src/vnet/dhcp/dhcp6_proxy_node.c

   1 /*
   2  * dhcp6_proxy_node.c: dhcpv6 proxy node processing
   3  *
   4  * Copyright (c) 2013 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <vlib/vlib.h>
  19 #include <vnet/pg/pg.h>
  20 #include <vnet/dhcp/dhcp_proxy.h>
  21 #include <vnet/dhcp/dhcp6_packet.h>
  22 #include <vnet/mfib/mfib_table.h>
  23 #include <vnet/mfib/ip6_mfib.h>
  24 #include <vnet/fib/fib.h>
  25
  26 static char * dhcpv6_proxy_error_strings[] = {
  27 #define dhcpv6_proxy_error(n,s) s,
  28 #include <vnet/dhcp/dhcp6_proxy_error.def>
  29 #undef dhcpv6_proxy_error
  30 };
  31
  32 #define foreach_dhcpv6_proxy_to_server_input_next \
  33   _ (DROP, "error-drop")                        \
  34   _ (LOOKUP, "ip6-lookup")                      \
  35   _ (SEND_TO_CLIENT, "dhcpv6-proxy-to-client")
  36
  37
  38 typedef enum {
  39 #define _(s,n) DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s,
  40   foreach_dhcpv6_proxy_to_server_input_next
  41 #undef _
  42   DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
  43 } dhcpv6_proxy_to_server_input_next_t;
  44
  45 typedef struct {
  46   /* 0 => to server, 1 => to client */
  47   int which;
  48   u8 packet_data[64];
  49   u32 error;
  50   u32 sw_if_index;
  51   u32 original_sw_if_index;
  52 } dhcpv6_proxy_trace_t;
  53
  54 static vlib_node_registration_t dhcpv6_proxy_to_server_node;
  55 static vlib_node_registration_t dhcpv6_proxy_to_client_node;
  56
  57 /* all DHCP servers address */
  58 static ip6_address_t all_dhcpv6_server_address;
  59 static ip6_address_t all_dhcpv6_server_relay_agent_address;
  60
  61 static u8 *
  62 format_dhcpv6_proxy_trace (u8 * s, va_list * args)
  63 {
  64   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  65   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  66   dhcpv6_proxy_trace_t * t = va_arg (*args, dhcpv6_proxy_trace_t *);
  67
  68   if (t->which == 0)
  69     s = format (s, "DHCPV6 proxy: sent to server %U",
  70                 format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
  71   else
  72     s = format (s, "DHCPV6 proxy: sent to client from %U",
  73                 format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
  74   if (t->error != (u32)~0)
  75     s = format (s, " error: %s\n", dhcpv6_proxy_error_strings[t->error]);
  76
  77   s = format (s, "  original_sw_if_index: %d, sw_if_index: %d\n",
  78               t->original_sw_if_index, t->sw_if_index);
  79
  80   return s;
  81 }
  82
  83 static u8 *
  84 format_dhcpv6_proxy_header_with_length (u8 * s, va_list * args)
  85 {
  86   dhcpv6_header_t * h = va_arg (*args, dhcpv6_header_t *);
  87   u32 max_header_bytes = va_arg (*args, u32);
  88   u32 header_bytes;
  89
  90   header_bytes = sizeof (h[0]);
  91   if (max_header_bytes != 0 && header_bytes > max_header_bytes)
  92     return format (s, "dhcpv6 header truncated");
  93
  94   s = format (s, "DHCPV6 Proxy");
  95
  96   return s;
  97 }
  98 /* get first interface address */
  99 static ip6_address_t *
 100 ip6_interface_first_global_or_site_address (ip6_main_t * im, u32 sw_if_index)
 101 {
 102   ip_lookup_main_t * lm = &im->lookup_main;
 103   ip_interface_address_t * ia = 0;
 104   ip6_address_t * result = 0;
 105
 106   foreach_ip_interface_address (lm, ia, sw_if_index,
 107                                 1 /* honor unnumbered */,
 108   ({
 109     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 110     if ((a->as_u8[0] & 0xe0) == 0x20 ||
 111         (a->as_u8[0] & 0xfe) == 0xfc)  {
 112         result = a;
 113         break;
 114     }
 115   }));
 116   return result;
 117 }
 118
 119 static inline void copy_ip6_address (ip6_address_t *dst,
 120                                      ip6_address_t *src)
 121 {
 122   dst->as_u64[0] = src->as_u64[0];
 123   dst->as_u64[1] = src->as_u64[1];
 124 }
 125
 126 static uword
 127 dhcpv6_proxy_to_server_input (vlib_main_t * vm,
 128                               vlib_node_runtime_t * node,
 129                               vlib_frame_t * from_frame)
 130 {
 131   u32 n_left_from, next_index, * from, * to_next;
 132   dhcp_proxy_main_t * dpm = &dhcp_proxy_main;
 133   from = vlib_frame_vector_args (from_frame);
 134   n_left_from = from_frame->n_vectors;
 135   u32 pkts_to_server=0, pkts_to_client=0, pkts_no_server=0;
 136   u32 pkts_no_interface_address=0, pkts_no_exceeding_max_hop=0;
 137   u32 pkts_no_src_address=0;
 138   u32 pkts_wrong_msg_type=0;
 139   u32 pkts_too_big=0;
 140   ip6_main_t * im = &ip6_main;
 141   ip6_address_t * src;
 142   int bogus_length;
 143   dhcp_proxy_t *proxy;
 144   dhcp_server_t *server;
 145   u32  rx_fib_idx = 0, server_fib_idx = 0;
 146
 147   next_index = node->cached_next_index;
 148
 149   while (n_left_from > 0)
 150     {
 151       u32 n_left_to_next;
 152
 153       vlib_get_next_frame (vm, node, next_index,
 154                            to_next, n_left_to_next);
 155
 156       while (n_left_from > 0 && n_left_to_next > 0)
 157         {
 158           vnet_main_t *vnm = vnet_get_main();
 159           u32 sw_if_index = 0;
 160           u32 rx_sw_if_index = 0;
 161           vnet_sw_interface_t *swif;
 162           u32 bi0;
 163           vlib_buffer_t * b0;
 164           udp_header_t * u0, *u1;
 165           dhcpv6_header_t * h0;  // client msg hdr
 166           ip6_header_t * ip0, *ip1;
 167           ip6_address_t _ia0, *ia0=&_ia0;
 168           u32 next0;
 169           u32 error0 = (u32) ~0;
 170           dhcpv6_option_t *fwd_opt;
 171           dhcpv6_relay_hdr_t *r1;
 172           u16 len;
 173           dhcpv6_int_id_t *id1;
 174           dhcpv6_vss_t *vss1;
 175           dhcpv6_client_mac_t *cmac; // client mac
 176           ethernet_header_t * e_h0;
 177           u8 client_src_mac[6];
 178           vlib_buffer_free_list_t *fl;
 179           dhcp_vss_t *vss;
 180           u8 is_solicit = 0;
 181
 182           bi0 = from[0];
 183           from += 1;
 184           n_left_from -= 1;
 185
 186           b0 = vlib_get_buffer (vm, bi0);
 187
 188           h0 = vlib_buffer_get_current (b0);
 189
 190           /*
 191            * udp_local hands us the DHCPV6 header.
 192            */
 193           u0 = (void *)h0 -(sizeof(*u0));
 194           ip0 = (void *)u0 -(sizeof(*ip0));
 195           e_h0 = (void *)ip0 - ethernet_buffer_header_size(b0);
 196
 197           clib_memcpy(client_src_mac, e_h0->src_address, 6);
 198
 199           switch (h0->u.msg_type) {
 200             case DHCPV6_MSG_SOLICIT:
 201             case DHCPV6_MSG_REQUEST:
 202             case DHCPV6_MSG_CONFIRM:
 203             case DHCPV6_MSG_RENEW:
 204             case DHCPV6_MSG_REBIND:
 205             case DHCPV6_MSG_RELEASE:
 206             case DHCPV6_MSG_DECLINE:
 207             case DHCPV6_MSG_INFORMATION_REQUEST:
 208             case DHCPV6_MSG_RELAY_FORW:
 209                 /* send to server */
 210                 break;
 211             case DHCPV6_MSG_RELAY_REPL:
 212                 /* send to client */
 213                 next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
 214                 error0 = 0;
 215                 pkts_to_client++;
 216                 goto do_enqueue;
 217             default:
 218                 /* drop the packet */
 219                 pkts_wrong_msg_type++;
 220                 error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 221                 next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 222                 goto do_trace;
 223
 224           }
 225
 226           /* Send to DHCPV6 server via the configured FIB */
 227           rx_sw_if_index = sw_if_index =  vnet_buffer(b0)->sw_if_index[VLIB_RX];
 228           rx_fib_idx = im->mfib_index_by_sw_if_index [rx_sw_if_index];
 229           proxy = dhcp_get_proxy(dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
 230
 231           if (PREDICT_FALSE (NULL == proxy))
 232           {
 233               error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 234               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 235               pkts_no_server++;
 236               goto do_trace;
 237           }
 238
 239           server = &proxy->dhcp_servers[0];
 240           server_fib_idx = server->server_fib_index;
 241           vnet_buffer(b0)->sw_if_index[VLIB_TX] = server_fib_idx;
 242
 243
 244           /* relay-option header pointer */
 245           vlib_buffer_advance(b0, -(sizeof(*fwd_opt)));
 246           fwd_opt = vlib_buffer_get_current(b0);
 247           /* relay message header pointer */
 248           vlib_buffer_advance(b0, -(sizeof(*r1)));
 249           r1 = vlib_buffer_get_current(b0);
 250
 251           vlib_buffer_advance(b0, -(sizeof(*u1)));
 252           u1 = vlib_buffer_get_current(b0);
 253
 254           vlib_buffer_advance(b0, -(sizeof(*ip1)));
 255           ip1 = vlib_buffer_get_current(b0);
 256
 257           /* fill in all that rubbish... */
 258           len = clib_net_to_host_u16(u0->length) - sizeof(udp_header_t);
 259           copy_ip6_address(&r1->peer_addr, &ip0->src_address);
 260
 261           r1->msg_type = DHCPV6_MSG_RELAY_FORW;
 262           fwd_opt->length = clib_host_to_net_u16(len);
 263           fwd_opt->option = clib_host_to_net_u16(DHCPV6_OPTION_RELAY_MSG);
 264
 265           r1->hop_count++;
 266           r1->hop_count = (h0->u.msg_type != DHCPV6_MSG_RELAY_FORW) ? 0 : r1->hop_count;
 267
 268           if (PREDICT_FALSE(r1->hop_count >= HOP_COUNT_LIMIT))
 269             {
 270               error0 =  DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 271               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 272               pkts_no_exceeding_max_hop++;
 273               goto do_trace;
 274             }
 275
 276
 277           /* If relay-fwd and src address is site or global unicast address  */
 278           if (h0->u.msg_type == DHCPV6_MSG_RELAY_FORW &&
 279               ((ip0->src_address.as_u8[0] & 0xe0) == 0x20 ||
 280                (ip0->src_address.as_u8[0] & 0xfe) == 0xfc))
 281             {
 282               /* Set link address to zero */
 283               r1->link_addr.as_u64[0] = 0;
 284               r1->link_addr.as_u64[1] = 0;
 285               goto link_address_set;
 286             }
 287
 288           /* if receiving interface is unnumbered, use receiving interface
 289            * IP address as link address, otherwise use the loopback interface
 290            * IP address as link address.
 291            */
 292
 293           swif = vnet_get_sw_interface (vnm, rx_sw_if_index);
 294           if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 295               sw_if_index = swif->unnumbered_sw_if_index;
 296
 297           ia0 = ip6_interface_first_global_or_site_address(&ip6_main, sw_if_index);
 298           if (ia0 == 0)
 299             {
 300               error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 301               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 302               pkts_no_interface_address++;
 303               goto do_trace;
 304             }
 305
 306           copy_ip6_address(&r1->link_addr, ia0);
 307
 308         link_address_set:
 309           fl = vlib_buffer_get_free_list (vm, vlib_buffer_get_free_list_index (b0));
 310
 311           if ((b0->current_length+sizeof(*id1)+sizeof(*vss1)+sizeof(*cmac))
 312               > fl->n_data_bytes)
 313             {
 314               error0 = DHCPV6_PROXY_ERROR_PKT_TOO_BIG;
 315               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 316               pkts_too_big++;
 317               goto do_trace;
 318             }
 319
 320           id1 = (dhcpv6_int_id_t *) (((uword) ip1) + b0->current_length);
 321           b0->current_length += (sizeof (*id1));
 322
 323           id1->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_INTERFACE_ID);
 324           id1->opt.length = clib_host_to_net_u16(sizeof(rx_sw_if_index));
 325           id1->int_idx = clib_host_to_net_u32(rx_sw_if_index);
 326
 327           u1->length =0;
 328           if (h0->u.msg_type != DHCPV6_MSG_RELAY_FORW)
 329             {
 330                cmac = (dhcpv6_client_mac_t *) (((uword) ip1) + b0->current_length);
 331                b0->current_length += (sizeof (*cmac));
 332                cmac->opt.length =clib_host_to_net_u16(sizeof(*cmac) -
 333                                                       sizeof(cmac->opt));
 334                cmac->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_CLIENT_LINK_LAYER_ADDRESS);
 335                cmac->link_type = clib_host_to_net_u16(1); // ethernet
 336                clib_memcpy(cmac->data, client_src_mac, 6);
 337                u1->length += sizeof(*cmac);
 338             }
 339
 340           vss = dhcp_get_vss_info(dpm, rx_fib_idx, FIB_PROTOCOL_IP6);
 341
 342           if (NULL != vss) {
 343               vss1 = (dhcpv6_vss_t *) (((uword) ip1) + b0->current_length);
 344               b0->current_length += (sizeof (*vss1));
 345               vss1->opt.length =clib_host_to_net_u16(sizeof(*vss1) -
 346                                                      sizeof(vss1->opt));
 347               vss1->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_VSS);
 348               vss1->data[0] = 1;   // type
 349               vss1->data[1] = vss->oui >>16 & 0xff;
 350               vss1->data[2] = vss->oui >>8  & 0xff;
 351               vss1->data[3] = vss->oui & 0xff;
 352               vss1->data[4] = vss->fib_id >> 24 & 0xff;
 353               vss1->data[5] = vss->fib_id >> 16 & 0xff;
 354               vss1->data[6] = vss->fib_id >> 8 & 0xff;
 355               vss1->data[7] = vss->fib_id & 0xff;
 356               u1->length += sizeof(*vss1);
 357           }
 358
 359           pkts_to_server++;
 360           u1->checksum = 0;
 361           u1->src_port = clib_host_to_net_u16(UDP_DST_PORT_dhcpv6_to_client);
 362           u1->dst_port = clib_host_to_net_u16(UDP_DST_PORT_dhcpv6_to_server);
 363
 364           u1->length =
 365               clib_host_to_net_u16( clib_net_to_host_u16(fwd_opt->length) +
 366                                     sizeof(*r1) + sizeof(*fwd_opt) +
 367                                     sizeof(*u1) + sizeof(*id1) + u1->length);
 368
 369           memset(ip1, 0, sizeof(*ip1));
 370           ip1->ip_version_traffic_class_and_flow_label = 0x60;
 371           ip1->payload_length =  u1->length;
 372           ip1->protocol = PROTO_UDP;
 373           ip1->hop_limit = HOP_COUNT_LIMIT;
 374           src = ((server->dhcp_server.ip6.as_u64[0] ||
 375                   server->dhcp_server.ip6.as_u64[1]) ?
 376                  &server->dhcp_server.ip6 :
 377                  &all_dhcpv6_server_address);
 378           copy_ip6_address(&ip1->dst_address, src);
 379
 380
 381           ia0 = ip6_interface_first_global_or_site_address
 382               (&ip6_main, vnet_buffer(b0)->sw_if_index[VLIB_RX]);
 383
 384               src = (proxy->dhcp_src_address.ip6.as_u64[0] ||
 385                      proxy->dhcp_src_address.ip6.as_u64[1]) ?
 386                 &proxy->dhcp_src_address.ip6 : ia0;
 387           if (ia0 == 0)
 388             {
 389               error0 = DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS;
 390               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 391               pkts_no_src_address++;
 392               goto do_trace;
 393             }
 394
 395           copy_ip6_address (&ip1->src_address, src);
 396
 397
 398           u1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, ip1,
 399                                                            &bogus_length);
 400           ASSERT(bogus_length == 0);
 401
 402           next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
 403
 404           is_solicit = (DHCPV6_MSG_SOLICIT == h0->u.msg_type);
 405
 406           /*
 407            * If we have multiple servers configured and this is the
 408            * client's discover message, then send copies to each of
 409            * those servers
 410            */
 411           if (is_solicit && vec_len(proxy->dhcp_servers) > 1)
 412           {
 413               u32 ii;
 414
 415               for (ii = 1; ii < vec_len(proxy->dhcp_servers); ii++)
 416               {
 417                   vlib_buffer_t *c0;
 418                   u32 ci0;
 419
 420                   c0 = vlib_buffer_copy(vm, b0);
 421                   ci0 = vlib_get_buffer_index(vm, c0);
 422                   server = &proxy->dhcp_servers[ii];
 423
 424                   ip0 = vlib_buffer_get_current (c0);
 425
 426                   src = ((server->dhcp_server.ip6.as_u64[0] ||
 427                           server->dhcp_server.ip6.as_u64[1]) ?
 428                          &server->dhcp_server.ip6 :
 429                          &all_dhcpv6_server_address);
 430                   copy_ip6_address(&ip1->dst_address, src);
 431
 432                   to_next[0] = ci0;
 433                   to_next += 1;
 434                   n_left_to_next -= 1;
 435
 436                   vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 437                                                    to_next, n_left_to_next,
 438                                                    ci0, next0);
 439
 440                   if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 441                   {
 442                       dhcpv6_proxy_trace_t *tr;
 443
 444                       tr = vlib_add_trace (vm, node, c0, sizeof (*tr));
 445                       tr->which = 0; /* to server */
 446                       tr->error = error0;
 447                       tr->original_sw_if_index = rx_sw_if_index;
 448                       tr->sw_if_index = sw_if_index;
 449                       if (next0 == DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP)
 450                           copy_ip6_address((ip6_address_t *)&tr->packet_data[0],
 451                                            &server->dhcp_server.ip6);
 452                   }
 453
 454                   if (PREDICT_FALSE(0 == n_left_to_next))
 455                   {
 456                       vlib_put_next_frame (vm, node, next_index,
 457                                            n_left_to_next);
 458                       vlib_get_next_frame (vm, node, next_index,
 459                                            to_next, n_left_to_next);
 460                   }
 461               }
 462           }
 463
 464         do_trace:
 465           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 466             {
 467                dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 468                                                           b0, sizeof (*tr));
 469                tr->which = 0; /* to server */
 470                tr->error = error0;
 471                tr->original_sw_if_index = rx_sw_if_index;
 472                tr->sw_if_index = sw_if_index;
 473                if (DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP == next0)
 474                  copy_ip6_address((ip6_address_t *)&tr->packet_data[0], &server->dhcp_server.ip6);
 475             }
 476
 477         do_enqueue:
 478           to_next[0] = bi0;
 479           to_next += 1;
 480           n_left_to_next -= 1;
 481
 482           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 483                                            to_next, n_left_to_next,
 484                                            bi0, next0);
 485         }
 486
 487       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 488     }
 489
 490   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 491                                DHCPV6_PROXY_ERROR_RELAY_TO_CLIENT,
 492                                pkts_to_client);
 493   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 494                                DHCPV6_PROXY_ERROR_RELAY_TO_SERVER,
 495                                pkts_to_server);
 496   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 497                                DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS,
 498                                pkts_no_interface_address);
 499   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 500                                DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE,
 501                                pkts_wrong_msg_type);
 502   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 503                                DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS,
 504                                pkts_no_src_address);
 505   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 506                                DHCPV6_PROXY_ERROR_PKT_TOO_BIG,
 507                                pkts_too_big);
 508   return from_frame->n_vectors;
 509 }
 510
 511 VLIB_REGISTER_NODE (dhcpv6_proxy_to_server_node, static) = {
 512   .function = dhcpv6_proxy_to_server_input,
 513   .name = "dhcpv6-proxy-to-server",
 514   /* Takes a vector of packets. */
 515   .vector_size = sizeof (u32),
 516
 517   .n_errors = DHCPV6_PROXY_N_ERROR,
 518   .error_strings = dhcpv6_proxy_error_strings,
 519
 520   .n_next_nodes = DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
 521   .next_nodes = {
 522 #define _(s,n) [DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
 523     foreach_dhcpv6_proxy_to_server_input_next
 524 #undef _
 525   },
 526
 527   .format_buffer = format_dhcpv6_proxy_header_with_length,
 528   .format_trace = format_dhcpv6_proxy_trace,
 529 #if 0
 530   .unformat_buffer = unformat_dhcpv6_proxy_header,
 531 #endif
 532 };
 533
 534 static uword
 535 dhcpv6_proxy_to_client_input (vlib_main_t * vm,
 536                             vlib_node_runtime_t * node,
 537                             vlib_frame_t * from_frame)
 538 {
 539
 540   u32 n_left_from, * from;
 541   ethernet_main_t *em = ethernet_get_main (vm);
 542   dhcp_proxy_main_t * dm = &dhcp_proxy_main;
 543   dhcp_proxy_t *proxy;
 544   dhcp_server_t *server;
 545   vnet_main_t * vnm = vnet_get_main();
 546   int bogus_length;
 547
 548   from = vlib_frame_vector_args (from_frame);
 549   n_left_from = from_frame->n_vectors;
 550
 551   while (n_left_from > 0)
 552     {
 553       u32 bi0;
 554       vlib_buffer_t * b0;
 555       udp_header_t * u0, *u1=0;
 556       dhcpv6_relay_hdr_t * h0;
 557       ip6_header_t * ip1 = 0, *ip0;
 558       ip6_address_t _ia0, * ia0 = &_ia0;
 559       ip6_address_t client_address;
 560       ethernet_interface_t *ei0;
 561       ethernet_header_t *mac0;
 562       vnet_hw_interface_t *hi0;
 563       vlib_frame_t *f0;
 564       u32 * to_next0;
 565       u32 sw_if_index = ~0;
 566       u32 original_sw_if_index = ~0;
 567       vnet_sw_interface_t *si0;
 568       u32 error0 = (u32)~0;
 569       vnet_sw_interface_t *swif;
 570       dhcpv6_option_t *r0 = 0, *o;
 571       u16 len = 0;
 572       u8 interface_opt_flag = 0;
 573       u8 relay_msg_opt_flag = 0;
 574       ip6_main_t * im = &ip6_main;
 575       u32 server_fib_idx, client_fib_idx;
 576
 577       bi0 = from[0];
 578       from += 1;
 579       n_left_from -= 1;
 580
 581       b0 = vlib_get_buffer (vm, bi0);
 582       h0 = vlib_buffer_get_current (b0);
 583
 584       if (DHCPV6_MSG_RELAY_REPL != h0->msg_type)
 585         {
 586           error0 =  DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 587
 588         drop_packet:
 589           vlib_node_increment_counter (vm, dhcpv6_proxy_to_client_node.index,
 590                                        error0, 1);
 591
 592           f0 = vlib_get_frame_to_node (vm, dm->error_drop_node_index);
 593           to_next0 = vlib_frame_vector_args (f0);
 594           to_next0[0] = bi0;
 595           f0->n_vectors = 1;
 596           vlib_put_frame_to_node (vm, dm->error_drop_node_index, f0);
 597           goto do_trace;
 598         }
 599       /* hop count seems not need to be checked */
 600       if (HOP_COUNT_LIMIT < h0->hop_count)
 601         {
 602           error0 =  DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 603           goto drop_packet;
 604         }
 605       u0 = (void *)h0 -(sizeof(*u0));
 606       ip0 = (void *)u0 -(sizeof(*ip0));
 607
 608       vlib_buffer_advance (b0, sizeof(*h0));
 609       o = vlib_buffer_get_current (b0);
 610
 611       /* Parse through TLVs looking for option 18 (DHCPV6_OPTION_INTERFACE_ID)
 612          _and_ option 9 (DHCPV6_OPTION_RELAY_MSG) option which must be there.
 613          Currently assuming no other options need to be processed
 614          The interface-ID is the FIB number we need
 615          to track down the client-facing interface */
 616
 617       while ((u8 *) o < (b0->data + b0->current_data + b0->current_length))
 618         {
 619            if (DHCPV6_OPTION_INTERFACE_ID == clib_net_to_host_u16(o->option))
 620              {
 621                 interface_opt_flag = 1;
 622                 if (clib_net_to_host_u16(o->length) == sizeof(sw_if_index))
 623                     sw_if_index = clib_net_to_host_u32(((dhcpv6_int_id_t*)o)->int_idx);
 624                 if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
 625                   {
 626                     error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION;
 627                     goto drop_packet;
 628                   }
 629              }
 630            if (DHCPV6_OPTION_RELAY_MSG == clib_net_to_host_u16(o->option))
 631              {
 632                 relay_msg_opt_flag = 1;
 633                 r0 = vlib_buffer_get_current (b0);
 634              }
 635            if ((relay_msg_opt_flag == 1) && (interface_opt_flag == 1))
 636              break;
 637            vlib_buffer_advance (b0, sizeof(*o) + clib_net_to_host_u16(o->length));
 638            o = (dhcpv6_option_t *) (((uword) o) + clib_net_to_host_u16(o->length) + sizeof(*o));
 639         }
 640
 641       if ((relay_msg_opt_flag == 0) || (r0 == 0))
 642         {
 643           error0 = DHCPV6_PROXY_ERROR_NO_RELAY_MESSAGE_OPTION;
 644           goto drop_packet;
 645         }
 646
 647       if ((u32)~0 == sw_if_index)
 648         {
 649           error0 = DHCPV6_PROXY_ERROR_NO_CIRCUIT_ID_OPTION;
 650           goto drop_packet;
 651         }
 652
 653       //Advance buffer to start of encapsulated DHCPv6 message
 654       vlib_buffer_advance (b0, sizeof(*r0));
 655
 656       client_fib_idx = im->mfib_index_by_sw_if_index[sw_if_index];
 657       proxy = dhcp_get_proxy(dm, client_fib_idx, FIB_PROTOCOL_IP6);
 658
 659       if (NULL == proxy)
 660       {
 661           error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 662           goto drop_packet;
 663       }
 664
 665       server_fib_idx = im->fib_index_by_sw_if_index
 666           [vnet_buffer(b0)->sw_if_index[VLIB_RX]];
 667
 668       vec_foreach(server, proxy->dhcp_servers)
 669       {
 670           if (server_fib_idx == server->server_fib_index &&
 671               ip0->src_address.as_u64[0] == server->dhcp_server.ip6.as_u64[0] &&
 672               ip0->src_address.as_u64[1] == server->dhcp_server.ip6.as_u64[1])
 673           {
 674               goto server_found;
 675           }
 676       }
 677
 678       //drop packet if not from server with configured address or FIB
 679       error0 = DHCPV6_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
 680       goto drop_packet;
 681
 682     server_found:
 683       vnet_buffer (b0)->sw_if_index[VLIB_TX] = original_sw_if_index
 684           = sw_if_index;
 685
 686       swif = vnet_get_sw_interface (vnm, original_sw_if_index);
 687       if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 688           sw_if_index = swif->unnumbered_sw_if_index;
 689
 690
 691       /*
 692        * udp_local hands us the DHCPV6 header, need udp hdr,
 693        * ip hdr to relay to client
 694        */
 695       vlib_buffer_advance (b0, -(sizeof(*u1)));
 696       u1 = vlib_buffer_get_current (b0);
 697
 698       vlib_buffer_advance (b0, -(sizeof(*ip1)));
 699       ip1 = vlib_buffer_get_current (b0);
 700
 701       copy_ip6_address(&client_address, &h0->peer_addr);
 702
 703       ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
 704       if (ia0 == 0)
 705         {
 706           error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 707           goto drop_packet;
 708         }
 709
 710       len =  clib_net_to_host_u16(r0->length);
 711       memset(ip1, 0, sizeof(*ip1));
 712       copy_ip6_address(&ip1->dst_address, &client_address);
 713       u1->checksum = 0;
 714       u1->src_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_server);
 715       u1->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_client);
 716       u1->length = clib_host_to_net_u16 (len + sizeof(udp_header_t));
 717
 718       ip1->ip_version_traffic_class_and_flow_label =
 719           ip0->ip_version_traffic_class_and_flow_label &
 720           0x00000fff;
 721       ip1->payload_length =  u1->length;
 722       ip1->protocol = PROTO_UDP;
 723       ip1->hop_limit = HOP_COUNT_LIMIT;
 724       copy_ip6_address(&ip1->src_address, ia0);
 725
 726       u1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, ip1,
 727                                                        &bogus_length);
 728       ASSERT(bogus_length == 0);
 729
 730       vlib_buffer_advance (b0, -(sizeof(ethernet_header_t)));
 731       si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
 732       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 733           vlib_buffer_advance (b0, -4 /* space for VLAN tag */);
 734
 735       mac0 = vlib_buffer_get_current (b0);
 736
 737       hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
 738       ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
 739       clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
 740       memset (&mac0->dst_address, 0xff, sizeof (mac0->dst_address));
 741       mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
 742         clib_net_to_host_u16(0x8100) : clib_net_to_host_u16 (0x86dd);
 743
 744       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 745         {
 746           u32 * vlan_tag = (u32 *)(mac0+1);
 747           u32 tmp;
 748           tmp = (si0->sub.id << 16) | 0x0800;
 749           *vlan_tag = clib_host_to_net_u32 (tmp);
 750         }
 751
 752       /* $$$ consider adding a dynamic next to the graph node, for performance */
 753       f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
 754       to_next0 = vlib_frame_vector_args (f0);
 755       to_next0[0] = bi0;
 756       f0->n_vectors = 1;
 757       vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
 758
 759     do_trace:
 760       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 761         {
 762           dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 763                                                      b0, sizeof (*tr));
 764           tr->which = 1; /* to client */
 765           if (ia0)
 766               copy_ip6_address((ip6_address_t*)tr->packet_data, ia0);
 767           tr->error = error0;
 768           tr->original_sw_if_index = original_sw_if_index;
 769           tr->sw_if_index = sw_if_index;
 770         }
 771     }
 772   return from_frame->n_vectors;
 773
 774 }
 775
 776 VLIB_REGISTER_NODE (dhcpv6_proxy_to_client_node, static) = {
 777   .function = dhcpv6_proxy_to_client_input,
 778   .name = "dhcpv6-proxy-to-client",
 779   /* Takes a vector of packets. */
 780   .vector_size = sizeof (u32),
 781
 782   .n_errors = DHCPV6_PROXY_N_ERROR,
 783   .error_strings = dhcpv6_proxy_error_strings,
 784   .format_buffer = format_dhcpv6_proxy_header_with_length,
 785   .format_trace = format_dhcpv6_proxy_trace,
 786 #if 0
 787   .unformat_buffer = unformat_dhcpv6_proxy_header,
 788 #endif
 789 };
 790
 791 static clib_error_t *
 792 dhcp6_proxy_init (vlib_main_t * vm)
 793 {
 794   dhcp_proxy_main_t * dm = &dhcp_proxy_main;
 795   vlib_node_t * error_drop_node;
 796
 797   error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
 798   dm->error_drop_node_index = error_drop_node->index;
 799
 800   /* RFC says this is the dhcpv6 server address  */
 801   all_dhcpv6_server_address.as_u64[0] = clib_host_to_net_u64 (0xFF05000000000000);
 802   all_dhcpv6_server_address.as_u64[1] = clib_host_to_net_u64 (0x00010003);
 803
 804   /* RFC says this is the server and agent address */
 805   all_dhcpv6_server_relay_agent_address.as_u64[0] = clib_host_to_net_u64 (0xFF02000000000000);
 806   all_dhcpv6_server_relay_agent_address.as_u64[1] = clib_host_to_net_u64 (0x00010002);
 807
 808   udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 809                          dhcpv6_proxy_to_client_node.index, 0 /* is_ip6 */);
 810
 811   udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
 812                          dhcpv6_proxy_to_server_node.index, 0 /* is_ip6 */);
 813
 814   return 0;
 815 }
 816
 817 VLIB_INIT_FUNCTION (dhcp6_proxy_init);
 818
 819 int
 820 dhcp6_proxy_set_server (ip46_address_t *addr,
 821                         ip46_address_t *src_addr,
 822                         u32 rx_table_id,
 823                         u32 server_table_id,
 824                         int is_del)
 825 {
 826   u32 rx_fib_index = 0;
 827   int rc = 0;
 828
 829   const mfib_prefix_t all_dhcp_servers = {
 830       .fp_len = 128,
 831       .fp_proto = FIB_PROTOCOL_IP6,
 832       .fp_grp_addr = {
 833           .ip6 = all_dhcpv6_server_relay_agent_address,
 834       }
 835   };
 836
 837   if (ip46_address_is_zero(addr))
 838     return VNET_API_ERROR_INVALID_DST_ADDRESS;
 839
 840   if (ip46_address_is_zero(src_addr))
 841     return VNET_API_ERROR_INVALID_SRC_ADDRESS;
 842
 843   rx_fib_index = mfib_table_find_or_create_and_lock(FIB_PROTOCOL_IP6,
 844                                                     rx_table_id,
 845                                                     MFIB_SOURCE_DHCP);
 846
 847   if (is_del)
 848     {
 849       if (dhcp_proxy_server_del (FIB_PROTOCOL_IP6, rx_fib_index,
 850                                  addr, server_table_id))
 851       {
 852           mfib_table_entry_delete(rx_fib_index,
 853                                   &all_dhcp_servers,
 854                                   MFIB_SOURCE_DHCP);
 855           mfib_table_unlock(rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 856       }
 857     }
 858   else
 859     {
 860      const fib_route_path_t path_for_us = {
 861           .frp_proto = DPO_PROTO_IP6,
 862           .frp_addr = zero_addr,
 863           .frp_sw_if_index = 0xffffffff,
 864           .frp_fib_index = ~0,
 865           .frp_weight = 0,
 866           .frp_flags = FIB_ROUTE_PATH_LOCAL,
 867       };
 868      if (dhcp_proxy_server_add (FIB_PROTOCOL_IP6, addr, src_addr,
 869                                 rx_fib_index, server_table_id))
 870      {
 871          mfib_table_entry_path_update(rx_fib_index,
 872                                       &all_dhcp_servers,
 873                                       MFIB_SOURCE_DHCP,
 874                                       &path_for_us,
 875                                       MFIB_ITF_FLAG_FORWARD);
 876          /*
 877           * Each interface that is enabled in this table, needs to be added
 878           * as an accepting interface, but this is not easily doable in VPP.
 879           * So we cheat. Add a flag to the entry that indicates accept form
 880           * any interface.
 881           * We will still only accept on v6 enabled interfaces, since the
 882           * input feature ensures this.
 883           */
 884          mfib_table_entry_update(rx_fib_index,
 885                                  &all_dhcp_servers,
 886                                  MFIB_SOURCE_DHCP,
 887                                  MFIB_RPF_ID_NONE,
 888                                  MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF);
 889          mfib_table_lock(rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 890      }
 891     }
 892
 893   mfib_table_unlock(rx_fib_index, FIB_PROTOCOL_IP6, MFIB_SOURCE_DHCP);
 894
 895   return (rc);
 896 }
 897
 898 static clib_error_t *
 899 dhcpv6_proxy_set_command_fn (vlib_main_t * vm,
 900                            unformat_input_t * input,
 901                            vlib_cli_command_t * cmd)
 902 {
 903   ip46_address_t addr, src_addr;
 904   int set_server = 0, set_src_address = 0;
 905   u32 rx_table_id = 0, server_table_id = 0;
 906   int is_del = 0;
 907
 908   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
 909     {
 910       if (unformat (input, "server %U",
 911                     unformat_ip6_address, &addr.ip6))
 912          set_server = 1;
 913       else if (unformat(input, "src-address %U",
 914                         unformat_ip6_address, &src_addr.ip6))
 915           set_src_address =1;
 916        else if (unformat (input, "server-fib-id %d", &server_table_id))
 917         ;
 918        else if (unformat (input, "rx-fib-id %d", &rx_table_id))
 919          ;
 920        else if (unformat (input, "delete") ||
 921                 unformat (input, "del"))
 922            is_del = 1;
 923       else
 924         break;
 925     }
 926
 927   if (is_del || (set_server && set_src_address))
 928   {
 929       int rv;
 930
 931       rv = dhcp6_proxy_set_server (&addr, &src_addr, rx_table_id,
 932                                    server_table_id, is_del);
 933
 934       //TODO: Complete the errors
 935       switch (rv)
 936         {
 937         case 0:
 938           return 0;
 939
 940         case VNET_API_ERROR_INVALID_DST_ADDRESS:
 941           return clib_error_return (0, "Invalid server address");
 942
 943         case VNET_API_ERROR_INVALID_SRC_ADDRESS:
 944           return clib_error_return (0, "Invalid src address");
 945
 946         case VNET_API_ERROR_NO_SUCH_ENTRY:
 947           return clib_error_return
 948             (0, "Fib id %d: no per-fib DHCP server configured", rx_table_id);
 949
 950         default:
 951           return clib_error_return (0, "BUG: rv %d", rv);
 952         }
 953   }
 954   else
 955     return clib_error_return (0, "parse error`%U'",
 956                               format_unformat_error, input);
 957 }
 958
 959 VLIB_CLI_COMMAND (dhcpv6_proxy_set_command, static) = {
 960   .path = "set dhcpv6 proxy",
 961   .short_help = "set dhcpv6 proxy [del] server <ipv6-addr> src-address <ipv6-addr> "
 962                   "[server-fib-id <fib-id>] [rx-fib-id <fib-id>] ",
 963   .function = dhcpv6_proxy_set_command_fn,
 964 };
 965
 966 static u8 *
 967 format_dhcp6_proxy_server (u8 * s, va_list * args)
 968 {
 969   dhcp_proxy_t * proxy = va_arg (*args, dhcp_proxy_t *);
 970   fib_table_t *server_fib;
 971   dhcp_server_t *server;
 972   ip6_mfib_t *rx_fib;
 973
 974   if (proxy == 0)
 975     {
 976         s = format (s, "%=14s%=16s%s", "RX FIB", "Src Address",
 977                     "Servers FIB,Address");
 978       return s;
 979     }
 980
 981   rx_fib = ip6_mfib_get(proxy->rx_fib_index);
 982
 983   s = format (s, "%=14u%=16U",
 984               rx_fib->table_id,
 985               format_ip46_address, &proxy->dhcp_src_address, IP46_TYPE_ANY);
 986
 987   vec_foreach(server, proxy->dhcp_servers)
 988   {
 989       server_fib = fib_table_get(server->server_fib_index,
 990                                  FIB_PROTOCOL_IP6);
 991       s = format (s, "%u,%U  ",
 992                   server_fib->ft_table_id,
 993                   format_ip46_address, &server->dhcp_server, IP46_TYPE_ANY);
 994   }
 995
 996   return s;
 997 }
 998
 999 static int
1000 dhcp6_proxy_show_walk (dhcp_proxy_t *proxy,
1001                        void *ctx)
1002 {
1003     vlib_main_t * vm = ctx;
1004
1005     vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, proxy);
1006
1007     return (1);
1008 }
1009
1010 static clib_error_t *
1011 dhcpv6_proxy_show_command_fn (vlib_main_t * vm,
1012                               unformat_input_t * input,
1013                               vlib_cli_command_t * cmd)
1014 {
1015   vlib_cli_output (vm, "%U", format_dhcp6_proxy_server, NULL /* header line */);
1016
1017   dhcp_proxy_walk(FIB_PROTOCOL_IP6, dhcp6_proxy_show_walk, vm);
1018
1019   return (NULL);
1020 }
1021
1022 VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = {
1023   .path = "show dhcpv6 proxy",
1024   .short_help = "Display dhcpv6 proxy info",
1025   .function = dhcpv6_proxy_show_command_fn,
1026 };
1027
1028 static clib_error_t *
1029 dhcpv6_vss_command_fn (vlib_main_t * vm,
1030                        unformat_input_t * input,
1031                        vlib_cli_command_t * cmd)
1032 {
1033   int is_del = 0, got_new_vss=0;
1034   u32 oui=0;
1035   u32 fib_id=0, tbl_id=~0;
1036
1037   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
1038     {
1039       if (unformat (input, "oui %d", &oui))
1040           got_new_vss = 1;
1041       else if (unformat (input, "vpn-id %d", &fib_id))
1042           got_new_vss = 1;
1043       else if (unformat (input, "table %d", &tbl_id))
1044           got_new_vss = 1;
1045       else if (unformat(input, "delete") || unformat(input, "del"))
1046           is_del = 1;
1047       else
1048           break;
1049     }
1050
1051   if (tbl_id ==~0)
1052       return clib_error_return (0, "no table ID specified.");
1053
1054   if (is_del || got_new_vss)
1055     {
1056       int rv;
1057
1058       rv = dhcp_proxy_set_vss(FIB_PROTOCOL_IP6, tbl_id, oui, fib_id, is_del);
1059       switch (rv)
1060         {
1061         case 0:
1062           return 0;
1063
1064         case VNET_API_ERROR_NO_SUCH_FIB:
1065             return clib_error_return (0, "vss info (oui:%d, vpn-id:%d)  not found in table %d.",
1066                                       oui, fib_id, tbl_id);
1067
1068         case VNET_API_ERROR_NO_SUCH_ENTRY:
1069             return clib_error_return (0, "vss for table %d not found in pool.",
1070                                       tbl_id);
1071
1072         default:
1073           return clib_error_return (0, "BUG: rv %d", rv);
1074         }
1075     }
1076   else
1077       return clib_error_return (0, "parse error`%U'",
1078                                 format_unformat_error, input);
1079
1080 }
1081
1082 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_command, static) = {
1083   .path = "set dhcpv6 vss",
1084   .short_help = "set dhcpv6 vss table <table-id> oui <oui> vpn-idx <vpn-idx>",
1085   .function = dhcpv6_vss_command_fn,
1086 };
1087
1088 static clib_error_t *
1089 dhcpv6_vss_show_command_fn (vlib_main_t * vm,
1090                             unformat_input_t * input,
1091                             vlib_cli_command_t * cmd)
1092
1093 {
1094   dhcp_vss_walk(FIB_PROTOCOL_IP6, dhcp_vss_show_walk, vm);
1095
1096   return (NULL);
1097 }
1098
1099 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_show_command, static) = {
1100   .path = "show dhcpv6 vss",
1101   .short_help = "show dhcpv6 VSS",
1102   .function = dhcpv6_vss_show_command_fn,
1103 };
1104
1105 static clib_error_t *
1106 dhcpv6_link_address_show_command_fn (vlib_main_t * vm,
1107                                 unformat_input_t * input,
1108                                 vlib_cli_command_t * cmd)
1109
1110 {
1111   vnet_main_t *vnm = vnet_get_main();
1112   u32 sw_if_index0=0, sw_if_index;
1113   vnet_sw_interface_t *swif;
1114   ip6_address_t *ia0;
1115
1116   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
1117     {
1118
1119       if (unformat(input, "%U",
1120                    unformat_vnet_sw_interface, vnm, &sw_if_index0))
1121         {
1122             swif = vnet_get_sw_interface (vnm, sw_if_index0);
1123             sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1124                 swif->unnumbered_sw_if_index : sw_if_index0;
1125             ia0 = ip6_interface_first_address(&ip6_main, sw_if_index);
1126             if (ia0)
1127               {
1128                   vlib_cli_output (vm, "%=20s%=48s", "interface", "link-address");
1129
1130                   vlib_cli_output (vm, "%=20U%=48U",
1131                                    format_vnet_sw_if_index_name, vnm, sw_if_index0,
1132                                    format_ip6_address, ia0);
1133               } else
1134                 vlib_cli_output (vm, "%=34s%=20U", "No IPv6 address configured on",
1135                                  format_vnet_sw_if_index_name, vnm, sw_if_index);
1136         } else
1137           break;
1138     }
1139
1140   return 0;
1141 }
1142
1143 VLIB_CLI_COMMAND (dhcpv6_proxy_address_show_command, static) = {
1144   .path = "show dhcpv6 link-address interface",
1145   .short_help = "show dhcpv6 link-address interface <interface>",
1146   .function = dhcpv6_link_address_show_command_fn,
1147 };