] = new_rx_sw_if_index;
      vnet_buffer (b[0])->sw_if_index[VLIB_TX] = new_tx_sw_if_index;
      n_bytes = vlib_buffer_length_in_chain (vm, b[0]);
      if (next_index == VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT)
	vnet_update_l2_len (b[0]);

      vlib_increment_combined_counter (im->combined_sw_if_counters +
				       VNET_INTERFACE_COUNTER_TX,
				       thread_index, new_rx_sw_if_index,
				       1 /* pkts */ , n_bytes);
      b += 1;
      next += 1;
      n_left_from -= 1;
    }

  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);

  return frame->n_vectors;
}

static u8 *
format_simulated_ethernet_name (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  return format (s, "loop%d", dev_instance);
}

static clib_error_t *
simulated_ethernet_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
				  u32 flags)
{
  u32 hw_flags = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) ?
    VNET_HW_INTERFACE_FLAG_LINK_UP : 0;
  vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
  return 0;
}

static clib_error_t *
simulated_ethernet_mac_change (vnet_hw_interface_t * hi,
			       const u8 * old_address, const u8 * mac_address)
{
  l2input_interface_mac_change (hi->sw_if_index, old_address, mac_address);

  return (NULL);
}


/* *INDENT-OFF* */
VNET_DEVICE_CLASS (ethernet_simulated_device_class) = {
  .name = "Loopback",
  .format_device_name = format_simulated_ethernet_name,
  .tx_function = simulated_ethernet_interface_tx,
  .admin_up_down_function = simulated_ethernet_admin_up_down,
  .mac_addr_change_function = simulated_ethernet_mac_change,
};
/* *INDENT-ON* */

/*
 * Maintain a bitmap of allocated loopback instance numbers.
 */
#define LOOPBACK_MAX_INSTANCE		(16 * 1024)

static u32
loopback_instance_alloc (u8 is_specified, u32 want)
{
  ethernet_main_t *em = &ethernet_main;

  /*
   * Check for dynamically allocaetd instance number.
   */
  if (!is_specified)
    {
      u32 bit;

      bit = clib_bitmap_first_clear (em->bm_loopback_instances);
      if (bit >= LOOPBACK_MAX_INSTANCE)
	{
	  return ~0;
	}
      em->bm_loopback_instances = clib_bitmap_set (em->bm_loopback_instances,
						   bit, 1);
      return bit;
    }

  /*
   * In range?
   */
  if (want >= LOOPBACK_MAX_INSTANCE)
    {
      return ~0;
    }

  /*
   * Already in use?
   */
  if (clib_bitmap_get (em->bm_loopback_instances, want))
    {
      return ~0;
    }

  /*
   * Grant allocation request.
   */
  em->bm_loopback_instances = clib_bitmap_set (em->bm_loopback_instances,
					       want, 1);

  return want;
}

static int
loopback_instance_free (u32 instance)
{
  ethernet_main_t *em = &ethernet_main;

  if (instance >= LOOPBACK_MAX_INSTANCE)
    {
      return -1;
    }

  if (clib_bitmap_get (em->bm_loopback_instances, instance) == 0)
    {
      return -1;
    }

  em->bm_loopback_instances = clib_bitmap_set (em->bm_loopback_instances,
					       instance, 0);
  return 0;
}

int
vnet_create_loopback_interface (u32 * sw_if_indexp, u8 * mac_address,
				u8 is_specified, u32 user_instance)
{
  vnet_main_t *vnm = vnet_get_main ();
  vlib_main_t *vm = vlib_get_main ();
  clib_error_t *error;
  u32 instance;
  u8 address[6];
  u32 hw_if_index;
  vnet_hw_interface_t *hw_if;
  u32 slot;
  int rv = 0;

  ASSERT (sw_if_indexp);

  *sw_if_indexp = (u32) ~ 0;

  clib_memset (address, 0, sizeof (address));

  /*
   * Allocate a loopback instance.  Either select on dynamically
   * or try to use the desired user_instance number.
   */
  instance = loopback_instance_alloc (is_specified, user_instance);
  if (instance == ~0)
    {
      return VNET_API_ERROR_INVALID_REGISTRATION;
    }

  /*
   * Default MAC address (dead:0000:0000 + instance) is allocated
   * if zero mac_address is configured. Otherwise, user-configurable MAC
   * address is programmed on the loopback interface.
   */
  if (memcmp (address, mac_address, sizeof (address)))
    clib_memcpy (address, mac_address, sizeof (address));
  else
    {
      address[0] = 0xde;
      address[1] = 0xad;
      address[5] = instance;
    }

  error = ethernet_register_interface
    (vnm,
     ethernet_simulated_device_class.index, instance, address, &hw_if_index,
     /* flag change */ 0);

  if (error)
    {
      rv = VNET_API_ERROR_INVALID_REGISTRATION;
      clib_error_report (error);
      return rv;
    }

  hw_if = vnet_get_hw_interface (vnm, hw_if_index);
  slot = vlib_node_add_named_next_with_slot
    (vm, hw_if->tx_node_index,
     "ethernet-input", VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);
  ASSERT (slot == VNET_SIMULATED_ETHERNET_TX_NEXT_ETHERNET_INPUT);

  slot = vlib_node_add_named_next_with_slot
    (vm, hw_if->tx_node_index,
     "l2-input", VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT);
  ASSERT (slot == VNET_SIMULATED_ETHERNET_TX_NEXT_L2_INPUT);

  {
    vnet_sw_interface_t *si = vnet_get_hw_sw_interface (vnm, hw_if_index);
    *sw_if_indexp = si->sw_if_index;

    /* By default don't flood to loopbacks, as packets just keep
     * coming back ... If this loopback becomes a BVI, we'll change it */
    si->flood_class = VNET_FLOOD_CLASS_NO_FLOOD;
  }

  return 0;
}

static clib_error_t *
create_simulated_ethernet_interfaces (vlib_main_t * vm,
				      unformat_input_t * input,
				      vlib_cli_command_t * cmd)
{
  int rv;
  u32 sw_if_index;
  u8 mac_address[6];
  u8 is_specified = 0;
  u32 user_instance = 0;

  clib_memset (mac_address, 0, sizeof (mac_address));

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "mac %U", unformat_ethernet_address, mac_address))
	;
      if (unformat (input, "instance %d", &user_instance))
	is_specified = 1;
      else
	break;
    }

  rv = vnet_create_loopback_interface (&sw_if_index, mac_address,
				       is_specified, user_instance);

  if (rv)
    return clib_error_return (0, "vnet_create_loopback_interface failed");

  vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main (),
		   sw_if_index);
  return 0;
}

/*?
 * Create a loopback interface. Optionally, a MAC Address can be
 * provided. If not provided, de:ad:00:00:00:<loopId> will be used.
 *
 * @cliexpar
 * The following two command syntaxes are equivalent:
 * @cliexcmd{loopback create-interface [mac <mac-addr>] [instance <instance>]}
 * @cliexcmd{create loopback interface [mac <mac-addr>] [instance <instance>]}
 * Example of how to create a loopback interface:
 * @cliexcmd{loopback create-interface}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (create_simulated_ethernet_interface_command, static) = {
  .path = "loopback create-interface",
  .short_help = "loopback create-interface [mac <mac-addr>] [instance <instance>]",
  .function = create_simulated_ethernet_interfaces,
};
/* *INDENT-ON* */

/*?
 * Create a loopback interface. Optionally, a MAC Address can be
 * provided. If not provided, de:ad:00:00:00:<loopId> will be used.
 *
 * @cliexpar
 * The following two command syntaxes are equivalent:
 * @cliexcmd{loopback create-interface [mac <mac-addr>] [instance <instance>]}
 * @cliexcmd{create loopback interface [mac <mac-addr>] [instance <instance>]}
 * Example of how to create a loopback interface:
 * @cliexcmd{create loopback interface}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (create_loopback_interface_command, static) = {
  .path = "create loopback interface",
  .short_help = "create loopback interface [mac <mac-addr>] [instance <instance>]",
  .function = create_simulated_ethernet_interfaces,
};
/* *INDENT-ON* */

ethernet_interface_t *
ethernet_get_interface (ethernet_main_t * em, u32 hw_if_index)
{
  vnet_hw_interface_t *i =
    vnet_get_hw_interface (vnet_get_main (), hw_if_index);
  return (i->hw_class_index ==
	  ethernet_hw_interface_class.
	  index ? pool_elt_at_index (em->interfaces, i->hw_instance) : 0);
}

int
vnet_delete_loopback_interface (u32 sw_if_index)
{
  vnet_main_t *vnm = vnet_get_main ();

  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
    return VNET_API_ERROR_INVALID_SW_IF_INDEX;

  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
  if (hw == 0 || hw->dev_class_index != ethernet_simulated_device_class.index)
    return VNET_API_ERROR_INVALID_SW_IF_INDEX;

  if (loopback_instance_free (hw->dev_instance) < 0)
    return VNET_API_ERROR_INVALID_SW_IF_INDEX;

  ethernet_delete_interface (vnm, hw->hw_if_index);

  return 0;
}

int
vnet_delete_sub_interface (u32 sw_if_index)
{
  vnet_main_t *vnm = vnet_get_main ();
  vnet_sw_interface_t *si;
  int rv = 0;

  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
    return VNET_API_ERROR_INVALID_SW_IF_INDEX;

  si = vnet_get_sw_interface (vnm, sw_if_index);
  if (si->type == VNET_SW_INTERFACE_TYPE_SUB ||
      si->type == VNET_SW_INTERFACE_TYPE_PIPE ||
      si->type == VNET_SW_INTERFACE_TYPE_P2P)
    {
      vnet_interface_main_t *im = &vnm->interface_main;
      vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
      u64 sup_and_sub_key =
	((u64) (si->sup_sw_if_index) << 32) | (u64) si->sub.id;
      hash_unset_mem_free (&im->sw_if_index_by_sup_and_sub, &sup_and_sub_key);
      hash_unset (hi->sub_interface_sw_if_index_by_id, si->sub.id);
      vnet_delete_sw_interface (vnm, sw_if_index);
    }
  else
    rv = VNET_API_ERROR_INVALID_SUB_SW_IF_INDEX;

  return rv;
}

static clib_error_t *
delete_simulated_ethernet_interfaces (vlib_main_t * vm,
				      unformat_input_t * input,
				      vlib_cli_command_t * cmd)
{
  int rv;
  u32 sw_if_index = ~0;
  vnet_main_t *vnm = vnet_get_main ();

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "intfc %U",
		    unformat_vnet_sw_interface, vnm, &sw_if_index))
	;
      else
	break;
    }

  if (sw_if_index == ~0)
    return clib_error_return (0, "interface not specified");

  rv = vnet_delete_loopback_interface (sw_if_index);

  if (rv)
    return clib_error_return (0, "vnet_delete_loopback_interface failed");

  return 0;
}

static clib_error_t *
delete_sub_interface (vlib_main_t * vm,
		      unformat_input_t * input, vlib_cli_command_t * cmd)
{
  int rv = 0;
  u32 sw_if_index = ~0;
  vnet_main_t *vnm = vnet_get_main ();

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat
	  (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
	;
      else
	break;
    }
  if (sw_if_index == ~0)
    return clib_error_return (0, "interface doesn't exist");

  if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
    rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;
  else
    rv = vnet_delete_sub_interface (sw_if_index);
  if (rv)
    return clib_error_return (0, "delete_subinterface_interface failed");
  return 0;
}

/*?
 * Delete a loopback interface.
 *
 * @cliexpar
 * The following two command syntaxes are equivalent:
 * @cliexcmd{loopback delete-interface intfc <interface>}
 * @cliexcmd{delete loopback interface intfc <interface>}
 * Example of how to delete a loopback interface:
 * @cliexcmd{loopback delete-interface intfc loop0}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (delete_simulated_ethernet_interface_command, static) = {
  .path = "loopback delete-interface",
  .short_help = "loopback delete-interface intfc <interface>",
  .function = delete_simulated_ethernet_interfaces,
};
/* *INDENT-ON* */

/*?
 * Delete a loopback interface.
 *
 * @cliexpar
 * The following two command syntaxes are equivalent:
 * @cliexcmd{loopback delete-interface intfc <interface>}
 * @cliexcmd{delete loopback interface intfc <interface>}
 * Example of how to delete a loopback interface:
 * @cliexcmd{delete loopback interface intfc loop0}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (delete_loopback_interface_command, static) = {
  .path = "delete loopback interface",
  .short_help = "delete loopback interface intfc <interface>",
  .function = delete_simulated_ethernet_interfaces,
};
/* *INDENT-ON* */

/*?
 * Delete a sub-interface.
 *
 * @cliexpar
 * Example of how to delete a sub-interface:
 * @cliexcmd{delete sub-interface GigabitEthernet0/8/0.200}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (delete_sub_interface_command, static) = {
  .path = "delete sub-interface",
  .short_help = "delete sub-interface <interface>",
  .function = delete_sub_interface,
};
/* *INDENT-ON* */

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