src/vnet/dhcpv6/proxy_node.c

   1 /*
   2  * 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/dhcpv6/proxy.h>
  21 #include <vnet/fib/ip6_fib.h>
  22 #include <vnet/mfib/mfib_table.h>
  23 #include <vnet/mfib/ip6_mfib.h>
  24
  25 static char * dhcpv6_proxy_error_strings[] = {
  26 #define dhcpv6_proxy_error(n,s) s,
  27 #include "proxy_error.def"
  28 #undef dhcpv6_proxy_error
  29 };
  30
  31 #define foreach_dhcpv6_proxy_to_server_input_next \
  32   _ (DROP, "error-drop")                        \
  33   _ (LOOKUP, "ip6-lookup")                      \
  34   _ (SEND_TO_CLIENT, "dhcpv6-proxy-to-client")
  35
  36
  37 typedef enum {
  38 #define _(s,n) DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s,
  39   foreach_dhcpv6_proxy_to_server_input_next
  40 #undef _
  41   DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
  42 } dhcpv6_proxy_to_server_input_next_t;
  43
  44 typedef struct {
  45   /* 0 => to server, 1 => to client */
  46   int which;
  47   u8 packet_data[64];
  48   u32 error;
  49   u32 sw_if_index;
  50   u32 original_sw_if_index;
  51 } dhcpv6_proxy_trace_t;
  52
  53 vlib_node_registration_t dhcpv6_proxy_to_server_node;
  54 vlib_node_registration_t dhcpv6_proxy_to_client_node;
  55
  56
  57 u8 * format_dhcpv6_proxy_trace (u8 * s, va_list * args)
  58 {
  59   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  60   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  61   dhcpv6_proxy_trace_t * t = va_arg (*args, dhcpv6_proxy_trace_t *);
  62
  63   if (t->which == 0)
  64     s = format (s, "DHCPV6 proxy: sent to server %U",
  65                 format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
  66   else
  67     s = format (s, "DHCPV6 proxy: sent to client from %U",
  68                 format_ip6_address, &t->packet_data, sizeof (ip6_address_t));
  69   if (t->error != (u32)~0)
  70     s = format (s, " error: %s\n", dhcpv6_proxy_error_strings[t->error]);
  71
  72   s = format (s, "  original_sw_if_index: %d, sw_if_index: %d\n",
  73               t->original_sw_if_index, t->sw_if_index);
  74
  75   return s;
  76 }
  77
  78 u8 * format_dhcpv6_proxy_header_with_length (u8 * s, va_list * args)
  79 {
  80   dhcpv6_header_t * h = va_arg (*args, dhcpv6_header_t *);
  81   u32 max_header_bytes = va_arg (*args, u32);
  82   u32 header_bytes;
  83
  84   header_bytes = sizeof (h[0]);
  85   if (max_header_bytes != 0 && header_bytes > max_header_bytes)
  86     return format (s, "dhcpv6 header truncated");
  87
  88   s = format (s, "DHCPV6 Proxy");
  89
  90   return s;
  91 }
  92 /* get first interface address */
  93 static ip6_address_t *
  94 ip6_interface_first_global_or_site_address (ip6_main_t * im, u32 sw_if_index)
  95 {
  96   ip_lookup_main_t * lm = &im->lookup_main;
  97   ip_interface_address_t * ia = 0;
  98   ip6_address_t * result = 0;
  99
 100   foreach_ip_interface_address (lm, ia, sw_if_index,
 101                                 1 /* honor unnumbered */,
 102   ({
 103     ip6_address_t * a = ip_interface_address_get_address (lm, ia);
 104     if ((a->as_u8[0] & 0xe0) == 0x20 ||
 105         (a->as_u8[0] & 0xfe) == 0xfc)  {
 106         result = a;
 107         break;
 108     }
 109   }));
 110   return result;
 111 }
 112
 113 static inline void copy_ip6_address (ip6_address_t *dst, ip6_address_t *src)
 114 {
 115
 116   dst->as_u64[0] = src->as_u64[0];
 117   dst->as_u64[1] = src->as_u64[1];
 118 }
 119
 120 static uword
 121 dhcpv6_proxy_to_server_input (vlib_main_t * vm,
 122                             vlib_node_runtime_t * node,
 123                             vlib_frame_t * from_frame)
 124 {
 125   u32 n_left_from, next_index, * from, * to_next;
 126   dhcpv6_proxy_main_t * dpm = &dhcpv6_proxy_main;
 127   from = vlib_frame_vector_args (from_frame);
 128   n_left_from = from_frame->n_vectors;
 129   u32 pkts_to_server=0, pkts_to_client=0, pkts_no_server=0;
 130   u32 pkts_no_interface_address=0, pkts_no_exceeding_max_hop=0;
 131   u32 pkts_no_src_address=0;
 132   u32 pkts_wrong_msg_type=0;
 133   u32 pkts_too_big=0;
 134   ip6_main_t * im = &ip6_main;
 135   ip6_fib_t * fib;
 136   ip6_address_t * src;
 137   int bogus_length;
 138   dhcpv6_server_t * server;
 139   u32  rx_fib_idx = 0, server_fib_idx = 0;
 140   u32 server_idx;
 141   u32 fib_id1 = 0;
 142
 143   next_index = node->cached_next_index;
 144
 145   while (n_left_from > 0)
 146     {
 147       u32 n_left_to_next;
 148
 149       vlib_get_next_frame (vm, node, next_index,
 150                            to_next, n_left_to_next);
 151
 152       while (n_left_from > 0 && n_left_to_next > 0)
 153         {
 154           vnet_main_t *vnm = vnet_get_main();
 155           u32 sw_if_index = 0;
 156           u32 rx_sw_if_index = 0;
 157           vnet_sw_interface_t *swif;
 158           u32 bi0;
 159           vlib_buffer_t * b0;
 160           udp_header_t * u0, *u1;
 161           dhcpv6_header_t * h0;  // client msg hdr
 162           ip6_header_t * ip0, *ip1;
 163           ip6_address_t _ia0, *ia0=&_ia0;
 164           u32 next0;
 165           u32 error0 = (u32) ~0;
 166           dhcpv6_option_t *fwd_opt;
 167           dhcpv6_relay_hdr_t *r1;
 168           u16 len;
 169           dhcpv6_int_id_t *id1;
 170           dhcpv6_vss_t *vss1;
 171           dhcpv6_client_mac_t *cmac; // client mac
 172           ethernet_header_t * e_h0;
 173           u8 client_src_mac[6];
 174           vlib_buffer_free_list_t *fl;
 175
 176           uword *p_vss;
 177           u32  oui1=0;
 178           dhcpv6_vss_info *vss;
 179
 180
 181           bi0 = from[0];
 182           to_next[0] = bi0;
 183           from += 1;
 184           to_next += 1;
 185           n_left_from -= 1;
 186           n_left_to_next -= 1;
 187
 188           b0 = vlib_get_buffer (vm, bi0);
 189
 190           h0 = vlib_buffer_get_current (b0);
 191
 192           /*
 193            * udp_local hands us the DHCPV6 header.
 194            */
 195           u0 = (void *)h0 -(sizeof(*u0));
 196           ip0 = (void *)u0 -(sizeof(*ip0));
 197           e_h0 = (void *)ip0 - ethernet_buffer_header_size(b0);
 198
 199           clib_memcpy(client_src_mac, e_h0->src_address, 6);
 200
 201           switch (h0->u.msg_type) {
 202             case DHCPV6_MSG_SOLICIT:
 203             case DHCPV6_MSG_REQUEST:
 204             case DHCPV6_MSG_CONFIRM:
 205             case DHCPV6_MSG_RENEW:
 206             case DHCPV6_MSG_REBIND:
 207             case DHCPV6_MSG_RELEASE:
 208             case DHCPV6_MSG_DECLINE:
 209             case DHCPV6_MSG_INFORMATION_REQUEST:
 210             case DHCPV6_MSG_RELAY_FORW:
 211                 /* send to server */
 212                 break;
 213             case DHCPV6_MSG_RELAY_REPL:
 214                 /* send to client */
 215                 next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_SEND_TO_CLIENT;
 216                 error0 = 0;
 217                 pkts_to_client++;
 218                 goto do_enqueue;
 219             default:
 220                 /* drop the packet */
 221                 pkts_wrong_msg_type++;
 222                 error0 = DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 223                 next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 224                 goto do_trace;
 225
 226           }
 227
 228           /* Send to DHCPV6 server via the configured FIB */
 229           rx_sw_if_index = sw_if_index =  vnet_buffer(b0)->sw_if_index[VLIB_RX];
 230           rx_fib_idx = im->fib_index_by_sw_if_index [rx_sw_if_index];
 231
 232           if (vec_len(dpm->dhcp6_server_index_by_rx_fib_index) <= rx_fib_idx)
 233             goto no_server;
 234
 235           server_idx = dpm->dhcp6_server_index_by_rx_fib_index[rx_fib_idx];
 236
 237           if (PREDICT_FALSE (pool_is_free_index (dpm->dhcp6_servers,
 238                                                           server_idx)))
 239                      {
 240                      no_server:
 241                        error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 242                        next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 243                        pkts_no_server++;
 244                        goto do_trace;
 245                      }
 246
 247           server = pool_elt_at_index(dpm->dhcp6_servers, server_idx);
 248           if (server->valid == 0)
 249             goto no_server;
 250
 251           server_fib_idx = server->server_fib6_index;
 252           vnet_buffer(b0)->sw_if_index[VLIB_TX] = server_fib_idx;
 253
 254
 255           /* relay-option header pointer */
 256           vlib_buffer_advance(b0, -(sizeof(*fwd_opt)));
 257           fwd_opt = vlib_buffer_get_current(b0);
 258           /* relay message header pointer */
 259           vlib_buffer_advance(b0, -(sizeof(*r1)));
 260           r1 = vlib_buffer_get_current(b0);
 261
 262           vlib_buffer_advance(b0, -(sizeof(*u1)));
 263           u1 = vlib_buffer_get_current(b0);
 264
 265           vlib_buffer_advance(b0, -(sizeof(*ip1)));
 266           ip1 = vlib_buffer_get_current(b0);
 267
 268           /* fill in all that rubbish... */
 269           len = clib_net_to_host_u16(u0->length) - sizeof(udp_header_t);
 270           copy_ip6_address(&r1->peer_addr, &ip0->src_address);
 271
 272           r1->msg_type = DHCPV6_MSG_RELAY_FORW;
 273           fwd_opt->length = clib_host_to_net_u16(len);
 274           fwd_opt->option = clib_host_to_net_u16(DHCPV6_OPTION_RELAY_MSG);
 275
 276           r1->hop_count++;
 277           r1->hop_count = (h0->u.msg_type != DHCPV6_MSG_RELAY_FORW) ? 0 : r1->hop_count;
 278
 279           if (PREDICT_FALSE(r1->hop_count >= HOP_COUNT_LIMIT))
 280             {
 281               error0 =  DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 282               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 283               pkts_no_exceeding_max_hop++;
 284               goto do_trace;
 285             }
 286
 287
 288           /* If relay-fwd and src address is site or global unicast address  */
 289           if (h0->u.msg_type == DHCPV6_MSG_RELAY_FORW &&
 290               ((ip0->src_address.as_u8[0] & 0xe0) == 0x20 ||
 291                (ip0->src_address.as_u8[0] & 0xfe) == 0xfc))
 292             {
 293               /* Set link address to zero */
 294               r1->link_addr.as_u64[0] = 0;
 295               r1->link_addr.as_u64[1] = 0;
 296               goto link_address_set;
 297             }
 298
 299           /* if receiving interface is unnumbered, use receiving interface
 300            * IP address as link address, otherwise use the loopback interface
 301            * IP address as link address.
 302            */
 303
 304           swif = vnet_get_sw_interface (vnm, rx_sw_if_index);
 305           if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 306               sw_if_index = swif->unnumbered_sw_if_index;
 307
 308           ia0 = ip6_interface_first_global_or_site_address(&ip6_main, sw_if_index);
 309           if (ia0 == 0)
 310             {
 311               error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 312               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 313               pkts_no_interface_address++;
 314               goto do_trace;
 315             }
 316
 317           copy_ip6_address(&r1->link_addr, ia0);
 318
 319         link_address_set:
 320           fl = vlib_buffer_get_free_list (vm, b0->free_list_index);
 321
 322           if ((b0->current_length+sizeof(*id1)+sizeof(*vss1)+sizeof(*cmac))
 323               > fl->n_data_bytes)
 324             {
 325               error0 = DHCPV6_PROXY_ERROR_PKT_TOO_BIG;
 326               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 327               pkts_too_big++;
 328               goto do_trace;
 329             }
 330
 331           id1 = (dhcpv6_int_id_t *) (((uword) ip1) + b0->current_length);
 332           b0->current_length += (sizeof (*id1));
 333
 334
 335           fib = ip6_fib_get (rx_fib_idx);
 336
 337           //TODO: Revisit if hash makes sense here
 338           p_vss = hash_get (dpm->vss_index_by_vrf_id,
 339                             fib->table_id);
 340           if (p_vss)
 341             {
 342               vss = pool_elt_at_index (dpm->vss, p_vss[0]);
 343               oui1 =  vss->vpn_id.oui;
 344               fib_id1 =  vss->vpn_id.fib_id;
 345             }
 346
 347           id1->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_INTERFACE_ID);
 348           id1->opt.length = clib_host_to_net_u16(sizeof(rx_sw_if_index));
 349           id1->int_idx = clib_host_to_net_u32(rx_sw_if_index);
 350
 351           u1->length =0;
 352           if (h0->u.msg_type != DHCPV6_MSG_RELAY_FORW)
 353             {
 354                cmac = (dhcpv6_client_mac_t *) (((uword) ip1) + b0->current_length);
 355                b0->current_length += (sizeof (*cmac));
 356                cmac->opt.length =clib_host_to_net_u16(sizeof(*cmac) -
 357                                                       sizeof(cmac->opt));
 358                cmac->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_CLIENT_LINK_LAYER_ADDRESS);
 359                cmac->link_type = clib_host_to_net_u16(1); // ethernet
 360                clib_memcpy(cmac->data, client_src_mac, 6);
 361                u1->length += sizeof(*cmac);
 362             }
 363           if (server->insert_vss !=0 ) {
 364               vss1 = (dhcpv6_vss_t *) (((uword) ip1) + b0->current_length);
 365               b0->current_length += (sizeof (*vss1));
 366               vss1->opt.length =clib_host_to_net_u16(sizeof(*vss1) -
 367                                                      sizeof(vss1->opt));
 368               vss1->opt.option = clib_host_to_net_u16(DHCPV6_OPTION_VSS);
 369               vss1->data[0] = 1;   // type
 370               vss1->data[1] = oui1>>16 & 0xff;
 371               vss1->data[2] = oui1>>8  & 0xff;
 372               vss1->data[3] = oui1 & 0xff;
 373               vss1->data[4] = fib_id1>>24 & 0xff;
 374               vss1->data[5] = fib_id1>>16 & 0xff;
 375               vss1->data[6] = fib_id1>>8 & 0xff;
 376               vss1->data[7] = fib_id1 & 0xff;
 377               u1->length += sizeof(*vss1);
 378           }
 379
 380           pkts_to_server++;
 381           u1->checksum = 0;
 382           u1->src_port = clib_host_to_net_u16(UDP_DST_PORT_dhcpv6_to_client);
 383           u1->dst_port = clib_host_to_net_u16(UDP_DST_PORT_dhcpv6_to_server);
 384
 385           u1->length =
 386               clib_host_to_net_u16( clib_net_to_host_u16(fwd_opt->length) +
 387                                     sizeof(*r1) + sizeof(*fwd_opt) +
 388                                     sizeof(*u1) + sizeof(*id1) + u1->length);
 389
 390           memset(ip1, 0, sizeof(*ip1));
 391           ip1->ip_version_traffic_class_and_flow_label = 0x60;
 392           ip1->payload_length =  u1->length;
 393           ip1->protocol = PROTO_UDP;
 394           ip1->hop_limit = HOP_COUNT_LIMIT;
 395               src = (server->dhcp6_server.as_u64[0] || server->dhcp6_server.as_u64[1]) ?
 396                 &server->dhcp6_server : &dpm->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 = (server->dhcp6_src_address.as_u64[0] || server->dhcp6_src_address.as_u64[1]) ?
 404                 &server->dhcp6_src_address : ia0;
 405           if (ia0 == 0)
 406             {
 407               error0 = DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS;
 408               next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_DROP;
 409               pkts_no_src_address++;
 410               goto do_trace;
 411             }
 412
 413           copy_ip6_address (&ip1->src_address, src);
 414
 415
 416           u1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, ip1,
 417                                                            &bogus_length);
 418           ASSERT(bogus_length == 0);
 419
 420           next0 = DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP;
 421
 422         do_trace:
 423           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 424             {
 425                dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 426                                                           b0, sizeof (*tr));
 427                tr->which = 0; /* to server */
 428                tr->error = error0;
 429                tr->original_sw_if_index = rx_sw_if_index;
 430                tr->sw_if_index = sw_if_index;
 431                if (DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_LOOKUP == next0)
 432                  copy_ip6_address((ip6_address_t *)&tr->packet_data[0], &server->dhcp6_server);
 433             }
 434
 435         do_enqueue:
 436           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 437                                            to_next, n_left_to_next,
 438                                            bi0, next0);
 439         }
 440
 441       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 442     }
 443
 444   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 445                                DHCPV6_PROXY_ERROR_RELAY_TO_CLIENT,
 446                                pkts_to_client);
 447   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 448                                DHCPV6_PROXY_ERROR_RELAY_TO_SERVER,
 449                                pkts_to_server);
 450   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 451                                DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS,
 452                                pkts_no_interface_address);
 453   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 454                                DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE,
 455                                pkts_wrong_msg_type);
 456   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 457                                DHCPV6_PROXY_ERROR_NO_SRC_ADDRESS,
 458                                pkts_no_src_address);
 459   vlib_node_increment_counter (vm, dhcpv6_proxy_to_server_node.index,
 460                                DHCPV6_PROXY_ERROR_PKT_TOO_BIG,
 461                                pkts_too_big);
 462   return from_frame->n_vectors;
 463 }
 464
 465 VLIB_REGISTER_NODE (dhcpv6_proxy_to_server_node) = {
 466   .function = dhcpv6_proxy_to_server_input,
 467   .name = "dhcpv6-proxy-to-server",
 468   /* Takes a vector of packets. */
 469   .vector_size = sizeof (u32),
 470
 471   .n_errors = DHCPV6_PROXY_N_ERROR,
 472   .error_strings = dhcpv6_proxy_error_strings,
 473
 474   .n_next_nodes = DHCPV6_PROXY_TO_SERVER_INPUT_N_NEXT,
 475   .next_nodes = {
 476 #define _(s,n) [DHCPV6_PROXY_TO_SERVER_INPUT_NEXT_##s] = n,
 477     foreach_dhcpv6_proxy_to_server_input_next
 478 #undef _
 479   },
 480
 481   .format_buffer = format_dhcpv6_proxy_header_with_length,
 482   .format_trace = format_dhcpv6_proxy_trace,
 483 #if 0
 484   .unformat_buffer = unformat_dhcpv6_proxy_header,
 485 #endif
 486 };
 487
 488 static uword
 489 dhcpv6_proxy_to_client_input (vlib_main_t * vm,
 490                             vlib_node_runtime_t * node,
 491                             vlib_frame_t * from_frame)
 492 {
 493
 494   u32 n_left_from, * from;
 495   ethernet_main_t *em = ethernet_get_main (vm);
 496   dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main;
 497   dhcpv6_server_t * server;
 498   vnet_main_t * vnm = vnet_get_main();
 499   int bogus_length;
 500
 501   from = vlib_frame_vector_args (from_frame);
 502   n_left_from = from_frame->n_vectors;
 503
 504   while (n_left_from > 0)
 505     {
 506       u32 bi0;
 507       vlib_buffer_t * b0;
 508       udp_header_t * u0, *u1=0;
 509       dhcpv6_relay_hdr_t * h0;
 510       ip6_header_t * ip1 = 0, *ip0;
 511       ip6_address_t _ia0, * ia0 = &_ia0;
 512       ip6_address_t client_address;
 513       ethernet_interface_t *ei0;
 514       ethernet_header_t *mac0;
 515       vnet_hw_interface_t *hi0;
 516       vlib_frame_t *f0;
 517       u32 * to_next0;
 518       u32 sw_if_index = ~0;
 519       u32 original_sw_if_index = ~0;
 520       vnet_sw_interface_t *si0;
 521       u32 error0 = (u32)~0;
 522       vnet_sw_interface_t *swif;
 523       dhcpv6_option_t *r0 = 0, *o;
 524       u16 len = 0;
 525       u8 interface_opt_flag = 0;
 526       u8 relay_msg_opt_flag = 0;
 527       ip6_fib_t * svr_fib;
 528       ip6_main_t * im = &ip6_main;
 529       u32 server_fib_idx, svr_fib_id, client_fib_idx, server_idx;
 530
 531       bi0 = from[0];
 532       from += 1;
 533       n_left_from -= 1;
 534
 535       b0 = vlib_get_buffer (vm, bi0);
 536       h0 = vlib_buffer_get_current (b0);
 537
 538       if (DHCPV6_MSG_RELAY_REPL != h0->msg_type)
 539         {
 540           error0 =  DHCPV6_PROXY_ERROR_WRONG_MESSAGE_TYPE;
 541
 542         drop_packet:
 543           vlib_node_increment_counter (vm, dhcpv6_proxy_to_client_node.index,
 544                                        error0, 1);
 545
 546           f0 = vlib_get_frame_to_node (vm, dm->error_drop_node_index);
 547           to_next0 = vlib_frame_vector_args (f0);
 548           to_next0[0] = bi0;
 549           f0->n_vectors = 1;
 550           vlib_put_frame_to_node (vm, dm->error_drop_node_index, f0);
 551           goto do_trace;
 552         }
 553       /* hop count seems not need to be checked */
 554       if (HOP_COUNT_LIMIT < h0->hop_count)
 555         {
 556           error0 =  DHCPV6_RELAY_PKT_DROP_MAX_HOPS;
 557           goto drop_packet;
 558         }
 559       u0 = (void *)h0 -(sizeof(*u0));
 560       ip0 = (void *)u0 -(sizeof(*ip0));
 561
 562       vlib_buffer_advance (b0, sizeof(*h0));
 563       o = vlib_buffer_get_current (b0);
 564
 565       /* Parse through TLVs looking for option 18 (DHCPV6_OPTION_INTERFACE_ID)
 566          _and_ option 9 (DHCPV6_OPTION_RELAY_MSG) option which must be there.
 567          Currently assuming no other options need to be processed
 568          The interface-ID is the FIB number we need
 569          to track down the client-facing interface */
 570
 571       while ((u8 *) o < (b0->data + b0->current_data + b0->current_length))
 572         {
 573            if (DHCPV6_OPTION_INTERFACE_ID == clib_net_to_host_u16(o->option))
 574              {
 575                 interface_opt_flag = 1;
 576                 if (clib_net_to_host_u16(o->length) == sizeof(sw_if_index))
 577                     sw_if_index = clib_net_to_host_u32(((dhcpv6_int_id_t*)o)->int_idx);
 578                 if (sw_if_index >= vec_len (im->fib_index_by_sw_if_index))
 579                   {
 580                     error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION;
 581                     goto drop_packet;
 582                   }
 583              }
 584            if (DHCPV6_OPTION_RELAY_MSG == clib_net_to_host_u16(o->option))
 585              {
 586                 relay_msg_opt_flag = 1;
 587                 r0 = vlib_buffer_get_current (b0);
 588              }
 589            if ((relay_msg_opt_flag == 1) && (interface_opt_flag == 1))
 590              break;
 591            vlib_buffer_advance (b0, sizeof(*o) + clib_net_to_host_u16(o->length));
 592            o = (dhcpv6_option_t *) (((uword) o) + clib_net_to_host_u16(o->length) + sizeof(*o));
 593         }
 594
 595       if ((relay_msg_opt_flag == 0) || (r0 == 0))
 596         {
 597           error0 = DHCPV6_PROXY_ERROR_NO_RELAY_MESSAGE_OPTION;
 598           goto drop_packet;
 599         }
 600
 601       if ((u32)~0 == sw_if_index)
 602         {
 603           error0 = DHCPV6_PROXY_ERROR_NO_CIRCUIT_ID_OPTION;
 604           goto drop_packet;
 605         }
 606
 607       //Advance buffer to start of encapsulated DHCPv6 message
 608       vlib_buffer_advance (b0, sizeof(*r0));
 609
 610       client_fib_idx = im->fib_index_by_sw_if_index[sw_if_index];
 611       if (client_fib_idx < vec_len(dm->dhcp6_server_index_by_rx_fib_index))
 612           server_idx = dm->dhcp6_server_index_by_rx_fib_index[client_fib_idx];
 613       else
 614           server_idx = 0;
 615
 616       if (PREDICT_FALSE (pool_is_free_index (dm->dhcp6_servers, server_idx)))
 617         {
 618           error0 = DHCPV6_PROXY_ERROR_WRONG_INTERFACE_ID_OPTION;
 619           goto drop_packet;
 620         }
 621
 622       server = pool_elt_at_index (dm->dhcp6_servers, server_idx);
 623       if (server->valid == 0)
 624       {
 625           error0 = DHCPV6_PROXY_ERROR_NO_SERVER;
 626           goto drop_packet;
 627       }
 628
 629
 630       server_fib_idx = im->fib_index_by_sw_if_index
 631           [vnet_buffer(b0)->sw_if_index[VLIB_RX]];
 632       svr_fib = ip6_fib_get (server_fib_idx);
 633       svr_fib_id = svr_fib->table_id;
 634
 635       if (svr_fib_id != server->server_fib6_index ||
 636           ip0->src_address.as_u64[0] != server->dhcp6_server.as_u64[0] ||
 637           ip0->src_address.as_u64[1] != server->dhcp6_server.as_u64[1])
 638         {
 639           //drop packet if not from server with configured address or FIB
 640           error0 = DHCPV6_PROXY_ERROR_BAD_SVR_FIB_OR_ADDRESS;
 641           goto drop_packet;
 642         }
 643
 644       vnet_buffer (b0)->sw_if_index[VLIB_TX] = original_sw_if_index
 645           = sw_if_index;
 646
 647       swif = vnet_get_sw_interface (vnm, original_sw_if_index);
 648       if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
 649           sw_if_index = swif->unnumbered_sw_if_index;
 650
 651
 652       /*
 653        * udp_local hands us the DHCPV6 header, need udp hdr,
 654        * ip hdr to relay to client
 655        */
 656       vlib_buffer_advance (b0, -(sizeof(*u1)));
 657       u1 = vlib_buffer_get_current (b0);
 658
 659       vlib_buffer_advance (b0, -(sizeof(*ip1)));
 660       ip1 = vlib_buffer_get_current (b0);
 661
 662       copy_ip6_address(&client_address, &h0->peer_addr);
 663
 664       ia0 = ip6_interface_first_address (&ip6_main, sw_if_index);
 665       if (ia0 == 0)
 666         {
 667           error0 = DHCPV6_PROXY_ERROR_NO_INTERFACE_ADDRESS;
 668           goto drop_packet;
 669         }
 670
 671       len =  clib_net_to_host_u16(r0->length);
 672       memset(ip1, 0, sizeof(*ip1));
 673       copy_ip6_address(&ip1->dst_address, &client_address);
 674       u1->checksum = 0;
 675       u1->src_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_server);
 676       u1->dst_port = clib_net_to_host_u16 (UDP_DST_PORT_dhcpv6_to_client);
 677       u1->length = clib_host_to_net_u16 (len + sizeof(udp_header_t));
 678
 679       ip1->ip_version_traffic_class_and_flow_label =
 680           ip0->ip_version_traffic_class_and_flow_label &
 681           0x00000fff;
 682       ip1->payload_length =  u1->length;
 683       ip1->protocol = PROTO_UDP;
 684       ip1->hop_limit = HOP_COUNT_LIMIT;
 685       copy_ip6_address(&ip1->src_address, ia0);
 686
 687       u1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0, ip1,
 688                                                        &bogus_length);
 689       ASSERT(bogus_length == 0);
 690
 691       vlib_buffer_advance (b0, -(sizeof(ethernet_header_t)));
 692       si0 = vnet_get_sw_interface (vnm, original_sw_if_index);
 693       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 694           vlib_buffer_advance (b0, -4 /* space for VLAN tag */);
 695
 696       mac0 = vlib_buffer_get_current (b0);
 697
 698       hi0 = vnet_get_sup_hw_interface (vnm, original_sw_if_index);
 699       ei0 = pool_elt_at_index (em->interfaces, hi0->hw_instance);
 700       clib_memcpy (mac0->src_address, ei0->address, sizeof (ei0->address));
 701       memset (&mac0->dst_address, 0xff, sizeof (mac0->dst_address));
 702       mac0->type = (si0->type == VNET_SW_INTERFACE_TYPE_SUB) ?
 703         clib_net_to_host_u16(0x8100) : clib_net_to_host_u16 (0x86dd);
 704
 705       if (si0->type == VNET_SW_INTERFACE_TYPE_SUB)
 706         {
 707           u32 * vlan_tag = (u32 *)(mac0+1);
 708           u32 tmp;
 709           tmp = (si0->sub.id << 16) | 0x0800;
 710           *vlan_tag = clib_host_to_net_u32 (tmp);
 711         }
 712
 713       /* $$$ consider adding a dynamic next to the graph node, for performance */
 714       f0 = vlib_get_frame_to_node (vm, hi0->output_node_index);
 715       to_next0 = vlib_frame_vector_args (f0);
 716       to_next0[0] = bi0;
 717       f0->n_vectors = 1;
 718       vlib_put_frame_to_node (vm, hi0->output_node_index, f0);
 719
 720     do_trace:
 721       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 722         {
 723           dhcpv6_proxy_trace_t *tr = vlib_add_trace (vm, node,
 724                                                      b0, sizeof (*tr));
 725           tr->which = 1; /* to client */
 726           if (ia0)
 727               copy_ip6_address((ip6_address_t*)tr->packet_data, ia0);
 728           tr->error = error0;
 729           tr->original_sw_if_index = original_sw_if_index;
 730           tr->sw_if_index = sw_if_index;
 731         }
 732     }
 733   return from_frame->n_vectors;
 734
 735 }
 736
 737 VLIB_REGISTER_NODE (dhcpv6_proxy_to_client_node) = {
 738   .function = dhcpv6_proxy_to_client_input,
 739   .name = "dhcpv6-proxy-to-client",
 740   /* Takes a vector of packets. */
 741   .vector_size = sizeof (u32),
 742
 743   .n_errors = DHCPV6_PROXY_N_ERROR,
 744   .error_strings = dhcpv6_proxy_error_strings,
 745   .format_buffer = format_dhcpv6_proxy_header_with_length,
 746   .format_trace = format_dhcpv6_proxy_trace,
 747 #if 0
 748   .unformat_buffer = unformat_dhcpv6_proxy_header,
 749 #endif
 750 };
 751
 752 clib_error_t * dhcpv6_proxy_init (vlib_main_t * vm)
 753 {
 754   dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main;
 755   vlib_node_t * error_drop_node;
 756   dhcpv6_server_t * server;
 757
 758   dm->vlib_main = vm;
 759   dm->vnet_main = vnet_get_main();
 760   error_drop_node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
 761   dm->error_drop_node_index = error_drop_node->index;
 762
 763   dm->vss_index_by_vrf_id = hash_create (0, sizeof (uword));
 764
 765   /* RFC says this is the dhcpv6 server address  */
 766   dm->all_dhcpv6_server_address.as_u64[0] = clib_host_to_net_u64 (0xFF05000000000000);
 767   dm->all_dhcpv6_server_address.as_u64[1] = clib_host_to_net_u64 (0x00010003);
 768
 769   /* RFC says this is the server and agent address */
 770   dm->all_dhcpv6_server_relay_agent_address.as_u64[0] = clib_host_to_net_u64 (0xFF02000000000000);
 771   dm->all_dhcpv6_server_relay_agent_address.as_u64[1] = clib_host_to_net_u64 (0x00010002);
 772
 773   udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 774                          dhcpv6_proxy_to_client_node.index, 0 /* is_ip6 */);
 775
 776   udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_server,
 777                          dhcpv6_proxy_to_server_node.index, 0 /* is_ip6 */);
 778
 779   /* Create the default server, don't mark it valid */
 780   pool_get (dm->dhcp6_servers, server);
 781   memset (server, 0, sizeof (*server));
 782
 783   return 0;
 784 }
 785
 786 VLIB_INIT_FUNCTION (dhcpv6_proxy_init);
 787
 788 /* Old API, manipulates a single server (only) shared by all Rx VRFs */
 789 int dhcpv6_proxy_set_server (ip6_address_t *addr, ip6_address_t *src_address,
 790                              u32 fib_id, int insert_vss, int is_del)
 791 {
 792         return dhcpv6_proxy_set_server_2 (addr, src_address,
 793                         0, fib_id,
 794                         insert_vss, is_del);
 795 }
 796
 797 int dhcpv6_proxy_set_server_2 (ip6_address_t *addr, ip6_address_t *src_address,
 798                                u32 rx_fib_id, u32 server_fib_id,
 799                                int insert_vss, int is_del)
 800 {
 801   dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main;
 802   dhcpv6_server_t * server = 0;
 803   u32 server_fib_index = 0;
 804   u32 rx_fib_index = 0;
 805
 806   rx_fib_index = ip6_mfib_table_find_or_create_and_lock(rx_fib_id);
 807   server_fib_index = ip6_fib_table_find_or_create_and_lock(server_fib_id);
 808
 809   if (is_del)
 810       {
 811
 812           if (rx_fib_index >= vec_len(dm->dhcp6_server_index_by_rx_fib_index))
 813                   return VNET_API_ERROR_NO_SUCH_ENTRY;
 814
 815           server_fib_index = dm->dhcp6_server_index_by_rx_fib_index[rx_fib_index];
 816
 817           dm->dhcp6_server_index_by_rx_fib_index[rx_fib_index] = 0;
 818           server = pool_elt_at_index (dm->dhcp6_servers, server_fib_index);
 819           memset (server, 0, sizeof (*server));
 820           pool_put (dm->dhcp6_servers, server);
 821           return 0;
 822       }
 823
 824   if (addr->as_u64[0] == 0 &&
 825         addr->as_u64[1] == 0 )
 826       return VNET_API_ERROR_INVALID_DST_ADDRESS;
 827
 828     if (src_address->as_u64[0] == 0 &&
 829         src_address->as_u64[1] == 0)
 830       return VNET_API_ERROR_INVALID_SRC_ADDRESS;
 831
 832   if (rx_fib_id == 0)
 833     {
 834       server = pool_elt_at_index (dm->dhcp6_servers, 0);
 835       if (server->valid)
 836           goto reconfigure_it;
 837       else
 838           goto initialize_it;
 839     }
 840
 841   if (rx_fib_index < vec_len(dm->dhcp6_server_index_by_rx_fib_index))
 842     {
 843       server_fib_index = dm->dhcp6_server_index_by_rx_fib_index[rx_fib_index];
 844       if (server_fib_index != 0)
 845         {
 846           server = pool_elt_at_index (dm->dhcp6_servers, server_fib_index);
 847           goto initialize_it;
 848         }
 849     }
 850
 851   /*Allocate a new server*/
 852   pool_get (dm->dhcp6_servers, server);
 853
 854   initialize_it:
 855   {
 856       const mfib_prefix_t all_dhcp_servers = {
 857           .fp_len = 128,
 858           .fp_proto = FIB_PROTOCOL_IP6,
 859           .fp_grp_addr = {
 860               .ip6 = dm->all_dhcpv6_server_relay_agent_address,
 861           }
 862       };
 863       const fib_route_path_t path_for_us = {
 864           .frp_proto = FIB_PROTOCOL_IP6,
 865           .frp_addr = zero_addr,
 866           .frp_sw_if_index = 0xffffffff,
 867           .frp_fib_index = ~0,
 868           .frp_weight = 0,
 869           .frp_flags = FIB_ROUTE_PATH_LOCAL,
 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 input
 882        * feature ensures this.
 883        */
 884       mfib_table_entry_update(rx_fib_index,
 885                               &all_dhcp_servers,
 886                               MFIB_SOURCE_DHCP,
 887                               MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF);
 888   }
 889
 890 reconfigure_it:
 891
 892   copy_ip6_address(&server->dhcp6_server, addr);
 893   copy_ip6_address(&server->dhcp6_src_address, src_address);
 894   server->server_fib6_index = server_fib_index;
 895   server->valid = 1;
 896   server->insert_vss = insert_vss;
 897
 898   vec_validate (dm->dhcp6_server_index_by_rx_fib_index, rx_fib_index);
 899   dm->dhcp6_server_index_by_rx_fib_index[rx_fib_index] =
 900                   server - dm->dhcp6_servers;
 901
 902   return 0;
 903 }
 904
 905 static clib_error_t *
 906 dhcpv6_proxy_set_command_fn (vlib_main_t * vm,
 907                            unformat_input_t * input,
 908                            vlib_cli_command_t * cmd)
 909 {
 910   ip6_address_t addr, src_addr;
 911   int set_server = 0, set_src_address = 0;
 912   u32 rx_fib_id = 0, server_fib_id = 0;
 913   int is_del = 0, add_vss = 0;
 914
 915   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
 916     {
 917       if (unformat (input, "server %U",
 918                     unformat_ip6_address, &addr))
 919          set_server = 1;
 920       else if (unformat(input, "src-address %U",
 921                         unformat_ip6_address, &src_addr))
 922           set_src_address =1;
 923        else if (unformat (input, "server-fib-id %d", &server_fib_id))
 924         ;
 925        else if (unformat (input, "rx-fib-id %d", &rx_fib_id))
 926          ;
 927        else if (unformat (input, "add-vss-option")
 928                || unformat (input, "insert-option"))
 929           add_vss = 1;
 930        else if (unformat (input, "delete") ||
 931                 unformat (input, "del"))
 932            is_del = 1;
 933       else
 934         break;
 935     }
 936
 937   if (is_del || (set_server && set_src_address))
 938   {
 939       int rv;
 940
 941       rv = dhcpv6_proxy_set_server_2 (&addr, &src_addr, rx_fib_id,
 942                   server_fib_id, add_vss, is_del);
 943
 944       //TODO: Complete the errors
 945       switch (rv)
 946         {
 947         case 0:
 948           return 0;
 949
 950         case -1:
 951           return clib_error_return (0, "FIB id %d does not exist", server_fib_id);
 952
 953         default:
 954           return clib_error_return (0, "BUG: rv %d", rv);
 955         }
 956   }
 957   else
 958     return clib_error_return (0, "parse error`%U'",
 959                               format_unformat_error, input);
 960 }
 961
 962 VLIB_CLI_COMMAND (dhcpv6_proxy_set_command, static) = {
 963   .path = "set dhcpv6 proxy",
 964   .short_help = "set dhcpv6 proxy [del] server <ipv6-addr> src-address <ipv6-addr> "
 965                   "[add-vss-option] [server-fib-id <fib-id>] [rx-fib-id <fib-id>] ",
 966   .function = dhcpv6_proxy_set_command_fn,
 967 };
 968
 969 u8 * format_dhcpv6_proxy_server (u8 * s, va_list * args)
 970 {
 971   dhcpv6_proxy_main_t * dm = va_arg (*args, dhcpv6_proxy_main_t *);
 972   dhcpv6_server_t * server = va_arg (*args, dhcpv6_server_t *);
 973   u32 rx_fib_index = va_arg (*args, u32);
 974   ip6_fib_t * rx_fib, * server_fib;
 975   u32 server_fib_id = (u32)~0, rx_fib_id = ~0;
 976
 977   if (dm == 0)
 978     {
 979       s = format (s, "%=40s%=40s%=14s%=14s%=20s", "Server Address", "Source Address",
 980                   "Server FIB", "RX FIB", "Insert VSS Option");
 981       return s;
 982     }
 983
 984   server_fib = ip6_fib_get(server->server_fib6_index);
 985   if (server_fib)
 986           server_fib_id= server_fib->table_id;
 987
 988   rx_fib= ip6_fib_get(rx_fib_index);
 989
 990   if (rx_fib)
 991           rx_fib_id = rx_fib->table_id;
 992
 993   s = format (s, "%=40U%=40U%=14u%=14u%=20s",
 994               format_ip6_address, &server->dhcp6_server,
 995               format_ip6_address, &server->dhcp6_src_address,
 996                           server_fib_id, rx_fib_id,
 997                                         server->insert_vss ? "yes" : "no");
 998   return s;
 999 }
1000
1001 static clib_error_t *
1002 dhcpv6_proxy_show_command_fn (vlib_main_t * vm,
1003                             unformat_input_t * input,
1004                             vlib_cli_command_t * cmd)
1005 {
1006   dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main;
1007   ip6_main_t * im = &ip6_main;
1008   int i;
1009   u32 server_index;
1010   dhcpv6_server_t * server;
1011
1012   vlib_cli_output (vm, "%U", format_dhcpv6_proxy_server, 0 /* header line */,
1013                   0, 0);
1014   for (i = 0; i < vec_len (im->fibs); i++)
1015       {
1016         if (i < vec_len(dm->dhcp6_server_index_by_rx_fib_index))
1017           server_index = dm->dhcp6_server_index_by_rx_fib_index[i];
1018         else
1019           server_index = 0;
1020         server = pool_elt_at_index (dm->dhcp6_servers, server_index);
1021         if (server->valid)
1022           vlib_cli_output (vm, "%U", format_dhcpv6_proxy_server, dm,
1023                   server, i);
1024       }
1025   return 0;
1026 }
1027
1028 VLIB_CLI_COMMAND (dhcpv6_proxy_show_command, static) = {
1029   .path = "show dhcpv6 proxy",
1030   .short_help = "Display dhcpv6 proxy info",
1031   .function = dhcpv6_proxy_show_command_fn,
1032 };
1033
1034 int dhcpv6_proxy_set_vss(u32 tbl_id,
1035                          u32 oui,
1036                          u32 fib_id,
1037                          int is_del)
1038 {
1039   dhcpv6_proxy_main_t *dm = &dhcpv6_proxy_main;
1040   u32 old_oui, old_fib_id;
1041   uword *p;
1042   dhcpv6_vss_info *v;
1043
1044   p = hash_get (dm->vss_index_by_vrf_id, tbl_id);
1045
1046   if (p) {
1047       v = pool_elt_at_index (dm->vss, p[0]);
1048       if (!v)
1049         return VNET_API_ERROR_NO_SUCH_FIB;
1050
1051       old_oui = v->vpn_id.oui;
1052       old_fib_id = v->vpn_id.fib_id;
1053
1054       if (is_del)
1055       {
1056           if (old_oui == oui &&
1057               old_fib_id == fib_id )
1058           {
1059               pool_put(dm->vss, v);
1060               hash_unset (dm->vss_index_by_vrf_id, tbl_id);
1061               return 0;
1062           }
1063           else
1064             return VNET_API_ERROR_NO_SUCH_ENTRY;
1065       }
1066
1067       pool_put(dm->vss, v);
1068       hash_unset (dm->vss_index_by_vrf_id, tbl_id);
1069   } else if (is_del)
1070     return VNET_API_ERROR_NO_SUCH_ENTRY;
1071
1072   pool_get (dm->vss, v);
1073   memset (v, ~0, sizeof (*v));
1074   v->vpn_id.fib_id = fib_id;
1075   v->vpn_id.oui = oui;
1076   hash_set (dm->vss_index_by_vrf_id, tbl_id, v - dm->vss);
1077
1078   return 0;
1079 }
1080
1081
1082 static clib_error_t *
1083 dhcpv6_vss_command_fn (vlib_main_t * vm,
1084                            unformat_input_t * input,
1085                            vlib_cli_command_t * cmd)
1086 {
1087   int is_del = 0, got_new_vss=0;
1088   u32 oui=0;
1089   u32 fib_id=0, tbl_id=~0;
1090
1091   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
1092     {
1093       if (unformat (input, "oui %d", &oui))
1094           got_new_vss = 1;
1095       else if (unformat (input, "vpn-id %d", &fib_id))
1096           got_new_vss = 1;
1097       else if (unformat (input, "table %d", &tbl_id))
1098           got_new_vss = 1;
1099       else if (unformat(input, "delete") || unformat(input, "del"))
1100           is_del = 1;
1101       else
1102           break;
1103     }
1104
1105   if (tbl_id ==~0)
1106       return clib_error_return (0, "no table ID specified.");
1107
1108   if (is_del || got_new_vss)
1109     {
1110       int rv;
1111
1112       rv = dhcpv6_proxy_set_vss(tbl_id, oui, fib_id, is_del);
1113       switch (rv)
1114         {
1115         case 0:
1116           return 0;
1117
1118         case VNET_API_ERROR_NO_SUCH_FIB:
1119             return clib_error_return (0, "vss info (oui:%d, vpn-id:%d)  not found in table %d.",
1120                                       oui, fib_id, tbl_id);
1121
1122         case VNET_API_ERROR_NO_SUCH_ENTRY:
1123             return clib_error_return (0, "vss for table %d not found in pool.",
1124                                       tbl_id);
1125
1126         default:
1127           return clib_error_return (0, "BUG: rv %d", rv);
1128         }
1129     }
1130   else
1131       return clib_error_return (0, "parse error`%U'",
1132                                 format_unformat_error, input);
1133
1134 }
1135
1136 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_command, static) = {
1137   .path = "set dhcpv6 vss",
1138   .short_help = "set dhcpv6 vss table <table-id> oui <oui> vpn-idx <vpn-idx>",
1139   .function = dhcpv6_vss_command_fn,
1140 };
1141
1142 static clib_error_t *
1143 dhcpv6_vss_show_command_fn (vlib_main_t * vm,
1144                             unformat_input_t * input,
1145                             vlib_cli_command_t * cmd)
1146
1147 {
1148   dhcpv6_proxy_main_t * dm = &dhcpv6_proxy_main;
1149   dhcpv6_vss_info *v;
1150   u32 oui;
1151   u32 fib_id;
1152   u32 tbl_id;
1153   uword index;
1154
1155   vlib_cli_output (vm, "%=6s%=6s%=12s","Table", "OUI", "VPN ID");
1156   hash_foreach (tbl_id, index, dm->vss_index_by_vrf_id,
1157   ({
1158      v = pool_elt_at_index (dm->vss, index);
1159      oui = v->vpn_id.oui;
1160      fib_id = v->vpn_id.fib_id;
1161      vlib_cli_output (vm, "%=6d%=6d%=12d",
1162                       tbl_id, oui, fib_id);
1163   }));
1164
1165   return 0;
1166 }
1167
1168 VLIB_CLI_COMMAND (dhcpv6_proxy_vss_show_command, static) = {
1169   .path = "show dhcpv6 vss",
1170   .short_help = "show dhcpv6 VSS",
1171   .function = dhcpv6_vss_show_command_fn,
1172 };
1173
1174 static clib_error_t *
1175 dhcpv6_link_address_show_command_fn (vlib_main_t * vm,
1176                                 unformat_input_t * input,
1177                                 vlib_cli_command_t * cmd)
1178
1179 {
1180   dhcpv6_proxy_main_t *dm = &dhcpv6_proxy_main;
1181   vnet_main_t *vnm = vnet_get_main();
1182   u32 sw_if_index0=0, sw_if_index;
1183   ip6_address_t *ia0;
1184   vnet_sw_interface_t *swif;
1185
1186   while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
1187     {
1188
1189       if (unformat(input, "%U",
1190                    unformat_vnet_sw_interface, dm->vnet_main, &sw_if_index0))
1191         {
1192             swif = vnet_get_sw_interface (vnm, sw_if_index0);
1193             sw_if_index = (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED) ?
1194                 swif->unnumbered_sw_if_index : sw_if_index0;
1195             ia0 = ip6_interface_first_address(&ip6_main, sw_if_index);
1196             if (ia0)
1197               {
1198                   vlib_cli_output (vm, "%=20s%=48s", "interface", "link-address");
1199
1200                   vlib_cli_output (vm, "%=20U%=48U",
1201                                    format_vnet_sw_if_index_name, dm->vnet_main, sw_if_index0,
1202                                    format_ip6_address, ia0);
1203               } else
1204                 vlib_cli_output (vm, "%=34s%=20U", "No IPv6 address configured on",
1205                                  format_vnet_sw_if_index_name, dm->vnet_main, sw_if_index);
1206         } else
1207           break;
1208     }
1209
1210   return 0;
1211 }
1212
1213 VLIB_CLI_COMMAND (dhcpv6_proxy_address_show_command, static) = {
1214   .path = "show dhcpv6 link-address interface",
1215   .short_help = "show dhcpv6 link-address interface <interface>",
1216   .function = dhcpv6_link_address_show_command_fn,
1217 };