src/plugins/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 <dhcp/dhcp_proxy.h>
  21 #include <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 <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           dhcp_vss_t *vss;
 183           u8 is_solicit = 0;
 184
 185           bi0 = from[0];
 186           from += 1;
 187           n_left_from -= 1;
 188
 189           b0 = vlib_get_buffer (vm, bi0);
 190
 191           h0 = vlib_buffer_get_current (b0);
 192
 193           /*
 194            * udp_local hands us the DHCPV6 header.
 195            */
 196           u0 = (void *) h0 - (sizeof (*u0));
 197           ip0 = (void *) u0 - (sizeof (*ip0));
 198           e_h0 = (void *) ip0 - ethernet_buffer_header_size (b0);
 199
 200           clib_memcpy (client_src_mac, e_h0->src_address, 6);
 201
 202           switch (h0->msg_type)
 203             {
 204             case DHCPV6_MSG_SOLICIT:
 205             case DHCPV6_MSG_REQUEST:
 206             case DHCPV6_MSG_CONFIRM:
 207             case DHCPV6_MSG_RENEW:
 208             case DHCPV6_MSG_REBIND:
 209             case DHCPV6_MSG_RELEASE:
 210             case DHCPV6_MSG_DECLINE:
 211             case DHCPV6_MSG_INFORMATION_REQUEST:
 212             case DHCPV6_MSG_RELAY_FORW:
 213               /* send to server */
 214               break;
 215             case DHCPV6_MSG_RELAY_REPL:
 216               /* send to client */
 217               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
 218               error0 = 0;
 219               pkts_to_client++;
 220               goto do_enqueue;
 221             default:
 222               /* drop the packet */
 223               pkts_wrong_msg_type++;
 224               error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 225               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 226               goto do_trace;
 227
 228             }
 229
 230           /* Send to DHCPV6 server via the configured FIB */
 231           rx_sw_if_index = sw_if_index =
 232             vnet_buffer (b0)->sw_if_index[VLIB_RX];
 233           rx_fib_idx = im->mfib_index_by_sw_if_index[rx_sw_if_index];
 234           proxy = dhcp_get_proxy (dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
 235
 236           if (PREDICT_FALSE (NULL == proxy))
 237             {
 238               error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 239               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 240               pkts_no_server++;
 241               goto do_trace;
 242             }
 243
 244           server = &proxy->dhcp_servers[0];
 245           server_fib_idx = server->server_fib_index;
 246           vnet_buffer (b0)->sw_if_index[VLIB_TX] = server_fib_idx;
 247
 248
 249           /* relay-option header pointer */
 250           vlib_buffer_advance (b0, -(sizeof (*fwd_opt)));
 251           fwd_opt = vlib_buffer_get_current (b0);
 252           /* relay message header pointer */
 253           vlib_buffer_advance (b0, -(sizeof (*r1)));
 254           r1 = vlib_buffer_get_current (b0);
 255
 256           vlib_buffer_advance (b0, -(sizeof (*u1)));
 257           u1 = vlib_buffer_get_current (b0);
 258
 259           vlib_buffer_advance (b0, -(sizeof (*ip1)));
 260           ip1 = vlib_buffer_get_current (b0);
 261
 262           /* fill in all that rubbish... */
 263           len = clib_net_to_host_u16 (u0->length) - sizeof (udp_header_t);
 264           copy_ip6_address (&r1->peer_addr, &ip0->src_address);
 265
 266           r1->msg_type = DHCPV6_MSG_RELAY_FORW;
 267           fwd_opt->length = clib_host_to_net_u16 (len);
 268           fwd_opt->option = clib_host_to_net_u16 (DHCPV6_OPTION_RELAY_MSG);
 269
 270           r1->hop_count++;
 271           r1->hop_count =
 272             (h0->msg_type != DHCPV6_MSG_RELAY_FORW) ? 0 : r1->hop_count;
 273
 274           if (PREDICT_FALSE (r1->hop_count >= HOP_COUNT_LIMIT))
 275             {
 276               error0 = DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 277               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 278               pkts_no_exceeding_max_hop++;
 279               goto do_trace;
 280             }
 281
 282
 283           /* If relay-fwd and src address is site or global unicast address  */
 284           if (h0->msg_type == DHCPV6_MSG_RELAY_FORW &&
 285               ((ip0->src_address.as_u8[0] & 0xe0) == 0x20 ||
 286                (ip0->src_address.as_u8[0] & 0xfe) == 0xfc))
 287             {
 288               /* Set link address to zero */
 289               r1->link_addr.as_u64[0] = 0;
 290               r1->link_addr.as_u64[1] = 0;
 291               goto link_address_set;
 292             }
 293
 294           /* if receiving interface is unnumbered, use receiving interface
 295            * IP address as link address, otherwise use the loopback interface
 296            * IP address as link address.
 297            */
 298
 299           swif = vnet_get_sw_interface (vnm, rx_sw_if_index);
 300           if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 301             sw_if_index = swif->unnumbered_sw_if_index;
 302
 303           ia0 =
 304             ip6_interface_first_global_or_site_address (&ip6_main,
 305                                                         sw_if_index);
 306           if (ia0 == 0)
 307             {
 308               error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 309               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 310               pkts_no_interface_address++;
 311               goto do_trace;
 312             }
 313
 314           copy_ip6_address (&r1->link_addr, ia0);
 315
 316         link_address_set:
 317
 318           if ((b0->current_data + b0->current_length + sizeof (*id1) +
 319                sizeof (*vss1) + sizeof (*cmac)) >
 320               vlib_buffer_get_default_data_size (vm))
 321             {
 322               error0 = DHCPV6_PROXY_ERROR_PKT_TOO_BIG;
 323               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 324               pkts_too_big++;
 325               goto do_trace;
 326             }
 327
 328           id1 = (dhcpv6_int_id_t *) (((uword) ip1) + b0->current_length);
 329           b0->current_length += (sizeof (*id1));
 330
 331           id1->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_INTERFACE_ID);
 332           id1->opt.length = clib_host_to_net_u16 (sizeof (rx_sw_if_index));
 333           id1->int_idx = clib_host_to_net_u32 (rx_sw_if_index);
 334
 335           u1->length = 0;
 336           if (h0->msg_type != DHCPV6_MSG_RELAY_FORW)
 337             {
 338               cmac =
 339                 (dhcpv6_client_mac_t *) (((uword) ip1) + b0->current_length);
 340               b0->current_length += (sizeof (*cmac));
 341               cmac->opt.length = clib_host_to_net_u16 (sizeof (*cmac) -
 342                                                        sizeof (cmac->opt));
 343               cmac->opt.option =
 344                 clib_host_to_net_u16
 345                 (DHCPV6_OPTION_CLIENT_LINK_LAYER_ADDRESS);
 346               cmac->link_type = clib_host_to_net_u16 (1);       /* ethernet */
 347               clib_memcpy (cmac->data, client_src_mac, 6);
 348               u1->length += sizeof (*cmac);
 349             }
 350
 351           vss = dhcp_get_vss_info (dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
 352
 353           if (vss)
 354             {
 355               u16 id_len;       /* length of VPN ID */
 356               u16 type_len = sizeof (vss1->vss_type);
 357
 358               vss1 = (dhcpv6_vss_t *) (((uword) ip1) + b0->current_length);
 359               vss1->vss_type = vss->vss_type;
 360               if (vss->vss_type == VSS_TYPE_VPN_ID)
 361                 {
 362                   id_len = sizeof (vss->vpn_id);        /* vpn_id is 7 bytes */
 363                   memcpy (vss1->data, vss->vpn_id, id_len);
 364                 }
 365               else if (vss->vss_type == VSS_TYPE_ASCII)
 366                 {
 367                   id_len = vec_len (vss->vpn_ascii_id);
 368                   memcpy (vss1->data, vss->vpn_ascii_id, id_len);
 369                 }
 370               else              /* must be VSS_TYPE_DEFAULT, no VPN ID */
 371                 id_len = 0;
 372
 373               vss1->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_VSS);
 374               vss1->opt.length = clib_host_to_net_u16 (type_len + id_len);
 375               u1->length += type_len + id_len + sizeof (vss1->opt);
 376               b0->current_length += type_len + id_len + sizeof (vss1->opt);
 377             }
 378
 379           pkts_to_server++;
 380           u1->checksum = 0;
 381           u1->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcpv6_to_client);
 382           u1->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcpv6_to_server);
 383
 384           u1->length =
 385             clib_host_to_net_u16 (clib_net_to_host_u16 (fwd_opt->length) +
 386                                   sizeof (*r1) + sizeof (*fwd_opt) +
 387                                   sizeof (*u1) + sizeof (*id1) + u1->length);
 388
 389           clib_memset (ip1, 0, sizeof (*ip1));
 390           ip1->ip_version_traffic_class_and_flow_label = 0x60;
 391           ip1->payload_length = u1->length;
 392           ip1->protocol = PROTO_UDP;
 393           ip1->hop_limit = HOP_COUNT_LIMIT;
 394           src = ((server->dhcp_server.ip6.as_u64[0] ||
 395                   server->dhcp_server.ip6.as_u64[1]) ?
 396                  &server->dhcp_server.ip6 : &all_dhcpv6_server_address);
 397           copy_ip6_address (&ip1->dst_address, src);
 398
 399
 400           ia0 = ip6_interface_first_global_or_site_address
 401             (&ip6_main, vnet_buffer (b0)->sw_if_index[VLIB_RX]);
 402
 403           src = (proxy->dhcp_src_address.ip6.as_u64[0] ||
 404                  proxy->dhcp_src_address.ip6.as_u64[1]) ?
 405             &proxy->dhcp_src_address.ip6 : ia0;
 406           if (ia0 == 0)
 407             {
 408               error0 = DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS;
 409               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 410               pkts_no_src_address++;
 411               goto do_trace;
 412             }
 413
 414           copy_ip6_address (&ip1->src_address, src);
 415
 416
 417           u1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip1,
 418                                                             &bogus_length);
 419           ASSERT (bogus_length == 0);
 420
 421           next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
 422
 423           is_solicit = (DHCPV6_MSG_SOLICIT == h0->msg_type);
 424
 425           /*
 426            * If we have multiple servers configured and this is the
 427            * client's discover message, then send copies to each of
 428            * those servers
 429            */
 430           if (is_solicit && vec_len (proxy->dhcp_servers) > 1)
 431             {
 432               u32 ii;
 433
 434               for (ii = 1; ii < vec_len (proxy->dhcp_servers); ii++)
 435                 {
 436                   vlib_buffer_t *c0;
 437                   u32 ci0;
 438
 439                   c0 = vlib_buffer_copy (vm, b0);
 440                   if (c0 == NULL)
 441                     {
 442                       vlib_node_increment_counter
 443                         (vm, dhcpv6_proxy_to_server_node.index,
 444                          DHCPV6_PROXY_ERROR_ALLOC_FAIL, 1);
 445                       continue;
 446                     }
 447                   VLIB_BUFFER_TRACE_TRAJECTORY_INIT (c0);
 448                   ci0 = vlib_get_buffer_index (vm, c0);
 449                   server = &proxy->dhcp_servers[ii];
 450
 451                   ip0 = vlib_buffer_get_current (c0);
 452
 453                   src = ((server->dhcp_server.ip6.as_u64[0] ||
 454                           server->dhcp_server.ip6.as_u64[1]) ?
 455                          &server->dhcp_server.ip6 :
 456                          &all_dhcpv6_server_address);
 457                   copy_ip6_address (&ip1->dst_address, src);
 458
 459                   to_next[0] = ci0;
 460                   to_next += 1;
 461                   n_left_to_next -= 1;
 462
 463                   vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 464                                                    to_next, n_left_to_next,
 465                                                    ci0, next0);
 466
 467                   if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 468                     {
 469                       dhcpv6_proxy_trace_t *tr;
 470
 471                       tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
 472                       tr->which = 0;    /* to server */
 473                       tr->error = error0;
 474                       tr->original_sw_if_index = rx_sw_if_index;
 475                       tr->sw_if_index = sw_if_index;
 476                       if (next0 == DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
 477                         copy_ip6_address ((ip6_address_t *) &
 478                                           tr->packet_data[0],
 479                                           &server->dhcp_server.ip6);
 480                     }
 481
 482                   if (PREDICT_FALSE (0 == n_left_to_next))
 483                     {
 484                       vlib_put_next_frame (vm, node, next_index,
 485                                            n_left_to_next);
 486                       vlib_get_next_frame (vm, node, next_index,
 487                                            to_next, n_left_to_next);
 488                     }
 489                 }
 490             }
 491
 492         do_trace:
 493           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 494             {
 495               dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 496                                                          b0, sizeof (*tr));
 497               tr->which = 0;    /* to server */
 498               tr->error = error0;
 499               tr->original_sw_if_index = rx_sw_if_index;
 500               tr->sw_if_index = sw_if_index;
 501               if (DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP == next0)
 502                 copy_ip6_address ((ip6_address_t *) & tr->packet_data[0],
 503                                   &server->dhcp_server.ip6);
 504             }
 505
 506         do_enqueue:
 507           to_next[0] = bi0;
 508           to_next += 1;
 509           n_left_to_next -= 1;
 510
 511           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 512                                            to_next, n_left_to_next,
 513                                            bi0, next0);
 514         }
 515
 516       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 517     }
 518
 519   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 520                                DHCPV6_PROXY_ERROR_RELAY_TO_CLIENT,
 521                                pkts_to_client);
 522   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 523                                DHCPV6_PROXY_ERROR_RELAY_TO_SERVER,
 524                                pkts_to_server);
 525   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 526                                DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS,
 527                                pkts_no_interface_address);
 528   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 529                                DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE,
 530                                pkts_wrong_msg_type);
 531   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 532                                DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS,
 533                                pkts_no_src_address);
 534   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 535                                DHCPV6_PROXY_ERROR_PKT_TOO_BIG, pkts_too_big);
 536   return from_frame->n_vectors;
 537 }
 538
 539 /* *INDENT-OFF* */
 540 VLIB_REGISTER_NODE (dhcpv6_proxy_to_server_node, static) = {
 541   .function = dhcpv6_proxy_to_server_input,
 542   .name = "dhcpv6-proxy-to-server",
 543   /* Takes a vector of packets. */
 544   .vector_size = sizeof (u32),
 545
 546   .n_errors = DHCPV6_PROXY_N_ERROR,
 547   .error_strings = dhcpv6_proxy_error_strings,
 548
 549   .n_next_nodes = DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
 550   .next_nodes = {
 551 #define _(s,n) [DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
 552     foreach_dhcpv6_proxy_to_server_input_next
 553 #undef _
 554   },
 555
 556   .format_buffer = format_dhcpv6_proxy_header_with_length,
 557   .format_trace = format_dhcpv6_proxy_trace,
 558 #if 0
 559   .unformat_buffer = unformat_dhcpv6_proxy_header,
 560 #endif
 561 };
 562 /* *INDENT-ON* */
 563
 564 static uword
 565 dhcpv6_proxy_to_client_input (vlib_main_t * vm,
 566                               vlib_node_runtime_t * node,
 567                               vlib_frame_t * from_frame)
 568 {
 569
 570   u32 n_left_from, *from;
 571   ethernet_main_t *em = vnet_get_ethernet_main ();
 572   dhcp_proxy_main_t *dm = &dhcp_proxy_main;
 573   dhcp_proxy_t *proxy;
 574   dhcp_server_t *server;
 575   vnet_main_t *vnm = vnet_get_main ();
 576   int bogus_length;
 577
 578   from = vlib_frame_vector_args (from_frame);
 579   n_left_from = from_frame->n_vectors;
 580
 581   while (n_left_from > 0)
 582     {
 583       u32 bi0;
 584       vlib_buffer_t *b0;
 585       udp_header_t *u0, *u1 = 0;
 586       dhcpv6_relay_hdr_t *h0;
 587       ip6_header_t *ip1 = 0, *ip0;
 588       ip6_address_t _ia0, *ia0 = &_ia0;
 589       ip6_address_t client_address;
 590       ethernet_interface_t *ei0;
 591       ethernet_header_t *mac0;
 592       vnet_hw_interface_t *hi0;
 593       vlib_frame_t *f0;
 594       u32 *to_next0;
 595       u32 sw_if_index = ~0;
 596       u32 original_sw_if_index = ~0;
 597       vnet_sw_interface_t *si0;
 598       u32 error0 = (u32) ~ 0;
 599       vnet_sw_interface_t *swif;
 600       dhcpv6_option_t *r0 = 0, *o;
 601       u16 len = 0;
 602       u8 interface_opt_flag = 0;
 603       u8 relay_msg_opt_flag = 0;
 604       ip6_main_t *im = &ip6_main;
 605       u32 server_fib_idx, client_fib_idx;
 606
 607       bi0 = from[0];
 608       from += 1;
 609       n_left_from -= 1;
 610
 611       b0 = vlib_get_buffer (vm, bi0);
 612       h0 = vlib_buffer_get_current (b0);
 613
 614       if (DHCPV6_MSG_RELAY_REPL != h0->msg_type)
 615         {
 616           error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 617
 618         drop_packet:
 619           vlib_node_increment_counter (vm, dhcpv6_proxy_to_client_node.index,
 620                                        error0, 1);
 621
 622           f0 = vlib_get_frame_to_node (vm, dm->error_drop_node_index);
 623           to_next0 = vlib_frame_vector_args (f0);
 624           to_next0[0] = bi0;
 625           f0->n_vectors = 1;
 626           vlib_put_frame_to_node (vm, dm->error_drop_node_index, f0);
 627           goto do_trace;
 628         }
 629       /* hop count seems not need to be checked */
 630       if (HOP_COUNT_LIMIT < h0->hop_count)
 631         {
 632           error0 = DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 633           goto drop_packet;
 634         }
 635       u0 = (void *) h0 - (sizeof (*u0));
 636       ip0 = (void *) u0 - (sizeof (*ip0));
 637
 638       vlib_buffer_advance (b0, sizeof (*h0));
 639       o = vlib_buffer_get_current (b0);
 640
 641       /* Parse through TLVs looking for option 18 (DHCPV6_OPTION_INTERFACE_ID)
 642          _and_ option 9 (DHCPV6_OPTION_RELAY_MSG) option which must be there.
 643          Currently assuming no other options need to be processed
 644          The interface-ID is the FIB number we need
 645          to track down the client-facing interface */
 646
 647       while ((u8 *) o < (b0->data + b0->current_data + b0->current_length))
 648         {
 649           if (DHCPV6_OPTION_INTERFACE_ID == clib_net_to_host_u16 (o->option))
 650             {
 651               interface_opt_flag = 1;
 652               if (clib_net_to_host_u16 (o->length) == sizeof (sw_if_index))
 653                 sw_if_index =
 654                   clib_net_to_host_u32 (((dhcpv6_int_id_t *) o)->int_idx);
 655               if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
 656                 {
 657                   error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION;
 658                   goto drop_packet;
 659                 }
 660             }
 661           if (DHCPV6_OPTION_RELAY_MSG == clib_net_to_host_u16 (o->option))
 662             {
 663               relay_msg_opt_flag = 1;
 664               r0 = vlib_buffer_get_current (b0);
 665             }
 666           if ((relay_msg_opt_flag == 1) && (interface_opt_flag == 1))
 667             break;
 668           vlib_buffer_advance (b0,
 669                                sizeof (*o) +
 670                                clib_net_to_host_u16 (o->length));
 671           o =
 672             (dhcpv6_option_t *) (((uword) o) +
 673                                  clib_net_to_host_u16 (o->length) +
 674                                  sizeof (*o));
 675         }
 676
 677       if ((relay_msg_opt_flag == 0) || (r0 == 0))
 678         {
 679           error0 = DHCPV6_PROXY_ERROR_NO_RELAY_MESSAGE_OPTION;
 680           goto drop_packet;
 681         }
 682
 683       if ((u32) ~ 0 == sw_if_index)
 684         {
 685           error0 = DHCPV6_PROXY_ERROR_NO_CIRCUIT_ID_OPTION;
 686           goto drop_packet;
 687         }
 688
 689       //Advance buffer to start of encapsulated DHCPv6 message
 690       vlib_buffer_advance (b0, sizeof (*r0));
 691
 692       client_fib_idx = im->mfib_index_by_sw_if_index[sw_if_index];
 693       proxy = dhcp_get_proxy (dm, client_fib_idx, FIB_PROTOCOL_IP6);
 694
 695       if (NULL == proxy)
 696         {
 697           error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 698           goto drop_packet;
 699         }
 700
 701       server_fib_idx = im->fib_index_by_sw_if_index
 702         [vnet_buffer (b0)->sw_if_index[VLIB_RX]];
 703
 704       vec_foreach (server, proxy->dhcp_servers)
 705       {
 706         if (server_fib_idx == server->server_fib_index &&
 707             ip0->src_address.as_u64[0] == server->dhcp_server.ip6.as_u64[0] &&
 708             ip0->src_address.as_u64[1] == server->dhcp_server.ip6.as_u64[1])
 709           {
 710             goto server_found;
 711           }
 712       }
 713
 714       //drop packet if not from server with configured address or FIB
 715       error0 = DHCPV6_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
 716       goto drop_packet;
 717
 718     server_found:
 719       vnet_buffer (b0)->sw_if_index[VLIB_TX] = original_sw_if_index
 720         = sw_if_index;
 721
 722       swif = vnet_get_sw_interface (vnm, original_sw_if_index);
 723       if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 724         sw_if_index = swif->unnumbered_sw_if_index;
 725
 726
 727       /*
 728        * udp_local hands us the DHCPV6 header, need udp hdr,
 729        * ip hdr to relay to client
 730        */
 731       vlib_buffer_advance (b0, -(sizeof (*u1)));
 732       u1 = vlib_buffer_get_current (b0);
 733
 734       vlib_buffer_advance (b0, -(sizeof (*ip1)));
 735       ip1 = vlib_buffer_get_current (b0);
 736
 737       copy_ip6_address (&client_address, &h0->peer_addr);
 738
 739       ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
 740       if (ia0 == 0)
 741         {
 742           error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 743           goto drop_packet;
 744         }
 745
 746       len = clib_net_to_host_u16 (r0->length);
 747       clib_memset (ip1, 0, sizeof (*ip1));
 748       copy_ip6_address (&ip1->dst_address, &client_address);
 749       u1->checksum = 0;
 750       u1->src_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_server);
 751       u1->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_client);
 752       u1->length = clib_host_to_net_u16 (len + sizeof (udp_header_t));
 753
 754       ip1->ip_version_traffic_class_and_flow_label =
 755         ip0->ip_version_traffic_class_and_flow_label & 0x00000fff;
 756       ip1->payload_length = u1->length;
 757       ip1->protocol = PROTO_UDP;
 758       ip1->hop_limit = HOP_COUNT_LIMIT;
 759       copy_ip6_address (&ip1->src_address, ia0);
 760
 761       u1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip1,
 762                                                         &bogus_length);
 763       ASSERT (bogus_length == 0);
 764
 765       vlib_buffer_advance (b0, -(sizeof (ethernet_header_t)));
 766       si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
 767       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 768         vlib_buffer_advance (b0, -4 /* space for VLAN tag */ );
 769
 770       mac0 = vlib_buffer_get_current (b0);
 771
 772       hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
 773       ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
 774       clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
 775       clib_memset (&mac0->dst_address, 0xff, sizeof (mac0->dst_address));
 776       mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
 777         clib_net_to_host_u16 (0x8100) : clib_net_to_host_u16 (0x86dd);
 778
 779       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 780         {
 781           u32 *vlan_tag = (u32 *) (mac0 + 1);
 782           u32 tmp;
 783           tmp = (si0->sub.id << 16) | 0x0800;
 784           *vlan_tag = clib_host_to_net_u32 (tmp);
 785         }
 786
 787       /* $$$ consider adding a dynamic next to the graph node, for performance */
 788       f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
 789       to_next0 = vlib_frame_vector_args (f0);
 790       to_next0[0] = bi0;
 791       f0->n_vectors = 1;
 792       vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
 793
 794     do_trace:
 795       if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 796         {
 797           dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 798                                                      b0, sizeof (*tr));
 799           tr->which = 1;        /* to client */
 800           if (ia0)
 801             copy_ip6_address ((ip6_address_t *) tr->packet_data, ia0);
 802           tr->error = error0;
 803           tr->original_sw_if_index = original_sw_if_index;
 804           tr->sw_if_index = sw_if_index;
 805         }
 806     }
 807   return from_frame->n_vectors;
 808
 809 }
 810
 811 /* *INDENT-OFF* */
 812 VLIB_REGISTER_NODE (dhcpv6_proxy_to_client_node, static) = {
 813   .function = dhcpv6_proxy_to_client_input,
 814   .name = "dhcpv6-proxy-to-client",
 815   /* Takes a vector of packets. */
 816   .vector_size = sizeof (u32),
 817
 818   .n_errors = DHCPV6_PROXY_N_ERROR,
 819   .error_strings = dhcpv6_proxy_error_strings,
 820   .format_buffer = format_dhcpv6_proxy_header_with_length,
 821   .format_trace = format_dhcpv6_proxy_trace,
 822 #if 0
 823   .unformat_buffer = unformat_dhcpv6_proxy_header,
 824 #endif
 825 };
 826 /* *INDENT-ON* */
 827
 828 static clib_error_t *
 829 dhcp6_proxy_init (vlib_main_t * vm)
 830 {
 831   dhcp_proxy_main_t *dm = &dhcp_proxy_main;
 832   vlib_node_t *error_drop_node;
 833
 834   error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
 835   dm->error_drop_node_index = error_drop_node->index;
 836
 837   /* RFC says this is the dhcpv6 server address  */
 838   all_dhcpv6_server_address.as_u64[0] =
 839     clib_host_to_net_u64 (0xFF05000000000000);
 840   all_dhcpv6_server_address.as_u64[1] = clib_host_to_net_u64 (0x00010003);
 841
 842   /* RFC says this is the server and agent address */
 843   all_dhcpv6_server_relay_agent_address.as_u64[0] =
 844     clib_host_to_net_u64 (0xFF02000000000000);
 845   all_dhcpv6_server_relay_agent_address.as_u64[1] =
 846     clib_host_to_net_u64 (0x00010002);
 847
 848   return 0;
 849 }
 850
 851 VLIB_INIT_FUNCTION (dhcp6_proxy_init);
 852
 853 int
 854 dhcp6_proxy_set_server (ip46_address_t * addr,
 855                         ip46_address_t * src_addr,
 856                         u32 rx_table_id, u32 server_table_id, int is_del)
 857 {
 858   vlib_main_t *vm = vlib_get_main ();
 859   u32 rx_fib_index = 0;
 860   int rc = 0;
 861
 862   const mfib_prefix_t all_dhcp_servers = {
 863     .fp_len = 128,
 864     .fp_proto = FIB_PROTOCOL_IP6,
 865     .fp_grp_addr = {
 866                     .ip6 = all_dhcpv6_server_relay_agent_address,
 867                     }
 868   };
 869
 870   if (ip46_address_is_zero (addr))
 871     return VNET_API_ERROR_INVALID_DST_ADDRESS;
 872
 873   if (ip46_address_is_zero (src_addr))
 874     return VNET_API_ERROR_INVALID_SRC_ADDRESS;
 875
 876   rx_fib_index = mfib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6,
 877                                                      rx_table_id,
 878                                                      MFIB_SOURCE_DHCP);
 879
 880   if (is_del)
 881     {
 882       if (dhcp_proxy_server_del (FIB_PROTOCOL_IP6, rx_fib_index,
 883                                  addr, server_table_id))
 884         {
 885           mfib_table_entry_delete (rx_fib_index,
 886                                    &all_dhcp_servers, MFIB_SOURCE_DHCP);
 887           mfib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP6,
 888                              MFIB_SOURCE_DHCP);
 889
 890           udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 891                                    0 /* is_ip6 */ );
 892           udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
 893                                    0 /* is_ip6 */ );
 894         }
 895     }
 896   else
 897     {
 898       const fib_route_path_t path_for_us = {
 899         .frp_proto = DPO_PROTO_IP6,
 900         .frp_addr = zero_addr,
 901         .frp_sw_if_index = 0xffffffff,
 902         .frp_fib_index = ~0,
 903         .frp_weight = 1,
 904         .frp_flags = FIB_ROUTE_PATH_LOCAL,
 905         .frp_mitf_flags = MFIB_ITF_FLAG_FORWARD,
 906       };
 907       if (dhcp_proxy_server_add (FIB_PROTOCOL_IP6, addr, src_addr,
 908                                  rx_fib_index, server_table_id))
 909         {
 910           mfib_table_entry_path_update (rx_fib_index,
 911                                         &all_dhcp_servers,
 912                                         MFIB_SOURCE_DHCP, &path_for_us);
 913           /*
 914            * Each interface that is enabled in this table, needs to be added
 915            * as an accepting interface, but this is not easily doable in VPP.
 916            * So we cheat. Add a flag to the entry that indicates accept form
 917            * any interface.
 918            * We will still only accept on v6 enabled interfaces, since the
 919            * input feature ensures this.
 920            */
 921           mfib_table_entry_update (rx_fib_index,
 922                                    &all_dhcp_servers,
 923                                    MFIB_SOURCE_DHCP,
 924                                    MFIB_RPF_ID_NONE,
 925                                    MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF);
 926           mfib_table_lock (rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 927
 928           udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 929                                  dhcpv6_proxy_to_client_node.index,
 930                                  0 /* is_ip6 */ );
 931           udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
 932                                  dhcpv6_proxy_to_server_node.index,
 933                                  0 /* is_ip6 */ );
 934         }
 935     }
 936
 937   mfib_table_unlock (rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 938
 939   return (rc);
 940 }
 941
 942 static clib_error_t *
 943 dhcpv6_proxy_set_command_fn (vlib_main_t * vm,
 944                              unformat_input_t * input,
 945                              vlib_cli_command_t * cmd)
 946 {
 947   ip46_address_t addr, src_addr;
 948   int set_server = 0, set_src_address = 0;
 949   u32 rx_table_id = 0, server_table_id = 0;
 950   int is_del = 0;
 951
 952   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 953     {
 954       if (unformat (input, "server %U", unformat_ip6_address, &addr.ip6))
 955         set_server = 1;
 956       else if (unformat (input, "src-address %U",
 957                          unformat_ip6_address, &src_addr.ip6))
 958         set_src_address = 1;
 959       else if (unformat (input, "server-fib-id %d", &server_table_id))
 960         ;
 961       else if (unformat (input, "rx-fib-id %d", &rx_table_id))
 962         ;
 963       else if (unformat (input, "delete") || unformat (input, "del"))
 964         is_del = 1;
 965       else
 966         break;
 967     }
 968
 969   if (is_del || (set_server && set_src_address))
 970     {
 971       int rv;
 972
 973       rv = dhcp6_proxy_set_server (&addr, &src_addr, rx_table_id,
 974                                    server_table_id, is_del);
 975
 976       //TODO: Complete the errors
 977       switch (rv)
 978         {
 979         case 0:
 980           return 0;
 981
 982         case VNET_API_ERROR_INVALID_DST_ADDRESS:
 983           return clib_error_return (0, "Invalid server address");
 984
 985         case VNET_API_ERROR_INVALID_SRC_ADDRESS:
 986           return clib_error_return (0, "Invalid src address");
 987
 988         case VNET_API_ERROR_NO_SUCH_ENTRY:
 989           return clib_error_return
 990             (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
 991
 992         default:
 993           return clib_error_return (0, "BUG: rv %d", rv);
 994         }
 995     }
 996   else
 997     return clib_error_return (0, "parse error`%U'",
 998                               format_unformat_error, input);
 999 }
1000
1001 /* *INDENT-OFF* */
1002 VLIB_CLI_COMMAND (dhcpv6_proxy_set_command, static) = {
1003   .path = "set dhcpv6 proxy",
1004   .short_help = "set dhcpv6 proxy [del] server <ipv6-addr> src-address <ipv6-addr> "
1005                   "[server-fib-id <fib-id>] [rx-fib-id <fib-id>] ",
1006   .function = dhcpv6_proxy_set_command_fn,
1007 };
1008 /* *INDENT-ON* */
1009
1010 static u8 *
1011 format_dhcp6_proxy_server (u8 * s, va_list * args)
1012 {
1013   dhcp_proxy_t *proxy = va_arg (*args, dhcp_proxy_t *);
1014   fib_table_t *server_fib;
1015   dhcp_server_t *server;
1016   ip6_mfib_t *rx_fib;
1017
1018   if (proxy == 0)
1019     {
1020       s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
1021                   "Servers FIB,Address");
1022       return s;
1023     }
1024
1025   rx_fib = ip6_mfib_get (proxy->rx_fib_index);
1026
1027   s = format (s, "%=14u%=16U",
1028               rx_fib->table_id,
1029               format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
1030
1031   vec_foreach (server, proxy->dhcp_servers)
1032   {
1033     server_fib = fib_table_get (server->server_fib_index, FIB_PROTOCOL_IP6);
1034     s = format (s, "%u,%U  ",
1035                 server_fib->ft_table_id,
1036                 format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
1037   }
1038
1039   return s;
1040 }
1041
1042 static int
1043 dhcp6_proxy_show_walk (dhcp_proxy_t * proxy, void *ctx)
1044 {
1045   vlib_main_t *vm = ctx;
1046
1047   vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, proxy);
1048
1049   return (1);
1050 }
1051
1052 static clib_error_t *
1053 dhcpv6_proxy_show_command_fn (vlib_main_t * vm,
1054                               unformat_input_t * input,
1055                               vlib_cli_command_t * cmd)
1056 {
1057   vlib_cli_output (vm, "%U", format_dhcp6_proxy_server,
1058                    NULL /* header line */ );
1059
1060   dhcp_proxy_walk (FIB_PROTOCOL_IP6, dhcp6_proxy_show_walk, vm);
1061
1062   return (NULL);
1063 }
1064
1065 /* *INDENT-OFF* */
1066 VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = {
1067   .path = "show dhcpv6 proxy",
1068   .short_help = "Display dhcpv6 proxy info",
1069   .function = dhcpv6_proxy_show_command_fn,
1070 };
1071 /* *INDENT-ON* */
1072
1073 static clib_error_t *
1074 dhcpv6_vss_command_fn (vlib_main_t * vm,
1075                        unformat_input_t * input, vlib_cli_command_t * cmd)
1076 {
1077   u8 is_del = 0, vss_type = VSS_TYPE_DEFAULT;
1078   u8 *vpn_ascii_id = 0;
1079   u32 oui = 0, fib_id = 0, tbl_id = ~0;
1080
1081   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1082     {
1083       if (unformat (input, "table %d", &tbl_id))
1084         ;
1085       else if (unformat (input, "oui %d", &oui))
1086         vss_type = VSS_TYPE_VPN_ID;
1087       else if (unformat (input, "vpn-id %d", &fib_id))
1088         vss_type = VSS_TYPE_VPN_ID;
1089       else if (unformat (input, "vpn-ascii-id %s", &vpn_ascii_id))
1090         vss_type = VSS_TYPE_ASCII;
1091       else if (unformat (input, "delete") || unformat (input, "del"))
1092         is_del = 1;
1093       else
1094         break;
1095     }
1096
1097   if (tbl_id == ~0)
1098     return clib_error_return (0, "no table ID specified.");
1099
1100   int rv = dhcp_proxy_set_vss (FIB_PROTOCOL_IP6, tbl_id, vss_type,
1101                                vpn_ascii_id, oui, fib_id, is_del);
1102   switch (rv)
1103     {
1104     case 0:
1105       return 0;
1106     case VNET_API_ERROR_NO_SUCH_ENTRY:
1107       return clib_error_return (0, "vss for table %d not found in pool.",
1108                                 tbl_id);
1109     default:
1110       return clib_error_return (0, "BUG: rv %d", rv);
1111     }
1112 }
1113
1114 /* *INDENT-OFF* */
1115 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_command, static) = {
1116   .path = "set dhcpv6 vss",
1117   .short_help = "set dhcpv6 vss table <table-id> [oui <n> vpn-id <n> | vpn-ascii-id <text>]",
1118   .function = dhcpv6_vss_command_fn,
1119 };
1120 /* *INDENT-ON* */
1121
1122 static clib_error_t *
1123 dhcpv6_vss_show_command_fn (vlib_main_t * vm,
1124                             unformat_input_t * input,
1125                             vlib_cli_command_t * cmd)
1126 {
1127   dhcp_vss_walk (FIB_PROTOCOL_IP6, dhcp_vss_show_walk, vm);
1128
1129   return (NULL);
1130 }
1131
1132 /* *INDENT-OFF* */
1133 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_show_command, static) = {
1134   .path = "show dhcpv6 vss",
1135   .short_help = "show dhcpv6 VSS",
1136   .function = dhcpv6_vss_show_command_fn,
1137 };
1138 /* *INDENT-ON* */
1139
1140 static clib_error_t *
1141 dhcpv6_link_address_show_command_fn (vlib_main_t * vm,
1142                                      unformat_input_t * input,
1143                                      vlib_cli_command_t * cmd)
1144 {
1145   vnet_main_t *vnm = vnet_get_main ();
1146   u32 sw_if_index0 = 0, sw_if_index;
1147   vnet_sw_interface_t *swif;
1148   ip6_address_t *ia0;
1149
1150   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1151     {
1152
1153       if (unformat (input, "%U",
1154                     unformat_vnet_sw_interface, vnm, &sw_if_index0))
1155         {
1156           swif = vnet_get_sw_interface (vnm, sw_if_index0);
1157           sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1158             swif->unnumbered_sw_if_index : sw_if_index0;
1159           ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
1160           if (ia0)
1161             {
1162               vlib_cli_output (vm, "%=20s%=48s", "interface", "link-address");
1163
1164               vlib_cli_output (vm, "%=20U%=48U",
1165                                format_vnet_sw_if_index_name, vnm,
1166                                sw_if_index0, format_ip6_address, ia0);
1167             }
1168           else
1169             vlib_cli_output (vm, "%=34s%=20U",
1170                              "No IPv6 address configured on",
1171                              format_vnet_sw_if_index_name, vnm, sw_if_index);
1172         }
1173       else
1174         break;
1175     }
1176
1177   return 0;
1178 }
1179
1180 /* *INDENT-OFF* */
1181 VLIB_CLI_COMMAND (dhcpv6_proxy_address_show_command, static) = {
1182   .path = "show dhcpv6 link-address interface",
1183   .short_help = "show dhcpv6 link-address interface <interface>",
1184   .function = dhcpv6_link_address_show_command_fn,
1185 };
1186 /* *INDENT-ON* */
1187
1188 /*
1189  * fd.io coding-style-patch-verification: ON
1190  *
1191  * Local Variables:
1192  * eval: (c-set-style "gnu")
1193  * End:
1194  */