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   s->admin_up = 0;
 349
 350   /* Setup hash table entries */
 351   switch (lm->lookup_type) {
 352   case L2T_LOOKUP_SRC_ADDRESS:
 353     src_address_copy = clib_mem_alloc (sizeof (*src_address_copy));
 354     clib_memcpy (src_address_copy, client_address, sizeof (*src_address_copy));
 355     hash_set_mem (lm->session_by_src_address, src_address_copy,
 356                   s - lm->sessions);
 357     break;
 358   case L2T_LOOKUP_DST_ADDRESS:
 359     dst_address_copy = clib_mem_alloc (sizeof (*dst_address_copy));
 360     clib_memcpy (dst_address_copy, our_address, sizeof (*dst_address_copy));
 361     hash_set_mem (lm->session_by_dst_address, dst_address_copy,
 362                   s - lm->sessions);
 363     break;
 364   case L2T_LOOKUP_SESSION_ID:
 365     hash_set (lm->session_by_session_id, local_session_id,
 366               s - lm->sessions);
 367     break;
 368
 369   default:
 370     ASSERT(0);
 371   }
 372
 373   /* validate counters */
 374   counter_index =
 375     session_index_to_counter_index (s - lm->sessions,
 376                                     SESSION_COUNTER_USER_TO_NETWORK);
 377   vlib_validate_combined_counter (&lm->counter_main, counter_index);
 378   vlib_validate_combined_counter (&lm->counter_main, counter_index+1);
 379
 380   if (vec_len (lm->free_l2tpv3_tunnel_hw_if_indices) > 0)
 381     {
 382       hw_if_index = lm->free_l2tpv3_tunnel_hw_if_indices
 383         [vec_len (lm->free_l2tpv3_tunnel_hw_if_indices)-1];
 384       _vec_len (lm->free_l2tpv3_tunnel_hw_if_indices) -= 1;
 385
 386       hi = vnet_get_hw_interface (vnm, hw_if_index);
 387       hi->dev_instance = s - lm->sessions;
 388       hi->hw_instance = hi->dev_instance;
 389     }
 390   else
 391     {
 392       hw_if_index = vnet_register_interface
 393         (vnm, l2tpv3_device_class.index, s - lm->sessions,
 394          l2tpv3_hw_class.index, s - lm->sessions);
 395       hi = vnet_get_hw_interface (vnm, hw_if_index);
 396       hi->output_node_index = l2t_encap_node.index;
 397       /* $$$$ initialize custom dispositions, if needed */
 398     }
 399
 400   s->hw_if_index = hw_if_index;
 401   s->sw_if_index = hi->sw_if_index;
 402
 403   if (sw_if_index)
 404     *sw_if_index = hi->sw_if_index;
 405
 406   return 0;
 407 }
 408
 409 static clib_error_t *
 410 create_l2tpv3_tunnel_command_fn (vlib_main_t * vm,
 411                                  unformat_input_t * input,
 412                                  vlib_cli_command_t * cmd)
 413 {
 414   ip6_address_t client_address, our_address;
 415   unformat_input_t _line_input, * line_input = &_line_input;
 416   l2t_main_t *lm = &l2t_main;
 417   u64 local_cookie = (u64)~0, remote_cookie = (u64)~0;
 418   u32 local_session_id = 1, remote_session_id = 1;
 419   int our_address_set = 0, client_address_set = 0;
 420   int l2_sublayer_present = 0;
 421   int rv;
 422   u32 sw_if_index;
 423
 424   /* Get a line of input. */
 425   if (! unformat_user (input, unformat_line_input, line_input))
 426     return 0;
 427
 428   while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) {
 429     if (unformat (line_input, "client %U",
 430                   unformat_ip6_address, &client_address))
 431       client_address_set = 1;
 432     else if (unformat (line_input, "our %U",
 433                        unformat_ip6_address, &our_address))
 434       our_address_set = 1;
 435     else if (unformat (line_input, "local-cookie %llx", &local_cookie))
 436       ;
 437     else if (unformat (line_input, "remote-cookie %llx", &remote_cookie))
 438       ;
 439     else if (unformat (line_input, "local-session-id %d",
 440                        &local_session_id))
 441       ;
 442     else if (unformat (line_input, "remote-session-id %d",
 443                        &remote_session_id))
 444       ;
 445     else if (unformat (line_input, "l2-sublayer-present"))
 446       l2_sublayer_present = 1;
 447     else
 448       return clib_error_return (0, "parse error: '%U'",
 449                                 format_unformat_error, line_input);
 450   }
 451
 452   unformat_free (line_input);
 453
 454   if (our_address_set == 0)
 455     return clib_error_return (0, "our address not specified");
 456   if (client_address_set == 0)
 457     return clib_error_return (0, "client address not specified");
 458
 459   rv = create_l2tpv3_ipv6_tunnel (lm, &client_address, &our_address,
 460                                   local_session_id, remote_session_id,
 461                                   local_cookie, remote_cookie,
 462                                   l2_sublayer_present,
 463                                   &sw_if_index);
 464   switch(rv)
 465     {
 466     case 0:
 467       vlib_cli_output(vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main(), sw_if_index);
 468       break;
 469     case VNET_API_ERROR_INVALID_VALUE:
 470       return clib_error_return (0, "session already exists...");
 471
 472     case VNET_API_ERROR_NO_SUCH_ENTRY:
 473       return clib_error_return (0, "session does not exist...");
 474
 475     default:
 476       return clib_error_return (0, "l2tp_session_add_del returned %d", rv);
 477     }
 478
 479   return 0;
 480 }
 481
 482 VLIB_CLI_COMMAND (create_l2tpv3_tunnel_command, static) = {
 483     .path = "create l2tpv3 tunnel",
 484     .short_help =
 485     "create l2tpv3 tunnel client <ip6> our <ip6> local-cookie <hex> remote-cookie <hex> local-session <dec> remote-session <dec>",
 486     .function = create_l2tpv3_tunnel_command_fn,
 487 };
 488
 489 int l2tpv3_set_tunnel_cookies (l2t_main_t * lm,
 490                                u32 sw_if_index,
 491                                u64 new_local_cookie,
 492                                u64 new_remote_cookie)
 493 {
 494     l2t_session_t *s;
 495     vnet_hw_interface_t * hi;
 496     vnet_main_t * vnm = vnet_get_main();
 497     hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
 498
 499     if (pool_is_free_index (lm->sessions, hi->dev_instance))
 500         return VNET_API_ERROR_INVALID_VALUE;
 501
 502     s = pool_elt_at_index (lm->sessions, hi->dev_instance);
 503
 504     s->local_cookie[1] = s->local_cookie[0];
 505     s->local_cookie[0] = clib_host_to_net_u64(new_local_cookie);
 506     s->remote_cookie = clib_host_to_net_u64(new_remote_cookie);
 507
 508     return 0;
 509 }
 510
 511
 512 static clib_error_t *
 513 set_l2tp_tunnel_cookie_command_fn (vlib_main_t * vm,
 514                                 unformat_input_t * input,
 515                                 vlib_cli_command_t * cmd)
 516 {
 517   l2t_main_t *lm = &l2t_main;
 518   vnet_main_t * vnm = vnet_get_main();
 519   u32 sw_if_index = ~0;
 520   u64 local_cookie = (u64)~0, remote_cookie = (u64)~0;
 521
 522   int rv;
 523
 524   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 525     {
 526       if (unformat (input, "%U", unformat_vnet_sw_interface, vnm,
 527                     &sw_if_index))
 528         ;
 529       else if (unformat (input, "local %llx", &local_cookie))
 530         ;
 531       else if (unformat (input, "remote %llx", &remote_cookie))
 532         ;
 533       else
 534         break;
 535     }
 536   if (sw_if_index == ~0)
 537     return clib_error_return (0, "unknown interface");
 538   if (local_cookie == ~0)
 539     return clib_error_return (0, "local cookie required");
 540   if (remote_cookie == ~0)
 541     return clib_error_return (0, "remote cookie required");
 542
 543   rv = l2tpv3_set_tunnel_cookies (lm, sw_if_index,
 544                                   local_cookie, remote_cookie);
 545
 546   switch (rv)
 547     {
 548     case 0:
 549       break;
 550
 551     case VNET_API_ERROR_INVALID_SW_IF_INDEX:
 552       return clib_error_return (0, "invalid interface");
 553
 554     default:
 555       return clib_error_return (0, "l2tp_session_set_cookies returned %d",
 556                                 rv);
 557     }
 558
 559     return 0;
 560 }
 561
 562 VLIB_CLI_COMMAND (set_l2tp_tunnel_cookie_command, static) = {
 563     .path = "set l2tpv3 tunnel cookie",
 564     .short_help =
 565     "set l2tpv3 tunnel cookie <intfc> local <hex> remote <hex>",
 566     .function = set_l2tp_tunnel_cookie_command_fn,
 567 };
 568
 569 int l2tpv3_interface_enable_disable (vnet_main_t * vnm,
 570                                      u32 sw_if_index,
 571                                      int enable_disable)
 572 {
 573   ip6_main_t * im = &ip6_main;
 574   ip_lookup_main_t * lm = &im->lookup_main;
 575   ip_config_main_t * rx_cm = &lm->rx_config_mains[VNET_UNICAST];
 576   u32 ci;
 577   ip6_l2tpv3_config_t config;
 578   u32 feature_index;
 579
 580   if (pool_is_free_index (vnm->interface_main.sw_interfaces, sw_if_index))
 581     return VNET_API_ERROR_INVALID_SW_IF_INDEX;
 582
 583   feature_index = im->ip6_unicast_rx_feature_l2tp_decap;
 584
 585   ci = rx_cm->config_index_by_sw_if_index[sw_if_index];
 586   ci = (enable_disable
 587         ? vnet_config_add_feature
 588         : vnet_config_del_feature)
 589     (vlib_get_main(), &rx_cm->config_main,
 590      ci,
 591      feature_index,
 592      &config,
 593      sizeof (config));
 594   rx_cm->config_index_by_sw_if_index[sw_if_index] = ci;
 595   return 0;
 596 }
 597
 598 /* Enable/disable L2TPv3 intercept on IP6 fowarding path */
 599 static clib_error_t *
 600 set_ip6_l2tpv3 (vlib_main_t * vm,
 601                 unformat_input_t * input,
 602                 vlib_cli_command_t * cmd)
 603 {
 604   u32 sw_if_index = ~0;
 605   int is_add = 1;
 606   int rv;
 607   vnet_main_t * vnm = vnet_get_main();
 608
 609   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
 610     {
 611       if (unformat (input, "%U", unformat_vnet_sw_interface, vnm,
 612                     &sw_if_index))
 613         ;
 614       else if (unformat (input, "del"))
 615         is_add = 0;
 616       else
 617         break;
 618     }
 619
 620   if (sw_if_index == ~0)
 621     return clib_error_return (0, "interface required");
 622
 623   rv = l2tpv3_interface_enable_disable (vnm, sw_if_index, is_add);
 624
 625   switch (rv)
 626     {
 627     case 0:
 628       break;
 629
 630     case VNET_API_ERROR_INVALID_SW_IF_INDEX:
 631       return clib_error_return (0, "invalid interface");
 632
 633     default:
 634       return clib_error_return (0, "l2tp_interface_enable_disable returned %d",
 635                                 rv);
 636     }
 637   return 0;
 638 }
 639
 640 VLIB_CLI_COMMAND (set_interface_ip6_l2tpv3, static) = {
 641   .path = "set interface ip6 l2tpv3",
 642   .function = set_ip6_l2tpv3,
 643   .short_help = "set interface ip6 l2tpv3 <intfc> [del]",
 644 };
 645
 646 static clib_error_t *
 647 l2tp_config (vlib_main_t * vm, unformat_input_t * input)
 648 {
 649     l2t_main_t *lm = &l2t_main;
 650
 651     while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
 652         if (unformat (input, "lookup-v6-src"))
 653             lm->lookup_type = L2T_LOOKUP_SRC_ADDRESS;
 654         else if (unformat (input, "lookup-v6-dst"))
 655             lm->lookup_type = L2T_LOOKUP_DST_ADDRESS;
 656         else if (unformat (input, "lookup-session-id"))
 657             lm->lookup_type = L2T_LOOKUP_SESSION_ID;
 658         else return clib_error_return (0, "unknown input `%U'",
 659                                        format_unformat_error, input);
 660     }
 661     return 0;
 662 }
 663
 664 VLIB_CONFIG_FUNCTION (l2tp_config, "l2tp");
 665
 666
 667 clib_error_t *
 668 l2tp_sw_interface_up_down (vnet_main_t * vnm,
 669                                    u32 sw_if_index,
 670                                    u32 flags)
 671 {
 672   l2t_main_t *lm = &l2t_main;
 673   vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
 674   if (hi->hw_class_index != l2tpv3_hw_class.index)
 675     return 0;
 676
 677   u32 session_index = hi->dev_instance;
 678   l2t_session_t *s = pool_elt_at_index (lm->sessions, session_index);
 679   s->admin_up = !! (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP);
 680   return 0;
 681 }
 682
 683 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (l2tp_sw_interface_up_down);
 684
 685 clib_error_t *l2tp_init (vlib_main_t *vm)
 686 {
 687     l2t_main_t *lm = &l2t_main;
 688     ip_main_t * im = &ip_main;
 689     ip_protocol_info_t * pi;
 690
 691     lm->vnet_main = vnet_get_main();
 692     lm->vlib_main = vm;
 693     lm->lookup_type = L2T_LOOKUP_DST_ADDRESS;
 694
 695     lm->session_by_src_address = hash_create_mem
 696         (0, sizeof (ip6_address_t) /* key bytes */,
 697          sizeof (u32) /* value bytes */);
 698     lm->session_by_dst_address = hash_create_mem
 699         (0, sizeof (ip6_address_t) /* key bytes */,
 700          sizeof (u32) /* value bytes */);
 701     lm->session_by_session_id = hash_create (0, sizeof (uword));
 702
 703     pi = ip_get_protocol_info (im, IP_PROTOCOL_L2TP);
 704     pi->unformat_pg_edit = unformat_pg_l2tp_header;
 705
 706     /* insure these nodes are included in build */
 707     l2tp_encap_init(vm);
 708     l2tp_decap_init();
 709
 710     return 0;
 711 }
 712
 713 VLIB_INIT_FUNCTION(l2tp_init);
 714