src/vnet/dhcp/dhcp6_proxy_node.c

   1 /*
   2  * dhcp6_proxy_node.c: dhcpv6 proxy node processing
   3  *
   4  * Copyright (c) 2013 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <vlib/vlib.h>
  19 #include <vnet/pg/pg.h>
  20 #include <vnet/dhcp/dhcp_proxy.h>
  21 #include <vnet/dhcp/dhcp6_packet.h>
  22 #include <vnet/mfib/mfib_table.h>
  23 #include <vnet/mfib/ip6_mfib.h>
  24 #include <vnet/fib/fib.h>
  25
  26 static char * dhcpv6_proxy_error_strings[] = {
  27 #define dhcpv6_proxy_error(n,s) s,
  28 #include <vnet/dhcp/dhcp6_proxy_error.def>
  29 #undef dhcpv6_proxy_error
  30 };
  31
  32 #define foreach_dhcpv6_proxy_to_server_input_next \
  33   _ (DROP, "error-drop")                        \
  34   _ (LOOKUP, "ip6-lookup")                      \
  35   _ (SEND_TO_CLIENT, "dhcpv6-proxy-to-client")
  36
  37
  38 typedef enum {
  39 #define _(s,n) DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s,
  40   foreach_dhcpv6_proxy_to_server_input_next
  41 #undef _
  42   DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
  43 } dhcpv6_proxy_to_server_input_next_t;
  44
  45 typedef struct {
  46   /* 0 => to server, 1 => to client */
  47   int which;
  48   u8 packet_data[64];
  49   u32 error;
  50   u32 sw_if_index;
  51   u32 original_sw_if_index;
  52 } dhcpv6_proxy_trace_t;
  53
  54 static vlib_node_registration_t dhcpv6_proxy_to_server_node;
  55 static vlib_node_registration_t dhcpv6_proxy_to_client_node;
  56
  57 /* all DHCP servers address */
  58 static ip6_address_t all_dhcpv6_server_address;
  59 static ip6_address_t all_dhcpv6_server_relay_agent_address;
  60
  61 static u8 *
  62 format_dhcpv6_proxy_trace (u8 * s, va_list * args)
  63 {
  64   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  65   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  66   dhcpv6_proxy_trace_t * t = va_arg (*args, dhcpv6_proxy_trace_t *);
  67
  68   if (t->which == 0)
  69     s = format (s, "DHCPV6 proxy: sent to server %U",
  70                 format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
  71   else
  72     s = format (s, "DHCPV6 proxy: sent to client from %U",
  73                 format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
  74   if (t->error != (u32)~0)
  75     s = format (s, " error: %s\n", dhcpv6_proxy_error_strings[t->error]);
  76
  77   s = format (s, "  original_sw_if_index: %d, sw_if_index: %d\n",
  78               t->original_sw_if_index, t->sw_if_index);
  79
  80   return s;
  81 }
  82
  83 static u8 *
  84 format_dhcpv6_proxy_header_with_length (u8 * s, va_list * args)
  85 {
  86   dhcpv6_header_t * h = va_arg (*args, dhcpv6_header_t *);
  87   u32 max_header_bytes = va_arg (*args, u32);
  88   u32 header_bytes;
  89
  90   header_bytes = sizeof (h[0]);
  91   if (max_header_bytes != 0 && header_bytes > max_header_bytes)
  92     return format (s, "dhcpv6 header truncated");
  93
  94   s = format (s, "DHCPV6 Proxy");
  95
  96   return s;
  97 }
  98 /* get first interface address */
  99 static ip6_address_t *
 100 ip6_interface_first_global_or_site_address (ip6_main_t * im, u32 sw_if_index)
 101 {
 102   ip_lookup_main_t * lm = &im->lookup_main;
 103   ip_interface_address_t * ia = 0;
 104   ip6_address_t * result = 0;
 105
 106   foreach_ip_interface_address (lm, ia, sw_if_index,
 107                                 1 /* honor unnumbered */,
 108   ({
 109     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 110     if ((a->as_u8[0] & 0xe0) == 0x20 ||
 111         (a->as_u8[0] & 0xfe) == 0xfc)  {
 112         result = a;
 113         break;
 114     }
 115   }));
 116   return result;
 117 }
 118
 119 static inline void copy_ip6_address (ip6_address_t *dst,
 120                                      ip6_address_t *src)
 121 {
 122   dst->as_u64[0] = src->as_u64[0];
 123   dst->as_u64[1] = src->as_u64[1];
 124 }
 125
 126 static uword
 127 dhcpv6_proxy_to_server_input (vlib_main_t * vm,
 128                               vlib_node_runtime_t * node,
 129                               vlib_frame_t * from_frame)
 130 {
 131   u32 n_left_from, next_index, * from, * to_next;
 132   dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
 133   from = vlib_frame_vector_args (from_frame);
 134   n_left_from = from_frame->n_vectors;
 135   u32 pkts_to_server=0, pkts_to_client=0, pkts_no_server=0;
 136   u32 pkts_no_interface_address=0, pkts_no_exceeding_max_hop=0;
 137   u32 pkts_no_src_address=0;
 138   u32 pkts_wrong_msg_type=0;
 139   u32 pkts_too_big=0;
 140   ip6_main_t * im = &ip6_main;
 141   ip6_address_t * src;
 142   int bogus_length;
 143   dhcp_proxy_t *proxy;
 144   dhcp_server_t *server;
 145   u32  rx_fib_idx = 0, server_fib_idx = 0;
 146
 147   next_index = node->cached_next_index;
 148
 149   while (n_left_from > 0)
 150     {
 151       u32 n_left_to_next;
 152
 153       vlib_get_next_frame (vm, node, next_index,
 154                            to_next, n_left_to_next);
 155
 156       while (n_left_from > 0 && n_left_to_next > 0)
 157         {
 158           vnet_main_t *vnm = vnet_get_main();
 159           u32 sw_if_index = 0;
 160           u32 rx_sw_if_index = 0;
 161           vnet_sw_interface_t *swif;
 162           u32 bi0;
 163           vlib_buffer_t * b0;
 164           udp_header_t * u0, *u1;
 165           dhcpv6_header_t * h0;  // client msg hdr
 166           ip6_header_t * ip0, *ip1;
 167           ip6_address_t _ia0, *ia0=&_ia0;
 168           u32 next0;
 169           u32 error0 = (u32) ~0;
 170           dhcpv6_option_t *fwd_opt;
 171           dhcpv6_relay_hdr_t *r1;
 172           u16 len;
 173           dhcpv6_int_id_t *id1;
 174           dhcpv6_vss_t *vss1;
 175           dhcpv6_client_mac_t *cmac; // client mac
 176           ethernet_header_t * e_h0;
 177           u8 client_src_mac[6];
 178           vlib_buffer_free_list_t *fl;
 179           dhcp_vss_t *vss;
 180           u8 is_solicit = 0;
 181
 182           bi0 = from[0];
 183           from += 1;
 184           n_left_from -= 1;
 185
 186           b0 = vlib_get_buffer (vm, bi0);
 187
 188           h0 = vlib_buffer_get_current (b0);
 189
 190           /*
 191            * udp_local hands us the DHCPV6 header.
 192            */
 193           u0 = (void *)h0 -(sizeof(*u0));
 194           ip0 = (void *)u0 -(sizeof(*ip0));
 195           e_h0 = (void *)ip0 - ethernet_buffer_header_size(b0);
 196
 197           clib_memcpy(client_src_mac, e_h0->src_address, 6);
 198
 199           switch (h0->u.msg_type) {
 200             case DHCPV6_MSG_SOLICIT:
 201             case DHCPV6_MSG_REQUEST:
 202             case DHCPV6_MSG_CONFIRM:
 203             case DHCPV6_MSG_RENEW:
 204             case DHCPV6_MSG_REBIND:
 205             case DHCPV6_MSG_RELEASE:
 206             case DHCPV6_MSG_DECLINE:
 207             case DHCPV6_MSG_INFORMATION_REQUEST:
 208             case DHCPV6_MSG_RELAY_FORW:
 209                 /* send to server */
 210                 break;
 211             case DHCPV6_MSG_RELAY_REPL:
 212                 /* send to client */
 213                 next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
 214                 error0 = 0;
 215                 pkts_to_client++;
 216                 goto do_enqueue;
 217             default:
 218                 /* drop the packet */
 219                 pkts_wrong_msg_type++;
 220                 error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 221                 next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 222                 goto do_trace;
 223
 224           }
 225
 226           /* Send to DHCPV6 server via the configured FIB */
 227           rx_sw_if_index = sw_if_index =  vnet_buffer(b0)->sw_if_index[VLIB_RX];
 228           rx_fib_idx = im->mfib_index_by_sw_if_index [rx_sw_if_index];
 229           proxy = dhcp_get_proxy(dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
 230
 231           if (PREDICT_FALSE (NULL == proxy))
 232           {
 233               error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 234               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 235               pkts_no_server++;
 236               goto do_trace;
 237           }
 238
 239           server = &proxy->dhcp_servers[0];
 240           server_fib_idx = server->server_fib_index;
 241           vnet_buffer(b0)->sw_if_index[VLIB_TX] = server_fib_idx;
 242
 243
 244           /* relay-option header pointer */
 245           vlib_buffer_advance(b0, -(sizeof(*fwd_opt)));
 246           fwd_opt = vlib_buffer_get_current(b0);
 247           /* relay message header pointer */
 248           vlib_buffer_advance(b0, -(sizeof(*r1)));
 249           r1 = vlib_buffer_get_current(b0);
 250
 251           vlib_buffer_advance(b0, -(sizeof(*u1)));
 252           u1 = vlib_buffer_get_current(b0);
 253
 254           vlib_buffer_advance(b0, -(sizeof(*ip1)));
 255           ip1 = vlib_buffer_get_current(b0);
 256
 257           /* fill in all that rubbish... */
 258           len = clib_net_to_host_u16(u0->length) - sizeof(udp_header_t);
 259           copy_ip6_address(&r1->peer_addr, &ip0->src_address);
 260
 261           r1->msg_type = DHCPV6_MSG_RELAY_FORW;
 262           fwd_opt->length = clib_host_to_net_u16(len);
 263           fwd_opt->option = clib_host_to_net_u16(DHCPV6_OPTION_RELAY_MSG);
 264
 265           r1->hop_count++;
 266           r1->hop_count = (h0->u.msg_type != DHCPV6_MSG_RELAY_FORW) ? 0 : r1->hop_count;
 267
 268           if (PREDICT_FALSE(r1->hop_count >= HOP_COUNT_LIMIT))
 269             {
 270               error0 =  DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 271               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 272               pkts_no_exceeding_max_hop++;
 273               goto do_trace;
 274             }
 275
 276
 277           /* If relay-fwd and src address is site or global unicast address  */
 278           if (h0->u.msg_type == DHCPV6_MSG_RELAY_FORW &&
 279               ((ip0->src_address.as_u8[0] & 0xe0) == 0x20 ||
 280                (ip0->src_address.as_u8[0] & 0xfe) == 0xfc))
 281             {
 282               /* Set link address to zero */
 283               r1->link_addr.as_u64[0] = 0;
 284               r1->link_addr.as_u64[1] = 0;
 285               goto link_address_set;
 286             }
 287
 288           /* if receiving interface is unnumbered, use receiving interface
 289            * IP address as link address, otherwise use the loopback interface
 290            * IP address as link address.
 291            */
 292
 293           swif = vnet_get_sw_interface (vnm, rx_sw_if_index);
 294           if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 295               sw_if_index = swif->unnumbered_sw_if_index;
 296
 297           ia0 = ip6_interface_first_global_or_site_address(&ip6_main, sw_if_index);
 298           if (ia0 == 0)
 299             {
 300               error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 301               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 302               pkts_no_interface_address++;
 303               goto do_trace;
 304             }
 305
 306           copy_ip6_address(&r1->link_addr, ia0);
 307
 308         link_address_set:
 309           fl = vlib_buffer_get_free_list (vm, vlib_buffer_get_free_list_index (b0));
 310
 311           if ((b0->current_length+sizeof(*id1)+sizeof(*vss1)+sizeof(*cmac))
 312               > fl->n_data_bytes)
 313             {
 314               error0 = DHCPV6_PROXY_ERROR_PKT_TOO_BIG;
 315               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 316               pkts_too_big++;
 317               goto do_trace;
 318             }
 319
 320           id1 = (dhcpv6_int_id_t *) (((uword) ip1) + b0->current_length);
 321           b0->current_length += (sizeof (*id1));
 322
 323           id1->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_INTERFACE_ID);
 324           id1->opt.length = clib_host_to_net_u16(sizeof(rx_sw_if_index));
 325           id1->int_idx = clib_host_to_net_u32(rx_sw_if_index);
 326
 327           u1->length =0;
 328           if (h0->u.msg_type != DHCPV6_MSG_RELAY_FORW)
 329             {
 330                cmac = (dhcpv6_client_mac_t *) (((uword) ip1) + b0->current_length);
 331                b0->current_length += (sizeof (*cmac));
 332                cmac->opt.length =clib_host_to_net_u16(sizeof(*cmac) -
 333                                                       sizeof(cmac->opt));
 334                cmac->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_CLIENT_LINK_LAYER_ADDRESS);
 335                cmac->link_type = clib_host_to_net_u16(1); /* ethernet */
 336                clib_memcpy(cmac->data, client_src_mac, 6);
 337                u1->length += sizeof(*cmac);
 338             }
 339
 340           vss = dhcp_get_vss_info(dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
 341
 342           if (vss)
 343             {
 344               u16 id_len;       /* length of VPN ID */
 345               u16 type_len = sizeof (vss1->vss_type);
 346
 347               vss1 = (dhcpv6_vss_t *) (((uword) ip1) + b0->current_length);
 348               vss1->vss_type = vss->vss_type;
 349               if (vss->vss_type == VSS_TYPE_VPN_ID)
 350                 {
 351                   id_len = sizeof (vss->vpn_id);        /* vpn_id is 7 bytes */
 352                   memcpy (vss1->data, vss->vpn_id, id_len);
 353                 }
 354               else if (vss->vss_type == VSS_TYPE_ASCII)
 355                 {
 356                   id_len = vec_len (vss->vpn_ascii_id);
 357                   memcpy (vss1->data, vss->vpn_ascii_id, id_len);
 358                 }
 359               else      /* must be VSS_TYPE_DEFAULT, no VPN ID */
 360                 id_len = 0;
 361
 362               vss1->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_VSS);
 363               vss1->opt.length = clib_host_to_net_u16 (type_len + id_len);
 364               u1->length += type_len + id_len + sizeof (vss1->opt);
 365               b0->current_length += type_len + id_len + sizeof (vss1->opt);
 366             }
 367
 368           pkts_to_server++;
 369           u1->checksum = 0;
 370           u1->src_port = clib_host_to_net_u16(UDP_DST_PORT_dhcpv6_to_client);
 371           u1->dst_port = clib_host_to_net_u16(UDP_DST_PORT_dhcpv6_to_server);
 372
 373           u1->length =
 374               clib_host_to_net_u16( clib_net_to_host_u16(fwd_opt->length) +
 375                                     sizeof(*r1) + sizeof(*fwd_opt) +
 376                                     sizeof(*u1) + sizeof(*id1) + u1->length);
 377
 378           memset(ip1, 0, sizeof(*ip1));
 379           ip1->ip_version_traffic_class_and_flow_label = 0x60;
 380           ip1->payload_length =  u1->length;
 381           ip1->protocol = PROTO_UDP;
 382           ip1->hop_limit = HOP_COUNT_LIMIT;
 383           src = ((server->dhcp_server.ip6.as_u64[0] ||
 384                   server->dhcp_server.ip6.as_u64[1]) ?
 385                  &server->dhcp_server.ip6 :
 386                  &all_dhcpv6_server_address);
 387           copy_ip6_address(&ip1->dst_address, src);
 388
 389
 390           ia0 = ip6_interface_first_global_or_site_address
 391               (&ip6_main, vnet_buffer(b0)->sw_if_index[VLIB_RX]);
 392
 393               src = (proxy->dhcp_src_address.ip6.as_u64[0] ||
 394                      proxy->dhcp_src_address.ip6.as_u64[1]) ?
 395                 &proxy->dhcp_src_address.ip6 : ia0;
 396           if (ia0 == 0)
 397             {
 398               error0 = DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS;
 399               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 400               pkts_no_src_address++;
 401               goto do_trace;
 402             }
 403
 404           copy_ip6_address (&ip1->src_address, src);
 405
 406
 407           u1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, ip1,
 408                                                            &bogus_length);
 409           ASSERT(bogus_length == 0);
 410
 411           next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
 412
 413           is_solicit = (DHCPV6_MSG_SOLICIT == h0->u.msg_type);
 414
 415           /*
 416            * If we have multiple servers configured and this is the
 417            * client's discover message, then send copies to each of
 418            * those servers
 419            */
 420           if (is_solicit && vec_len(proxy->dhcp_servers) > 1)
 421           {
 422               u32 ii;
 423
 424               for (ii = 1; ii < vec_len(proxy->dhcp_servers); ii++)
 425               {
 426                   vlib_buffer_t *c0;
 427                   u32 ci0;
 428
 429                   c0 = vlib_buffer_copy(vm, b0);
 430                   ci0 = vlib_get_buffer_index(vm, c0);
 431                   server = &proxy->dhcp_servers[ii];
 432
 433                   ip0 = vlib_buffer_get_current (c0);
 434
 435                   src = ((server->dhcp_server.ip6.as_u64[0] ||
 436                           server->dhcp_server.ip6.as_u64[1]) ?
 437                          &server->dhcp_server.ip6 :
 438                          &all_dhcpv6_server_address);
 439                   copy_ip6_address(&ip1->dst_address, src);
 440
 441                   to_next[0] = ci0;
 442                   to_next += 1;
 443                   n_left_to_next -= 1;
 444
 445                   vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 446                                                    to_next, n_left_to_next,
 447                                                    ci0, next0);
 448
 449                   if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 450                   {
 451                       dhcpv6_proxy_trace_t *tr;
 452
 453                       tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
 454                       tr->which = 0; /* to server */
 455                       tr->error = error0;
 456                       tr->original_sw_if_index = rx_sw_if_index;
 457                       tr->sw_if_index = sw_if_index;
 458                       if (next0 == DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
 459                           copy_ip6_address((ip6_address_t *)&tr->packet_data[0],
 460                                            &server->dhcp_server.ip6);
 461                   }
 462
 463                   if (PREDICT_FALSE(0 == n_left_to_next))
 464                   {
 465                       vlib_put_next_frame (vm, node, next_index,
 466                                            n_left_to_next);
 467                       vlib_get_next_frame (vm, node, next_index,
 468                                            to_next, n_left_to_next);
 469                   }
 470               }
 471           }
 472
 473         do_trace:
 474           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 475             {
 476                dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 477                                                           b0, sizeof (*tr));
 478                tr->which = 0; /* to server */
 479                tr->error = error0;
 480                tr->original_sw_if_index = rx_sw_if_index;
 481                tr->sw_if_index = sw_if_index;
 482                if (DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP == next0)
 483                  copy_ip6_address((ip6_address_t *)&tr->packet_data[0], &server->dhcp_server.ip6);
 484             }
 485
 486         do_enqueue:
 487           to_next[0] = bi0;
 488           to_next += 1;
 489           n_left_to_next -= 1;
 490
 491           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 492                                            to_next, n_left_to_next,
 493                                            bi0, next0);
 494         }
 495
 496       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 497     }
 498
 499   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 500                                DHCPV6_PROXY_ERROR_RELAY_TO_CLIENT,
 501                                pkts_to_client);
 502   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 503                                DHCPV6_PROXY_ERROR_RELAY_TO_SERVER,
 504                                pkts_to_server);
 505   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 506                                DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS,
 507                                pkts_no_interface_address);
 508   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 509                                DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE,
 510                                pkts_wrong_msg_type);
 511   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 512                                DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS,
 513                                pkts_no_src_address);
 514   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 515                                DHCPV6_PROXY_ERROR_PKT_TOO_BIG,
 516                                pkts_too_big);
 517   return from_frame->n_vectors;
 518 }
 519
 520 VLIB_REGISTER_NODE (dhcpv6_proxy_to_server_node, static) = {
 521   .function = dhcpv6_proxy_to_server_input,
 522   .name = "dhcpv6-proxy-to-server",
 523   /* Takes a vector of packets. */
 524   .vector_size = sizeof (u32),
 525
 526   .n_errors = DHCPV6_PROXY_N_ERROR,
 527   .error_strings = dhcpv6_proxy_error_strings,
 528
 529   .n_next_nodes = DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
 530   .next_nodes = {
 531 #define _(s,n) [DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
 532     foreach_dhcpv6_proxy_to_server_input_next
 533 #undef _
 534   },
 535
 536   .format_buffer = format_dhcpv6_proxy_header_with_length,
 537   .format_trace = format_dhcpv6_proxy_trace,
 538 #if 0
 539   .unformat_buffer = unformat_dhcpv6_proxy_header,
 540 #endif
 541 };
 542
 543 static uword
 544 dhcpv6_proxy_to_client_input (vlib_main_t * vm,
 545                             vlib_node_runtime_t * node,
 546                             vlib_frame_t * from_frame)
 547 {
 548
 549   u32 n_left_from, * from;
 550   ethernet_main_t *em = ethernet_get_main (vm);
 551   dhcp_proxy_main_t * dm = &dhcp_proxy_main;
 552   dhcp_proxy_t *proxy;
 553   dhcp_server_t *server;
 554   vnet_main_t * vnm = vnet_get_main();
 555   int bogus_length;
 556
 557   from = vlib_frame_vector_args (from_frame);
 558   n_left_from = from_frame->n_vectors;
 559
 560   while (n_left_from > 0)
 561     {
 562       u32 bi0;
 563       vlib_buffer_t * b0;
 564       udp_header_t * u0, *u1=0;
 565       dhcpv6_relay_hdr_t * h0;
 566       ip6_header_t * ip1 = 0, *ip0;
 567       ip6_address_t _ia0, * ia0 = &_ia0;
 568       ip6_address_t client_address;
 569       ethernet_interface_t *ei0;
 570       ethernet_header_t *mac0;
 571       vnet_hw_interface_t *hi0;
 572       vlib_frame_t *f0;
 573       u32 * to_next0;
 574       u32 sw_if_index = ~0;
 575       u32 original_sw_if_index = ~0;
 576       vnet_sw_interface_t *si0;
 577       u32 error0 = (u32)~0;
 578       vnet_sw_interface_t *swif;
 579       dhcpv6_option_t *r0 = 0, *o;
 580       u16 len = 0;
 581       u8 interface_opt_flag = 0;
 582       u8 relay_msg_opt_flag = 0;
 583       ip6_main_t * im = &ip6_main;
 584       u32 server_fib_idx, client_fib_idx;
 585
 586       bi0 = from[0];
 587       from += 1;
 588       n_left_from -= 1;
 589
 590       b0 = vlib_get_buffer (vm, bi0);
 591       h0 = vlib_buffer_get_current (b0);
 592
 593       if (DHCPV6_MSG_RELAY_REPL != h0->msg_type)
 594         {
 595           error0 =  DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 596
 597         drop_packet:
 598           vlib_node_increment_counter (vm, dhcpv6_proxy_to_client_node.index,
 599                                        error0, 1);
 600
 601           f0 = vlib_get_frame_to_node (vm, dm->error_drop_node_index);
 602           to_next0 = vlib_frame_vector_args (f0);
 603           to_next0[0] = bi0;
 604           f0->n_vectors = 1;
 605           vlib_put_frame_to_node (vm, dm->error_drop_node_index, f0);
 606           goto do_trace;
 607         }
 608       /* hop count seems not need to be checked */
 609       if (HOP_COUNT_LIMIT < h0->hop_count)
 610         {
 611           error0 =  DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 612           goto drop_packet;
 613         }
 614       u0 = (void *)h0 -(sizeof(*u0));
 615       ip0 = (void *)u0 -(sizeof(*ip0));
 616
 617       vlib_buffer_advance (b0, sizeof(*h0));
 618       o = vlib_buffer_get_current (b0);
 619
 620       /* Parse through TLVs looking for option 18 (DHCPV6_OPTION_INTERFACE_ID)
 621          _and_ option 9 (DHCPV6_OPTION_RELAY_MSG) option which must be there.
 622          Currently assuming no other options need to be processed
 623          The interface-ID is the FIB number we need
 624          to track down the client-facing interface */
 625
 626       while ((u8 *) o < (b0->data + b0->current_data + b0->current_length))
 627         {
 628            if (DHCPV6_OPTION_INTERFACE_ID == clib_net_to_host_u16(o->option))
 629              {
 630                 interface_opt_flag = 1;
 631                 if (clib_net_to_host_u16(o->length) == sizeof(sw_if_index))
 632                     sw_if_index = clib_net_to_host_u32(((dhcpv6_int_id_t*)o)->int_idx);
 633                 if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
 634                   {
 635                     error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION;
 636                     goto drop_packet;
 637                   }
 638              }
 639            if (DHCPV6_OPTION_RELAY_MSG == clib_net_to_host_u16(o->option))
 640              {
 641                 relay_msg_opt_flag = 1;
 642                 r0 = vlib_buffer_get_current (b0);
 643              }
 644            if ((relay_msg_opt_flag == 1) && (interface_opt_flag == 1))
 645              break;
 646            vlib_buffer_advance (b0, sizeof(*o) + clib_net_to_host_u16(o->length));
 647            o = (dhcpv6_option_t *) (((uword) o) + clib_net_to_host_u16(o->length) + sizeof(*o));
 648         }
 649
 650       if ((relay_msg_opt_flag == 0) || (r0 == 0))
 651         {
 652           error0 = DHCPV6_PROXY_ERROR_NO_RELAY_MESSAGE_OPTION;
 653           goto drop_packet;
 654         }
 655
 656       if ((u32)~0 == sw_if_index)
 657         {
 658           error0 = DHCPV6_PROXY_ERROR_NO_CIRCUIT_ID_OPTION;
 659           goto drop_packet;
 660         }
 661
 662       //Advance buffer to start of encapsulated DHCPv6 message
 663       vlib_buffer_advance (b0, sizeof(*r0));
 664
 665       client_fib_idx = im->mfib_index_by_sw_if_index[sw_if_index];
 666       proxy = dhcp_get_proxy(dm, client_fib_idx, FIB_PROTOCOL_IP6);
 667
 668       if (NULL == proxy)
 669       {
 670           error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 671           goto drop_packet;
 672       }
 673
 674       server_fib_idx = im->fib_index_by_sw_if_index
 675           [vnet_buffer(b0)->sw_if_index[VLIB_RX]];
 676
 677       vec_foreach(server, proxy->dhcp_servers)
 678       {
 679           if (server_fib_idx == server->server_fib_index &&
 680               ip0->src_address.as_u64[0] == server->dhcp_server.ip6.as_u64[0] &&
 681               ip0->src_address.as_u64[1] == server->dhcp_server.ip6.as_u64[1])
 682           {
 683               goto server_found;
 684           }
 685       }
 686
 687       //drop packet if not from server with configured address or FIB
 688       error0 = DHCPV6_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
 689       goto drop_packet;
 690
 691     server_found:
 692       vnet_buffer (b0)->sw_if_index[VLIB_TX] = original_sw_if_index
 693           = sw_if_index;
 694
 695       swif = vnet_get_sw_interface (vnm, original_sw_if_index);
 696       if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 697           sw_if_index = swif->unnumbered_sw_if_index;
 698
 699
 700       /*
 701        * udp_local hands us the DHCPV6 header, need udp hdr,
 702        * ip hdr to relay to client
 703        */
 704       vlib_buffer_advance (b0, -(sizeof(*u1)));
 705       u1 = vlib_buffer_get_current (b0);
 706
 707       vlib_buffer_advance (b0, -(sizeof(*ip1)));
 708       ip1 = vlib_buffer_get_current (b0);
 709
 710       copy_ip6_address(&client_address, &h0->peer_addr);
 711
 712       ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
 713       if (ia0 == 0)
 714         {
 715           error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 716           goto drop_packet;
 717         }
 718
 719       len =  clib_net_to_host_u16(r0->length);
 720       memset(ip1, 0, sizeof(*ip1));
 721       copy_ip6_address(&ip1->dst_address, &client_address);
 722       u1->checksum = 0;
 723       u1->src_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_server);
 724       u1->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_client);
 725       u1->length = clib_host_to_net_u16 (len + sizeof(udp_header_t));
 726
 727       ip1->ip_version_traffic_class_and_flow_label =
 728           ip0->ip_version_traffic_class_and_flow_label &
 729           0x00000fff;
 730       ip1->payload_length =  u1->length;
 731       ip1->protocol = PROTO_UDP;
 732       ip1->hop_limit = HOP_COUNT_LIMIT;
 733       copy_ip6_address(&ip1->src_address, ia0);
 734
 735       u1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, ip1,
 736                                                        &bogus_length);
 737       ASSERT(bogus_length == 0);
 738
 739       vlib_buffer_advance (b0, -(sizeof(ethernet_header_t)));
 740       si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
 741       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 742           vlib_buffer_advance (b0, -4 /* space for VLAN tag */);
 743
 744       mac0 = vlib_buffer_get_current (b0);
 745
 746       hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
 747       ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
 748       clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
 749       memset (&mac0->dst_address, 0xff, sizeof (mac0->dst_address));
 750       mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
 751         clib_net_to_host_u16(0x8100) : clib_net_to_host_u16 (0x86dd);
 752
 753       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 754         {
 755           u32 * vlan_tag = (u32 *)(mac0+1);
 756           u32 tmp;
 757           tmp = (si0->sub.id << 16) | 0x0800;
 758           *vlan_tag = clib_host_to_net_u32 (tmp);
 759         }
 760
 761       /* $$$ consider adding a dynamic next to the graph node, for performance */
 762       f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
 763       to_next0 = vlib_frame_vector_args (f0);
 764       to_next0[0] = bi0;
 765       f0->n_vectors = 1;
 766       vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
 767
 768     do_trace:
 769       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 770         {
 771           dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 772                                                      b0, sizeof (*tr));
 773           tr->which = 1; /* to client */
 774           if (ia0)
 775               copy_ip6_address((ip6_address_t*)tr->packet_data, ia0);
 776           tr->error = error0;
 777           tr->original_sw_if_index = original_sw_if_index;
 778           tr->sw_if_index = sw_if_index;
 779         }
 780     }
 781   return from_frame->n_vectors;
 782
 783 }
 784
 785 VLIB_REGISTER_NODE (dhcpv6_proxy_to_client_node, static) = {
 786   .function = dhcpv6_proxy_to_client_input,
 787   .name = "dhcpv6-proxy-to-client",
 788   /* Takes a vector of packets. */
 789   .vector_size = sizeof (u32),
 790
 791   .n_errors = DHCPV6_PROXY_N_ERROR,
 792   .error_strings = dhcpv6_proxy_error_strings,
 793   .format_buffer = format_dhcpv6_proxy_header_with_length,
 794   .format_trace = format_dhcpv6_proxy_trace,
 795 #if 0
 796   .unformat_buffer = unformat_dhcpv6_proxy_header,
 797 #endif
 798 };
 799
 800 static clib_error_t *
 801 dhcp6_proxy_init (vlib_main_t * vm)
 802 {
 803   dhcp_proxy_main_t * dm = &dhcp_proxy_main;
 804   vlib_node_t * error_drop_node;
 805
 806   error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
 807   dm->error_drop_node_index = error_drop_node->index;
 808
 809   /* RFC says this is the dhcpv6 server address  */
 810   all_dhcpv6_server_address.as_u64[0] = clib_host_to_net_u64 (0xFF05000000000000);
 811   all_dhcpv6_server_address.as_u64[1] = clib_host_to_net_u64 (0x00010003);
 812
 813   /* RFC says this is the server and agent address */
 814   all_dhcpv6_server_relay_agent_address.as_u64[0] = clib_host_to_net_u64 (0xFF02000000000000);
 815   all_dhcpv6_server_relay_agent_address.as_u64[1] = clib_host_to_net_u64 (0x00010002);
 816
 817   udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 818                          dhcpv6_proxy_to_client_node.index, 0 /* is_ip6 */);
 819
 820   udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
 821                          dhcpv6_proxy_to_server_node.index, 0 /* is_ip6 */);
 822
 823   return 0;
 824 }
 825
 826 VLIB_INIT_FUNCTION (dhcp6_proxy_init);
 827
 828 int
 829 dhcp6_proxy_set_server (ip46_address_t *addr,
 830                         ip46_address_t *src_addr,
 831                         u32 rx_table_id,
 832                         u32 server_table_id,
 833                         int is_del)
 834 {
 835   u32 rx_fib_index = 0;
 836   int rc = 0;
 837
 838   const mfib_prefix_t all_dhcp_servers = {
 839       .fp_len = 128,
 840       .fp_proto = FIB_PROTOCOL_IP6,
 841       .fp_grp_addr = {
 842           .ip6 = all_dhcpv6_server_relay_agent_address,
 843       }
 844   };
 845
 846   if (ip46_address_is_zero(addr))
 847     return VNET_API_ERROR_INVALID_DST_ADDRESS;
 848
 849   if (ip46_address_is_zero(src_addr))
 850     return VNET_API_ERROR_INVALID_SRC_ADDRESS;
 851
 852   rx_fib_index = mfib_table_find_or_create_and_lock(FIB_PROTOCOL_IP6,
 853                                                     rx_table_id,
 854                                                     MFIB_SOURCE_DHCP);
 855
 856   if (is_del)
 857     {
 858       if (dhcp_proxy_server_del (FIB_PROTOCOL_IP6, rx_fib_index,
 859                                  addr, server_table_id))
 860       {
 861           mfib_table_entry_delete(rx_fib_index,
 862                                   &all_dhcp_servers,
 863                                   MFIB_SOURCE_DHCP);
 864           mfib_table_unlock(rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 865       }
 866     }
 867   else
 868     {
 869      const fib_route_path_t path_for_us = {
 870           .frp_proto = DPO_PROTO_IP6,
 871           .frp_addr = zero_addr,
 872           .frp_sw_if_index = 0xffffffff,
 873           .frp_fib_index = ~0,
 874           .frp_weight = 0,
 875           .frp_flags = FIB_ROUTE_PATH_LOCAL,
 876       };
 877      if (dhcp_proxy_server_add (FIB_PROTOCOL_IP6, addr, src_addr,
 878                                 rx_fib_index, server_table_id))
 879      {
 880          mfib_table_entry_path_update(rx_fib_index,
 881                                       &all_dhcp_servers,
 882                                       MFIB_SOURCE_DHCP,
 883                                       &path_for_us,
 884                                       MFIB_ITF_FLAG_FORWARD);
 885          /*
 886           * Each interface that is enabled in this table, needs to be added
 887           * as an accepting interface, but this is not easily doable in VPP.
 888           * So we cheat. Add a flag to the entry that indicates accept form
 889           * any interface.
 890           * We will still only accept on v6 enabled interfaces, since the
 891           * input feature ensures this.
 892           */
 893          mfib_table_entry_update(rx_fib_index,
 894                                  &all_dhcp_servers,
 895                                  MFIB_SOURCE_DHCP,
 896                                  MFIB_RPF_ID_NONE,
 897                                  MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF);
 898          mfib_table_lock(rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 899      }
 900     }
 901
 902   mfib_table_unlock(rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 903
 904   return (rc);
 905 }
 906
 907 static clib_error_t *
 908 dhcpv6_proxy_set_command_fn (vlib_main_t * vm,
 909                            unformat_input_t * input,
 910                            vlib_cli_command_t * cmd)
 911 {
 912   ip46_address_t addr, src_addr;
 913   int set_server = 0, set_src_address = 0;
 914   u32 rx_table_id = 0, server_table_id = 0;
 915   int is_del = 0;
 916
 917   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
 918     {
 919       if (unformat (input, "server %U",
 920                     unformat_ip6_address, &addr.ip6))
 921          set_server = 1;
 922       else if (unformat(input, "src-address %U",
 923                         unformat_ip6_address, &src_addr.ip6))
 924           set_src_address =1;
 925        else if (unformat (input, "server-fib-id %d", &server_table_id))
 926         ;
 927        else if (unformat (input, "rx-fib-id %d", &rx_table_id))
 928          ;
 929        else if (unformat (input, "delete") ||
 930                 unformat (input, "del"))
 931            is_del = 1;
 932       else
 933         break;
 934     }
 935
 936   if (is_del || (set_server && set_src_address))
 937   {
 938       int rv;
 939
 940       rv = dhcp6_proxy_set_server (&addr, &src_addr, rx_table_id,
 941                                    server_table_id, is_del);
 942
 943       //TODO: Complete the errors
 944       switch (rv)
 945         {
 946         case 0:
 947           return 0;
 948
 949         case VNET_API_ERROR_INVALID_DST_ADDRESS:
 950           return clib_error_return (0, "Invalid server address");
 951
 952         case VNET_API_ERROR_INVALID_SRC_ADDRESS:
 953           return clib_error_return (0, "Invalid src address");
 954
 955         case VNET_API_ERROR_NO_SUCH_ENTRY:
 956           return clib_error_return
 957             (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
 958
 959         default:
 960           return clib_error_return (0, "BUG: rv %d", rv);
 961         }
 962   }
 963   else
 964     return clib_error_return (0, "parse error`%U'",
 965                               format_unformat_error, input);
 966 }
 967
 968 VLIB_CLI_COMMAND (dhcpv6_proxy_set_command, static) = {
 969   .path = "set dhcpv6 proxy",
 970   .short_help = "set dhcpv6 proxy [del] server <ipv6-addr> src-address <ipv6-addr> "
 971                   "[server-fib-id <fib-id>] [rx-fib-id <fib-id>] ",
 972   .function = dhcpv6_proxy_set_command_fn,
 973 };
 974
 975 static u8 *
 976 format_dhcp6_proxy_server (u8 * s, va_list * args)
 977 {
 978   dhcp_proxy_t * proxy = va_arg (*args, dhcp_proxy_t *);
 979   fib_table_t *server_fib;
 980   dhcp_server_t *server;
 981   ip6_mfib_t *rx_fib;
 982
 983   if (proxy == 0)
 984     {
 985         s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
 986                     "Servers FIB,Address");
 987       return s;
 988     }
 989
 990   rx_fib = ip6_mfib_get(proxy->rx_fib_index);
 991
 992   s = format (s, "%=14u%=16U",
 993               rx_fib->table_id,
 994               format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
 995
 996   vec_foreach(server, proxy->dhcp_servers)
 997   {
 998       server_fib = fib_table_get(server->server_fib_index,
 999                                  FIB_PROTOCOL_IP6);
1000       s = format (s, "%u,%U  ",
1001                   server_fib->ft_table_id,
1002                   format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
1003   }
1004
1005   return s;
1006 }
1007
1008 static int
1009 dhcp6_proxy_show_walk (dhcp_proxy_t *proxy,
1010                        void *ctx)
1011 {
1012     vlib_main_t * vm = ctx;
1013
1014     vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, proxy);
1015
1016     return (1);
1017 }
1018
1019 static clib_error_t *
1020 dhcpv6_proxy_show_command_fn (vlib_main_t * vm,
1021                               unformat_input_t * input,
1022                               vlib_cli_command_t * cmd)
1023 {
1024   vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, NULL /* header line */);
1025
1026   dhcp_proxy_walk(FIB_PROTOCOL_IP6, dhcp6_proxy_show_walk, vm);
1027
1028   return (NULL);
1029 }
1030
1031 VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = {
1032   .path = "show dhcpv6 proxy",
1033   .short_help = "Display dhcpv6 proxy info",
1034   .function = dhcpv6_proxy_show_command_fn,
1035 };
1036
1037 static clib_error_t *
1038 dhcpv6_vss_command_fn (vlib_main_t * vm,
1039                        unformat_input_t * input,
1040                        vlib_cli_command_t * cmd)
1041 {
1042   u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
1043   u8 *vpn_ascii_id = 0;
1044   u32 oui = 0, fib_id = 0, tbl_id = ~0;
1045
1046   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
1047     {
1048       if (unformat (input, "table %d", &tbl_id))
1049           ;
1050       else if (unformat (input, "oui %d", &oui))
1051           vss_type = VSS_TYPE_VPN_ID;
1052       else if (unformat (input, "vpn-id %d", &fib_id))
1053           vss_type = VSS_TYPE_VPN_ID;
1054       else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
1055           vss_type = VSS_TYPE_ASCII;
1056       else if (unformat(input, "delete") || unformat(input, "del"))
1057           is_del = 1;
1058       else
1059           break;
1060     }
1061
1062   if (tbl_id ==~0)
1063       return clib_error_return (0, "no table ID specified.");
1064
1065   int rv = dhcp_proxy_set_vss(FIB_PROTOCOL_IP6, tbl_id, vss_type,
1066                               vpn_ascii_id, oui, fib_id, is_del);
1067   switch (rv)
1068     {
1069     case 0:
1070         return 0;
1071     case VNET_API_ERROR_NO_SUCH_ENTRY:
1072         return clib_error_return (0, "vss for table %d not found in pool.",
1073                                   tbl_id);
1074     default:
1075         return clib_error_return (0, "BUG: rv %d", rv);
1076     }
1077 }
1078
1079 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_command, static) = {
1080   .path = "set dhcpv6 vss",
1081   .short_help = "set dhcpv6 vss table <table-id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
1082   .function = dhcpv6_vss_command_fn,
1083 };
1084
1085 static clib_error_t *
1086 dhcpv6_vss_show_command_fn (vlib_main_t * vm,
1087                             unformat_input_t * input,
1088                             vlib_cli_command_t * cmd)
1089
1090 {
1091   dhcp_vss_walk(FIB_PROTOCOL_IP6, dhcp_vss_show_walk, vm);
1092
1093   return (NULL);
1094 }
1095
1096 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_show_command, static) = {
1097   .path = "show dhcpv6 vss",
1098   .short_help = "show dhcpv6 VSS",
1099   .function = dhcpv6_vss_show_command_fn,
1100 };
1101
1102 static clib_error_t *
1103 dhcpv6_link_address_show_command_fn (vlib_main_t * vm,
1104                                 unformat_input_t * input,
1105                                 vlib_cli_command_t * cmd)
1106
1107 {
1108   vnet_main_t *vnm = vnet_get_main();
1109   u32 sw_if_index0=0, sw_if_index;
1110   vnet_sw_interface_t *swif;
1111   ip6_address_t *ia0;
1112
1113   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
1114     {
1115
1116       if (unformat(input, "%U",
1117                    unformat_vnet_sw_interface, vnm, &sw_if_index0))
1118         {
1119             swif = vnet_get_sw_interface (vnm, sw_if_index0);
1120             sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1121                 swif->unnumbered_sw_if_index : sw_if_index0;
1122             ia0 = ip6_interface_first_address(&ip6_main, sw_if_index);
1123             if (ia0)
1124               {
1125                   vlib_cli_output (vm, "%=20s%=48s", "interface", "link-address");
1126
1127                   vlib_cli_output (vm, "%=20U%=48U",
1128                                    format_vnet_sw_if_index_name, vnm, sw_if_index0,
1129                                    format_ip6_address, ia0);
1130               } else
1131                 vlib_cli_output (vm, "%=34s%=20U", "No IPv6 address configured on",
1132                                  format_vnet_sw_if_index_name, vnm, sw_if_index);
1133         } else
1134           break;
1135     }
1136
1137   return 0;
1138 }
1139
1140 VLIB_CLI_COMMAND (dhcpv6_proxy_address_show_command, static) = {
1141   .path = "show dhcpv6 link-address interface",
1142   .short_help = "show dhcpv6 link-address interface <interface>",
1143   .function = dhcpv6_link_address_show_command_fn,
1144 };