aboutsummaryrefslogtreecommitdiffstats
path: root/src/vlib/error_funcs.h
blob: ab281ba2ef8093f0c87990df7fec1efe97228010 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
/*
 * 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.
 */
/*
 * error_funcs.h: VLIB error handling
 *
 * 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.
 */

#ifndef included_vlib_error_funcs_h
#define included_vlib_error_funcs_h

#include <vlib/node_funcs.h>

always_inline void
vlib_error_elog_count (vlib_main_t * vm, uword counter, uword increment)
{
  if (VLIB_ELOG_MAIN_LOOP > 0 && increment > 0)
    {
      elog_main_t *em = &vm->elog_main;
      elog (em, vec_elt_at_index (vm->error_elog_event_types, counter),
	    increment);
    }
}

always_inline void
vlib_error_count (vlib_main_t * vm, uword node_index,
		  uword counter, uword increment)
{
  vlib_node_t *n = vlib_get_node (vm, node_index);
  vlib_error_main_t *em = &vm->error_main;

  ASSERT (counter < n->n_errors);
  counter += n->error_heap_index;

  ASSERT (counter < vec_len (em->counters));
  em->counters[counter] += increment;

  vlib_error_elog_count (vm, counter, increment);
}

/* Drop all buffers in frame with given error code. */
uword
vlib_error_drop_buffers (vlib_main_t * vm,
			 vlib_node_runtime_t * node,
			 u32 * buffers,
			 u32 next_buffer_stride,
			 u32 n_buffers,
			 u32 error_next_index,
			 u32 error_node, u32 error_code);

#endif /* included_vlib_error_funcs_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
>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 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
/*
 * proxy_node.c: dhcp proxy node processing
 *
 * Copyright (c) 2013 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 <vlib/vlib.h>
#include <vnet/pg/pg.h>
#include <vnet/dhcp/dhcp_proxy.h>
#include <vnet/dhcp/client.h>
#include <vnet/fib/ip4_fib.h>

static char *dhcp_proxy_error_strings[] = {
#define dhcp_proxy_error(n,s) s,
#include <vnet/dhcp/dhcp4_proxy_error.def>
#undef dhcp_proxy_error
};

#define foreach_dhcp_proxy_to_server_input_next \
  _ (DROP, "error-drop")			\
  _ (LOOKUP, "ip4-lookup")			\
  _ (SEND_TO_CLIENT, "dhcp-proxy-to-client")

typedef enum
{
#define _(s,n) DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s,
  foreach_dhcp_proxy_to_server_input_next
#undef _
    DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
} dhcp_proxy_to_server_input_next_t;

typedef struct
{
  /* 0 => to server, 1 => to client */
  int which;
  ip4_address_t trace_ip4_address;
  u32 error;
  u32 sw_if_index;
  u32 original_sw_if_index;
} dhcp_proxy_trace_t;

#define VPP_DHCP_OPTION82_SUB1_SIZE   6
#define VPP_DHCP_OPTION82_SUB5_SIZE   6
#define VPP_DHCP_OPTION82_VSS_SIZE    12
#define VPP_DHCP_OPTION82_SIZE (VPP_DHCP_OPTION82_SUB1_SIZE + \
                                VPP_DHCP_OPTION82_SUB5_SIZE + \
                                VPP_DHCP_OPTION82_VSS_SIZE +3)

static vlib_node_registration_t dhcp_proxy_to_server_node;
static vlib_node_registration_t dhcp_proxy_to_client_node;

static u8 *
format_dhcp_proxy_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 *);
  dhcp_proxy_trace_t *t = va_arg (*args, dhcp_proxy_trace_t *);

  if (t->which == 0)
    s = format (s, "DHCP proxy: sent to server %U\n",
		format_ip4_address, &t->trace_ip4_address, t->error);
  else
    s = format (s, "DHCP proxy: broadcast to client from %U\n",
		format_ip4_address, &t->trace_ip4_address);

  if (t->error != (u32) ~ 0)
    s = format (s, "  error: %s\n", dhcp_proxy_error_strings[t->error]);

  s = format (s, "  original_sw_if_index: %d, sw_if_index: %d\n",
	      t->original_sw_if_index, t->sw_if_index);

  return s;
}

static u8 *
format_dhcp_proxy_header_with_length (u8 * s, va_list * args)
{
  dhcp_header_t *h = va_arg (*args, dhcp_header_t *);
  u32 max_header_bytes = va_arg (*args, u32);
  u32 header_bytes;

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

  s = format (s, "DHCP Proxy");

  return s;
}

static uword
dhcp_proxy_to_server_input (vlib_main_t * vm,
			    vlib_node_runtime_t * node,
			    vlib_frame_t * from_frame)
{
  u32 n_left_from, next_index, *from, *to_next;
  dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
  from = vlib_frame_vector_args (from_frame);
  n_left_from = from_frame->n_vectors;
  u32 pkts_to_server = 0, pkts_to_client = 0, pkts_no_server = 0;
  u32 pkts_no_interface_address = 0;
  u32 pkts_too_big = 0;
  ip4_main_t *im = &ip4_main;

  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)
	{
	  u32 bi0;
	  vlib_buffer_t *b0;
	  udp_header_t *u0;
	  dhcp_header_t *h0;
	  ip4_header_t *ip0;
	  u32 next0;
	  u32 old0, new0;
	  ip_csum_t sum0;
	  u32 error0 = (u32) ~ 0;
	  u32 sw_if_index = 0;
	  u32 original_sw_if_index = 0;
	  u32 fib_index;
	  dhcp_proxy_t *proxy;
	  dhcp_server_t *server;
	  u32 rx_sw_if_index;
	  dhcp_option_t *o, *end;
	  u32 len = 0;
	  u8 is_discover = 0;
	  int space_left;

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

	  b0 = vlib_get_buffer (vm, bi0);

	  h0 = vlib_buffer_get_current (b0);

	  /*
	   * udp_local hands us the DHCP header, need udp hdr,
	   * ip hdr to relay to server
	   */
	  vlib_buffer_advance (b0, -(sizeof (*u0)));
	  u0 = vlib_buffer_get_current (b0);

	  /* This blows. Return traffic has src_port = 67, dst_port = 67 */
	  if (u0->src_port ==
	      clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_server))
	    {
	      vlib_buffer_advance (b0, sizeof (*u0));
	      next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
	      error0 = 0;
	      pkts_to_client++;
	      goto do_enqueue;
	    }

	  rx_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	  fib_index = im->fib_index_by_sw_if_index[rx_sw_if_index];
	  proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);

	  if (PREDICT_FALSE (NULL == proxy))
	    {
	      error0 = DHCP_PROXY_ERROR_NO_SERVER;
	      next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
	      pkts_no_server++;
	      goto do_trace;
	    }

	  if (!vlib_buffer_chain_linearize (vm, b0))
	    {
	      error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
	      next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
	      pkts_too_big++;
	      goto do_trace;
	    }
	  space_left = vlib_buffer_space_left_at_end (vm, b0);
	  /* cant parse chains...
	   * and we need some space for option 82*/
	  if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 ||
	      space_left < VPP_DHCP_OPTION82_SIZE)
	    {
	      error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
	      next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
	      pkts_too_big++;
	      goto do_trace;
	    }

	  server = &proxy->dhcp_servers[0];
	  vlib_buffer_advance (b0, -(sizeof (*ip0)));
	  ip0 = vlib_buffer_get_current (b0);

	  /* disable UDP checksum */
	  u0->checksum = 0;
	  sum0 = ip0->checksum;
	  old0 = ip0->dst_address.as_u32;
	  new0 = server->dhcp_server.ip4.as_u32;
	  ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
	  sum0 = ip_csum_update (sum0, old0, new0,
				 ip4_header_t /* structure */ ,
				 dst_address /* changed member */ );
	  ip0->checksum = ip_csum_fold (sum0);

	  sum0 = ip0->checksum;
	  old0 = ip0->src_address.as_u32;
	  new0 = proxy->dhcp_src_address.ip4.as_u32;
	  ip0->src_address.as_u32 = new0;
	  sum0 = ip_csum_update (sum0, old0, new0,
				 ip4_header_t /* structure */ ,
				 src_address /* changed member */ );
	  ip0->checksum = ip_csum_fold (sum0);

	  /* Send to DHCP server via the configured FIB */
	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = server->server_fib_index;

	  h0->gateway_ip_address = proxy->dhcp_src_address.ip4;
	  pkts_to_server++;

	  o = h0->options;
	  end = (void *) vlib_buffer_get_tail (b0);

	  /* TLVs are not performance-friendly... */
	  while (o->option != DHCP_PACKET_OPTION_END && o < end)
	    {
	      if (DHCP_PACKET_OPTION_MSG_TYPE == o->option)
		{
		  if (DHCP_PACKET_DISCOVER == o->data[0])
		    {
		      is_discover = 1;
		    }
		}
	      o = (dhcp_option_t *) (o->data + o->length);
	    }

	  if (o->option == DHCP_PACKET_OPTION_END && o <= end)
	    {
	      vnet_main_t *vnm = vnet_get_main ();
	      u16 old_l0, new_l0;
	      ip4_address_t _ia0, *ia0 = &_ia0;
	      dhcp_vss_t *vss;
	      vnet_sw_interface_t *swif;

	      original_sw_if_index = sw_if_index =
		vnet_buffer (b0)->sw_if_index[VLIB_RX];
	      swif = vnet_get_sw_interface (vnm, sw_if_index);
	      if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
		sw_if_index = swif->unnumbered_sw_if_index;

	      /*
	       * Get the first ip4 address on the [client-side]
	       * RX interface, if not unnumbered. otherwise use
	       * the loopback interface's ip address.
	       */
	      ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);

	      if (ia0 == 0)
		{
		  error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
		  next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_DROP;
		  pkts_no_interface_address++;
		  goto do_trace;
		}

	      /* Add option 82 */
	      o->option = 82;	/* option 82 */
	      o->length = 12;	/* 12 octets to follow */
	      o->data[0] = 1;	/* suboption 1, circuit ID (=FIB id) */
	      o->data[1] = 4;	/* length of suboption */
	      u32 *o_ifid = (u32 *) & o->data[2];
	      *o_ifid = clib_host_to_net_u32 (original_sw_if_index);
	      o->data[6] = 5;	/* suboption 5 (client RX intfc address) */
	      o->data[7] = 4;	/* length 4 */
	      u32 *o_addr = (u32 *) & o->data[8];
	      *o_addr = ia0->as_u32;
	      o->data[12] = DHCP_PACKET_OPTION_END;

	      vss = dhcp_get_vss_info (dpm, fib_index, FIB_PROTOCOL_IP4);
	      if (vss)
		{
		  u32 id_len;	/* length of VPN ID */

		  if (vss->vss_type == VSS_TYPE_VPN_ID)
		    {
		      id_len = sizeof (vss->vpn_id);	/* vpn_id is 7 bytes */
		      memcpy (&o->data[15], vss->vpn_id, id_len);
		    }
		  else if (vss->vss_type == VSS_TYPE_ASCII)
		    {
		      id_len = vec_len (vss->vpn_ascii_id);
		      memcpy (&o->data[15], vss->vpn_ascii_id, id_len);
		    }
		  else		/* must be VSS_TYPE_DEFAULT, no VPN ID */
		    id_len = 0;

		  o->data[12] = 151;	/* vss suboption */
		  o->data[13] = id_len + 1;	/* length: vss_type + id_len */
		  o->data[14] = vss->vss_type;	/* vss option type */
		  o->data[15 + id_len] = 152;	/* vss control suboption */
		  o->data[16 + id_len] = 0;	/* length */
		  o->data[17 + id_len] = DHCP_PACKET_OPTION_END;	/* "end-of-options" (0xFF) */
		  /* 5 bytes for suboption headers 151+len, 152+len and 0xFF */
		  o->length += id_len + 5;
		}

	      len = o->length + 3;
	      b0->current_length += len;
	      /* Fix IP header length and checksum */
	      old_l0 = ip0->length;
	      new_l0 = clib_net_to_host_u16 (old_l0);
	      new_l0 += len;
	      new_l0 = clib_host_to_net_u16 (new_l0);
	      ip0->length = new_l0;
	      sum0 = ip0->checksum;
	      sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
				     length /* changed member */ );
	      ip0->checksum = ip_csum_fold (sum0);

	      /* Fix UDP length */
	      new_l0 = clib_net_to_host_u16 (u0->length);
	      new_l0 += len;
	      u0->length = clib_host_to_net_u16 (new_l0);
	    }
	  else
	    {
	      vlib_node_increment_counter
		(vm, dhcp_proxy_to_server_node.index,
		 DHCP_PROXY_ERROR_OPTION_82_ERROR, 1);
	    }

	  next0 = DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;

	  /*
	   * If we have multiple servers configured and this is the
	   * client's discover message, then send copies to each of
	   * those servers
	   */
	  if (is_discover && vec_len (proxy->dhcp_servers) > 1)
	    {
	      u32 ii;

	      for (ii = 1; ii < vec_len (proxy->dhcp_servers); ii++)
		{
		  vlib_buffer_t *c0;
		  u32 ci0;

		  c0 = vlib_buffer_copy (vm, b0);
		  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (c0);
		  ci0 = vlib_get_buffer_index (vm, c0);
		  server = &proxy->dhcp_servers[ii];

		  ip0 = vlib_buffer_get_current (c0);

		  sum0 = ip0->checksum;
		  old0 = ip0->dst_address.as_u32;
		  new0 = server->dhcp_server.ip4.as_u32;
		  ip0->dst_address.as_u32 = server->dhcp_server.ip4.as_u32;
		  sum0 = ip_csum_update (sum0, old0, new0,
					 ip4_header_t /* structure */ ,
					 dst_address /* changed member */ );
		  ip0->checksum = ip_csum_fold (sum0);

		  to_next[0] = ci0;
		  to_next += 1;
		  n_left_to_next -= 1;

		  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
						   to_next, n_left_to_next,
						   ci0, next0);

		  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
		    {
		      dhcp_proxy_trace_t *tr;

		      vlib_buffer_copy_trace_flag (vm, b0, ci0);
		      tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
		      tr->which = 0;	/* to server */
		      tr->error = error0;
		      tr->original_sw_if_index = original_sw_if_index;
		      tr->sw_if_index = sw_if_index;
		      if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
			tr->trace_ip4_address.as_u32 =
			  server->dhcp_server.ip4.as_u32;
		    }

		  if (PREDICT_FALSE (0 == n_left_to_next))
		    {
		      vlib_put_next_frame (vm, node, next_index,
					   n_left_to_next);
		      vlib_get_next_frame (vm, node, next_index,
					   to_next, n_left_to_next);
		    }
		}
	    }
	do_trace:
	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
						       b0, sizeof (*tr));
	      tr->which = 0;	/* to server */
	      tr->error = error0;
	      tr->original_sw_if_index = original_sw_if_index;
	      tr->sw_if_index = sw_if_index;
	      if (next0 == DHCP_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
		tr->trace_ip4_address.as_u32 =
		  proxy->dhcp_servers[0].dhcp_server.ip4.as_u32;
	    }

	do_enqueue:
	  to_next[0] = bi0;
	  to_next += 1;
	  n_left_to_next -= 1;

	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
  vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
			       DHCP_PROXY_ERROR_RELAY_TO_CLIENT,
			       pkts_to_client);
  vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
			       DHCP_PROXY_ERROR_RELAY_TO_SERVER,
			       pkts_to_server);
  vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
			       DHCP_PROXY_ERROR_NO_SERVER, pkts_no_server);
  vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
			       DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS,
			       pkts_no_interface_address);
  vlib_node_increment_counter (vm, dhcp_proxy_to_server_node.index,
			       DHCP_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
  return from_frame->n_vectors;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (dhcp_proxy_to_server_node, static) = {
  .function = dhcp_proxy_to_server_input,
  .name = "dhcp-proxy-to-server",
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),

  .n_errors = DHCP_PROXY_N_ERROR,
  .error_strings = dhcp_proxy_error_strings,

  .n_next_nodes = DHCP_PROXY_TO_SERVER_INPUT_N_NEXT,
  .next_nodes = {
#define _(s,n) [DHCP_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
    foreach_dhcp_proxy_to_server_input_next
#undef _
  },

  .format_buffer = format_dhcp_proxy_header_with_length,
  .format_trace = format_dhcp_proxy_trace,
#if 0
  .unformat_buffer = unformat_dhcp_proxy_header,
#endif
};
/* *INDENT-ON* */

static uword
dhcp_proxy_to_client_input (vlib_main_t * vm,
			    vlib_node_runtime_t * node,
			    vlib_frame_t * from_frame)
{
  u32 n_left_from, *from;
  ethernet_main_t *em = vnet_get_ethernet_main ();
  dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
  vnet_main_t *vnm = vnet_get_main ();
  ip4_main_t *im = &ip4_main;

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

  while (n_left_from > 0)
    {
      u32 bi0;
      vlib_buffer_t *b0;
      udp_header_t *u0;
      dhcp_header_t *h0;
      ip4_header_t *ip0 = 0;
      ip4_address_t *ia0 = 0;
      u32 old0, new0;
      ip_csum_t sum0;
      ethernet_interface_t *ei0;
      ethernet_header_t *mac0;
      vnet_hw_interface_t *hi0;
      vlib_frame_t *f0;
      u32 *to_next0;
      u32 sw_if_index = ~0;
      vnet_sw_interface_t *si0;
      u32 error0 = (u32) ~ 0;
      vnet_sw_interface_t *swif;
      u32 fib_index;
      dhcp_proxy_t *proxy;
      dhcp_server_t *server;
      u32 original_sw_if_index = (u32) ~ 0;
      ip4_address_t relay_addr = {
	.as_u32 = 0,
      };

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

      b0 = vlib_get_buffer (vm, bi0);
      h0 = vlib_buffer_get_current (b0);

      /*
       * udp_local hands us the DHCP header, need udp hdr,
       * ip hdr to relay to client
       */
      vlib_buffer_advance (b0, -(sizeof (*u0)));
      u0 = vlib_buffer_get_current (b0);

      vlib_buffer_advance (b0, -(sizeof (*ip0)));
      ip0 = vlib_buffer_get_current (b0);

      /* Consumed by dhcp client code? */
      if (dhcp_client_for_us (bi0, b0, ip0, u0, h0))
	continue;

      if (1 /* dpm->insert_option_82 */ )
	{
	  /* linearize needed to "unclone" and scan options */
	  int rv = vlib_buffer_chain_linearize (vm, b0);
	  if ((b0->flags & VLIB_BUFFER_NEXT_PRESENT) != 0 || !rv)
	    {
	      error0 = DHCP_PROXY_ERROR_PKT_TOO_BIG;
	      goto drop_packet;
	    }

	  dhcp_option_t *o = h0->options, *end =
	    (void *) vlib_buffer_get_tail (b0);

	  /* Parse through TLVs looking for option 82.
	     The circuit-ID is the FIB number we need
	     to track down the client-facing interface */

	  while (o->option != DHCP_PACKET_OPTION_END && o < end)
	    {
	      if (o->option == 82)
		{
		  u32 vss_exist = 0;
		  u32 vss_ctrl = 0;
		  dhcp_option_t *sub = (dhcp_option_t *) & o->data[0];
		  dhcp_option_t *subend =
		    (dhcp_option_t *) (o->data + o->length);
		  while (sub->option != DHCP_PACKET_OPTION_END
			 && sub < subend)
		    {
		      /* If this is one of ours, it will have
		         total length 12, circuit-id suboption type,
		         and the sw_if_index */
		      if (sub->option == 1 && sub->length == 4)
			{
			  sw_if_index = ((sub->data[0] << 24) |
					 (sub->data[1] << 16) |
					 (sub->data[2] << 8) |
					 (sub->data[3]));
			}
		      else if (sub->option == 5 && sub->length == 4)
			{
			  relay_addr.as_u8[0] = sub->data[0];
			  relay_addr.as_u8[1] = sub->data[1];
			  relay_addr.as_u8[2] = sub->data[2];
			  relay_addr.as_u8[3] = sub->data[3];
			}
		      else if (sub->option == 151 &&
			       sub->length == 7 && sub->data[0] == 1)
			vss_exist = 1;
		      else if (sub->option == 152 && sub->length == 0)
			vss_ctrl = 1;
		      sub = (dhcp_option_t *) (sub->data + sub->length);
		    }
		  if (vss_ctrl && vss_exist)
		    vlib_node_increment_counter
		      (vm, dhcp_proxy_to_client_node.index,
		       DHCP_PROXY_ERROR_OPTION_82_VSS_NOT_PROCESSED, 1);

		}
	      o = (dhcp_option_t *) (o->data + o->length);
	    }
	}

      if (sw_if_index == (u32) ~ 0)
	{
	  error0 = DHCP_PROXY_ERROR_NO_OPTION_82;

	drop_packet:
	  vlib_node_increment_counter (vm, dhcp_proxy_to_client_node.index,
				       error0, 1);
	  f0 = vlib_get_frame_to_node (vm, dpm->error_drop_node_index);
	  to_next0 = vlib_frame_vector_args (f0);
	  to_next0[0] = bi0;
	  f0->n_vectors = 1;
	  vlib_put_frame_to_node (vm, dpm->error_drop_node_index, f0);
	  goto do_trace;
	}

      if (relay_addr.as_u32 == 0)
	{
	  error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ADDR;
	  goto drop_packet;
	}

      if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
	{
	  error0 = DHCP_PROXY_ERROR_BAD_OPTION_82_ITF;
	  goto drop_packet;
	}

      fib_index = im->fib_index_by_sw_if_index[sw_if_index];
      proxy = dhcp_get_proxy (dpm, fib_index, FIB_PROTOCOL_IP4);

      if (PREDICT_FALSE (NULL == proxy))
	{
	  error0 = DHCP_PROXY_ERROR_NO_SERVER;
	  goto drop_packet;
	}

      vec_foreach (server, proxy->dhcp_servers)
      {
	if (ip0->src_address.as_u32 == server->dhcp_server.ip4.as_u32)
	  {
	    goto server_found;
	  }
      }

      error0 = DHCP_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
      goto drop_packet;

    server_found:
      vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;

      swif = vnet_get_sw_interface (vnm, sw_if_index);
      original_sw_if_index = sw_if_index;
      if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
	sw_if_index = swif->unnumbered_sw_if_index;

      ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
      if (ia0 == 0)
	{
	  error0 = DHCP_PROXY_ERROR_NO_INTERFACE_ADDRESS;
	  goto drop_packet;
	}

      if (relay_addr.as_u32 != ia0->as_u32)
	{
	  error0 = DHCP_PROXY_ERROR_BAD_YIADDR;
	  goto drop_packet;
	}

      u0->checksum = 0;
      u0->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcp_to_client);
      sum0 = ip0->checksum;
      old0 = ip0->dst_address.as_u32;
      new0 = 0xFFFFFFFF;
      ip0->dst_address.as_u32 = new0;
      sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
			     dst_address /* offset of changed member */ );
      ip0->checksum = ip_csum_fold (sum0);

      sum0 = ip0->checksum;
      old0 = ip0->src_address.as_u32;
      new0 = ia0->as_u32;
      ip0->src_address.as_u32 = new0;
      sum0 = ip_csum_update (sum0, old0, new0, ip4_header_t /* structure */ ,
			     src_address /* offset of changed member */ );
      ip0->checksum = ip_csum_fold (sum0);

      vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
      si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
      if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
	vlib_buffer_advance (b0, -4 /* space for VLAN tag */ );

      mac0 = vlib_buffer_get_current (b0);

      hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
      ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
      clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
      clib_memset (mac0->dst_address, 0xff, sizeof (mac0->dst_address));
      mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
	clib_net_to_host_u16 (0x8100) : clib_net_to_host_u16 (0x0800);

      if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
	{
	  u32 *vlan_tag = (u32 *) (mac0 + 1);
	  u32 tmp;
	  tmp = (si0->sub.id << 16) | 0x0800;
	  *vlan_tag = clib_host_to_net_u32 (tmp);
	}

      /* $$$ This needs to be rewritten, for sure */
      f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
      to_next0 = vlib_frame_vector_args (f0);
      to_next0[0] = bi0;
      f0->n_vectors = 1;
      vlib_put_frame_to_node (vm, hi0->output_node_index, f0);

    do_trace:
      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	  dhcp_proxy_trace_t *tr = vlib_add_trace (vm, node,
						   b0, sizeof (*tr));
	  tr->which = 1;	/* to client */
	  tr->trace_ip4_address.as_u32 = ia0 ? ia0->as_u32 : 0;
	  tr->error = error0;
	  tr->original_sw_if_index = original_sw_if_index;
	  tr->sw_if_index = sw_if_index;
	}
    }

  return from_frame->n_vectors;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (dhcp_proxy_to_client_node, static) = {
  .function = dhcp_proxy_to_client_input,
  .name = "dhcp-proxy-to-client",
  /* Takes a vector of packets. */
  .vector_size = sizeof (u32),

  .n_errors = DHCP_PROXY_N_ERROR,
  .error_strings = dhcp_proxy_error_strings,
  .format_buffer = format_dhcp_proxy_header_with_length,
  .format_trace = format_dhcp_proxy_trace,
#if 0
  .unformat_buffer = unformat_dhcp_proxy_header,
#endif
};
/* *INDENT-ON* */

void
dhcp_maybe_register_udp_ports (dhcp_port_reg_flags_t ports)
{
  dhcp_proxy_main_t *dm = &dhcp_proxy_main;
  vlib_main_t *vm = dm->vlib_main;
  int port_regs_diff = dm->udp_ports_registered ^ ports;

  if (!port_regs_diff)
    return;

  if ((port_regs_diff & DHCP_PORT_REG_CLIENT) & ports)
    udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_client,
			   dhcp_proxy_to_client_node.index, 1 /* is_ip4 */ );

  if ((port_regs_diff & DHCP_PORT_REG_SERVER) & ports)
    udp_register_dst_port (vm, UDP_DST_PORT_dhcp_to_server,
			   dhcp_proxy_to_server_node.index, 1 /* is_ip4 */ );

  dm->udp_ports_registered |= ports;
}

static clib_error_t *
dhcp4_proxy_init (vlib_main_t * vm)
{
  dhcp_proxy_main_t *dm = &dhcp_proxy_main;
  vlib_node_t *error_drop_node;

  error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
  dm->error_drop_node_index = error_drop_node->index;
  dm->vlib_main = vm;

  return 0;
}


VLIB_INIT_FUNCTION (dhcp4_proxy_init);

int
dhcp4_proxy_set_server (ip46_address_t * addr,
			ip46_address_t * src_addr,
			u32 rx_table_id, u32 server_table_id, int is_del)
{
  u32 rx_fib_index = 0;
  int rc = 0;

  const fib_prefix_t all_1s = {
    .fp_len = 32,
    .fp_addr.ip4.as_u32 = 0xffffffff,
    .fp_proto = FIB_PROTOCOL_IP4,
  };

  if (ip46_address_is_zero (addr))
    return VNET_API_ERROR_INVALID_DST_ADDRESS;

  if (ip46_address_is_zero (src_addr))
    return VNET_API_ERROR_INVALID_SRC_ADDRESS;

  dhcp_maybe_register_udp_ports (DHCP_PORT_REG_CLIENT | DHCP_PORT_REG_SERVER);

  rx_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
						    rx_table_id,
						    FIB_SOURCE_DHCP);

  if (is_del)
    {
      if (dhcp_proxy_server_del (FIB_PROTOCOL_IP4, rx_fib_index,
				 addr, server_table_id))
	{
	  fib_table_entry_special_remove (rx_fib_index,
					  &all_1s, FIB_SOURCE_DHCP);
	  fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
	}
    }
  else
    {
      if (dhcp_proxy_server_add (FIB_PROTOCOL_IP4,
				 addr, src_addr,
				 rx_fib_index, server_table_id))
	{
	  fib_table_entry_special_add (rx_fib_index,
				       &all_1s,
				       FIB_SOURCE_DHCP, FIB_ENTRY_FLAG_LOCAL);
	  fib_table_lock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);
	}
    }
  fib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_DHCP);

  return (rc);
}

static clib_error_t *
dhcp4_proxy_set_command_fn (vlib_main_t * vm,
			    unformat_input_t * input,
			    vlib_cli_command_t * cmd)
{
  ip46_address_t server_addr, src_addr;
  u32 server_table_id = 0, rx_table_id = 0;
  int is_del = 0;
  int set_src = 0, set_server = 0;

  clib_memset (&server_addr, 0, sizeof (server_addr));
  clib_memset (&src_addr, 0, sizeof (src_addr));

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "server %U",
		    unformat_ip4_address, &server_addr.ip4))
	set_server = 1;
      else if (unformat (input, "server-fib-id %d", &server_table_id))
	;
      else if (unformat (input, "rx-fib-id %d", &rx_table_id))
	;
      else if (unformat (input, "src-address %U",
			 unformat_ip4_address, &src_addr.ip4))
	set_src = 1;
      else if (unformat (input, "delete") || unformat (input, "del"))
	is_del = 1;
      else
	break;
    }

  if (is_del || (set_server && set_src))
    {
      int rv;

      rv = dhcp4_proxy_set_server (&server_addr, &src_addr, rx_table_id,
				   server_table_id, is_del);
      switch (rv)
	{
	case 0:
	  return 0;

	case VNET_API_ERROR_INVALID_DST_ADDRESS:
	  return clib_error_return (0, "Invalid server address");

	case VNET_API_ERROR_INVALID_SRC_ADDRESS:
	  return clib_error_return (0, "Invalid src address");

	case VNET_API_ERROR_NO_SUCH_ENTRY:
	  return clib_error_return
	    (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);

	default:
	  return clib_error_return (0, "BUG: rv %d", rv);
	}
    }
  else
    return clib_error_return (0, "parse error`%U'",
			      format_unformat_error, input);
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcp_proxy_set_command, static) = {
  .path = "set dhcp proxy",
  .short_help = "set dhcp proxy [del] server <ip-addr> src-address <ip-addr> [server-fib-id <n>] [rx-fib-id <n>]",
  .function = dhcp4_proxy_set_command_fn,
};
/* *INDENT-ON* */

static u8 *
format_dhcp4_proxy_server (u8 * s, va_list * args)
{
  dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
  ip4_fib_t *rx_fib, *server_fib;
  dhcp_server_t *server;

  if (proxy == 0)
    {
      s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
		  "Servers FIB,Address");
      return s;
    }

  rx_fib = ip4_fib_get (proxy->rx_fib_index);

  s = format (s, "%=14u%=16U",
	      rx_fib->table_id,
	      format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);

  vec_foreach (server, proxy->dhcp_servers)
  {
    server_fib = ip4_fib_get (server->server_fib_index);
    s = format (s, "%u,%U  ",
		server_fib->table_id,
		format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
  }
  return s;
}

static int
dhcp4_proxy_show_walk (dhcp_proxy_t * server, void *ctx)
{
  vlib_main_t *vm = ctx;

  vlib_cli_output (vm, "%U", format_dhcp4_proxy_server, server);

  return (1);
}

static clib_error_t *
dhcp4_proxy_show_command_fn (vlib_main_t * vm,
			     unformat_input_t * input,
			     vlib_cli_command_t * cmd)
{
  vlib_cli_output (vm, "%U", format_dhcp4_proxy_server,
		   NULL /* header line */ );

  dhcp_proxy_walk (FIB_PROTOCOL_IP4, dhcp4_proxy_show_walk, vm);

  return (NULL);
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcp_proxy_show_command, static) = {
  .path = "show dhcp proxy",
  .short_help = "Display dhcp proxy server info",
  .function = dhcp4_proxy_show_command_fn,
};
/* *INDENT-ON* */

static clib_error_t *
dhcp_option_82_vss_fn (vlib_main_t * vm,
		       unformat_input_t * input, vlib_cli_command_t * cmd)
{
  u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
  u32 oui = 0, fib_id = 0, tbl_id = ~0;
  u8 *vpn_ascii_id = 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "table %d", &tbl_id))
	;
      else if (unformat (input, "oui %d", &oui))
	vss_type = VSS_TYPE_VPN_ID;
      else if (unformat (input, "vpn-id %d", &fib_id))
	vss_type = VSS_TYPE_VPN_ID;
      else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
	vss_type = VSS_TYPE_ASCII;
      else if (unformat (input, "delete") || unformat (input, "del"))
	is_del = 1;
      else
	break;
    }

  if (tbl_id == ~0)
    return clib_error_return (0, "no table ID specified.");

  int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP4, tbl_id, vss_type,
			       vpn_ascii_id, oui, fib_id, is_del);
  switch (rv)
    {
    case 0:
      return 0;
    case VNET_API_ERROR_NO_SUCH_ENTRY:
      return clib_error_return (0,
				"option 82 vss for table %d not found in in pool.",
				tbl_id);
    default:
      return clib_error_return (0, "BUG: rv %d", rv);

    }
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcp_proxy_vss_command,static) = {
  .path = "set dhcp option-82 vss",
  .short_help = "set dhcp option-82 vss [del] table <table id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
  .function = dhcp_option_82_vss_fn,
};
/* *INDENT-ON* */

static clib_error_t *
dhcp_vss_show_command_fn (vlib_main_t * vm,
			  unformat_input_t * input, vlib_cli_command_t * cmd)
{
  dhcp_vss_walk (FIB_PROTOCOL_IP4, dhcp_vss_show_walk, vm);

  return (NULL);
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcp_proxy_vss_show_command, static) = {
  .path = "show dhcp vss",
  .short_help = "show dhcp VSS",
  .function = dhcp_vss_show_command_fn,
};
/* *INDENT-ON* */

static clib_error_t *
dhcp_option_82_address_show_command_fn (vlib_main_t * vm,
					unformat_input_t * input,
					vlib_cli_command_t * cmd)
{
  vnet_main_t *vnm = vnet_get_main ();
  u32 sw_if_index0 = 0, sw_if_index;
  vnet_sw_interface_t *swif;
  ip4_address_t *ia0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {

      if (unformat (input, "%U",
		    unformat_vnet_sw_interface, vnm, &sw_if_index0))
	{
	  swif = vnet_get_sw_interface (vnm, sw_if_index0);
	  sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
	    swif->unnumbered_sw_if_index : sw_if_index0;
	  ia0 = ip4_interface_first_address (&ip4_main, sw_if_index, 0);
	  if (ia0)
	    {
	      vlib_cli_output (vm, "%=20s%=20s", "interface",
			       "source IP address");

	      vlib_cli_output (vm, "%=20U%=20U",
			       format_vnet_sw_if_index_name,
			       vnm, sw_if_index0, format_ip4_address, ia0);
	    }
	  else
	    vlib_cli_output (vm, "%=34s %=20U",
			     "No IPv4 address configured on",
			     format_vnet_sw_if_index_name, vnm, sw_if_index);
	}
      else
	break;
    }

  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (dhcp_proxy_address_show_command,static) = {
  .path = "show dhcp option-82-address interface",
  .short_help = "show dhcp option-82-address interface <interface>",
  .function = dhcp_option_82_address_show_command_fn,
};
/* *INDENT-ON* */

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