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 {
  40 #define _(s,n) DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s,
  41   foreach_dhcpv6_proxy_to_server_input_next
  42 #undef _
  43     DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
  44 } dhcpv6_proxy_to_server_input_next_t;
  45
  46 typedef struct
  47 {
  48   /* 0 => to server, 1 => to client */
  49   int which;
  50   u8 packet_data[64];
  51   u32 error;
  52   u32 sw_if_index;
  53   u32 original_sw_if_index;
  54 } dhcpv6_proxy_trace_t;
  55
  56 static vlib_node_registration_t dhcpv6_proxy_to_server_node;
  57 static vlib_node_registration_t dhcpv6_proxy_to_client_node;
  58
  59 /* all DHCP servers address */
  60 static ip6_address_t all_dhcpv6_server_address;
  61 static ip6_address_t all_dhcpv6_server_relay_agent_address;
  62
  63 static u8 *
  64 format_dhcpv6_proxy_trace (u8 * s, va_list * args)
  65 {
  66   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  67   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  68   dhcpv6_proxy_trace_t *t = va_arg (*args, dhcpv6_proxy_trace_t *);
  69
  70   if (t->which == 0)
  71     s = format (s, "DHCPV6 proxy: sent to server %U",
  72                 format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
  73   else
  74     s = format (s, "DHCPV6 proxy: sent to client from %U",
  75                 format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
  76   if (t->error != (u32) ~ 0)
  77     s = format (s, " error: %s\n", dhcpv6_proxy_error_strings[t->error]);
  78
  79   s = format (s, "  original_sw_if_index: %d, sw_if_index: %d\n",
  80               t->original_sw_if_index, t->sw_if_index);
  81
  82   return s;
  83 }
  84
  85 static u8 *
  86 format_dhcpv6_proxy_header_with_length (u8 * s, va_list * args)
  87 {
  88   dhcpv6_header_t *h = va_arg (*args, dhcpv6_header_t *);
  89   u32 max_header_bytes = va_arg (*args, u32);
  90   u32 header_bytes;
  91
  92   header_bytes = sizeof (h[0]);
  93   if (max_header_bytes != 0 && header_bytes > max_header_bytes)
  94     return format (s, "dhcpv6 header truncated");
  95
  96   s = format (s, "DHCPV6 Proxy");
  97
  98   return s;
  99 }
 100
 101 /* get first interface address */
 102 static ip6_address_t *
 103 ip6_interface_first_global_or_site_address (ip6_main_t * im, u32 sw_if_index)
 104 {
 105   ip_lookup_main_t *lm = &im->lookup_main;
 106   ip_interface_address_t *ia = 0;
 107   ip6_address_t *result = 0;
 108
 109   /* *INDENT-OFF* */
 110   foreach_ip_interface_address (lm, ia, sw_if_index,
 111                                 1 /* honor unnumbered */,
 112   ({
 113     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 114     if ((a->as_u8[0] & 0xe0) == 0x20 ||
 115         (a->as_u8[0] & 0xfe) == 0xfc)  {
 116         result = a;
 117         break;
 118     }
 119   }));
 120   /* *INDENT-ON* */
 121   return result;
 122 }
 123
 124 static inline void
 125 copy_ip6_address (ip6_address_t * dst, ip6_address_t * src)
 126 {
 127   dst->as_u64[0] = src->as_u64[0];
 128   dst->as_u64[1] = src->as_u64[1];
 129 }
 130
 131 static uword
 132 dhcpv6_proxy_to_server_input (vlib_main_t * vm,
 133                               vlib_node_runtime_t * node,
 134                               vlib_frame_t * from_frame)
 135 {
 136   u32 n_left_from, next_index, *from, *to_next;
 137   dhcp_proxy_main_t *dpm = &dhcp_proxy_main;
 138   from = vlib_frame_vector_args (from_frame);
 139   n_left_from = from_frame->n_vectors;
 140   u32 pkts_to_server = 0, pkts_to_client = 0, pkts_no_server = 0;
 141   u32 pkts_no_interface_address = 0, pkts_no_exceeding_max_hop = 0;
 142   u32 pkts_no_src_address = 0;
 143   u32 pkts_wrong_msg_type = 0;
 144   u32 pkts_too_big = 0;
 145   ip6_main_t *im = &ip6_main;
 146   ip6_address_t *src;
 147   int bogus_length;
 148   dhcp_proxy_t *proxy;
 149   dhcp_server_t *server;
 150   u32 rx_fib_idx = 0, server_fib_idx = 0;
 151
 152   next_index = node->cached_next_index;
 153
 154   while (n_left_from > 0)
 155     {
 156       u32 n_left_to_next;
 157
 158       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 159
 160       while (n_left_from > 0 && n_left_to_next > 0)
 161         {
 162           vnet_main_t *vnm = vnet_get_main ();
 163           u32 sw_if_index = 0;
 164           u32 rx_sw_if_index = 0;
 165           vnet_sw_interface_t *swif;
 166           u32 bi0;
 167           vlib_buffer_t *b0;
 168           udp_header_t *u0, *u1;
 169           dhcpv6_header_t *h0;  // client msg hdr
 170           ip6_header_t *ip0, *ip1;
 171           ip6_address_t _ia0, *ia0 = &_ia0;
 172           u32 next0;
 173           u32 error0 = (u32) ~ 0;
 174           dhcpv6_option_t *fwd_opt;
 175           dhcpv6_relay_hdr_t *r1;
 176           u16 len;
 177           dhcpv6_int_id_t *id1;
 178           dhcpv6_vss_t *vss1;
 179           dhcpv6_client_mac_t *cmac;    // client mac
 180           ethernet_header_t *e_h0;
 181           u8 client_src_mac[6];
 182           vlib_buffer_free_list_t *fl;
 183           dhcp_vss_t *vss;
 184           u8 is_solicit = 0;
 185
 186           bi0 = from[0];
 187           from += 1;
 188           n_left_from -= 1;
 189
 190           b0 = vlib_get_buffer (vm, bi0);
 191
 192           h0 = vlib_buffer_get_current (b0);
 193
 194           /*
 195            * udp_local hands us the DHCPV6 header.
 196            */
 197           u0 = (void *) h0 - (sizeof (*u0));
 198           ip0 = (void *) u0 - (sizeof (*ip0));
 199           e_h0 = (void *) ip0 - ethernet_buffer_header_size (b0);
 200
 201           clib_memcpy (client_src_mac, e_h0->src_address, 6);
 202
 203           switch (h0->msg_type)
 204             {
 205             case DHCPV6_MSG_SOLICIT:
 206             case DHCPV6_MSG_REQUEST:
 207             case DHCPV6_MSG_CONFIRM:
 208             case DHCPV6_MSG_RENEW:
 209             case DHCPV6_MSG_REBIND:
 210             case DHCPV6_MSG_RELEASE:
 211             case DHCPV6_MSG_DECLINE:
 212             case DHCPV6_MSG_INFORMATION_REQUEST:
 213             case DHCPV6_MSG_RELAY_FORW:
 214               /* send to server */
 215               break;
 216             case DHCPV6_MSG_RELAY_REPL:
 217               /* send to client */
 218               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
 219               error0 = 0;
 220               pkts_to_client++;
 221               goto do_enqueue;
 222             default:
 223               /* drop the packet */
 224               pkts_wrong_msg_type++;
 225               error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 226               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 227               goto do_trace;
 228
 229             }
 230
 231           /* Send to DHCPV6 server via the configured FIB */
 232           rx_sw_if_index = sw_if_index =
 233             vnet_buffer (b0)->sw_if_index[VLIB_RX];
 234           rx_fib_idx = im->mfib_index_by_sw_if_index[rx_sw_if_index];
 235           proxy = dhcp_get_proxy (dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
 236
 237           if (PREDICT_FALSE (NULL == proxy))
 238             {
 239               error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 240               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 241               pkts_no_server++;
 242               goto do_trace;
 243             }
 244
 245           server = &proxy->dhcp_servers[0];
 246           server_fib_idx = server->server_fib_index;
 247           vnet_buffer (b0)->sw_if_index[VLIB_TX] = server_fib_idx;
 248
 249
 250           /* relay-option header pointer */
 251           vlib_buffer_advance (b0, -(sizeof (*fwd_opt)));
 252           fwd_opt = vlib_buffer_get_current (b0);
 253           /* relay message header pointer */
 254           vlib_buffer_advance (b0, -(sizeof (*r1)));
 255           r1 = vlib_buffer_get_current (b0);
 256
 257           vlib_buffer_advance (b0, -(sizeof (*u1)));
 258           u1 = vlib_buffer_get_current (b0);
 259
 260           vlib_buffer_advance (b0, -(sizeof (*ip1)));
 261           ip1 = vlib_buffer_get_current (b0);
 262
 263           /* fill in all that rubbish... */
 264           len = clib_net_to_host_u16 (u0->length) - sizeof (udp_header_t);
 265           copy_ip6_address (&r1->peer_addr, &ip0->src_address);
 266
 267           r1->msg_type = DHCPV6_MSG_RELAY_FORW;
 268           fwd_opt->length = clib_host_to_net_u16 (len);
 269           fwd_opt->option = clib_host_to_net_u16 (DHCPV6_OPTION_RELAY_MSG);
 270
 271           r1->hop_count++;
 272           r1->hop_count =
 273             (h0->msg_type != DHCPV6_MSG_RELAY_FORW) ? 0 : r1->hop_count;
 274
 275           if (PREDICT_FALSE (r1->hop_count >= HOP_COUNT_LIMIT))
 276             {
 277               error0 = DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 278               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 279               pkts_no_exceeding_max_hop++;
 280               goto do_trace;
 281             }
 282
 283
 284           /* If relay-fwd and src address is site or global unicast address  */
 285           if (h0->msg_type == DHCPV6_MSG_RELAY_FORW &&
 286               ((ip0->src_address.as_u8[0] & 0xe0) == 0x20 ||
 287                (ip0->src_address.as_u8[0] & 0xfe) == 0xfc))
 288             {
 289               /* Set link address to zero */
 290               r1->link_addr.as_u64[0] = 0;
 291               r1->link_addr.as_u64[1] = 0;
 292               goto link_address_set;
 293             }
 294
 295           /* if receiving interface is unnumbered, use receiving interface
 296            * IP address as link address, otherwise use the loopback interface
 297            * IP address as link address.
 298            */
 299
 300           swif = vnet_get_sw_interface (vnm, rx_sw_if_index);
 301           if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 302             sw_if_index = swif->unnumbered_sw_if_index;
 303
 304           ia0 =
 305             ip6_interface_first_global_or_site_address (&ip6_main,
 306                                                         sw_if_index);
 307           if (ia0 == 0)
 308             {
 309               error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 310               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 311               pkts_no_interface_address++;
 312               goto do_trace;
 313             }
 314
 315           copy_ip6_address (&r1->link_addr, ia0);
 316
 317         link_address_set:
 318           fl = vlib_buffer_get_free_list
 319             (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
 320
 321           if ((b0->current_length + sizeof (*id1) + sizeof (*vss1) +
 322                sizeof (*cmac)) > fl->n_data_bytes)
 323             {
 324               error0 = DHCPV6_PROXY_ERROR_PKT_TOO_BIG;
 325               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 326               pkts_too_big++;
 327               goto do_trace;
 328             }
 329
 330           id1 = (dhcpv6_int_id_t *) (((uword) ip1) + b0->current_length);
 331           b0->current_length += (sizeof (*id1));
 332
 333           id1->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_INTERFACE_ID);
 334           id1->opt.length = clib_host_to_net_u16 (sizeof (rx_sw_if_index));
 335           id1->int_idx = clib_host_to_net_u32 (rx_sw_if_index);
 336
 337           u1->length = 0;
 338           if (h0->msg_type != DHCPV6_MSG_RELAY_FORW)
 339             {
 340               cmac =
 341                 (dhcpv6_client_mac_t *) (((uword) ip1) + b0->current_length);
 342               b0->current_length += (sizeof (*cmac));
 343               cmac->opt.length = clib_host_to_net_u16 (sizeof (*cmac) -
 344                                                        sizeof (cmac->opt));
 345               cmac->opt.option =
 346                 clib_host_to_net_u16
 347                 (DHCPV6_OPTION_CLIENT_LINK_LAYER_ADDRESS);
 348               cmac->link_type = clib_host_to_net_u16 (1);       /* ethernet */
 349               clib_memcpy (cmac->data, client_src_mac, 6);
 350               u1->length += sizeof (*cmac);
 351             }
 352
 353           vss = dhcp_get_vss_info (dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
 354
 355           if (vss)
 356             {
 357               u16 id_len;       /* length of VPN ID */
 358               u16 type_len = sizeof (vss1->vss_type);
 359
 360               vss1 = (dhcpv6_vss_t *) (((uword) ip1) + b0->current_length);
 361               vss1->vss_type = vss->vss_type;
 362               if (vss->vss_type == VSS_TYPE_VPN_ID)
 363                 {
 364                   id_len = sizeof (vss->vpn_id);        /* vpn_id is 7 bytes */
 365                   memcpy (vss1->data, vss->vpn_id, id_len);
 366                 }
 367               else if (vss->vss_type == VSS_TYPE_ASCII)
 368                 {
 369                   id_len = vec_len (vss->vpn_ascii_id);
 370                   memcpy (vss1->data, vss->vpn_ascii_id, id_len);
 371                 }
 372               else              /* must be VSS_TYPE_DEFAULT, no VPN ID */
 373                 id_len = 0;
 374
 375               vss1->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_VSS);
 376               vss1->opt.length = clib_host_to_net_u16 (type_len + id_len);
 377               u1->length += type_len + id_len + sizeof (vss1->opt);
 378               b0->current_length += type_len + id_len + sizeof (vss1->opt);
 379             }
 380
 381           pkts_to_server++;
 382           u1->checksum = 0;
 383           u1->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcpv6_to_client);
 384           u1->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcpv6_to_server);
 385
 386           u1->length =
 387             clib_host_to_net_u16 (clib_net_to_host_u16 (fwd_opt->length) +
 388                                   sizeof (*r1) + sizeof (*fwd_opt) +
 389                                   sizeof (*u1) + sizeof (*id1) + u1->length);
 390
 391           clib_memset (ip1, 0, sizeof (*ip1));
 392           ip1->ip_version_traffic_class_and_flow_label = 0x60;
 393           ip1->payload_length = u1->length;
 394           ip1->protocol = PROTO_UDP;
 395           ip1->hop_limit = HOP_COUNT_LIMIT;
 396           src = ((server->dhcp_server.ip6.as_u64[0] ||
 397                   server->dhcp_server.ip6.as_u64[1]) ?
 398                  &server->dhcp_server.ip6 : &all_dhcpv6_server_address);
 399           copy_ip6_address (&ip1->dst_address, src);
 400
 401
 402           ia0 = ip6_interface_first_global_or_site_address
 403             (&ip6_main, vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 404
 405           src = (proxy->dhcp_src_address.ip6.as_u64[0] ||
 406                  proxy->dhcp_src_address.ip6.as_u64[1]) ?
 407             &proxy->dhcp_src_address.ip6 : ia0;
 408           if (ia0 == 0)
 409             {
 410               error0 = DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS;
 411               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 412               pkts_no_src_address++;
 413               goto do_trace;
 414             }
 415
 416           copy_ip6_address (&ip1->src_address, src);
 417
 418
 419           u1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip1,
 420                                                             &bogus_length);
 421           ASSERT (bogus_length == 0);
 422
 423           next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
 424
 425           is_solicit = (DHCPV6_MSG_SOLICIT == h0->msg_type);
 426
 427           /*
 428            * If we have multiple servers configured and this is the
 429            * client's discover message, then send copies to each of
 430            * those servers
 431            */
 432           if (is_solicit && vec_len (proxy->dhcp_servers) > 1)
 433             {
 434               u32 ii;
 435
 436               for (ii = 1; ii < vec_len (proxy->dhcp_servers); ii++)
 437                 {
 438                   vlib_buffer_t *c0;
 439                   u32 ci0;
 440
 441                   c0 = vlib_buffer_copy (vm, b0);
 442                   vlib_buffer_copy_trace_flag (vm, c0, bi0);
 443                   VLIB_BUFFER_TRACE_TRAJECTORY_INIT (c0);
 444                   ci0 = vlib_get_buffer_index (vm, c0);
 445                   server = &proxy->dhcp_servers[ii];
 446
 447                   ip0 = vlib_buffer_get_current (c0);
 448
 449                   src = ((server->dhcp_server.ip6.as_u64[0] ||
 450                           server->dhcp_server.ip6.as_u64[1]) ?
 451                          &server->dhcp_server.ip6 :
 452                          &all_dhcpv6_server_address);
 453                   copy_ip6_address (&ip1->dst_address, src);
 454
 455                   to_next[0] = ci0;
 456                   to_next += 1;
 457                   n_left_to_next -= 1;
 458
 459                   vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 460                                                    to_next, n_left_to_next,
 461                                                    ci0, next0);
 462
 463                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 464                     {
 465                       dhcpv6_proxy_trace_t *tr;
 466
 467                       tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
 468                       tr->which = 0;    /* to server */
 469                       tr->error = error0;
 470                       tr->original_sw_if_index = rx_sw_if_index;
 471                       tr->sw_if_index = sw_if_index;
 472                       if (next0 == DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
 473                         copy_ip6_address ((ip6_address_t *) &
 474                                           tr->packet_data[0],
 475                                           &server->dhcp_server.ip6);
 476                     }
 477
 478                   if (PREDICT_FALSE (0 == n_left_to_next))
 479                     {
 480                       vlib_put_next_frame (vm, node, next_index,
 481                                            n_left_to_next);
 482                       vlib_get_next_frame (vm, node, next_index,
 483                                            to_next, n_left_to_next);
 484                     }
 485                 }
 486             }
 487
 488         do_trace:
 489           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 490             {
 491               dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 492                                                          b0, sizeof (*tr));
 493               tr->which = 0;    /* to server */
 494               tr->error = error0;
 495               tr->original_sw_if_index = rx_sw_if_index;
 496               tr->sw_if_index = sw_if_index;
 497               if (DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP == next0)
 498                 copy_ip6_address ((ip6_address_t *) & tr->packet_data[0],
 499                                   &server->dhcp_server.ip6);
 500             }
 501
 502         do_enqueue:
 503           to_next[0] = bi0;
 504           to_next += 1;
 505           n_left_to_next -= 1;
 506
 507           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 508                                            to_next, n_left_to_next,
 509                                            bi0, next0);
 510         }
 511
 512       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 513     }
 514
 515   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 516                                DHCPV6_PROXY_ERROR_RELAY_TO_CLIENT,
 517                                pkts_to_client);
 518   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 519                                DHCPV6_PROXY_ERROR_RELAY_TO_SERVER,
 520                                pkts_to_server);
 521   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 522                                DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS,
 523                                pkts_no_interface_address);
 524   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 525                                DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE,
 526                                pkts_wrong_msg_type);
 527   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 528                                DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS,
 529                                pkts_no_src_address);
 530   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 531                                DHCPV6_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
 532   return from_frame->n_vectors;
 533 }
 534
 535 /* *INDENT-OFF* */
 536 VLIB_REGISTER_NODE (dhcpv6_proxy_to_server_node, static) = {
 537   .function = dhcpv6_proxy_to_server_input,
 538   .name = "dhcpv6-proxy-to-server",
 539   /* Takes a vector of packets. */
 540   .vector_size = sizeof (u32),
 541
 542   .n_errors = DHCPV6_PROXY_N_ERROR,
 543   .error_strings = dhcpv6_proxy_error_strings,
 544
 545   .n_next_nodes = DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
 546   .next_nodes = {
 547 #define _(s,n) [DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
 548     foreach_dhcpv6_proxy_to_server_input_next
 549 #undef _
 550   },
 551
 552   .format_buffer = format_dhcpv6_proxy_header_with_length,
 553   .format_trace = format_dhcpv6_proxy_trace,
 554 #if 0
 555   .unformat_buffer = unformat_dhcpv6_proxy_header,
 556 #endif
 557 };
 558 /* *INDENT-ON* */
 559
 560 static uword
 561 dhcpv6_proxy_to_client_input (vlib_main_t * vm,
 562                               vlib_node_runtime_t * node,
 563                               vlib_frame_t * from_frame)
 564 {
 565
 566   u32 n_left_from, *from;
 567   ethernet_main_t *em = vnet_get_ethernet_main ();
 568   dhcp_proxy_main_t *dm = &dhcp_proxy_main;
 569   dhcp_proxy_t *proxy;
 570   dhcp_server_t *server;
 571   vnet_main_t *vnm = vnet_get_main ();
 572   int bogus_length;
 573
 574   from = vlib_frame_vector_args (from_frame);
 575   n_left_from = from_frame->n_vectors;
 576
 577   while (n_left_from > 0)
 578     {
 579       u32 bi0;
 580       vlib_buffer_t *b0;
 581       udp_header_t *u0, *u1 = 0;
 582       dhcpv6_relay_hdr_t *h0;
 583       ip6_header_t *ip1 = 0, *ip0;
 584       ip6_address_t _ia0, *ia0 = &_ia0;
 585       ip6_address_t client_address;
 586       ethernet_interface_t *ei0;
 587       ethernet_header_t *mac0;
 588       vnet_hw_interface_t *hi0;
 589       vlib_frame_t *f0;
 590       u32 *to_next0;
 591       u32 sw_if_index = ~0;
 592       u32 original_sw_if_index = ~0;
 593       vnet_sw_interface_t *si0;
 594       u32 error0 = (u32) ~ 0;
 595       vnet_sw_interface_t *swif;
 596       dhcpv6_option_t *r0 = 0, *o;
 597       u16 len = 0;
 598       u8 interface_opt_flag = 0;
 599       u8 relay_msg_opt_flag = 0;
 600       ip6_main_t *im = &ip6_main;
 601       u32 server_fib_idx, client_fib_idx;
 602
 603       bi0 = from[0];
 604       from += 1;
 605       n_left_from -= 1;
 606
 607       b0 = vlib_get_buffer (vm, bi0);
 608       h0 = vlib_buffer_get_current (b0);
 609
 610       if (DHCPV6_MSG_RELAY_REPL != h0->msg_type)
 611         {
 612           error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 613
 614         drop_packet:
 615           vlib_node_increment_counter (vm, dhcpv6_proxy_to_client_node.index,
 616                                        error0, 1);
 617
 618           f0 = vlib_get_frame_to_node (vm, dm->error_drop_node_index);
 619           to_next0 = vlib_frame_vector_args (f0);
 620           to_next0[0] = bi0;
 621           f0->n_vectors = 1;
 622           vlib_put_frame_to_node (vm, dm->error_drop_node_index, f0);
 623           goto do_trace;
 624         }
 625       /* hop count seems not need to be checked */
 626       if (HOP_COUNT_LIMIT < h0->hop_count)
 627         {
 628           error0 = DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 629           goto drop_packet;
 630         }
 631       u0 = (void *) h0 - (sizeof (*u0));
 632       ip0 = (void *) u0 - (sizeof (*ip0));
 633
 634       vlib_buffer_advance (b0, sizeof (*h0));
 635       o = vlib_buffer_get_current (b0);
 636
 637       /* Parse through TLVs looking for option 18 (DHCPV6_OPTION_INTERFACE_ID)
 638          _and_ option 9 (DHCPV6_OPTION_RELAY_MSG) option which must be there.
 639          Currently assuming no other options need to be processed
 640          The interface-ID is the FIB number we need
 641          to track down the client-facing interface */
 642
 643       while ((u8 *) o < (b0->data + b0->current_data + b0->current_length))
 644         {
 645           if (DHCPV6_OPTION_INTERFACE_ID == clib_net_to_host_u16 (o->option))
 646             {
 647               interface_opt_flag = 1;
 648               if (clib_net_to_host_u16 (o->length) == sizeof (sw_if_index))
 649                 sw_if_index =
 650                   clib_net_to_host_u32 (((dhcpv6_int_id_t *) o)->int_idx);
 651               if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
 652                 {
 653                   error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION;
 654                   goto drop_packet;
 655                 }
 656             }
 657           if (DHCPV6_OPTION_RELAY_MSG == clib_net_to_host_u16 (o->option))
 658             {
 659               relay_msg_opt_flag = 1;
 660               r0 = vlib_buffer_get_current (b0);
 661             }
 662           if ((relay_msg_opt_flag == 1) && (interface_opt_flag == 1))
 663             break;
 664           vlib_buffer_advance (b0,
 665                                sizeof (*o) +
 666                                clib_net_to_host_u16 (o->length));
 667           o =
 668             (dhcpv6_option_t *) (((uword) o) +
 669                                  clib_net_to_host_u16 (o->length) +
 670                                  sizeof (*o));
 671         }
 672
 673       if ((relay_msg_opt_flag == 0) || (r0 == 0))
 674         {
 675           error0 = DHCPV6_PROXY_ERROR_NO_RELAY_MESSAGE_OPTION;
 676           goto drop_packet;
 677         }
 678
 679       if ((u32) ~ 0 == sw_if_index)
 680         {
 681           error0 = DHCPV6_PROXY_ERROR_NO_CIRCUIT_ID_OPTION;
 682           goto drop_packet;
 683         }
 684
 685       //Advance buffer to start of encapsulated DHCPv6 message
 686       vlib_buffer_advance (b0, sizeof (*r0));
 687
 688       client_fib_idx = im->mfib_index_by_sw_if_index[sw_if_index];
 689       proxy = dhcp_get_proxy (dm, client_fib_idx, FIB_PROTOCOL_IP6);
 690
 691       if (NULL == proxy)
 692         {
 693           error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 694           goto drop_packet;
 695         }
 696
 697       server_fib_idx = im->fib_index_by_sw_if_index
 698         [vnet_buffer (b0)->sw_if_index[VLIB_RX]];
 699
 700       vec_foreach (server, proxy->dhcp_servers)
 701       {
 702         if (server_fib_idx == server->server_fib_index &&
 703             ip0->src_address.as_u64[0] == server->dhcp_server.ip6.as_u64[0] &&
 704             ip0->src_address.as_u64[1] == server->dhcp_server.ip6.as_u64[1])
 705           {
 706             goto server_found;
 707           }
 708       }
 709
 710       //drop packet if not from server with configured address or FIB
 711       error0 = DHCPV6_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
 712       goto drop_packet;
 713
 714     server_found:
 715       vnet_buffer (b0)->sw_if_index[VLIB_TX] = original_sw_if_index
 716         = sw_if_index;
 717
 718       swif = vnet_get_sw_interface (vnm, original_sw_if_index);
 719       if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 720         sw_if_index = swif->unnumbered_sw_if_index;
 721
 722
 723       /*
 724        * udp_local hands us the DHCPV6 header, need udp hdr,
 725        * ip hdr to relay to client
 726        */
 727       vlib_buffer_advance (b0, -(sizeof (*u1)));
 728       u1 = vlib_buffer_get_current (b0);
 729
 730       vlib_buffer_advance (b0, -(sizeof (*ip1)));
 731       ip1 = vlib_buffer_get_current (b0);
 732
 733       copy_ip6_address (&client_address, &h0->peer_addr);
 734
 735       ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
 736       if (ia0 == 0)
 737         {
 738           error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 739           goto drop_packet;
 740         }
 741
 742       len = clib_net_to_host_u16 (r0->length);
 743       clib_memset (ip1, 0, sizeof (*ip1));
 744       copy_ip6_address (&ip1->dst_address, &client_address);
 745       u1->checksum = 0;
 746       u1->src_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_server);
 747       u1->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_client);
 748       u1->length = clib_host_to_net_u16 (len + sizeof (udp_header_t));
 749
 750       ip1->ip_version_traffic_class_and_flow_label =
 751         ip0->ip_version_traffic_class_and_flow_label & 0x00000fff;
 752       ip1->payload_length = u1->length;
 753       ip1->protocol = PROTO_UDP;
 754       ip1->hop_limit = HOP_COUNT_LIMIT;
 755       copy_ip6_address (&ip1->src_address, ia0);
 756
 757       u1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip1,
 758                                                         &bogus_length);
 759       ASSERT (bogus_length == 0);
 760
 761       vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
 762       si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
 763       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 764         vlib_buffer_advance (b0, -4 /* space for VLAN tag */ );
 765
 766       mac0 = vlib_buffer_get_current (b0);
 767
 768       hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
 769       ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
 770       clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
 771       clib_memset (&mac0->dst_address, 0xff, sizeof (mac0->dst_address));
 772       mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
 773         clib_net_to_host_u16 (0x8100) : clib_net_to_host_u16 (0x86dd);
 774
 775       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 776         {
 777           u32 *vlan_tag = (u32 *) (mac0 + 1);
 778           u32 tmp;
 779           tmp = (si0->sub.id << 16) | 0x0800;
 780           *vlan_tag = clib_host_to_net_u32 (tmp);
 781         }
 782
 783       /* $$$ consider adding a dynamic next to the graph node, for performance */
 784       f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
 785       to_next0 = vlib_frame_vector_args (f0);
 786       to_next0[0] = bi0;
 787       f0->n_vectors = 1;
 788       vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
 789
 790     do_trace:
 791       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 792         {
 793           dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 794                                                      b0, sizeof (*tr));
 795           tr->which = 1;        /* to client */
 796           if (ia0)
 797             copy_ip6_address ((ip6_address_t *) tr->packet_data, ia0);
 798           tr->error = error0;
 799           tr->original_sw_if_index = original_sw_if_index;
 800           tr->sw_if_index = sw_if_index;
 801         }
 802     }
 803   return from_frame->n_vectors;
 804
 805 }
 806
 807 /* *INDENT-OFF* */
 808 VLIB_REGISTER_NODE (dhcpv6_proxy_to_client_node, static) = {
 809   .function = dhcpv6_proxy_to_client_input,
 810   .name = "dhcpv6-proxy-to-client",
 811   /* Takes a vector of packets. */
 812   .vector_size = sizeof (u32),
 813
 814   .n_errors = DHCPV6_PROXY_N_ERROR,
 815   .error_strings = dhcpv6_proxy_error_strings,
 816   .format_buffer = format_dhcpv6_proxy_header_with_length,
 817   .format_trace = format_dhcpv6_proxy_trace,
 818 #if 0
 819   .unformat_buffer = unformat_dhcpv6_proxy_header,
 820 #endif
 821 };
 822 /* *INDENT-ON* */
 823
 824 static clib_error_t *
 825 dhcp6_proxy_init (vlib_main_t * vm)
 826 {
 827   dhcp_proxy_main_t *dm = &dhcp_proxy_main;
 828   vlib_node_t *error_drop_node;
 829
 830   error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
 831   dm->error_drop_node_index = error_drop_node->index;
 832
 833   /* RFC says this is the dhcpv6 server address  */
 834   all_dhcpv6_server_address.as_u64[0] =
 835     clib_host_to_net_u64 (0xFF05000000000000);
 836   all_dhcpv6_server_address.as_u64[1] = clib_host_to_net_u64 (0x00010003);
 837
 838   /* RFC says this is the server and agent address */
 839   all_dhcpv6_server_relay_agent_address.as_u64[0] =
 840     clib_host_to_net_u64 (0xFF02000000000000);
 841   all_dhcpv6_server_relay_agent_address.as_u64[1] =
 842     clib_host_to_net_u64 (0x00010002);
 843
 844   return 0;
 845 }
 846
 847 VLIB_INIT_FUNCTION (dhcp6_proxy_init);
 848
 849 int
 850 dhcp6_proxy_set_server (ip46_address_t * addr,
 851                         ip46_address_t * src_addr,
 852                         u32 rx_table_id, u32 server_table_id, int is_del)
 853 {
 854   vlib_main_t *vm = vlib_get_main ();
 855   u32 rx_fib_index = 0;
 856   int rc = 0;
 857
 858   const mfib_prefix_t all_dhcp_servers = {
 859     .fp_len = 128,
 860     .fp_proto = FIB_PROTOCOL_IP6,
 861     .fp_grp_addr = {
 862                     .ip6 = all_dhcpv6_server_relay_agent_address,
 863                     }
 864   };
 865
 866   if (ip46_address_is_zero (addr))
 867     return VNET_API_ERROR_INVALID_DST_ADDRESS;
 868
 869   if (ip46_address_is_zero (src_addr))
 870     return VNET_API_ERROR_INVALID_SRC_ADDRESS;
 871
 872   rx_fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6,
 873                                                      rx_table_id,
 874                                                      MFIB_SOURCE_DHCP);
 875
 876   if (is_del)
 877     {
 878       if (dhcp_proxy_server_del (FIB_PROTOCOL_IP6, rx_fib_index,
 879                                  addr, server_table_id))
 880         {
 881           mfib_table_entry_delete (rx_fib_index,
 882                                    &all_dhcp_servers, MFIB_SOURCE_DHCP);
 883           mfib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP6,
 884                              MFIB_SOURCE_DHCP);
 885
 886           udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 887                                    0 /* is_ip6 */ );
 888           udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
 889                                    0 /* is_ip6 */ );
 890         }
 891     }
 892   else
 893     {
 894       const fib_route_path_t path_for_us = {
 895         .frp_proto = DPO_PROTO_IP6,
 896         .frp_addr = zero_addr,
 897         .frp_sw_if_index = 0xffffffff,
 898         .frp_fib_index = ~0,
 899         .frp_weight = 0,
 900         .frp_flags = FIB_ROUTE_PATH_LOCAL,
 901       };
 902       if (dhcp_proxy_server_add (FIB_PROTOCOL_IP6, addr, src_addr,
 903                                  rx_fib_index, server_table_id))
 904         {
 905           mfib_table_entry_path_update (rx_fib_index,
 906                                         &all_dhcp_servers,
 907                                         MFIB_SOURCE_DHCP,
 908                                         &path_for_us, MFIB_ITF_FLAG_FORWARD);
 909           /*
 910            * Each interface that is enabled in this table, needs to be added
 911            * as an accepting interface, but this is not easily doable in VPP.
 912            * So we cheat. Add a flag to the entry that indicates accept form
 913            * any interface.
 914            * We will still only accept on v6 enabled interfaces, since the
 915            * input feature ensures this.
 916            */
 917           mfib_table_entry_update (rx_fib_index,
 918                                    &all_dhcp_servers,
 919                                    MFIB_SOURCE_DHCP,
 920                                    MFIB_RPF_ID_NONE,
 921                                    MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF);
 922           mfib_table_lock (rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 923
 924           udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 925                                  dhcpv6_proxy_to_client_node.index,
 926                                  0 /* is_ip6 */ );
 927           udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
 928                                  dhcpv6_proxy_to_server_node.index,
 929                                  0 /* is_ip6 */ );
 930         }
 931     }
 932
 933   mfib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 934
 935   return (rc);
 936 }
 937
 938 static clib_error_t *
 939 dhcpv6_proxy_set_command_fn (vlib_main_t * vm,
 940                              unformat_input_t * input,
 941                              vlib_cli_command_t * cmd)
 942 {
 943   ip46_address_t addr, src_addr;
 944   int set_server = 0, set_src_address = 0;
 945   u32 rx_table_id = 0, server_table_id = 0;
 946   int is_del = 0;
 947
 948   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 949     {
 950       if (unformat (input, "server %U", unformat_ip6_address, &addr.ip6))
 951         set_server = 1;
 952       else if (unformat (input, "src-address %U",
 953                          unformat_ip6_address, &src_addr.ip6))
 954         set_src_address = 1;
 955       else if (unformat (input, "server-fib-id %d", &server_table_id))
 956         ;
 957       else if (unformat (input, "rx-fib-id %d", &rx_table_id))
 958         ;
 959       else if (unformat (input, "delete") || unformat (input, "del"))
 960         is_del = 1;
 961       else
 962         break;
 963     }
 964
 965   if (is_del || (set_server && set_src_address))
 966     {
 967       int rv;
 968
 969       rv = dhcp6_proxy_set_server (&addr, &src_addr, rx_table_id,
 970                                    server_table_id, is_del);
 971
 972       //TODO: Complete the errors
 973       switch (rv)
 974         {
 975         case 0:
 976           return 0;
 977
 978         case VNET_API_ERROR_INVALID_DST_ADDRESS:
 979           return clib_error_return (0, "Invalid server address");
 980
 981         case VNET_API_ERROR_INVALID_SRC_ADDRESS:
 982           return clib_error_return (0, "Invalid src address");
 983
 984         case VNET_API_ERROR_NO_SUCH_ENTRY:
 985           return clib_error_return
 986             (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
 987
 988         default:
 989           return clib_error_return (0, "BUG: rv %d", rv);
 990         }
 991     }
 992   else
 993     return clib_error_return (0, "parse error`%U'",
 994                               format_unformat_error, input);
 995 }
 996
 997 /* *INDENT-OFF* */
 998 VLIB_CLI_COMMAND (dhcpv6_proxy_set_command, static) = {
 999   .path = "set dhcpv6 proxy",
1000   .short_help = "set dhcpv6 proxy [del] server <ipv6-addr> src-address <ipv6-addr> "
1001                   "[server-fib-id <fib-id>] [rx-fib-id <fib-id>] ",
1002   .function = dhcpv6_proxy_set_command_fn,
1003 };
1004 /* *INDENT-ON* */
1005
1006 static u8 *
1007 format_dhcp6_proxy_server (u8 * s, va_list * args)
1008 {
1009   dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
1010   fib_table_t *server_fib;
1011   dhcp_server_t *server;
1012   ip6_mfib_t *rx_fib;
1013
1014   if (proxy == 0)
1015     {
1016       s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
1017                   "Servers FIB,Address");
1018       return s;
1019     }
1020
1021   rx_fib = ip6_mfib_get (proxy->rx_fib_index);
1022
1023   s = format (s, "%=14u%=16U",
1024               rx_fib->table_id,
1025               format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
1026
1027   vec_foreach (server, proxy->dhcp_servers)
1028   {
1029     server_fib = fib_table_get (server->server_fib_index, FIB_PROTOCOL_IP6);
1030     s = format (s, "%u,%U  ",
1031                 server_fib->ft_table_id,
1032                 format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
1033   }
1034
1035   return s;
1036 }
1037
1038 static int
1039 dhcp6_proxy_show_walk (dhcp_proxy_t * proxy, void *ctx)
1040 {
1041   vlib_main_t *vm = ctx;
1042
1043   vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, proxy);
1044
1045   return (1);
1046 }
1047
1048 static clib_error_t *
1049 dhcpv6_proxy_show_command_fn (vlib_main_t * vm,
1050                               unformat_input_t * input,
1051                               vlib_cli_command_t * cmd)
1052 {
1053   vlib_cli_output (vm, "%U", format_dhcp6_proxy_server,
1054                    NULL /* header line */ );
1055
1056   dhcp_proxy_walk (FIB_PROTOCOL_IP6, dhcp6_proxy_show_walk, vm);
1057
1058   return (NULL);
1059 }
1060
1061 /* *INDENT-OFF* */
1062 VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = {
1063   .path = "show dhcpv6 proxy",
1064   .short_help = "Display dhcpv6 proxy info",
1065   .function = dhcpv6_proxy_show_command_fn,
1066 };
1067 /* *INDENT-ON* */
1068
1069 static clib_error_t *
1070 dhcpv6_vss_command_fn (vlib_main_t * vm,
1071                        unformat_input_t * input, vlib_cli_command_t * cmd)
1072 {
1073   u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
1074   u8 *vpn_ascii_id = 0;
1075   u32 oui = 0, fib_id = 0, tbl_id = ~0;
1076
1077   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1078     {
1079       if (unformat (input, "table %d", &tbl_id))
1080         ;
1081       else if (unformat (input, "oui %d", &oui))
1082         vss_type = VSS_TYPE_VPN_ID;
1083       else if (unformat (input, "vpn-id %d", &fib_id))
1084         vss_type = VSS_TYPE_VPN_ID;
1085       else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
1086         vss_type = VSS_TYPE_ASCII;
1087       else if (unformat (input, "delete") || unformat (input, "del"))
1088         is_del = 1;
1089       else
1090         break;
1091     }
1092
1093   if (tbl_id == ~0)
1094     return clib_error_return (0, "no table ID specified.");
1095
1096   int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP6, tbl_id, vss_type,
1097                                vpn_ascii_id, oui, fib_id, is_del);
1098   switch (rv)
1099     {
1100     case 0:
1101       return 0;
1102     case VNET_API_ERROR_NO_SUCH_ENTRY:
1103       return clib_error_return (0, "vss for table %d not found in pool.",
1104                                 tbl_id);
1105     default:
1106       return clib_error_return (0, "BUG: rv %d", rv);
1107     }
1108 }
1109
1110 /* *INDENT-OFF* */
1111 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_command, static) = {
1112   .path = "set dhcpv6 vss",
1113   .short_help = "set dhcpv6 vss table <table-id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
1114   .function = dhcpv6_vss_command_fn,
1115 };
1116 /* *INDENT-ON* */
1117
1118 static clib_error_t *
1119 dhcpv6_vss_show_command_fn (vlib_main_t * vm,
1120                             unformat_input_t * input,
1121                             vlib_cli_command_t * cmd)
1122 {
1123   dhcp_vss_walk (FIB_PROTOCOL_IP6, dhcp_vss_show_walk, vm);
1124
1125   return (NULL);
1126 }
1127
1128 /* *INDENT-OFF* */
1129 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_show_command, static) = {
1130   .path = "show dhcpv6 vss",
1131   .short_help = "show dhcpv6 VSS",
1132   .function = dhcpv6_vss_show_command_fn,
1133 };
1134 /* *INDENT-ON* */
1135
1136 static clib_error_t *
1137 dhcpv6_link_address_show_command_fn (vlib_main_t * vm,
1138                                      unformat_input_t * input,
1139                                      vlib_cli_command_t * cmd)
1140 {
1141   vnet_main_t *vnm = vnet_get_main ();
1142   u32 sw_if_index0 = 0, sw_if_index;
1143   vnet_sw_interface_t *swif;
1144   ip6_address_t *ia0;
1145
1146   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1147     {
1148
1149       if (unformat (input, "%U",
1150                     unformat_vnet_sw_interface, vnm, &sw_if_index0))
1151         {
1152           swif = vnet_get_sw_interface (vnm, sw_if_index0);
1153           sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1154             swif->unnumbered_sw_if_index : sw_if_index0;
1155           ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
1156           if (ia0)
1157             {
1158               vlib_cli_output (vm, "%=20s%=48s", "interface", "link-address");
1159
1160               vlib_cli_output (vm, "%=20U%=48U",
1161                                format_vnet_sw_if_index_name, vnm,
1162                                sw_if_index0, format_ip6_address, ia0);
1163             }
1164           else
1165             vlib_cli_output (vm, "%=34s%=20U",
1166                              "No IPv6 address configured on",
1167                              format_vnet_sw_if_index_name, vnm, sw_if_index);
1168         }
1169       else
1170         break;
1171     }
1172
1173   return 0;
1174 }
1175
1176 /* *INDENT-OFF* */
1177 VLIB_CLI_COMMAND (dhcpv6_proxy_address_show_command, static) = {
1178   .path = "show dhcpv6 link-address interface",
1179   .short_help = "show dhcpv6 link-address interface <interface>",
1180   .function = dhcpv6_link_address_show_command_fn,
1181 };
1182 /* *INDENT-ON* */
1183
1184 /*
1185  * fd.io coding-style-patch-verification: ON
1186  *
1187  * Local Variables:
1188  * eval: (c-set-style "gnu")
1189  * End:
1190  */