vnet/vnet/l2tp/l2tp.c

   1 /*
   2  * l2tp.c : L2TPv3 tunnel support
   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 <vppinfra/error.h>
  19 #include <vppinfra/hash.h>
  20 #include <vnet/vnet.h>
  21 #include <vnet/ip/ip.h>
  22 #include <vnet/l2/l2_input.h>
  23 #include <vnet/ethernet/ethernet.h>
  24 #include <vnet/l2tp/l2tp.h>
  25
  26 l2t_main_t l2t_main;
  27
  28 /* packet trace format function */
  29 u8 * format_l2t_trace (u8 * s, va_list * args)
  30 {
  31   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  32   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  33   l2t_trace_t * t = va_arg (*args, l2t_trace_t *);
  34
  35   if (t->is_user_to_network)
  36     s = format (s, "L2T: %U (client) -> %U (our) session %d",
  37                 format_ip6_address, &t->client_address,
  38                 format_ip6_address, &t->our_address,
  39                 t->session_index);
  40   else
  41     s = format (s, "L2T: %U (our) -> %U (client) session %d)",
  42                 format_ip6_address, &t->our_address,
  43                   format_ip6_address, &t->client_address,
  44                   t->session_index);
  45   return s;
  46 }
  47
  48 u8 * format_l2t_session (u8 * s, va_list * args)
  49 {
  50   l2t_session_t * session = va_arg (*args, l2t_session_t *);
  51   l2t_main_t * lm = &l2t_main;
  52   u32 counter_index;
  53   vlib_counter_t v;
  54
  55   s = format (s, "[%d] %U (our) %U (client) %U (sw_if_index %d)\n",
  56               session - lm->sessions,
  57               format_ip6_address, &session->our_address,
  58               format_ip6_address, &session->client_address,
  59               format_vnet_sw_interface_name, lm->vnet_main,
  60               vnet_get_sw_interface (lm->vnet_main, session->sw_if_index),
  61               session->sw_if_index);
  62
  63   s = format (s, "   local cookies %016llx %016llx remote cookie %016llx\n",
  64               clib_net_to_host_u64 (session->local_cookie[0]),
  65               clib_net_to_host_u64 (session->local_cookie[1]),
  66               clib_net_to_host_u64 (session->remote_cookie));
  67
  68   s = format (s, "   local session-id %d remote session-id %d\n",
  69               clib_net_to_host_u32 (session->local_session_id),
  70               clib_net_to_host_u32 (session->remote_session_id));
  71
  72   s = format (s, "   l2 specific sublayer %s\n",
  73               session->l2_sublayer_present ? "preset" : "absent");
  74
  75   counter_index =
  76     session_index_to_counter_index (session - lm->sessions,
  77                                     SESSION_COUNTER_USER_TO_NETWORK);
  78
  79   vlib_get_combined_counter (&lm->counter_main, counter_index, &v);
  80   if (v.packets != 0)
  81     s = format (s, "   user-to-net: %llu pkts %llu bytes\n",
  82                 v.packets, v.bytes);
  83
  84   vlib_get_combined_counter (&lm->counter_main, counter_index+1, &v);
  85
  86   if (v.packets != 0)
  87     s = format (s, "   net-to-user: %llu pkts %llu bytes\n",
  88                 v.packets, v.bytes);
  89   return s;
  90 }
  91
  92 static clib_error_t *
  93 show_l2tp_command_fn (vlib_main_t * vm,
  94                       unformat_input_t * input,
  95                       vlib_cli_command_t * cmd)
  96 {
  97   l2t_session_t *session;
  98   l2t_main_t *lm = &l2t_main;
  99   char * keystr = 0;
 100   int verbose = 0;
 101
 102   if (unformat (input, "verbose") || unformat (input, "v"))
 103     verbose = 1;
 104
 105   if (pool_elts (lm->sessions) == 0)
 106       vlib_cli_output (vm, "No l2tp sessions...");
 107   else
 108       vlib_cli_output (vm, "%u l2tp sessions...", pool_elts (lm->sessions));
 109
 110   if (verbose)
 111     {
 112       switch (lm->lookup_type)
 113         {
 114         case L2T_LOOKUP_SRC_ADDRESS:
 115           keystr = "src address";
 116           break;
 117
 118         case L2T_LOOKUP_DST_ADDRESS:
 119           keystr = "dst address";
 120           break;
 121
 122         case L2T_LOOKUP_SESSION_ID:
 123           keystr = "session id";
 124           break;
 125
 126         default:
 127           keystr = "BOGUS!";
 128           break;
 129         }
 130
 131       vlib_cli_output (vm, "L2tp session lookup on %s", keystr);
 132
 133       pool_foreach (session, lm->sessions,
 134       ({
 135         vlib_cli_output (vm, "%U", format_l2t_session, session);
 136       }));
 137     }
 138
 139   return 0;
 140 }
 141
 142 VLIB_CLI_COMMAND (show_session_detail_command, static) = {
 143   .path = "show l2tpv3",
 144   .short_help = "show l2tpv3 [verbose]",
 145   .function = show_l2tp_command_fn,
 146 };
 147
 148 static clib_error_t *
 149 test_counters_command_fn (vlib_main_t * vm,
 150                           unformat_input_t * input,
 151                           vlib_cli_command_t * cmd)
 152 {
 153   l2t_session_t *session;
 154   l2t_main_t *lm = &l2t_main;
 155   u32 session_index;
 156   u32 counter_index;
 157   u32 nincr=0;
 158   u32 cpu_index = os_get_cpu_number();
 159
 160   pool_foreach (session, lm->sessions,
 161   ({
 162     session_index = session - lm->sessions;
 163     counter_index =
 164       session_index_to_counter_index (session_index,
 165                                       SESSION_COUNTER_USER_TO_NETWORK);
 166     vlib_increment_combined_counter (&lm->counter_main,
 167                                      cpu_index,
 168                                      counter_index,
 169                                      1/*pkt*/, 1111 /*bytes*/);
 170     vlib_increment_combined_counter (&lm->counter_main,
 171                                      cpu_index,
 172                                      counter_index+1,
 173                                      1/*pkt*/, 2222 /*bytes*/);
 174     nincr++;
 175
 176   }));
 177   vlib_cli_output (vm, "Incremented %d active counters\n", nincr);
 178
 179   return 0;
 180 }
 181
 182 VLIB_CLI_COMMAND (test_counters_command, static) = {
 183     .path = "test counters",
 184     .short_help = "increment all active counters",
 185     .function = test_counters_command_fn,
 186 };
 187
 188 static clib_error_t *
 189 clear_counters_command_fn (vlib_main_t * vm,
 190                           unformat_input_t * input,
 191                           vlib_cli_command_t * cmd)
 192 {
 193   l2t_session_t *session;
 194   l2t_main_t *lm = &l2t_main;
 195   u32 session_index;
 196   u32 counter_index;
 197   u32 nincr=0;
 198
 199   pool_foreach (session, lm->sessions,
 200   ({
 201     session_index = session - lm->sessions;
 202     counter_index =
 203       session_index_to_counter_index (session_index,
 204                                       SESSION_COUNTER_USER_TO_NETWORK);
 205     vlib_zero_combined_counter (&lm->counter_main, counter_index);
 206     vlib_zero_combined_counter (&lm->counter_main, counter_index+1);
 207     nincr++;
 208
 209   }));
 210   vlib_cli_output (vm, "Cleared %d active counters\n", nincr);
 211
 212   return 0;
 213 }
 214
 215 VLIB_CLI_COMMAND (clear_counters_command, static) = {
 216     .path = "clear counters",
 217     .short_help = "clear all active counters",
 218     .function = clear_counters_command_fn,
 219 };
 220
 221 static u8 * format_l2tpv3_name (u8 * s, va_list * args)
 222 {
 223   l2t_main_t *lm = &l2t_main;
 224   u32 i = va_arg (*args, u32);
 225   u32 show_dev_instance = ~0;
 226
 227   if (i < vec_len (lm->dev_inst_by_real))
 228     show_dev_instance = lm->dev_inst_by_real[i];
 229
 230   if (show_dev_instance != ~0)
 231     i = show_dev_instance;
 232
 233   return format (s, "l2tpv3_tunnel%d", i);
 234 }
 235
 236 static int l2tpv3_name_renumber (vnet_hw_interface_t * hi,
 237                                  u32 new_dev_instance)
 238 {
 239   l2t_main_t *lm = &l2t_main;
 240
 241   vec_validate_init_empty (lm->dev_inst_by_real, hi->dev_instance, ~0);
 242
 243   lm->dev_inst_by_real [hi->dev_instance] = new_dev_instance;
 244
 245   return 0;
 246 }
 247
 248 static uword dummy_interface_tx (vlib_main_t * vm,
 249                                  vlib_node_runtime_t * node,
 250                                  vlib_frame_t * frame)
 251 {
 252   clib_warning ("you shouldn't be here, leaking buffers...");
 253   return frame->n_vectors;
 254 }
 255
 256 VNET_DEVICE_CLASS (l2tpv3_device_class,static) = {
 257   .name = "L2TPv3",
 258   .format_device_name = format_l2tpv3_name,
 259   .name_renumber = l2tpv3_name_renumber,
 260   .tx_function = dummy_interface_tx,
 261 };
 262
 263 static uword dummy_set_rewrite (vnet_main_t * vnm,
 264                                 u32 sw_if_index,
 265                                 u32 l3_type,
 266                                 void * dst_address,
 267                                 void * rewrite,
 268                                 uword max_rewrite_bytes)
 269 {
 270   /*
 271    * Conundrum: packets from tun/tap destined for the tunnel
 272    * actually have this rewrite applied. Transit packets do not.
 273    * To make the two cases equivalent, don't generate a
 274    * rewrite here, build the entire header in the fast path.
 275    */
 276   return 0;
 277 }
 278
 279 static u8 * format_l2tp_header_with_length (u8 * s, va_list * args)
 280 {
 281   u32 dev_instance = va_arg (*args, u32);
 282   s = format (s, "unimplemented dev %u", dev_instance);
 283   return s;
 284 }
 285
 286 VNET_HW_INTERFACE_CLASS (l2tpv3_hw_class) = {
 287   .name = "L2TPV3",
 288   .format_header = format_l2tp_header_with_length,
 289   .set_rewrite = dummy_set_rewrite,
 290 };
 291
 292 int create_l2tpv3_ipv6_tunnel (l2t_main_t * lm,
 293                                ip6_address_t * client_address,
 294                                ip6_address_t * our_address,
 295                                u32 local_session_id,
 296                                u32 remote_session_id,
 297                                u64 local_cookie,
 298                                u64 remote_cookie,
 299                                int l2_sublayer_present,
 300                                u32 * sw_if_index)
 301 {
 302   l2t_session_t *s = 0;
 303   vnet_main_t * vnm = lm->vnet_main;
 304   vnet_hw_interface_t * hi;
 305   uword * p = (uword *) ~0;
 306   u32 hw_if_index;
 307   l2tpv3_header_t l2tp_hdr;
 308   ip6_address_t * dst_address_copy, * src_address_copy;
 309   u32 counter_index;
 310
 311   remote_session_id = clib_host_to_net_u32 (remote_session_id);
 312   local_session_id  = clib_host_to_net_u32 (local_session_id);
 313
 314   switch (lm->lookup_type) {
 315   case L2T_LOOKUP_SRC_ADDRESS:
 316     p = hash_get_mem (lm->session_by_src_address, client_address);
 317     break;
 318
 319   case L2T_LOOKUP_DST_ADDRESS:
 320     p = hash_get_mem (lm->session_by_dst_address, our_address);
 321     break;
 322
 323   case L2T_LOOKUP_SESSION_ID:
 324     p = hash_get (lm->session_by_session_id, local_session_id);
 325     break;
 326
 327   default:
 328     ASSERT(0);
 329   }
 330
 331   /* adding a session: session must not already exist */
 332   if (p)
 333     return VNET_API_ERROR_INVALID_VALUE;
 334
 335   pool_get (lm->sessions, s);
 336   memset (s, 0, sizeof (*s));
 337   clib_memcpy (&s->our_address, our_address, sizeof (s->our_address));
 338   clib_memcpy (&s->client_address, client_address, sizeof (s->client_address));
 339   s->local_cookie[0] = clib_host_to_net_u64 (local_cookie);
 340   s->remote_cookie = clib_host_to_net_u64 (remote_cookie);
 341   s->local_session_id = local_session_id;
 342   s->remote_session_id = remote_session_id;
 343   s->l2_sublayer_present = l2_sublayer_present;
 344   /* precompute l2tp header size */
 345   s->l2tp_hdr_size = l2_sublayer_present ?
 346     sizeof (l2tpv3_header_t) :
 347     sizeof (l2tpv3_header_t) - sizeof(l2tp_hdr.l2_specific_sublayer);
 348
 349   /* Setup hash table entries */
 350   switch (lm->lookup_type) {
 351   case L2T_LOOKUP_SRC_ADDRESS:
 352     src_address_copy = clib_mem_alloc (sizeof (*src_address_copy));
 353     clib_memcpy (src_address_copy, client_address, sizeof (*src_address_copy));
 354     hash_set_mem (lm->session_by_src_address, src_address_copy,
 355                   s - lm->sessions);
 356     break;
 357   case L2T_LOOKUP_DST_ADDRESS:
 358     dst_address_copy = clib_mem_alloc (sizeof (*dst_address_copy));
 359     clib_memcpy (dst_address_copy, our_address, sizeof (*dst_address_copy));
 360     hash_set_mem (lm->session_by_dst_address, dst_address_copy,
 361                   s - lm->sessions);
 362     break;
 363   case L2T_LOOKUP_SESSION_ID:
 364     hash_set (lm->session_by_session_id, local_session_id,
 365               s - lm->sessions);
 366     break;
 367
 368   default:
 369     ASSERT(0);
 370   }
 371
 372   /* validate counters */
 373   counter_index =
 374     session_index_to_counter_index (s - lm->sessions,
 375                                     SESSION_COUNTER_USER_TO_NETWORK);
 376   vlib_validate_combined_counter (&lm->counter_main, counter_index);
 377   vlib_validate_combined_counter (&lm->counter_main, counter_index+1);
 378
 379   if (vec_len (lm->free_l2tpv3_tunnel_hw_if_indices) > 0)
 380     {
 381       hw_if_index = lm->free_l2tpv3_tunnel_hw_if_indices
 382         [vec_len (lm->free_l2tpv3_tunnel_hw_if_indices)-1];
 383       _vec_len (lm->free_l2tpv3_tunnel_hw_if_indices) -= 1;
 384
 385       hi = vnet_get_hw_interface (vnm, hw_if_index);
 386       hi->dev_instance = s - lm->sessions;
 387       hi->hw_instance = hi->dev_instance;
 388     }
 389   else
 390     {
 391       hw_if_index = vnet_register_interface
 392         (vnm, l2tpv3_device_class.index, s - lm->sessions,
 393          l2tpv3_hw_class.index, s - lm->sessions);
 394       hi = vnet_get_hw_interface (vnm, hw_if_index);
 395       hi->output_node_index = l2t_encap_node.index;
 396       /* $$$$ initialize custom dispositions, if needed */
 397     }
 398
 399   s->hw_if_index = hw_if_index;
 400   s->sw_if_index = hi->sw_if_index;
 401
 402   if (sw_if_index)
 403     *sw_if_index = hi->sw_if_index;
 404
 405   vnet_sw_interface_set_flags (vnm, hi->sw_if_index,
 406                                VNET_SW_INTERFACE_FLAG_ADMIN_UP);
 407
 408   return 0;
 409 }
 410
 411 static clib_error_t *
 412 create_l2tpv3_tunnel_command_fn (vlib_main_t * vm,
 413                                  unformat_input_t * input,
 414                                  vlib_cli_command_t * cmd)
 415 {
 416   ip6_address_t client_address, our_address;
 417   unformat_input_t _line_input, * line_input = &_line_input;
 418   l2t_main_t *lm = &l2t_main;
 419   u64 local_cookie = (u64)~0, remote_cookie = (u64)~0;
 420   u32 local_session_id = 1, remote_session_id = 1;
 421   int our_address_set = 0, client_address_set = 0;
 422   int l2_sublayer_present = 0;
 423   int rv;
 424   u32 sw_if_index;
 425
 426   /* Get a line of input. */
 427   if (! unformat_user (input, unformat_line_input, line_input))
 428     return 0;
 429
 430   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) {
 431     if (unformat (line_input, "client %U",
 432                   unformat_ip6_address, &client_address))
 433       client_address_set = 1;
 434     else if (unformat (line_input, "our %U",
 435                        unformat_ip6_address, &our_address))
 436       our_address_set = 1;
 437     else if (unformat (line_input, "local-cookie %llx", &local_cookie))
 438       ;
 439     else if (unformat (line_input, "remote-cookie %llx", &remote_cookie))
 440       ;
 441     else if (unformat (line_input, "local-session-id %d",
 442                        &local_session_id))
 443       ;
 444     else if (unformat (line_input, "remote-session-id %d",
 445                        &remote_session_id))
 446       ;
 447     else if (unformat (line_input, "l2-sublayer-present"))
 448       l2_sublayer_present = 1;
 449     else
 450       return clib_error_return (0, "parse error: '%U'",
 451                                 format_unformat_error, line_input);
 452   }
 453
 454   unformat_free (line_input);
 455
 456   if (our_address_set == 0)
 457     return clib_error_return (0, "our address not specified");
 458   if (client_address_set == 0)
 459     return clib_error_return (0, "client address not specified");
 460
 461   rv = create_l2tpv3_ipv6_tunnel (lm, &client_address, &our_address,
 462                                   local_session_id, remote_session_id,
 463                                   local_cookie, remote_cookie,
 464                                   l2_sublayer_present,
 465                                   &sw_if_index);
 466   switch(rv)
 467     {
 468     case 0:
 469       vlib_cli_output(vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main(), sw_if_index);
 470       break;
 471     case VNET_API_ERROR_INVALID_VALUE:
 472       return clib_error_return (0, "session already exists...");
 473
 474     case VNET_API_ERROR_NO_SUCH_ENTRY:
 475       return clib_error_return (0, "session does not exist...");
 476
 477     default:
 478       return clib_error_return (0, "l2tp_session_add_del returned %d", rv);
 479     }
 480
 481   return 0;
 482 }
 483
 484 VLIB_CLI_COMMAND (create_l2tpv3_tunnel_command, static) = {
 485     .path = "create l2tpv3 tunnel",
 486     .short_help =
 487     "create l2tpv3 tunnel client <ip6> our <ip6> local-cookie <hex> remote-cookie <hex> local-session <dec> remote-session <dec>",
 488     .function = create_l2tpv3_tunnel_command_fn,
 489 };
 490
 491 int l2tpv3_set_tunnel_cookies (l2t_main_t * lm,
 492                                u32 sw_if_index,
 493                                u64 new_local_cookie,
 494                                u64 new_remote_cookie)
 495 {
 496     l2t_session_t *s;
 497     vnet_hw_interface_t * hi;
 498     vnet_main_t * vnm = vnet_get_main();
 499     hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
 500
 501     if (pool_is_free_index (lm->sessions, hi->dev_instance))
 502         return VNET_API_ERROR_INVALID_VALUE;
 503
 504     s = pool_elt_at_index (lm->sessions, hi->dev_instance);
 505
 506     s->local_cookie[1] = s->local_cookie[0];
 507     s->local_cookie[0] = clib_host_to_net_u64(new_local_cookie);
 508     s->remote_cookie = clib_host_to_net_u64(new_remote_cookie);
 509
 510     return 0;
 511 }
 512
 513
 514 static clib_error_t *
 515 set_l2tp_tunnel_cookie_command_fn (vlib_main_t * vm,
 516                                 unformat_input_t * input,
 517                                 vlib_cli_command_t * cmd)
 518 {
 519   l2t_main_t *lm = &l2t_main;
 520   vnet_main_t * vnm = vnet_get_main();
 521   u32 sw_if_index = ~0;
 522   u64 local_cookie = (u64)~0, remote_cookie = (u64)~0;
 523
 524   int rv;
 525
 526   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 527     {
 528       if (unformat (input, "%U", unformat_vnet_sw_interface, vnm,
 529                     &sw_if_index))
 530         ;
 531       else if (unformat (input, "local %llx", &local_cookie))
 532         ;
 533       else if (unformat (input, "remote %llx", &remote_cookie))
 534         ;
 535       else
 536         break;
 537     }
 538   if (sw_if_index == ~0)
 539     return clib_error_return (0, "unknown interface");
 540   if (local_cookie == ~0)
 541     return clib_error_return (0, "local cookie required");
 542   if (remote_cookie == ~0)
 543     return clib_error_return (0, "remote cookie required");
 544
 545   rv = l2tpv3_set_tunnel_cookies (lm, sw_if_index,
 546                                   local_cookie, remote_cookie);
 547
 548   switch (rv)
 549     {
 550     case 0:
 551       break;
 552
 553     case VNET_API_ERROR_INVALID_SW_IF_INDEX:
 554       return clib_error_return (0, "invalid interface");
 555
 556     default:
 557       return clib_error_return (0, "l2tp_session_set_cookies returned %d",
 558                                 rv);
 559     }
 560
 561     return 0;
 562 }
 563
 564 VLIB_CLI_COMMAND (set_l2tp_tunnel_cookie_command, static) = {
 565     .path = "set l2tpv3 tunnel cookie",
 566     .short_help =
 567     "set l2tpv3 tunnel cookie <intfc> local <hex> remote <hex>",
 568     .function = set_l2tp_tunnel_cookie_command_fn,
 569 };
 570
 571 int l2tpv3_interface_enable_disable (vnet_main_t * vnm,
 572                                      u32 sw_if_index,
 573                                      int enable_disable)
 574 {
 575   ip6_main_t * im = &ip6_main;
 576   ip_lookup_main_t * lm = &im->lookup_main;
 577   ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST];
 578   u32 ci;
 579   ip6_l2tpv3_config_t config;
 580   u32 feature_index;
 581
 582   if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
 583     return VNET_API_ERROR_INVALID_SW_IF_INDEX;
 584
 585   feature_index = im->ip6_unicast_rx_feature_ipsec;
 586
 587   ci = rx_cm->config_index_by_sw_if_index[sw_if_index];
 588   ci = (enable_disable
 589         ? vnet_config_add_feature
 590         : vnet_config_del_feature)
 591     (vlib_get_main(), &rx_cm->config_main,
 592      ci,
 593      feature_index,
 594      &config,
 595      sizeof (config));
 596   rx_cm->config_index_by_sw_if_index[sw_if_index] = ci;
 597   return 0;
 598 }
 599
 600 /* Enable/disable L2TPv3 intercept on IP6 fowarding path */
 601 static clib_error_t *
 602 set_ip6_l2tpv3 (vlib_main_t * vm,
 603                 unformat_input_t * input,
 604                 vlib_cli_command_t * cmd)
 605 {
 606   u32 sw_if_index = ~0;
 607   int is_add = 1;
 608   int rv;
 609   vnet_main_t * vnm = vnet_get_main();
 610
 611   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 612     {
 613       if (unformat (input, "%U", unformat_vnet_sw_interface, vnm,
 614                     &sw_if_index))
 615         ;
 616       else if (unformat (input, "del"))
 617         is_add = 0;
 618       else
 619         break;
 620     }
 621
 622   if (sw_if_index == ~0)
 623     return clib_error_return (0, "interface required");
 624
 625   rv = l2tpv3_interface_enable_disable (vnm, sw_if_index, is_add);
 626
 627   switch (rv)
 628     {
 629     case 0:
 630       break;
 631
 632     case VNET_API_ERROR_INVALID_SW_IF_INDEX:
 633       return clib_error_return (0, "invalid interface");
 634
 635     default:
 636       return clib_error_return (0, "l2tp_interface_enable_disable returned %d",
 637                                 rv);
 638     }
 639   return 0;
 640 }
 641
 642 VLIB_CLI_COMMAND (set_interface_ip6_l2tpv3, static) = {
 643   .path = "set interface ip6 l2tpv3",
 644   .function = set_ip6_l2tpv3,
 645   .short_help = "set interface ip6 l2tpv3 <intfc> [del]",
 646 };
 647
 648 static clib_error_t *
 649 l2tp_config (vlib_main_t * vm, unformat_input_t * input)
 650 {
 651     l2t_main_t *lm = &l2t_main;
 652
 653     while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
 654         if (unformat (input, "lookup-v6-src"))
 655             lm->lookup_type = L2T_LOOKUP_SRC_ADDRESS;
 656         else if (unformat (input, "lookup-v6-dst"))
 657             lm->lookup_type = L2T_LOOKUP_DST_ADDRESS;
 658         else if (unformat (input, "lookup-session-id"))
 659             lm->lookup_type = L2T_LOOKUP_SESSION_ID;
 660         else return clib_error_return (0, "unknown input `%U'",
 661                                        format_unformat_error, input);
 662     }
 663     return 0;
 664 }
 665
 666 VLIB_CONFIG_FUNCTION (l2tp_config, "l2tp");
 667
 668 clib_error_t *l2tp_init (vlib_main_t *vm)
 669 {
 670     l2t_main_t *lm = &l2t_main;
 671     ip_main_t * im = &ip_main;
 672     ip_protocol_info_t * pi;
 673
 674     lm->vnet_main = vnet_get_main();
 675     lm->vlib_main = vm;
 676     lm->lookup_type = L2T_LOOKUP_DST_ADDRESS;
 677
 678     lm->session_by_src_address = hash_create_mem
 679         (0, sizeof (ip6_address_t) /* key bytes */,
 680          sizeof (u32) /* value bytes */);
 681     lm->session_by_dst_address = hash_create_mem
 682         (0, sizeof (ip6_address_t) /* key bytes */,
 683          sizeof (u32) /* value bytes */);
 684     lm->session_by_session_id = hash_create (0, sizeof (uword));
 685
 686     pi = ip_get_protocol_info (im, IP_PROTOCOL_L2TP);
 687     pi->unformat_pg_edit = unformat_pg_l2tp_header;
 688
 689     /* insure these nodes are included in build */
 690     l2tp_encap_init(vm);
 691     l2tp_decap_init();
 692
 693     return 0;
 694 }
 695
 696 VLIB_INIT_FUNCTION(l2tp_init);
 697