vnet/vnet/ip/ip6_forward.c

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 /*
  16  * ip/ip6_forward.c: IP v6 forwarding
  17  *
  18  * Copyright (c) 2008 Eliot Dresselhaus
  19  *
  20  * Permission is hereby granted, free of charge, to any person obtaining
  21  * a copy of this software and associated documentation files (the
  22  * "Software"), to deal in the Software without restriction, including
  23  * without limitation the rights to use, copy, modify, merge, publish,
  24  * distribute, sublicense, and/or sell copies of the Software, and to
  25  * permit persons to whom the Software is furnished to do so, subject to
  26  * the following conditions:
  27  *
  28  * The above copyright notice and this permission notice shall be
  29  * included in all copies or substantial portions of the Software.
  30  *
  31  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  32  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  33  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  34  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  35  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  36  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  37  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  38  */
  39
  40 #include <vnet/vnet.h>
  41 #include <vnet/ip/ip.h>
  42 #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
  43 #include <vnet/srp/srp.h>       /* for srp_hw_interface_class */
  44 #include <vppinfra/cache.h>
  45
  46 #include <vppinfra/bihash_template.c>
  47
  48 static void compute_prefix_lengths_in_search_order (ip6_main_t * im)
  49 {
  50   int i;
  51   vec_reset_length (im->prefix_lengths_in_search_order);
  52   /* Note: bitmap reversed so this is in fact a longest prefix match */
  53   clib_bitmap_foreach (i, im->non_empty_dst_address_length_bitmap,
  54   ({
  55     int dst_address_length = 128 - i;
  56     vec_add1 (im->prefix_lengths_in_search_order, dst_address_length);
  57   }));
  58 }
  59
  60 u32
  61 ip6_fib_lookup_with_table (ip6_main_t * im, u32 fib_index, ip6_address_t * dst)
  62 {
  63   ip_lookup_main_t * lm = &im->lookup_main;
  64   int i, len;
  65   int rv;
  66   BVT(clib_bihash_kv) kv, value;
  67   u64 fib;
  68
  69   len = vec_len (im->prefix_lengths_in_search_order);
  70
  71   kv.key[0] = dst->as_u64[0];
  72   kv.key[1] = dst->as_u64[1];
  73   fib = ((u64)((fib_index))<<32);
  74
  75   for (i = 0; i < len; i++)
  76     {
  77       int dst_address_length = im->prefix_lengths_in_search_order[i];
  78       ip6_address_t * mask = &im->fib_masks[dst_address_length];
  79
  80       ASSERT(dst_address_length >= 0 && dst_address_length <= 128);
  81       //As lengths are decreasing, masks are increasingly specific.
  82       kv.key[0] &= mask->as_u64[0];
  83       kv.key[1] &= mask->as_u64[1];
  84       kv.key[2] = fib | dst_address_length;
  85
  86       rv = BV(clib_bihash_search_inline_2)(&im->ip6_lookup_table, &kv, &value);
  87       if (rv == 0)
  88         return value.value;
  89     }
  90
  91   return lm->miss_adj_index;
  92 }
  93
  94 u32 ip6_fib_lookup (ip6_main_t * im, u32 sw_if_index, ip6_address_t * dst)
  95 {
  96     u32 fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
  97     return ip6_fib_lookup_with_table (im, fib_index, dst);
  98 }
  99
 100 void
 101 vnet_ip6_fib_init (ip6_main_t * im, u32 fib_index)
 102 {
 103   ip_lookup_main_t * lm = &im->lookup_main;
 104   ip6_add_del_route_args_t a;
 105   ip_adjacency_t * adj;
 106
 107   memset(&a, 0x0, sizeof(ip6_add_del_route_args_t));
 108
 109   a.table_index_or_table_id = fib_index;
 110   a.flags = (IP6_ROUTE_FLAG_ADD
 111              | IP6_ROUTE_FLAG_FIB_INDEX
 112              | IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY
 113              | IP6_ROUTE_FLAG_NO_REDISTRIBUTE);
 114
 115   /* Add ff02::1:ff00:0/104 via local route for all tables.
 116      This is required for neighbor discovery to work. */
 117   adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
 118                           &a.adj_index);
 119   adj->lookup_next_index = IP_LOOKUP_NEXT_LOCAL;
 120   adj->if_address_index = ~0;
 121   adj->rewrite_header.data_bytes = 0;
 122
 123   ip6_set_solicited_node_multicast_address (&a.dst_address, 0);
 124
 125   a.dst_address_length = 104;
 126   ip6_add_del_route (im, &a);
 127
 128   /* Add all-routers multicast address via local route for all tables */
 129   adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
 130                           &a.adj_index);
 131   adj->lookup_next_index = IP_LOOKUP_NEXT_LOCAL;
 132   adj->if_address_index = ~0;
 133   adj->rewrite_header.data_bytes = 0;
 134
 135   ip6_set_reserved_multicast_address (&a.dst_address,
 136                                       IP6_MULTICAST_SCOPE_link_local,
 137                                       IP6_MULTICAST_GROUP_ID_all_routers);
 138
 139   a.dst_address_length = 128;
 140   ip6_add_del_route (im, &a);
 141
 142   /* Add all-nodes multicast address via local route for all tables */
 143   adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
 144                           &a.adj_index);
 145   adj->lookup_next_index = IP_LOOKUP_NEXT_LOCAL;
 146   adj->if_address_index = ~0;
 147   adj->rewrite_header.data_bytes = 0;
 148
 149   ip6_set_reserved_multicast_address (&a.dst_address,
 150                                       IP6_MULTICAST_SCOPE_link_local,
 151                                       IP6_MULTICAST_GROUP_ID_all_hosts);
 152
 153   a.dst_address_length = 128;
 154   ip6_add_del_route (im, &a);
 155
 156   /* Add all-mldv2  multicast address via local route for all tables */
 157   adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
 158                           &a.adj_index);
 159   adj->lookup_next_index = IP_LOOKUP_NEXT_LOCAL;
 160   adj->if_address_index = ~0;
 161   adj->rewrite_header.data_bytes = 0;
 162
 163   ip6_set_reserved_multicast_address (&a.dst_address,
 164                                       IP6_MULTICAST_SCOPE_link_local,
 165                                       IP6_MULTICAST_GROUP_ID_mldv2_routers);
 166
 167   a.dst_address_length = 128;
 168   ip6_add_del_route (im, &a);
 169 }
 170
 171 static ip6_fib_t *
 172 create_fib_with_table_id (ip6_main_t * im, u32 table_id)
 173 {
 174   ip6_fib_t * fib;
 175   hash_set (im->fib_index_by_table_id, table_id, vec_len (im->fibs));
 176   vec_add2 (im->fibs, fib, 1);
 177   fib->table_id = table_id;
 178   fib->index = fib - im->fibs;
 179   fib->flow_hash_config = IP_FLOW_HASH_DEFAULT;
 180   vnet_ip6_fib_init (im, fib->index);
 181   return fib;
 182 }
 183
 184 ip6_fib_t *
 185 find_ip6_fib_by_table_index_or_id (ip6_main_t * im, u32 table_index_or_id, u32 flags)
 186 {
 187   uword * p, fib_index;
 188
 189   fib_index = table_index_or_id;
 190   if (! (flags & IP6_ROUTE_FLAG_FIB_INDEX))
 191     {
 192       if (table_index_or_id == ~0) {
 193         table_index_or_id = 0;
 194         while (hash_get (im->fib_index_by_table_id, table_index_or_id)) {
 195           table_index_or_id++;
 196         }
 197         return create_fib_with_table_id (im, table_index_or_id);
 198       }
 199
 200       p = hash_get (im->fib_index_by_table_id, table_index_or_id);
 201       if (! p)
 202         return create_fib_with_table_id (im, table_index_or_id);
 203       fib_index = p[0];
 204     }
 205   return vec_elt_at_index (im->fibs, fib_index);
 206 }
 207
 208 void ip6_add_del_route (ip6_main_t * im, ip6_add_del_route_args_t * a)
 209 {
 210   ip_lookup_main_t * lm = &im->lookup_main;
 211   ip6_fib_t * fib;
 212   ip6_address_t dst_address;
 213   u32 dst_address_length, adj_index;
 214   uword is_del;
 215   u32 old_adj_index = ~0;
 216   BVT(clib_bihash_kv) kv, value;
 217
 218   vlib_smp_unsafe_warning();
 219
 220   is_del = (a->flags & IP6_ROUTE_FLAG_DEL) != 0;
 221
 222   /* Either create new adjacency or use given one depending on arguments. */
 223   if (a->n_add_adj > 0)
 224     {
 225       ip_add_adjacency (lm, a->add_adj, a->n_add_adj, &adj_index);
 226       ip_call_add_del_adjacency_callbacks (lm, adj_index, /* is_del */ 0);
 227     }
 228   else
 229     adj_index = a->adj_index;
 230
 231   dst_address = a->dst_address;
 232   dst_address_length = a->dst_address_length;
 233   fib = find_ip6_fib_by_table_index_or_id (im, a->table_index_or_table_id,
 234                                            a->flags);
 235
 236   ASSERT (dst_address_length < ARRAY_LEN (im->fib_masks));
 237   ip6_address_mask (&dst_address, &im->fib_masks[dst_address_length]);
 238
 239   /* refcount accounting */
 240   if (is_del)
 241     {
 242       ASSERT (im->dst_address_length_refcounts[dst_address_length] > 0);
 243       if (--im->dst_address_length_refcounts[dst_address_length] == 0)
 244         {
 245           im->non_empty_dst_address_length_bitmap =
 246             clib_bitmap_set (im->non_empty_dst_address_length_bitmap,
 247                              128 - dst_address_length, 0);
 248           compute_prefix_lengths_in_search_order (im);
 249         }
 250     }
 251   else
 252     {
 253       im->dst_address_length_refcounts[dst_address_length]++;
 254
 255       im->non_empty_dst_address_length_bitmap =
 256         clib_bitmap_set (im->non_empty_dst_address_length_bitmap,
 257                              128 - dst_address_length, 1);
 258       compute_prefix_lengths_in_search_order (im);
 259     }
 260
 261   kv.key[0] = dst_address.as_u64[0];
 262   kv.key[1] = dst_address.as_u64[1];
 263   kv.key[2] = ((u64)((fib - im->fibs))<<32) | dst_address_length;
 264
 265   if (BV(clib_bihash_search)(&im->ip6_lookup_table, &kv, &value) == 0)
 266     old_adj_index = value.value;
 267
 268   if (is_del)
 269     BV(clib_bihash_add_del) (&im->ip6_lookup_table, &kv, 0 /* is_add */);
 270   else
 271     {
 272       /* Make sure adj index is valid. */
 273       if (CLIB_DEBUG > 0)
 274         (void) ip_get_adjacency (lm, adj_index);
 275
 276       kv.value = adj_index;
 277
 278       BV(clib_bihash_add_del) (&im->ip6_lookup_table, &kv, 1 /* is_add */);
 279     }
 280
 281   /* Avoid spurious reference count increments */
 282   if (old_adj_index == adj_index
 283       && adj_index != ~0
 284       && !(a->flags & IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY))
 285     {
 286       ip_adjacency_t * adj = ip_get_adjacency (lm, adj_index);
 287       if (adj->share_count > 0)
 288         adj->share_count --;
 289     }
 290
 291   /* Delete old adjacency index if present and changed. */
 292   {
 293     if (! (a->flags & IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY)
 294         && old_adj_index != ~0
 295         && old_adj_index != adj_index)
 296       ip_del_adjacency (lm, old_adj_index);
 297   }
 298 }
 299
 300 void
 301 ip6_add_del_route_next_hop (ip6_main_t * im,
 302                             u32 flags,
 303                             ip6_address_t * dst_address,
 304                             u32 dst_address_length,
 305                             ip6_address_t * next_hop,
 306                             u32 next_hop_sw_if_index,
 307                             u32 next_hop_weight, u32 adj_index,
 308                             u32 explicit_fib_index)
 309 {
 310   vnet_main_t * vnm = vnet_get_main();
 311   ip_lookup_main_t * lm = &im->lookup_main;
 312   u32 fib_index;
 313   ip6_fib_t * fib;
 314   ip6_address_t masked_dst_address;
 315   u32 old_mp_adj_index, new_mp_adj_index;
 316   u32 dst_adj_index, nh_adj_index;
 317   int rv;
 318   ip_adjacency_t * dst_adj;
 319   ip_multipath_adjacency_t * old_mp, * new_mp;
 320   int is_del = (flags & IP6_ROUTE_FLAG_DEL) != 0;
 321   int is_interface_next_hop;
 322   clib_error_t * error = 0;
 323   uword * nh_result;
 324   BVT(clib_bihash_kv) kv, value;
 325
 326   vlib_smp_unsafe_warning();
 327
 328   if (explicit_fib_index == (u32)~0)
 329     fib_index = vec_elt (im->fib_index_by_sw_if_index, next_hop_sw_if_index);
 330   else
 331     fib_index = explicit_fib_index;
 332
 333   fib = vec_elt_at_index (im->fibs, fib_index);
 334
 335   /* Lookup next hop to be added or deleted. */
 336   is_interface_next_hop = ip6_address_is_zero (next_hop);
 337   if (adj_index == (u32)~0)
 338     {
 339       if (is_interface_next_hop)
 340         {
 341           nh_result = hash_get (im->interface_route_adj_index_by_sw_if_index,
 342                                 next_hop_sw_if_index);
 343           if (nh_result)
 344             nh_adj_index = *nh_result;
 345           else
 346             {
 347               ip_adjacency_t * adj;
 348               adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
 349                                       &nh_adj_index);
 350               ip6_adjacency_set_interface_route (vnm, adj,
 351                                                  next_hop_sw_if_index, ~0);
 352               ip_call_add_del_adjacency_callbacks
 353                 (lm, nh_adj_index, /* is_del */ 0);
 354               hash_set (im->interface_route_adj_index_by_sw_if_index,
 355                         next_hop_sw_if_index, nh_adj_index);
 356             }
 357         }
 358       else
 359         {
 360           /* Look for the interface /128 route */
 361           kv.key[0] = next_hop->as_u64[0];
 362           kv.key[1] = next_hop->as_u64[1];
 363           kv.key[2] = ((u64)((fib - im->fibs))<<32) | 128;
 364
 365           if (BV(clib_bihash_search)(&im->ip6_lookup_table, &kv, &value) < 0)
 366           {
 367             ip_adjacency_t * adj;
 368             nh_adj_index = ip6_fib_lookup_with_table (im, fib_index, next_hop);
 369             adj = ip_get_adjacency (lm, nh_adj_index);
 370             /* if ND interface adjacencty is present, we need to
 371                              install ND adjaceny for specific next hop */
 372             if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP &&
 373                 adj->arp.next_hop.ip6.as_u64[0] == 0 &&
 374                 adj->arp.next_hop.ip6.as_u64[1] == 0)
 375             {
 376               nh_adj_index = vnet_ip6_neighbor_glean_add(fib_index, next_hop);
 377             }
 378             else
 379             {
 380               ip_adjacency_t add_adj;
 381               memset (&add_adj, 0, sizeof(add_adj));
 382               add_adj.n_adj = 1;
 383               add_adj.lookup_next_index = IP_LOOKUP_NEXT_INDIRECT;
 384               add_adj.indirect.next_hop.ip6.as_u64[0] = next_hop->as_u64[0];
 385               add_adj.indirect.next_hop.ip6.as_u64[1] = next_hop->as_u64[1];
 386               add_adj.explicit_fib_index = explicit_fib_index;
 387               ip_add_adjacency (lm, &add_adj, 1, &nh_adj_index);
 388             }
 389           }
 390           else
 391             nh_adj_index = value.value;
 392
 393         }
 394     }
 395   else
 396     {
 397       /* Look for the interface /128 route */
 398       kv.key[0] = next_hop->as_u64[0];
 399       kv.key[1] = next_hop->as_u64[1];
 400       kv.key[2] = ((u64)((fib - im->fibs))<<32) | 128;
 401
 402       if (BV(clib_bihash_search)(&im->ip6_lookup_table, &kv, &value) < 0)
 403         {
 404           vnm->api_errno = VNET_API_ERROR_UNKNOWN_DESTINATION;
 405           error = clib_error_return (0, "next-hop %U/128 not in FIB",
 406                                      format_ip6_address, next_hop);
 407           goto done;
 408         }
 409
 410       nh_adj_index = value.value;
 411     }
 412
 413   ASSERT (dst_address_length < ARRAY_LEN (im->fib_masks));
 414   masked_dst_address = dst_address[0];
 415   ip6_address_mask (&masked_dst_address, &im->fib_masks[dst_address_length]);
 416
 417   kv.key[0] = masked_dst_address.as_u64[0];
 418   kv.key[1] = masked_dst_address.as_u64[1];
 419   kv.key[2] = ((u64)((fib - im->fibs))<<32) | dst_address_length;
 420
 421   rv = BV(clib_bihash_search)(&im->ip6_lookup_table, &kv, &value);
 422
 423   if (rv == 0)
 424     {
 425       dst_adj_index = value.value;
 426       dst_adj = ip_get_adjacency (lm, dst_adj_index);
 427     }
 428   else
 429     {
 430       /* For deletes destination must be known. */
 431       if (is_del)
 432         {
 433           vnm->api_errno = VNET_API_ERROR_UNKNOWN_DESTINATION;
 434           error = clib_error_return (0, "unknown destination %U/%d",
 435                                      format_ip6_address, dst_address,
 436                                      dst_address_length);
 437           goto done;
 438         }
 439
 440       dst_adj_index = ~0;
 441       dst_adj = 0;
 442     }
 443
 444   /* Ignore adds of X/128 with next hop of X. */
 445   if (! is_del
 446       && dst_address_length == 128
 447       && ip6_address_is_equal (dst_address, next_hop))
 448     {
 449       vnm->api_errno = VNET_API_ERROR_PREFIX_MATCHES_NEXT_HOP;
 450       error = clib_error_return (0, "prefix matches next hop %U/%d",
 451                                  format_ip6_address, dst_address,
 452                                  dst_address_length);
 453       goto done;
 454     }
 455
 456   /* Destination is not known and default weight is set so add route
 457      to existing non-multipath adjacency */
 458   if (dst_adj_index == ~0 && next_hop_weight == 1 && next_hop_sw_if_index == ~0)
 459   {
 460     /* create new adjacency */
 461     ip6_add_del_route_args_t a;
 462     a.table_index_or_table_id = fib_index;
 463     a.flags = ((is_del ? IP6_ROUTE_FLAG_DEL : IP6_ROUTE_FLAG_ADD)
 464         | IP6_ROUTE_FLAG_FIB_INDEX
 465         | IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY
 466         | (flags & (IP6_ROUTE_FLAG_NO_REDISTRIBUTE
 467             | IP6_ROUTE_FLAG_NOT_LAST_IN_GROUP)));
 468     a.dst_address = dst_address[0];
 469     a.dst_address_length = dst_address_length;
 470     a.adj_index = nh_adj_index;
 471     a.add_adj = 0;
 472     a.n_add_adj = 0;
 473
 474     ip6_add_del_route (im, &a);
 475     goto done;
 476   }
 477
 478   old_mp_adj_index = dst_adj ? dst_adj->heap_handle : ~0;
 479
 480   if (! ip_multipath_adjacency_add_del_next_hop
 481       (lm, is_del,
 482        dst_adj ? dst_adj->heap_handle : ~0,
 483        nh_adj_index,
 484        next_hop_weight,
 485        &new_mp_adj_index))
 486     {
 487       vnm->api_errno = VNET_API_ERROR_NEXT_HOP_NOT_FOUND_MP;
 488       error = clib_error_return
 489         (0, "requested deleting next-hop %U not found in multi-path",
 490          format_ip6_address, next_hop);
 491       goto done;
 492     }
 493
 494   old_mp = new_mp = 0;
 495   if (old_mp_adj_index != ~0)
 496     old_mp = vec_elt_at_index (lm->multipath_adjacencies, old_mp_adj_index);
 497   if (new_mp_adj_index != ~0)
 498     new_mp = vec_elt_at_index (lm->multipath_adjacencies, new_mp_adj_index);
 499
 500   if (old_mp != new_mp)
 501     {
 502       ip6_add_del_route_args_t a;
 503       a.table_index_or_table_id = fib_index;
 504       a.flags = ((is_del ? IP6_ROUTE_FLAG_DEL : IP6_ROUTE_FLAG_ADD)
 505                  | IP6_ROUTE_FLAG_FIB_INDEX
 506                  | IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY
 507                  | (flags & IP6_ROUTE_FLAG_NO_REDISTRIBUTE));
 508       a.dst_address = dst_address[0];
 509       a.dst_address_length = dst_address_length;
 510       a.adj_index = new_mp ? new_mp->adj_index : dst_adj_index;
 511       a.add_adj = 0;
 512       a.n_add_adj = 0;
 513
 514       ip6_add_del_route (im, &a);
 515     }
 516
 517  done:
 518   if (error)
 519     clib_error_report (error);
 520 }
 521
 522 u32
 523 ip6_get_route (ip6_main_t * im,
 524                u32 table_index_or_table_id,
 525                u32 flags,
 526                ip6_address_t * address,
 527                u32 address_length)
 528 {
 529   ip6_fib_t * fib = find_ip6_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
 530   ip6_address_t masked_address;
 531   BVT(clib_bihash_kv) kv, value;
 532
 533   ASSERT (address_length < ARRAY_LEN (im->fib_masks));
 534   clib_memcpy (&masked_address, address, sizeof (masked_address));
 535   ip6_address_mask (&masked_address, &im->fib_masks[address_length]);
 536
 537   kv.key[0] = masked_address.as_u64[0];
 538   kv.key[1] = masked_address.as_u64[1];
 539   kv.key[2] = ((u64)((fib - im->fibs))<<32) | address_length;
 540
 541   if (BV(clib_bihash_search)(&im->ip6_lookup_table, &kv, &value) == 0)
 542     return (value.value);
 543   return 0;
 544 }
 545
 546 void
 547 ip6_foreach_matching_route (ip6_main_t * im,
 548                             u32 table_index_or_table_id,
 549                             u32 flags,
 550                             ip6_address_t * dst_address,
 551                             u32 address_length,
 552                             ip6_address_t ** results,
 553                             u8 ** result_lengths)
 554 {
 555   ip6_fib_t * fib =
 556     find_ip6_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
 557   BVT(clib_bihash) * h = &im->ip6_lookup_table;
 558   BVT(clib_bihash_value) * v;
 559   clib_bihash_bucket_t * b;
 560   int i, j, k;
 561
 562   if (*results)
 563     _vec_len (*results) = 0;
 564   if (*result_lengths)
 565     _vec_len (*result_lengths) = 0;
 566
 567   /* Walk the table looking for routes which match the supplied address */
 568   for (i = 0; i < h->nbuckets; i++)
 569     {
 570       b = &h->buckets [i];
 571       if (b->offset == 0)
 572           continue;
 573
 574       v = BV(clib_bihash_get_value) (h, b->offset);
 575       for (j = 0; j < (1<<b->log2_pages); j++)
 576         {
 577           for (k = 0; k < BIHASH_KVP_PER_PAGE; k++)
 578             {
 579               if (BV(clib_bihash_is_free)(&v->kvp[k]))
 580                 continue;
 581
 582               if ((v->kvp[k].key[2]
 583                    == (((u64)((fib - im->fibs))<<32) | address_length))
 584                   && ip6_destination_matches_route
 585                   (im, dst_address, (ip6_address_t *) &v->kvp[k],
 586                    address_length))
 587                 {
 588                   ip6_address_t * a;
 589
 590                   a = (ip6_address_t *)(&v->kvp[k]);
 591
 592                   vec_add1 (*results, a[0]);
 593                   vec_add1 (*result_lengths, address_length);
 594                 }
 595             }
 596           v++;
 597         }
 598     }
 599 }
 600
 601 void ip6_maybe_remap_adjacencies (ip6_main_t * im,
 602                                   u32 table_index_or_table_id,
 603                                   u32 flags)
 604 {
 605 #if SOONE
 606   ip6_fib_t * fib
 607     = find_ip6_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
 608 #endif
 609   ip_lookup_main_t * lm = &im->lookup_main;
 610
 611   if (lm->n_adjacency_remaps == 0)
 612     return;
 613
 614   clib_warning ("unimplemented, please report to vpp-dev@cisco.com");
 615
 616   /* All remaps have been performed. */
 617   lm->n_adjacency_remaps = 0;
 618 }
 619
 620 void ip6_delete_matching_routes (ip6_main_t * im,
 621                                  u32 table_index_or_table_id,
 622                                  u32 flags,
 623                                  ip6_address_t * address,
 624                                  u32 address_length)
 625 {
 626   /* $$$$ static may be OK - this should happen only on thread 0 */
 627   static ip6_address_t * matching_addresses;
 628   static u8 * matching_address_lengths;
 629   u32 l, i;
 630   ip6_add_del_route_args_t a;
 631
 632   vlib_smp_unsafe_warning();
 633
 634   a.flags = IP6_ROUTE_FLAG_DEL | IP6_ROUTE_FLAG_NO_REDISTRIBUTE | flags;
 635   a.table_index_or_table_id = table_index_or_table_id;
 636   a.adj_index = ~0;
 637   a.add_adj = 0;
 638   a.n_add_adj = 0;
 639
 640   for (l = address_length + 1; l <= 128; l++)
 641     {
 642       ip6_foreach_matching_route (im, table_index_or_table_id, flags,
 643                                   address,
 644                                   l,
 645                                   &matching_addresses,
 646                                   &matching_address_lengths);
 647       for (i = 0; i < vec_len (matching_addresses); i++)
 648         {
 649           a.dst_address = matching_addresses[i];
 650           a.dst_address_length = matching_address_lengths[i];
 651           ip6_add_del_route (im, &a);
 652         }
 653     }
 654
 655   ip6_maybe_remap_adjacencies (im, table_index_or_table_id, flags);
 656 }
 657
 658 void
 659 ip6_forward_next_trace (vlib_main_t * vm,
 660                         vlib_node_runtime_t * node,
 661                         vlib_frame_t * frame,
 662                         vlib_rx_or_tx_t which_adj_index);
 663
 664 always_inline uword
 665 ip6_lookup_inline (vlib_main_t * vm,
 666                    vlib_node_runtime_t * node,
 667                    vlib_frame_t * frame,
 668                    int is_indirect)
 669 {
 670   ip6_main_t * im = &ip6_main;
 671   ip_lookup_main_t * lm = &im->lookup_main;
 672   vlib_combined_counter_main_t * cm = &im->lookup_main.adjacency_counters;
 673   u32 n_left_from, n_left_to_next, * from, * to_next;
 674   ip_lookup_next_t next;
 675   u32 cpu_index = os_get_cpu_number();
 676
 677   from = vlib_frame_vector_args (frame);
 678   n_left_from = frame->n_vectors;
 679   next = node->cached_next_index;
 680
 681   while (n_left_from > 0)
 682     {
 683       vlib_get_next_frame (vm, node, next,
 684                            to_next, n_left_to_next);
 685
 686       while (n_left_from >= 4 && n_left_to_next >= 2)
 687         {
 688           vlib_buffer_t * p0, * p1;
 689           u32 pi0, pi1, adj_index0, adj_index1, wrong_next;
 690           ip_lookup_next_t next0, next1;
 691           ip6_header_t * ip0, * ip1;
 692           ip_adjacency_t * adj0, * adj1;
 693           ip6_address_t * dst_addr0, * dst_addr1;
 694           u32 fib_index0, fib_index1;
 695           u32 flow_hash_config0, flow_hash_config1;
 696
 697           /* Prefetch next iteration. */
 698           {
 699             vlib_buffer_t * p2, * p3;
 700
 701             p2 = vlib_get_buffer (vm, from[2]);
 702             p3 = vlib_get_buffer (vm, from[3]);
 703
 704             vlib_prefetch_buffer_header (p2, LOAD);
 705             vlib_prefetch_buffer_header (p3, LOAD);
 706             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
 707             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
 708           }
 709
 710           pi0 = to_next[0] = from[0];
 711           pi1 = to_next[1] = from[1];
 712
 713           p0 = vlib_get_buffer (vm, pi0);
 714           p1 = vlib_get_buffer (vm, pi1);
 715
 716           ip0 = vlib_buffer_get_current (p0);
 717           ip1 = vlib_buffer_get_current (p1);
 718
 719           if (is_indirect)
 720             {
 721               ip_adjacency_t * iadj0, * iadj1;
 722               iadj0 = ip_get_adjacency (lm, vnet_buffer(p0)->ip.adj_index[VLIB_TX]);
 723               iadj1 = ip_get_adjacency (lm, vnet_buffer(p1)->ip.adj_index[VLIB_TX]);
 724               dst_addr0 = &iadj0->indirect.next_hop.ip6;
 725               dst_addr1 = &iadj1->indirect.next_hop.ip6;
 726             }
 727           else
 728             {
 729               dst_addr0 = &ip0->dst_address;
 730               dst_addr1 = &ip1->dst_address;
 731             }
 732
 733           fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
 734           fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]);
 735
 736           fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
 737             fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
 738           fib_index1 = (vnet_buffer(p1)->sw_if_index[VLIB_TX] == (u32)~0) ?
 739             fib_index1 : vnet_buffer(p1)->sw_if_index[VLIB_TX];
 740
 741           adj_index0 = ip6_fib_lookup_with_table (im, fib_index0, dst_addr0);
 742           adj_index1 = ip6_fib_lookup_with_table (im, fib_index1, dst_addr1);
 743
 744           adj0 = ip_get_adjacency (lm, adj_index0);
 745           adj1 = ip_get_adjacency (lm, adj_index1);
 746
 747           if (PREDICT_FALSE (adj0->explicit_fib_index != ~0))
 748             {
 749               adj_index0 = ip6_fib_lookup_with_table
 750                 (im, adj0->explicit_fib_index, dst_addr0);
 751               adj0 = ip_get_adjacency (lm, adj_index0);
 752             }
 753           if (PREDICT_FALSE (adj1->explicit_fib_index != ~0))
 754             {
 755               adj_index1 = ip6_fib_lookup_with_table
 756                 (im, adj1->explicit_fib_index, dst_addr1);
 757               adj1 = ip_get_adjacency (lm, adj_index1);
 758             }
 759
 760           next0 = adj0->lookup_next_index;
 761           next1 = adj1->lookup_next_index;
 762
 763           /* Only process the HBH Option Header if explicitly configured to do so */
 764           next0 = (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) && im->hbh_enabled &&
 765             adj_index0 ? IP6_LOOKUP_NEXT_HOP_BY_HOP : adj0->lookup_next_index;
 766           next1 = (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) && im->hbh_enabled &&
 767             adj_index1 ? IP6_LOOKUP_NEXT_HOP_BY_HOP : adj1->lookup_next_index;
 768
 769           vnet_buffer (p0)->ip.flow_hash =
 770             vnet_buffer(p1)->ip.flow_hash = 0;
 771
 772           if (PREDICT_FALSE(adj0->n_adj > 1))
 773             {
 774               flow_hash_config0 =
 775                 vec_elt_at_index (im->fibs,fib_index0)->flow_hash_config;
 776               vnet_buffer (p0)->ip.flow_hash =
 777                 ip6_compute_flow_hash (ip0, flow_hash_config0);
 778             }
 779
 780           if (PREDICT_FALSE(adj1->n_adj > 1))
 781             {
 782               flow_hash_config1 =
 783                 vec_elt_at_index (im->fibs,fib_index0)->flow_hash_config;
 784
 785               vnet_buffer (p1)->ip.flow_hash =
 786                 ip6_compute_flow_hash (ip1, flow_hash_config1);
 787             }
 788
 789           ASSERT (adj0->n_adj > 0);
 790           ASSERT (adj1->n_adj > 0);
 791           ASSERT (is_pow2 (adj0->n_adj));
 792           ASSERT (is_pow2 (adj1->n_adj));
 793           adj_index0 += (vnet_buffer (p0)->ip.flow_hash & (adj0->n_adj - 1));
 794           adj_index1 += (vnet_buffer (p1)->ip.flow_hash & (adj1->n_adj - 1));
 795
 796           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
 797           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = adj_index1;
 798
 799           vlib_increment_combined_counter
 800               (cm, cpu_index, adj_index0, 1,
 801                vlib_buffer_length_in_chain (vm, p0));
 802           vlib_increment_combined_counter
 803               (cm, cpu_index, adj_index1, 1,
 804                vlib_buffer_length_in_chain (vm, p1));
 805
 806           from += 2;
 807           to_next += 2;
 808           n_left_to_next -= 2;
 809           n_left_from -= 2;
 810
 811           wrong_next = (next0 != next) + 2*(next1 != next);
 812           if (PREDICT_FALSE (wrong_next != 0))
 813             {
 814               switch (wrong_next)
 815                 {
 816                 case 1:
 817                   /* A B A */
 818                   to_next[-2] = pi1;
 819                   to_next -= 1;
 820                   n_left_to_next += 1;
 821                   vlib_set_next_frame_buffer (vm, node, next0, pi0);
 822                   break;
 823
 824                 case 2:
 825                   /* A A B */
 826                   to_next -= 1;
 827                   n_left_to_next += 1;
 828                   vlib_set_next_frame_buffer (vm, node, next1, pi1);
 829                   break;
 830
 831                 case 3:
 832                   /* A B C */
 833                   to_next -= 2;
 834                   n_left_to_next += 2;
 835                   vlib_set_next_frame_buffer (vm, node, next0, pi0);
 836                   vlib_set_next_frame_buffer (vm, node, next1, pi1);
 837                   if (next0 == next1)
 838                     {
 839                       /* A B B */
 840                       vlib_put_next_frame (vm, node, next, n_left_to_next);
 841                       next = next1;
 842                       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 843                     }
 844                 }
 845             }
 846         }
 847
 848       while (n_left_from > 0 && n_left_to_next > 0)
 849         {
 850           vlib_buffer_t * p0;
 851           ip6_header_t * ip0;
 852           u32 pi0, adj_index0;
 853           ip_lookup_next_t next0;
 854           ip_adjacency_t * adj0;
 855           ip6_address_t * dst_addr0;
 856           u32 fib_index0, flow_hash_config0;
 857
 858           pi0 = from[0];
 859           to_next[0] = pi0;
 860
 861           p0 = vlib_get_buffer (vm, pi0);
 862
 863           ip0 = vlib_buffer_get_current (p0);
 864
 865           if (is_indirect)
 866             {
 867               ip_adjacency_t * iadj0;
 868               iadj0 = ip_get_adjacency (lm, vnet_buffer(p0)->ip.adj_index[VLIB_TX]);
 869               dst_addr0 = &iadj0->indirect.next_hop.ip6;
 870             }
 871           else
 872             {
 873               dst_addr0 = &ip0->dst_address;
 874             }
 875
 876           fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
 877           fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
 878             fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
 879
 880           flow_hash_config0 =
 881               vec_elt_at_index (im->fibs,fib_index0)->flow_hash_config;
 882
 883           adj_index0 = ip6_fib_lookup_with_table (im, fib_index0, dst_addr0);
 884
 885           adj0 = ip_get_adjacency (lm, adj_index0);
 886
 887           if (PREDICT_FALSE (adj0->explicit_fib_index != ~0))
 888             {
 889               adj_index0 = ip6_fib_lookup_with_table
 890                 (im, adj0->explicit_fib_index, dst_addr0);
 891               adj0 = ip_get_adjacency (lm, adj_index0);
 892             }
 893
 894           /* Only process the HBH Option Header if explicitly configured to do so */
 895           next0 = (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) && im->hbh_enabled &&
 896             adj_index0 ? IP6_LOOKUP_NEXT_HOP_BY_HOP : adj0->lookup_next_index;
 897
 898           vnet_buffer (p0)->ip.flow_hash = 0;
 899
 900           if (PREDICT_FALSE(adj0->n_adj > 1))
 901             {
 902               flow_hash_config0 =
 903                 vec_elt_at_index (im->fibs,fib_index0)->flow_hash_config;
 904               vnet_buffer (p0)->ip.flow_hash =
 905                 ip6_compute_flow_hash (ip0, flow_hash_config0);
 906             }
 907
 908           ASSERT (adj0->n_adj > 0);
 909           ASSERT (is_pow2 (adj0->n_adj));
 910           adj_index0 += (vnet_buffer (p0)->ip.flow_hash & (adj0->n_adj - 1));
 911
 912           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
 913
 914           vlib_increment_combined_counter
 915               (cm, cpu_index, adj_index0, 1,
 916                vlib_buffer_length_in_chain (vm, p0));
 917
 918           from += 1;
 919           to_next += 1;
 920           n_left_to_next -= 1;
 921           n_left_from -= 1;
 922
 923           if (PREDICT_FALSE (next0 != next))
 924             {
 925               n_left_to_next += 1;
 926               vlib_put_next_frame (vm, node, next, n_left_to_next);
 927               next = next0;
 928               vlib_get_next_frame (vm, node, next,
 929                                    to_next, n_left_to_next);
 930               to_next[0] = pi0;
 931               to_next += 1;
 932               n_left_to_next -= 1;
 933             }
 934         }
 935
 936       vlib_put_next_frame (vm, node, next, n_left_to_next);
 937     }
 938
 939   if (node->flags & VLIB_NODE_FLAG_TRACE)
 940       ip6_forward_next_trace(vm, node, frame, VLIB_TX);
 941
 942   return frame->n_vectors;
 943 }
 944
 945 void ip6_adjacency_set_interface_route (vnet_main_t * vnm,
 946                                         ip_adjacency_t * adj,
 947                                         u32 sw_if_index,
 948                                         u32 if_address_index)
 949 {
 950   vnet_hw_interface_t * hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
 951   ip_lookup_next_t n;
 952   u32 node_index;
 953
 954   if (hw->hw_class_index == ethernet_hw_interface_class.index
 955       || hw->hw_class_index == srp_hw_interface_class.index)
 956     {
 957       n = IP_LOOKUP_NEXT_ARP;
 958       node_index = ip6_discover_neighbor_node.index;
 959       adj->if_address_index = if_address_index;
 960       adj->arp.next_hop.ip6.as_u64[0] = 0;
 961       adj->arp.next_hop.ip6.as_u64[1] = 0;
 962   }
 963   else
 964     {
 965       n = IP_LOOKUP_NEXT_REWRITE;
 966       node_index = ip6_rewrite_node.index;
 967     }
 968
 969  adj->lookup_next_index = n;
 970  adj->explicit_fib_index = ~0;
 971
 972  vnet_rewrite_for_sw_interface
 973    (vnm,
 974     VNET_L3_PACKET_TYPE_IP6,
 975     sw_if_index,
 976     node_index,
 977     VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST,
 978     &adj->rewrite_header,
 979     sizeof (adj->rewrite_data));
 980 }
 981
 982 static void
 983 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 984                           ip6_main_t * im, u32 fib_index,
 985                           ip_interface_address_t * a)
 986 {
 987   ip_lookup_main_t * lm = &im->lookup_main;
 988   ip_adjacency_t * adj;
 989   ip6_address_t * address = ip_interface_address_get_address (lm, a);
 990   ip6_add_del_route_args_t x;
 991   vnet_hw_interface_t * hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
 992   u32 classify_table_index;
 993
 994   /* Add e.g. 1.0.0.0/8 as interface route (arp for Ethernet). */
 995   x.table_index_or_table_id = fib_index;
 996   x.flags = (IP6_ROUTE_FLAG_ADD
 997              | IP6_ROUTE_FLAG_FIB_INDEX
 998              | IP6_ROUTE_FLAG_NO_REDISTRIBUTE);
 999   x.dst_address = address[0];
1000   x.dst_address_length = a->address_length;
1001   x.n_add_adj = 0;
1002   x.add_adj = 0;
1003
1004   a->neighbor_probe_adj_index = ~0;
1005   if (a->address_length < 128)
1006     {
1007       adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
1008                               &x.adj_index);
1009       ip6_adjacency_set_interface_route (vnm, adj, sw_if_index, a - lm->if_address_pool);
1010       ip_call_add_del_adjacency_callbacks (lm, x.adj_index, /* is_del */ 0);
1011       ip6_add_del_route (im, &x);
1012       a->neighbor_probe_adj_index = x.adj_index;
1013     }
1014
1015   /* Add e.g. ::1/128 as local to this host. */
1016   adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
1017                           &x.adj_index);
1018
1019   classify_table_index = ~0;
1020   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
1021     classify_table_index = lm->classify_table_index_by_sw_if_index [sw_if_index];
1022   if (classify_table_index != (u32) ~0)
1023     {
1024       adj->lookup_next_index = IP_LOOKUP_NEXT_CLASSIFY;
1025       adj->classify.table_index = classify_table_index;
1026     }
1027   else
1028     adj->lookup_next_index = IP_LOOKUP_NEXT_LOCAL;
1029
1030   adj->if_address_index = a - lm->if_address_pool;
1031   adj->rewrite_header.sw_if_index = sw_if_index;
1032   adj->rewrite_header.max_l3_packet_bytes = hw_if->max_l3_packet_bytes[VLIB_RX];
1033   adj->rewrite_header.data_bytes = 0;
1034   ip_call_add_del_adjacency_callbacks (lm, x.adj_index, /* is_del */ 0);
1035   x.dst_address_length = 128;
1036   ip6_add_del_route (im, &x);
1037 }
1038
1039 static void
1040 ip6_del_interface_routes (ip6_main_t * im, u32 fib_index,
1041                           ip6_address_t * address, u32 address_length)
1042 {
1043   ip6_add_del_route_args_t x;
1044
1045   /* Add e.g. 1.0.0.0/8 as interface route (arp for Ethernet). */
1046   x.table_index_or_table_id = fib_index;
1047   x.flags = (IP6_ROUTE_FLAG_DEL
1048              | IP6_ROUTE_FLAG_FIB_INDEX
1049              | IP6_ROUTE_FLAG_NO_REDISTRIBUTE);
1050   x.dst_address = address[0];
1051   x.dst_address_length = address_length;
1052   x.adj_index = ~0;
1053   x.n_add_adj = 0;
1054   x.add_adj = 0;
1055
1056   if (address_length < 128)
1057     {
1058       /* Don't wipe out fe80::0/64 */
1059       if (address_length != 64 ||
1060           address[0].as_u64[0] != clib_net_to_host_u64(0xfe80000000000000ULL))
1061         ip6_add_del_route (im, &x);
1062     }
1063
1064   x.dst_address_length = 128;
1065   ip6_add_del_route (im, &x);
1066
1067   ip6_delete_matching_routes (im,
1068                               fib_index,
1069                               IP6_ROUTE_FLAG_FIB_INDEX,
1070                               address,
1071                               address_length);
1072 }
1073
1074 typedef struct {
1075     u32 sw_if_index;
1076     ip6_address_t address;
1077     u32 length;
1078 } ip6_interface_address_t;
1079
1080 static clib_error_t *
1081 ip6_add_del_interface_address_internal (vlib_main_t * vm,
1082                                         u32 sw_if_index,
1083                                         ip6_address_t * new_address,
1084                                         u32 new_length,
1085                                         u32 redistribute,
1086                                         u32 insert_routes,
1087                                         u32 is_del);
1088
1089 static clib_error_t *
1090 ip6_add_del_interface_address_internal (vlib_main_t * vm,
1091                                         u32 sw_if_index,
1092                                         ip6_address_t * address,
1093                                         u32 address_length,
1094                                         u32 redistribute,
1095                                         u32 insert_routes,
1096                                         u32 is_del)
1097 {
1098   vnet_main_t * vnm = vnet_get_main();
1099   ip6_main_t * im = &ip6_main;
1100   ip_lookup_main_t * lm = &im->lookup_main;
1101   clib_error_t * error;
1102   u32 if_address_index;
1103   ip6_address_fib_t ip6_af, * addr_fib = 0;
1104
1105   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1106   ip6_addr_fib_init (&ip6_af, address,
1107                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
1108   vec_add1 (addr_fib, ip6_af);
1109
1110   {
1111     uword elts_before = pool_elts (lm->if_address_pool);
1112
1113     error = ip_interface_address_add_del
1114       (lm,
1115        sw_if_index,
1116        addr_fib,
1117        address_length,
1118        is_del,
1119        &if_address_index);
1120     if (error)
1121       goto done;
1122
1123     /* Pool did not grow: add duplicate address. */
1124     if (elts_before == pool_elts (lm->if_address_pool))
1125       goto done;
1126   }
1127
1128   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index) && insert_routes)
1129     {
1130       if (is_del)
1131         ip6_del_interface_routes (im, ip6_af.fib_index, address,
1132                                   address_length);
1133
1134       else
1135         ip6_add_interface_routes (vnm, sw_if_index,
1136                                   im, ip6_af.fib_index,
1137                                   pool_elt_at_index (lm->if_address_pool, if_address_index));
1138     }
1139
1140   {
1141     ip6_add_del_interface_address_callback_t * cb;
1142     vec_foreach (cb, im->add_del_interface_address_callbacks)
1143       cb->function (im, cb->function_opaque, sw_if_index,
1144                     address, address_length,
1145                     if_address_index,
1146                     is_del);
1147   }
1148
1149  done:
1150   vec_free (addr_fib);
1151   return error;
1152 }
1153
1154 clib_error_t *
1155 ip6_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
1156                                ip6_address_t * address, u32 address_length,
1157                                u32 is_del)
1158 {
1159   return ip6_add_del_interface_address_internal
1160     (vm, sw_if_index, address, address_length,
1161      /* redistribute */ 1,
1162      /* insert_routes */ 1,
1163      is_del);
1164 }
1165
1166 clib_error_t *
1167 ip6_sw_interface_admin_up_down (vnet_main_t * vnm,
1168                                 u32 sw_if_index,
1169                                 u32 flags)
1170 {
1171   ip6_main_t * im = &ip6_main;
1172   ip_interface_address_t * ia;
1173   ip6_address_t * a;
1174   u32 is_admin_up, fib_index;
1175
1176   /* Fill in lookup tables with default table (0). */
1177   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1178
1179   vec_validate_init_empty (im->lookup_main.if_address_pool_index_by_sw_if_index, sw_if_index, ~0);
1180
1181   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
1182
1183   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
1184
1185   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
1186                                 0 /* honor unnumbered */,
1187   ({
1188     a = ip_interface_address_get_address (&im->lookup_main, ia);
1189     if (is_admin_up)
1190       ip6_add_interface_routes (vnm, sw_if_index,
1191                                 im, fib_index,
1192                                 ia);
1193     else
1194       ip6_del_interface_routes (im, fib_index,
1195                                 a, ia->address_length);
1196   }));
1197
1198   return 0;
1199 }
1200
1201 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
1202
1203 /* Built-in ip6 unicast rx feature path definition */
1204 VNET_IP6_UNICAST_FEATURE_INIT (ip6_inacl, static) = {
1205   .node_name = "ip6-inacl",
1206   .runs_before = {"ipsec-input-ip6", 0},
1207   .feature_index = &ip6_main.ip6_unicast_rx_feature_check_access,
1208 };
1209
1210 VNET_IP6_UNICAST_FEATURE_INIT (ip6_ipsec, static) = {
1211   .node_name = "ipsec-input-ip6",
1212   .runs_before = {"l2tp-decap", 0},
1213   .feature_index = &ip6_main.ip6_unicast_rx_feature_ipsec,
1214 };
1215
1216 VNET_IP6_UNICAST_FEATURE_INIT (ip6_l2tp, static) = {
1217   .node_name = "l2tp-decap",
1218   .runs_before = {"vpath-input-ip6", 0},
1219   .feature_index = &ip6_main.ip6_unicast_rx_feature_l2tp_decap,
1220 };
1221
1222 VNET_IP6_UNICAST_FEATURE_INIT (ip6_vpath, static) = {
1223   .node_name = "vpath-input-ip6",
1224   .runs_before = {"ip6-lookup", 0},
1225   .feature_index = &ip6_main.ip6_unicast_rx_feature_vpath,
1226 };
1227
1228 VNET_IP6_UNICAST_FEATURE_INIT (ip6_lookup, static) = {
1229   .node_name = "ip6-lookup",
1230   .runs_before = {0}, /* not before any other features */
1231   .feature_index = &ip6_main.ip6_unicast_rx_feature_lookup,
1232 };
1233
1234 /* Built-in ip6 multicast rx feature path definition (none now) */
1235 VNET_IP6_MULTICAST_FEATURE_INIT (ip4_vpath_mc, static) = {
1236   .node_name = "vpath-input-ip6",
1237   .runs_before = {"ip6-lookup", 0},
1238   .feature_index = &ip6_main.ip6_multicast_rx_feature_vpath,
1239 };
1240
1241 VNET_IP6_MULTICAST_FEATURE_INIT (ip6_lookup, static) = {
1242   .node_name = "ip6-lookup",
1243   .runs_before = {0}, /* not before any other features */
1244   .feature_index = &ip6_main.ip6_multicast_rx_feature_lookup,
1245 };
1246
1247 static char * feature_start_nodes[] =
1248   {"ip6-input"};
1249
1250 static clib_error_t *
1251 ip6_feature_init (vlib_main_t * vm, ip6_main_t * im)
1252 {
1253   ip_lookup_main_t * lm = &im->lookup_main;
1254   clib_error_t * error;
1255   vnet_cast_t cast;
1256
1257   for (cast = 0; cast < VNET_N_CAST; cast++)
1258     {
1259       ip_config_main_t * cm = &lm->rx_config_mains[cast];
1260       vnet_config_main_t * vcm = &cm->config_main;
1261
1262       if ((error = ip_feature_init_cast (vm, cm, vcm,
1263                                          feature_start_nodes,
1264                                          ARRAY_LEN(feature_start_nodes),
1265                                          cast,
1266                                          0 /* is_ip4 */)))
1267         return error;
1268     }
1269   return 0;
1270 }
1271
1272 clib_error_t *
1273 ip6_sw_interface_add_del (vnet_main_t * vnm,
1274                           u32 sw_if_index,
1275                           u32 is_add)
1276 {
1277   vlib_main_t * vm = vnm->vlib_main;
1278   ip6_main_t * im = &ip6_main;
1279   ip_lookup_main_t * lm = &im->lookup_main;
1280   u32 ci, cast;
1281   u32 feature_index;
1282
1283   for (cast = 0; cast < VNET_N_CAST; cast++)
1284     {
1285       ip_config_main_t * cm = &lm->rx_config_mains[cast];
1286       vnet_config_main_t * vcm = &cm->config_main;
1287
1288       vec_validate_init_empty (cm->config_index_by_sw_if_index, sw_if_index, ~0);
1289       ci = cm->config_index_by_sw_if_index[sw_if_index];
1290
1291       if (cast == VNET_UNICAST)
1292         feature_index = im->ip6_unicast_rx_feature_lookup;
1293       else
1294         feature_index = im->ip6_multicast_rx_feature_lookup;
1295
1296       if (is_add)
1297         ci = vnet_config_add_feature (vm, vcm,
1298                                       ci,
1299                                       feature_index,
1300                                       /* config data */ 0,
1301                                       /* # bytes of config data */ 0);
1302       else
1303         ci = vnet_config_del_feature (vm, vcm,
1304                                       ci,
1305                                       feature_index,
1306                                       /* config data */ 0,
1307                                       /* # bytes of config data */ 0);
1308
1309       cm->config_index_by_sw_if_index[sw_if_index] = ci;
1310     }
1311   return /* no error */ 0;
1312 }
1313
1314 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
1315
1316 static uword
1317 ip6_lookup (vlib_main_t * vm,
1318             vlib_node_runtime_t * node,
1319             vlib_frame_t * frame)
1320 {
1321   return ip6_lookup_inline (vm, node, frame, /* is_indirect */ 0);
1322 }
1323
1324 static u8 * format_ip6_lookup_trace (u8 * s, va_list * args);
1325
1326 VLIB_REGISTER_NODE (ip6_lookup_node) = {
1327   .function = ip6_lookup,
1328   .name = "ip6-lookup",
1329   .vector_size = sizeof (u32),
1330
1331   .format_trace = format_ip6_lookup_trace,
1332
1333   .n_next_nodes = IP6_LOOKUP_N_NEXT,
1334   .next_nodes = IP6_LOOKUP_NEXT_NODES,
1335 };
1336
1337 VLIB_NODE_FUNCTION_MULTIARCH (ip6_lookup_node, ip6_lookup)
1338
1339 static uword
1340 ip6_indirect (vlib_main_t * vm,
1341               vlib_node_runtime_t * node,
1342               vlib_frame_t * frame)
1343 {
1344   return ip6_lookup_inline (vm, node, frame, /* is_indirect */ 1);
1345 }
1346
1347
1348 VLIB_REGISTER_NODE (ip6_indirect_node) = {
1349   .function = ip6_indirect,
1350   .name = "ip6-indirect",
1351   .vector_size = sizeof (u32),
1352   .sibling_of = "ip6-lookup",
1353   .format_trace = format_ip6_lookup_trace,
1354   .n_next_nodes = 0,
1355 };
1356
1357 VLIB_NODE_FUNCTION_MULTIARCH (ip6_indirect_node, ip6_indirect)
1358
1359 typedef struct {
1360   /* Adjacency taken. */
1361   u32 adj_index;
1362   u32 flow_hash;
1363   u32 fib_index;
1364
1365   /* Packet data, possibly *after* rewrite. */
1366   u8 packet_data[128 - 1*sizeof(u32)];
1367 } ip6_forward_next_trace_t;
1368
1369 static u8 * format_ip6_forward_next_trace (u8 * s, va_list * args)
1370 {
1371   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1372   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1373   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
1374   uword indent = format_get_indent (s);
1375
1376   s = format(s, "%U%U",
1377              format_white_space, indent,
1378              format_ip6_header, t->packet_data);
1379   return s;
1380 }
1381
1382 static u8 * format_ip6_lookup_trace (u8 * s, va_list * args)
1383 {
1384   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1385   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1386   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
1387   vnet_main_t * vnm = vnet_get_main();
1388   ip6_main_t * im = &ip6_main;
1389   uword indent = format_get_indent (s);
1390
1391   s = format (s, "fib %d adj-idx %d : %U flow hash: 0x%08x",
1392               t->fib_index, t->adj_index, format_ip_adjacency,
1393               vnm, &im->lookup_main, t->adj_index, t->flow_hash);
1394   s = format(s, "\n%U%U",
1395              format_white_space, indent,
1396              format_ip6_header, t->packet_data);
1397   return s;
1398 }
1399
1400
1401 static u8 * format_ip6_rewrite_trace (u8 * s, va_list * args)
1402 {
1403   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1404   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1405   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
1406   vnet_main_t * vnm = vnet_get_main();
1407   ip6_main_t * im = &ip6_main;
1408   uword indent = format_get_indent (s);
1409
1410   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
1411               t->fib_index, t->adj_index, format_ip_adjacency,
1412               vnm, &im->lookup_main, t->adj_index, t->flow_hash);
1413   s = format (s, "\n%U%U",
1414               format_white_space, indent,
1415               format_ip_adjacency_packet_data,
1416               vnm, &im->lookup_main, t->adj_index,
1417               t->packet_data, sizeof (t->packet_data));
1418   return s;
1419 }
1420
1421 /* Common trace function for all ip6-forward next nodes. */
1422 void
1423 ip6_forward_next_trace (vlib_main_t * vm,
1424                         vlib_node_runtime_t * node,
1425                         vlib_frame_t * frame,
1426                         vlib_rx_or_tx_t which_adj_index)
1427 {
1428   u32 * from, n_left;
1429   ip6_main_t * im = &ip6_main;
1430
1431   n_left = frame->n_vectors;
1432   from = vlib_frame_vector_args (frame);
1433
1434   while (n_left >= 4)
1435     {
1436       u32 bi0, bi1;
1437       vlib_buffer_t * b0, * b1;
1438       ip6_forward_next_trace_t * t0, * t1;
1439
1440       /* Prefetch next iteration. */
1441       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1442       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1443
1444       bi0 = from[0];
1445       bi1 = from[1];
1446
1447       b0 = vlib_get_buffer (vm, bi0);
1448       b1 = vlib_get_buffer (vm, bi1);
1449
1450       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1451         {
1452           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1453           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1454           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1455           t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
1456               vnet_buffer(b0)->sw_if_index[VLIB_TX] :
1457               vec_elt (im->fib_index_by_sw_if_index,
1458                        vnet_buffer(b0)->sw_if_index[VLIB_RX]);
1459
1460           clib_memcpy (t0->packet_data,
1461                   vlib_buffer_get_current (b0),
1462                   sizeof (t0->packet_data));
1463         }
1464       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1465         {
1466           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1467           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1468           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1469           t1->fib_index = (vnet_buffer(b1)->sw_if_index[VLIB_TX] != (u32)~0) ?
1470               vnet_buffer(b1)->sw_if_index[VLIB_TX] :
1471               vec_elt (im->fib_index_by_sw_if_index,
1472                        vnet_buffer(b1)->sw_if_index[VLIB_RX]);
1473
1474           clib_memcpy (t1->packet_data,
1475                   vlib_buffer_get_current (b1),
1476                   sizeof (t1->packet_data));
1477         }
1478       from += 2;
1479       n_left -= 2;
1480     }
1481
1482   while (n_left >= 1)
1483     {
1484       u32 bi0;
1485       vlib_buffer_t * b0;
1486       ip6_forward_next_trace_t * t0;
1487
1488       bi0 = from[0];
1489
1490       b0 = vlib_get_buffer (vm, bi0);
1491
1492       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1493         {
1494           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1495           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1496           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1497           t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
1498               vnet_buffer(b0)->sw_if_index[VLIB_TX] :
1499               vec_elt (im->fib_index_by_sw_if_index,
1500                        vnet_buffer(b0)->sw_if_index[VLIB_RX]);
1501
1502           clib_memcpy (t0->packet_data,
1503                   vlib_buffer_get_current (b0),
1504                   sizeof (t0->packet_data));
1505         }
1506       from += 1;
1507       n_left -= 1;
1508     }
1509 }
1510
1511 static uword
1512 ip6_drop_or_punt (vlib_main_t * vm,
1513                   vlib_node_runtime_t * node,
1514                   vlib_frame_t * frame,
1515                   ip6_error_t error_code)
1516 {
1517   u32 * buffers = vlib_frame_vector_args (frame);
1518   uword n_packets = frame->n_vectors;
1519
1520   vlib_error_drop_buffers (vm, node,
1521                            buffers,
1522                            /* stride */ 1,
1523                            n_packets,
1524                            /* next */ 0,
1525                            ip6_input_node.index,
1526                            error_code);
1527
1528   if (node->flags & VLIB_NODE_FLAG_TRACE)
1529     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1530
1531   return n_packets;
1532 }
1533
1534 static uword
1535 ip6_drop (vlib_main_t * vm,
1536           vlib_node_runtime_t * node,
1537           vlib_frame_t * frame)
1538 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_DROP); }
1539
1540 static uword
1541 ip6_punt (vlib_main_t * vm,
1542           vlib_node_runtime_t * node,
1543           vlib_frame_t * frame)
1544 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_PUNT); }
1545
1546 static uword
1547 ip6_miss (vlib_main_t * vm,
1548           vlib_node_runtime_t * node,
1549           vlib_frame_t * frame)
1550 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_DST_LOOKUP_MISS); }
1551
1552 VLIB_REGISTER_NODE (ip6_drop_node,static) = {
1553   .function = ip6_drop,
1554   .name = "ip6-drop",
1555   .vector_size = sizeof (u32),
1556
1557   .format_trace = format_ip6_forward_next_trace,
1558
1559   .n_next_nodes = 1,
1560   .next_nodes = {
1561     [0] = "error-drop",
1562   },
1563 };
1564
1565 VLIB_NODE_FUNCTION_MULTIARCH (ip6_drop_node, ip6_drop)
1566
1567 VLIB_REGISTER_NODE (ip6_punt_node,static) = {
1568   .function = ip6_punt,
1569   .name = "ip6-punt",
1570   .vector_size = sizeof (u32),
1571
1572   .format_trace = format_ip6_forward_next_trace,
1573
1574   .n_next_nodes = 1,
1575   .next_nodes = {
1576     [0] = "error-punt",
1577   },
1578 };
1579
1580 VLIB_NODE_FUNCTION_MULTIARCH (ip6_punt_node, ip6_punt)
1581
1582 VLIB_REGISTER_NODE (ip6_miss_node,static) = {
1583   .function = ip6_miss,
1584   .name = "ip6-miss",
1585   .vector_size = sizeof (u32),
1586
1587   .format_trace = format_ip6_forward_next_trace,
1588
1589   .n_next_nodes = 1,
1590   .next_nodes = {
1591     [0] = "error-drop",
1592   },
1593 };
1594
1595 VLIB_NODE_FUNCTION_MULTIARCH (ip6_miss_node, ip6_miss)
1596
1597 VLIB_REGISTER_NODE (ip6_multicast_node,static) = {
1598   .function = ip6_drop,
1599   .name = "ip6-multicast",
1600   .vector_size = sizeof (u32),
1601
1602   .format_trace = format_ip6_forward_next_trace,
1603
1604   .n_next_nodes = 1,
1605   .next_nodes = {
1606     [0] = "error-drop",
1607   },
1608 };
1609
1610 /* Compute TCP/UDP/ICMP6 checksum in software. */
1611 u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp)
1612 {
1613   ip_csum_t sum0;
1614   u16 sum16, payload_length_host_byte_order;
1615   u32 i, n_this_buffer, n_bytes_left;
1616   u32 headers_size = sizeof(ip0[0]);
1617   void * data_this_buffer;
1618
1619   ASSERT(bogus_lengthp);
1620   *bogus_lengthp = 0;
1621
1622   /* Initialize checksum with ip header. */
1623   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
1624   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1625   data_this_buffer = (void *) (ip0 + 1);
1626
1627   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1628     {
1629       sum0 = ip_csum_with_carry (sum0,
1630                                  clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1631       sum0 = ip_csum_with_carry (sum0,
1632                                  clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1633     }
1634
1635   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1636   if (PREDICT_FALSE (ip0->protocol ==  IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1637     {
1638       u32  skip_bytes;
1639       ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t  *)data_this_buffer;
1640
1641       /* validate really icmp6 next */
1642       ASSERT(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6);
1643
1644       skip_bytes = 8* (1 + ext_hdr->n_data_u64s);
1645       data_this_buffer  = (void *)((u8 *)data_this_buffer + skip_bytes);
1646
1647       payload_length_host_byte_order  -= skip_bytes;
1648       headers_size += skip_bytes;
1649    }
1650
1651   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1652 #if DPDK > 0
1653   if (p0 && n_this_buffer + headers_size  > p0->current_length)
1654   {
1655     struct rte_mbuf *mb = rte_mbuf_from_vlib_buffer(p0);
1656     u8 nb_segs = mb->nb_segs;
1657
1658     n_this_buffer = (p0->current_length > headers_size ?
1659                      p0->current_length - headers_size : 0);
1660     while (n_bytes_left)
1661       {
1662         sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1663         n_bytes_left -= n_this_buffer;
1664
1665         mb = mb->next;
1666         nb_segs--;
1667         if ((nb_segs == 0) || (mb == 0))
1668           break;
1669
1670         data_this_buffer = rte_ctrlmbuf_data(mb);
1671         n_this_buffer = mb->data_len;
1672       }
1673     if (n_bytes_left || nb_segs)
1674       {
1675         *bogus_lengthp = 1;
1676         return 0xfefe;
1677       }
1678   }
1679   else sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1680 #else
1681   if (p0 && n_this_buffer + headers_size  > p0->current_length)
1682     n_this_buffer = p0->current_length > headers_size  ? p0->current_length - headers_size  : 0;
1683   while (1)
1684     {
1685       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1686       n_bytes_left -= n_this_buffer;
1687       if (n_bytes_left == 0)
1688         break;
1689
1690       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
1691         {
1692           *bogus_lengthp = 1;
1693           return 0xfefe;
1694         }
1695       p0 = vlib_get_buffer (vm, p0->next_buffer);
1696       data_this_buffer = vlib_buffer_get_current (p0);
1697       n_this_buffer = p0->current_length;
1698     }
1699 #endif /* DPDK */
1700
1701   sum16 = ~ ip_csum_fold (sum0);
1702
1703   return sum16;
1704 }
1705
1706 u32 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1707 {
1708   ip6_header_t * ip0 = vlib_buffer_get_current (p0);
1709   udp_header_t * udp0;
1710   u16 sum16;
1711   int bogus_length;
1712
1713   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1714   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1715           || ip0->protocol == IP_PROTOCOL_ICMP6
1716           || ip0->protocol == IP_PROTOCOL_UDP
1717           || ip0->protocol ==  IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1718
1719   udp0 = (void *) (ip0 + 1);
1720   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1721     {
1722       p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1723                     | IP_BUFFER_L4_CHECKSUM_CORRECT);
1724       return p0->flags;
1725     }
1726
1727   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1728
1729   p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1730                 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1731
1732   return p0->flags;
1733 }
1734
1735 static uword
1736 ip6_local (vlib_main_t * vm,
1737            vlib_node_runtime_t * node,
1738            vlib_frame_t * frame)
1739 {
1740   ip6_main_t * im = &ip6_main;
1741   ip_lookup_main_t * lm = &im->lookup_main;
1742   ip_local_next_t next_index;
1743   u32 * from, * to_next, n_left_from, n_left_to_next;
1744   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
1745
1746   from = vlib_frame_vector_args (frame);
1747   n_left_from = frame->n_vectors;
1748   next_index = node->cached_next_index;
1749
1750   if (node->flags & VLIB_NODE_FLAG_TRACE)
1751     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1752
1753   while (n_left_from > 0)
1754     {
1755       vlib_get_next_frame (vm, node, next_index,
1756                            to_next, n_left_to_next);
1757
1758       while (n_left_from >= 4 && n_left_to_next >= 2)
1759         {
1760           vlib_buffer_t * p0, * p1;
1761           ip6_header_t * ip0, * ip1;
1762           udp_header_t * udp0, * udp1;
1763           u32 pi0, ip_len0, udp_len0, flags0, next0;
1764           u32 pi1, ip_len1, udp_len1, flags1, next1;
1765           i32 len_diff0, len_diff1;
1766           u8 error0, type0, good_l4_checksum0;
1767           u8 error1, type1, good_l4_checksum1;
1768
1769           pi0 = to_next[0] = from[0];
1770           pi1 = to_next[1] = from[1];
1771           from += 2;
1772           n_left_from -= 2;
1773           to_next += 2;
1774           n_left_to_next -= 2;
1775
1776           p0 = vlib_get_buffer (vm, pi0);
1777           p1 = vlib_get_buffer (vm, pi1);
1778
1779           ip0 = vlib_buffer_get_current (p0);
1780           ip1 = vlib_buffer_get_current (p1);
1781
1782           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1783           type1 = lm->builtin_protocol_by_ip_protocol[ip1->protocol];
1784
1785           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1786           next1 = lm->local_next_by_ip_protocol[ip1->protocol];
1787
1788           flags0 = p0->flags;
1789           flags1 = p1->flags;
1790
1791           good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1792           good_l4_checksum1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1793
1794           udp0 = ip6_next_header (ip0);
1795           udp1 = ip6_next_header (ip1);
1796
1797           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1798           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0;
1799           good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UDP && udp1->checksum == 0;
1800
1801           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1802           good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1803
1804           /* Verify UDP length. */
1805           ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1806           ip_len1 = clib_net_to_host_u16 (ip1->payload_length);
1807           udp_len0 = clib_net_to_host_u16 (udp0->length);
1808           udp_len1 = clib_net_to_host_u16 (udp1->length);
1809
1810           len_diff0 = ip_len0 - udp_len0;
1811           len_diff1 = ip_len1 - udp_len1;
1812
1813           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1814           len_diff1 = type1 == IP_BUILTIN_PROTOCOL_UDP ? len_diff1 : 0;
1815
1816           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1817                              && ! good_l4_checksum0
1818                              && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1819             {
1820               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1821               good_l4_checksum0 =
1822                 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1823             }
1824           if (PREDICT_FALSE (type1 != IP_BUILTIN_PROTOCOL_UNKNOWN
1825                              && ! good_l4_checksum1
1826                              && ! (flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1827             {
1828               flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, p1);
1829               good_l4_checksum1 =
1830                 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1831             }
1832
1833           error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
1834
1835           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1836           error1 = len_diff1 < 0 ? IP6_ERROR_UDP_LENGTH : error1;
1837
1838           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM);
1839           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM);
1840           error0 = (! good_l4_checksum0
1841                     ? IP6_ERROR_UDP_CHECKSUM + type0
1842                     : error0);
1843           error1 = (! good_l4_checksum1
1844                     ? IP6_ERROR_UDP_CHECKSUM + type1
1845                     : error1);
1846
1847           /* Drop packets from unroutable hosts. */
1848           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1849           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL && type0 != IP_BUILTIN_PROTOCOL_ICMP)
1850             {
1851               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1852               error0 = (lm->miss_adj_index == src_adj_index0
1853                         ? IP6_ERROR_SRC_LOOKUP_MISS
1854                         : error0);
1855             }
1856           if (error1 == IP6_ERROR_UNKNOWN_PROTOCOL && type1 != IP_BUILTIN_PROTOCOL_ICMP)
1857             {
1858               u32 src_adj_index1 = ip6_src_lookup_for_packet (im, p1, ip1);
1859               error1 = (lm->miss_adj_index == src_adj_index1
1860                         ? IP6_ERROR_SRC_LOOKUP_MISS
1861                         : error1);
1862             }
1863
1864           next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1865           next1 = error1 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1866
1867           p0->error = error_node->errors[error0];
1868           p1->error = error_node->errors[error1];
1869
1870           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1871                                            to_next, n_left_to_next,
1872                                            pi0, pi1, next0, next1);
1873         }
1874
1875       while (n_left_from > 0 && n_left_to_next > 0)
1876         {
1877           vlib_buffer_t * p0;
1878           ip6_header_t * ip0;
1879           udp_header_t * udp0;
1880           u32 pi0, ip_len0, udp_len0, flags0, next0;
1881           i32 len_diff0;
1882           u8 error0, type0, good_l4_checksum0;
1883
1884           pi0 = to_next[0] = from[0];
1885           from += 1;
1886           n_left_from -= 1;
1887           to_next += 1;
1888           n_left_to_next -= 1;
1889
1890           p0 = vlib_get_buffer (vm, pi0);
1891
1892           ip0 = vlib_buffer_get_current (p0);
1893
1894           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1895           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1896
1897           flags0 = p0->flags;
1898
1899           good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1900
1901           udp0 = ip6_next_header (ip0);
1902
1903           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1904           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0;
1905
1906           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1907
1908           /* Verify UDP length. */
1909           ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1910           udp_len0 = clib_net_to_host_u16 (udp0->length);
1911
1912           len_diff0 = ip_len0 - udp_len0;
1913
1914           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1915
1916           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1917                              && ! good_l4_checksum0
1918                              && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1919             {
1920               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1921               good_l4_checksum0 =
1922                 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1923             }
1924
1925           error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
1926
1927           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1928
1929           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM);
1930           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM);
1931           error0 = (! good_l4_checksum0
1932                     ? IP6_ERROR_UDP_CHECKSUM + type0
1933                     : error0);
1934
1935           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1936           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL && type0 != IP_BUILTIN_PROTOCOL_ICMP)
1937             {
1938               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1939               error0 = (lm->miss_adj_index == src_adj_index0
1940                         ? IP6_ERROR_SRC_LOOKUP_MISS
1941                         : error0);
1942             }
1943
1944           next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1945
1946           p0->error = error_node->errors[error0];
1947
1948           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1949                                            to_next, n_left_to_next,
1950                                            pi0, next0);
1951         }
1952
1953       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1954     }
1955
1956   return frame->n_vectors;
1957 }
1958
1959 VLIB_REGISTER_NODE (ip6_local_node,static) = {
1960   .function = ip6_local,
1961   .name = "ip6-local",
1962   .vector_size = sizeof (u32),
1963
1964   .format_trace = format_ip6_forward_next_trace,
1965
1966   .n_next_nodes = IP_LOCAL_N_NEXT,
1967   .next_nodes = {
1968     [IP_LOCAL_NEXT_DROP] = "error-drop",
1969     [IP_LOCAL_NEXT_PUNT] = "error-punt",
1970     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1971     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1972   },
1973 };
1974
1975 VLIB_NODE_FUNCTION_MULTIARCH (ip6_local_node, ip6_local)
1976
1977 void ip6_register_protocol (u32 protocol, u32 node_index)
1978 {
1979   vlib_main_t * vm = vlib_get_main();
1980   ip6_main_t * im = &ip6_main;
1981   ip_lookup_main_t * lm = &im->lookup_main;
1982
1983   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1984   lm->local_next_by_ip_protocol[protocol] = vlib_node_add_next (vm, ip6_local_node.index, node_index);
1985 }
1986
1987 typedef enum {
1988   IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1989   IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
1990   IP6_DISCOVER_NEIGHBOR_N_NEXT,
1991 } ip6_discover_neighbor_next_t;
1992
1993 typedef enum {
1994   IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
1995   IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
1996 } ip6_discover_neighbor_error_t;
1997
1998 static uword
1999 ip6_discover_neighbor (vlib_main_t * vm,
2000                        vlib_node_runtime_t * node,
2001                        vlib_frame_t * frame)
2002 {
2003   vnet_main_t * vnm = vnet_get_main();
2004   ip6_main_t * im = &ip6_main;
2005   ip_lookup_main_t * lm = &im->lookup_main;
2006   u32 * from, * to_next_drop;
2007   uword n_left_from, n_left_to_next_drop;
2008   static f64 time_last_seed_change = -1e100;
2009   static u32 hash_seeds[3];
2010   static uword hash_bitmap[256 / BITS (uword)];
2011   f64 time_now;
2012   int bogus_length;
2013
2014   if (node->flags & VLIB_NODE_FLAG_TRACE)
2015     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
2016
2017   time_now = vlib_time_now (vm);
2018   if (time_now - time_last_seed_change > 1e-3)
2019     {
2020       uword i;
2021       u32 * r = clib_random_buffer_get_data (&vm->random_buffer,
2022                                              sizeof (hash_seeds));
2023       for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
2024         hash_seeds[i] = r[i];
2025
2026       /* Mark all hash keys as been not-seen before. */
2027       for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
2028         hash_bitmap[i] = 0;
2029
2030       time_last_seed_change = time_now;
2031     }
2032
2033   from = vlib_frame_vector_args (frame);
2034   n_left_from = frame->n_vectors;
2035
2036   while (n_left_from > 0)
2037     {
2038       vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
2039                            to_next_drop, n_left_to_next_drop);
2040
2041       while (n_left_from > 0 && n_left_to_next_drop > 0)
2042         {
2043           vlib_buffer_t * p0;
2044           ip6_header_t * ip0;
2045           u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
2046           uword bm0;
2047           ip_adjacency_t * adj0;
2048           vnet_hw_interface_t * hw_if0;
2049           u32 next0;
2050
2051           pi0 = from[0];
2052
2053           p0 = vlib_get_buffer (vm, pi0);
2054
2055           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
2056
2057           ip0 = vlib_buffer_get_current (p0);
2058
2059           adj0 = ip_get_adjacency (lm, adj_index0);
2060
2061           if (adj0->arp.next_hop.ip6.as_u64[0] ||
2062               adj0->arp.next_hop.ip6.as_u64[1]) {
2063             ip0->dst_address.as_u64[0] = adj0->arp.next_hop.ip6.as_u64[0];
2064             ip0->dst_address.as_u64[1] = adj0->arp.next_hop.ip6.as_u64[1];
2065           }
2066
2067           a0 = hash_seeds[0];
2068           b0 = hash_seeds[1];
2069           c0 = hash_seeds[2];
2070
2071           sw_if_index0 = adj0->rewrite_header.sw_if_index;
2072           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2073
2074           a0 ^= sw_if_index0;
2075           b0 ^= ip0->dst_address.as_u32[0];
2076           c0 ^= ip0->dst_address.as_u32[1];
2077
2078           hash_v3_mix32 (a0, b0, c0);
2079
2080           b0 ^= ip0->dst_address.as_u32[2];
2081           c0 ^= ip0->dst_address.as_u32[3];
2082
2083           hash_v3_finalize32 (a0, b0, c0);
2084
2085           c0 &= BITS (hash_bitmap) - 1;
2086           c0 = c0 / BITS (uword);
2087           m0 = (uword) 1 << (c0 % BITS (uword));
2088
2089           bm0 = hash_bitmap[c0];
2090           drop0 = (bm0 & m0) != 0;
2091
2092           /* Mark it as seen. */
2093           hash_bitmap[c0] = bm0 | m0;
2094
2095           from += 1;
2096           n_left_from -= 1;
2097           to_next_drop[0] = pi0;
2098           to_next_drop += 1;
2099           n_left_to_next_drop -= 1;
2100
2101           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2102
2103           /* If the interface is link-down, drop the pkt */
2104           if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
2105             drop0 = 1;
2106
2107           p0->error =
2108             node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
2109                          : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
2110           if (drop0)
2111             continue;
2112
2113           {
2114             u32 bi0 = 0;
2115             icmp6_neighbor_solicitation_header_t * h0;
2116             vlib_buffer_t * b0;
2117
2118             h0 = vlib_packet_template_get_packet
2119               (vm, &im->discover_neighbor_packet_template, &bi0);
2120
2121             /*
2122              * Build ethernet header.
2123              * Choose source address based on destination lookup
2124              * adjacency.
2125              */
2126             ip6_src_address_for_packet (im, p0, &h0->ip.src_address,
2127                                         sw_if_index0);
2128
2129             /*
2130              * Destination address is a solicited node multicast address.
2131              * We need to fill in
2132              * the low 24 bits with low 24 bits of target's address.
2133              */
2134             h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
2135             h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
2136             h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
2137
2138             h0->neighbor.target_address = ip0->dst_address;
2139
2140             clib_memcpy (h0->link_layer_option.ethernet_address,
2141                     hw_if0->hw_address, vec_len (hw_if0->hw_address));
2142
2143             /* $$$$ appears we need this; why is the checksum non-zero? */
2144             h0->neighbor.icmp.checksum = 0;
2145             h0->neighbor.icmp.checksum =
2146               ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
2147                                                  &bogus_length);
2148
2149             ASSERT (bogus_length == 0);
2150
2151             vlib_buffer_copy_trace_flag (vm, p0, bi0);
2152             b0 = vlib_get_buffer (vm, bi0);
2153             vnet_buffer (b0)->sw_if_index[VLIB_TX]
2154               = vnet_buffer (p0)->sw_if_index[VLIB_TX];
2155
2156             /* Add rewrite/encap string. */
2157             vnet_rewrite_one_header (adj0[0], h0,
2158                                      sizeof (ethernet_header_t));
2159             vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2160
2161             next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
2162
2163             vlib_set_next_frame_buffer (vm, node, next0, bi0);
2164           }
2165         }
2166
2167       vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
2168                            n_left_to_next_drop);
2169     }
2170
2171   return frame->n_vectors;
2172 }
2173
2174 static char * ip6_discover_neighbor_error_strings[] = {
2175   [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
2176   [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT]
2177   = "neighbor solicitations sent",
2178 };
2179
2180 VLIB_REGISTER_NODE (ip6_discover_neighbor_node) = {
2181   .function = ip6_discover_neighbor,
2182   .name = "ip6-discover-neighbor",
2183   .vector_size = sizeof (u32),
2184
2185   .format_trace = format_ip6_forward_next_trace,
2186
2187   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
2188   .error_strings = ip6_discover_neighbor_error_strings,
2189
2190   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
2191   .next_nodes = {
2192     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop",
2193     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output",
2194   },
2195 };
2196
2197 clib_error_t *
2198 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index)
2199 {
2200   vnet_main_t * vnm = vnet_get_main();
2201   ip6_main_t * im = &ip6_main;
2202   icmp6_neighbor_solicitation_header_t * h;
2203   ip6_address_t * src;
2204   ip_interface_address_t * ia;
2205   ip_adjacency_t * adj;
2206   vnet_hw_interface_t * hi;
2207   vnet_sw_interface_t * si;
2208   vlib_buffer_t * b;
2209   u32 bi = 0;
2210   int bogus_length;
2211
2212   si = vnet_get_sw_interface (vnm, sw_if_index);
2213
2214   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2215     {
2216       return clib_error_return (0, "%U: interface %U down",
2217                                 format_ip6_address, dst,
2218                                 format_vnet_sw_if_index_name, vnm,
2219                                 sw_if_index);
2220     }
2221
2222   src = ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2223   if (! src)
2224     {
2225       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2226       return clib_error_return
2227         (0, "no matching interface address for destination %U (interface %U)",
2228          format_ip6_address, dst,
2229          format_vnet_sw_if_index_name, vnm, sw_if_index);
2230     }
2231
2232   h = vlib_packet_template_get_packet (vm, &im->discover_neighbor_packet_template, &bi);
2233
2234   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2235
2236   /* Destination address is a solicited node multicast address.  We need to fill in
2237      the low 24 bits with low 24 bits of target's address. */
2238   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
2239   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
2240   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
2241
2242   h->ip.src_address = src[0];
2243   h->neighbor.target_address = dst[0];
2244
2245   clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address, vec_len (hi->hw_address));
2246
2247   h->neighbor.icmp.checksum =
2248     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
2249   ASSERT(bogus_length == 0);
2250
2251   b = vlib_get_buffer (vm, bi);
2252   vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2253
2254   /* Add encapsulation string for software interface (e.g. ethernet header). */
2255   adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
2256   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2257   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2258
2259   {
2260     vlib_frame_t * f = vlib_get_frame_to_node (vm, hi->output_node_index);
2261     u32 * to_next = vlib_frame_vector_args (f);
2262     to_next[0] = bi;
2263     f->n_vectors = 1;
2264     vlib_put_frame_to_node (vm, hi->output_node_index, f);
2265   }
2266
2267   return /* no error */ 0;
2268 }
2269
2270 typedef enum {
2271   IP6_REWRITE_NEXT_DROP,
2272 } ip6_rewrite_next_t;
2273
2274 always_inline uword
2275 ip6_rewrite_inline (vlib_main_t * vm,
2276                     vlib_node_runtime_t * node,
2277                     vlib_frame_t * frame,
2278                     int rewrite_for_locally_received_packets)
2279 {
2280   ip_lookup_main_t * lm = &ip6_main.lookup_main;
2281   u32 * from = vlib_frame_vector_args (frame);
2282   u32 n_left_from, n_left_to_next, * to_next, next_index;
2283   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
2284   vlib_rx_or_tx_t adj_rx_tx = rewrite_for_locally_received_packets ? VLIB_RX : VLIB_TX;
2285
2286   n_left_from = frame->n_vectors;
2287   next_index = node->cached_next_index;
2288   u32 cpu_index = os_get_cpu_number();
2289
2290   while (n_left_from > 0)
2291     {
2292       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2293
2294       while (n_left_from >= 4 && n_left_to_next >= 2)
2295         {
2296           ip_adjacency_t * adj0, * adj1;
2297           vlib_buffer_t * p0, * p1;
2298           ip6_header_t * ip0, * ip1;
2299           u32 pi0, rw_len0, next0, error0, adj_index0;
2300           u32 pi1, rw_len1, next1, error1, adj_index1;
2301
2302           /* Prefetch next iteration. */
2303           {
2304             vlib_buffer_t * p2, * p3;
2305
2306             p2 = vlib_get_buffer (vm, from[2]);
2307             p3 = vlib_get_buffer (vm, from[3]);
2308
2309             vlib_prefetch_buffer_header (p2, LOAD);
2310             vlib_prefetch_buffer_header (p3, LOAD);
2311
2312             CLIB_PREFETCH (p2->pre_data, 32, STORE);
2313             CLIB_PREFETCH (p3->pre_data, 32, STORE);
2314
2315             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2316             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2317           }
2318
2319           pi0 = to_next[0] = from[0];
2320           pi1 = to_next[1] = from[1];
2321
2322           from += 2;
2323           n_left_from -= 2;
2324           to_next += 2;
2325           n_left_to_next -= 2;
2326
2327           p0 = vlib_get_buffer (vm, pi0);
2328           p1 = vlib_get_buffer (vm, pi1);
2329
2330           adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
2331           adj_index1 = vnet_buffer (p1)->ip.adj_index[adj_rx_tx];
2332
2333           /* We should never rewrite a pkt using the MISS adjacency */
2334           ASSERT(adj_index0 && adj_index1);
2335
2336           ip0 = vlib_buffer_get_current (p0);
2337           ip1 = vlib_buffer_get_current (p1);
2338
2339           error0 = error1 = IP6_ERROR_NONE;
2340
2341           if (! rewrite_for_locally_received_packets)
2342             {
2343               i32 hop_limit0 = ip0->hop_limit, hop_limit1 = ip1->hop_limit;
2344
2345               /* Input node should have reject packets with hop limit 0. */
2346               ASSERT (ip0->hop_limit > 0);
2347               ASSERT (ip1->hop_limit > 0);
2348
2349               hop_limit0 -= 1;
2350               hop_limit1 -= 1;
2351
2352               ip0->hop_limit = hop_limit0;
2353               ip1->hop_limit = hop_limit1;
2354
2355               error0 = hop_limit0 <= 0 ? IP6_ERROR_TIME_EXPIRED : error0;
2356               error1 = hop_limit1 <= 0 ? IP6_ERROR_TIME_EXPIRED : error1;
2357             }
2358
2359           adj0 = ip_get_adjacency (lm, adj_index0);
2360           adj1 = ip_get_adjacency (lm, adj_index1);
2361
2362           if (rewrite_for_locally_received_packets)
2363             {
2364               /*
2365                * If someone sends e.g. an icmp6 w/ src = dst = interface addr,
2366                * we end up here with a local adjacency in hand
2367                */
2368               if (PREDICT_FALSE(adj0->lookup_next_index
2369                                 == IP_LOOKUP_NEXT_LOCAL))
2370                 error0 = IP6_ERROR_SPOOFED_LOCAL_PACKETS;
2371               if (PREDICT_FALSE(adj1->lookup_next_index
2372                                 == IP_LOOKUP_NEXT_LOCAL))
2373                 error1 = IP6_ERROR_SPOOFED_LOCAL_PACKETS;
2374             }
2375
2376           rw_len0 = adj0[0].rewrite_header.data_bytes;
2377           rw_len1 = adj1[0].rewrite_header.data_bytes;
2378
2379           vlib_increment_combined_counter (&lm->adjacency_counters,
2380                                            cpu_index,
2381                                            adj_index0,
2382                                            /* packet increment */ 0,
2383                                            /* byte increment */ rw_len0);
2384           vlib_increment_combined_counter (&lm->adjacency_counters,
2385                                            cpu_index,
2386                                            adj_index1,
2387                                            /* packet increment */ 0,
2388                                            /* byte increment */ rw_len1);
2389
2390           /* Check MTU of outgoing interface. */
2391           error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
2392                     ? IP6_ERROR_MTU_EXCEEDED
2393                     : error0);
2394           error1 = (vlib_buffer_length_in_chain (vm, p1) > adj1[0].rewrite_header.max_l3_packet_bytes
2395                     ? IP6_ERROR_MTU_EXCEEDED
2396                     : error1);
2397
2398           p0->current_data -= rw_len0;
2399           p1->current_data -= rw_len1;
2400
2401           p0->current_length += rw_len0;
2402           p1->current_length += rw_len1;
2403
2404           vnet_buffer (p0)->sw_if_index[VLIB_TX] = adj0[0].rewrite_header.sw_if_index;
2405           vnet_buffer (p1)->sw_if_index[VLIB_TX] = adj1[0].rewrite_header.sw_if_index;
2406
2407           next0 = (error0 == IP6_ERROR_NONE) ?
2408             adj0[0].rewrite_header.next_index : IP6_REWRITE_NEXT_DROP;
2409           next1 = (error1 == IP6_ERROR_NONE) ?
2410             adj1[0].rewrite_header.next_index : IP6_REWRITE_NEXT_DROP;
2411
2412           /* Guess we are only writing on simple Ethernet header. */
2413           vnet_rewrite_two_headers (adj0[0], adj1[0],
2414                                     ip0, ip1,
2415                                     sizeof (ethernet_header_t));
2416
2417           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2418                                            to_next, n_left_to_next,
2419                                            pi0, pi1, next0, next1);
2420         }
2421
2422       while (n_left_from > 0 && n_left_to_next > 0)
2423         {
2424           ip_adjacency_t * adj0;
2425           vlib_buffer_t * p0;
2426           ip6_header_t * ip0;
2427           u32 pi0, rw_len0;
2428           u32 adj_index0, next0, error0;
2429
2430           pi0 = to_next[0] = from[0];
2431
2432           p0 = vlib_get_buffer (vm, pi0);
2433
2434           adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
2435
2436           /* We should never rewrite a pkt using the MISS adjacency */
2437           ASSERT(adj_index0);
2438
2439           adj0 = ip_get_adjacency (lm, adj_index0);
2440
2441           ip0 = vlib_buffer_get_current (p0);
2442
2443           error0 = IP6_ERROR_NONE;
2444
2445           /* Check hop limit */
2446           if (! rewrite_for_locally_received_packets)
2447             {
2448               i32 hop_limit0 = ip0->hop_limit;
2449
2450               ASSERT (ip0->hop_limit > 0);
2451
2452               hop_limit0 -= 1;
2453
2454               ip0->hop_limit = hop_limit0;
2455
2456               error0 = hop_limit0 <= 0 ? IP6_ERROR_TIME_EXPIRED : error0;
2457             }
2458
2459           if (rewrite_for_locally_received_packets)
2460             {
2461               if (PREDICT_FALSE(adj0->lookup_next_index
2462                                 == IP_LOOKUP_NEXT_LOCAL))
2463                 error0 = IP6_ERROR_SPOOFED_LOCAL_PACKETS;
2464             }
2465
2466           /* Guess we are only writing on simple Ethernet header. */
2467           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2468
2469           /* Update packet buffer attributes/set output interface. */
2470           rw_len0 = adj0[0].rewrite_header.data_bytes;
2471
2472           vlib_increment_combined_counter (&lm->adjacency_counters,
2473                                            cpu_index,
2474                                            adj_index0,
2475                                            /* packet increment */ 0,
2476                                            /* byte increment */ rw_len0);
2477
2478           /* Check MTU of outgoing interface. */
2479           error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
2480                     ? IP6_ERROR_MTU_EXCEEDED
2481                     : error0);
2482
2483           p0->current_data -= rw_len0;
2484           p0->current_length += rw_len0;
2485           vnet_buffer (p0)->sw_if_index[VLIB_TX] = adj0[0].rewrite_header.sw_if_index;
2486
2487           next0 = (error0 == IP6_ERROR_NONE) ?
2488             adj0[0].rewrite_header.next_index : IP6_REWRITE_NEXT_DROP;
2489
2490           p0->error = error_node->errors[error0];
2491
2492           from += 1;
2493           n_left_from -= 1;
2494           to_next += 1;
2495           n_left_to_next -= 1;
2496
2497           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2498                                            to_next, n_left_to_next,
2499                                            pi0, next0);
2500         }
2501
2502       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2503     }
2504
2505   /* Need to do trace after rewrites to pick up new packet data. */
2506   if (node->flags & VLIB_NODE_FLAG_TRACE)
2507     ip6_forward_next_trace (vm, node, frame, adj_rx_tx);
2508
2509   return frame->n_vectors;
2510 }
2511
2512 static uword
2513 ip6_rewrite_transit (vlib_main_t * vm,
2514                      vlib_node_runtime_t * node,
2515                      vlib_frame_t * frame)
2516 {
2517   return ip6_rewrite_inline (vm, node, frame,
2518                              /* rewrite_for_locally_received_packets */ 0);
2519 }
2520
2521 static uword
2522 ip6_rewrite_local (vlib_main_t * vm,
2523                    vlib_node_runtime_t * node,
2524                    vlib_frame_t * frame)
2525 {
2526   return ip6_rewrite_inline (vm, node, frame,
2527                              /* rewrite_for_locally_received_packets */ 1);
2528 }
2529
2530 VLIB_REGISTER_NODE (ip6_rewrite_node) = {
2531   .function = ip6_rewrite_transit,
2532   .name = "ip6-rewrite",
2533   .vector_size = sizeof (u32),
2534
2535   .format_trace = format_ip6_rewrite_trace,
2536
2537   .n_next_nodes = 1,
2538   .next_nodes = {
2539     [IP6_REWRITE_NEXT_DROP] = "error-drop",
2540   },
2541 };
2542
2543 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_node, ip6_rewrite_transit)
2544
2545 VLIB_REGISTER_NODE (ip6_rewrite_local_node) = {
2546   .function = ip6_rewrite_local,
2547   .name = "ip6-rewrite-local",
2548   .vector_size = sizeof (u32),
2549
2550   .sibling_of = "ip6-rewrite",
2551
2552   .format_trace = format_ip6_rewrite_trace,
2553
2554   .n_next_nodes = 0,
2555 };
2556
2557 VLIB_NODE_FUNCTION_MULTIARCH (ip6_rewrite_local_node, ip6_rewrite_local)
2558
2559 /*
2560  * Hop-by-Hop handling
2561  */
2562
2563 ip6_hop_by_hop_main_t ip6_hop_by_hop_main;
2564
2565 #define foreach_ip6_hop_by_hop_error \
2566 _(PROCESSED, "pkts with ip6 hop-by-hop options") \
2567 _(FORMAT, "incorrectly formatted hop-by-hop options") \
2568 _(UNKNOWN_OPTION, "unknown ip6 hop-by-hop options")
2569
2570 typedef enum {
2571 #define _(sym,str) IP6_HOP_BY_HOP_ERROR_##sym,
2572   foreach_ip6_hop_by_hop_error
2573 #undef _
2574   IP6_HOP_BY_HOP_N_ERROR,
2575 } ip6_hop_by_hop_error_t;
2576
2577 /*
2578  * Primary h-b-h handler trace support
2579  * We work pretty hard on the problem for obvious reasons
2580  */
2581 typedef struct {
2582   u32 next_index;
2583   u32 trace_len;
2584   u8 option_data[256];
2585 } ip6_hop_by_hop_trace_t;
2586
2587 vlib_node_registration_t ip6_hop_by_hop_node;
2588
2589 static char * ip6_hop_by_hop_error_strings[] = {
2590 #define _(sym,string) string,
2591   foreach_ip6_hop_by_hop_error
2592 #undef _
2593 };
2594
2595 static u8 *
2596 format_ip6_hop_by_hop_trace (u8 * s, va_list * args)
2597 {
2598   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
2599   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
2600   ip6_hop_by_hop_trace_t * t = va_arg (*args, ip6_hop_by_hop_trace_t *);
2601   ip6_hop_by_hop_header_t *hbh0;
2602   ip6_hop_by_hop_option_t *opt0, *limit0;
2603   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2604
2605   u8 type0;
2606
2607   hbh0 = (ip6_hop_by_hop_header_t *)t->option_data;
2608
2609   s = format (s, "IP6_HOP_BY_HOP: next index %d len %d traced %d",
2610               t->next_index, (hbh0->length+1)<<3, t->trace_len);
2611
2612   opt0 = (ip6_hop_by_hop_option_t *) (hbh0+1);
2613   limit0 = (ip6_hop_by_hop_option_t *) ((u8 *)hbh0) + t->trace_len;
2614
2615   while (opt0 < limit0) {
2616     type0 = opt0->type;
2617     switch (type0) {
2618     case 0: /* Pad, just stop */
2619       opt0 = (ip6_hop_by_hop_option_t *) ((u8 *)opt0) + 1;
2620       break;
2621
2622     default:
2623       if (hm->trace[type0]) {
2624         s = (*hm->trace[type0])(s, opt0);
2625       } else {
2626         s = format (s, "\n    unrecognized option %d length %d", type0, opt0->length);
2627       }
2628       opt0 = (ip6_hop_by_hop_option_t *) (((u8 *)opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
2629       break;
2630     }
2631   }
2632   return s;
2633 }
2634
2635 /*
2636  * Process the Hop-by-Hop Options header
2637  */
2638 static uword
2639 ip6_hop_by_hop (vlib_main_t * vm,
2640                 vlib_node_runtime_t * node,
2641                 vlib_frame_t * frame)
2642 {
2643   vlib_node_runtime_t *error_node = vlib_node_get_runtime(vm, ip6_hop_by_hop_node.index);
2644   ip6_hop_by_hop_main_t *hm = &ip6_hop_by_hop_main;
2645   u32 n_left_from, *from, *to_next;
2646   ip_lookup_next_t next_index;
2647   ip6_main_t * im = &ip6_main;
2648   ip_lookup_main_t *lm = &im->lookup_main;
2649
2650   from = vlib_frame_vector_args (frame);
2651   n_left_from = frame->n_vectors;
2652   next_index = node->cached_next_index;
2653
2654   while (n_left_from > 0) {
2655     u32 n_left_to_next;
2656
2657     vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2658
2659     while (n_left_from > 0 && n_left_to_next > 0) {
2660       u32 bi0;
2661       vlib_buffer_t * b0;
2662       u32 next0;
2663       ip6_header_t * ip0;
2664       ip6_hop_by_hop_header_t *hbh0;
2665       ip6_hop_by_hop_option_t *opt0, *limit0;
2666       u8 type0;
2667       u8 error0 = 0;
2668
2669       /* Speculatively enqueue b0 to the current next frame */
2670       bi0 = from[0];
2671       to_next[0] = bi0;
2672       from += 1;
2673       to_next += 1;
2674       n_left_from -= 1;
2675       n_left_to_next -= 1;
2676
2677       b0 = vlib_get_buffer (vm, bi0);
2678       u32 adj_index0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
2679       ip_adjacency_t *adj0 = ip_get_adjacency(lm, adj_index0);
2680       /* Default use the next_index from the adjacency. A HBH option rarely redirects to a different node */
2681       next0 = adj0->lookup_next_index;
2682
2683       ip0 = vlib_buffer_get_current (b0);
2684       hbh0 = (ip6_hop_by_hop_header_t *)(ip0+1);
2685       opt0 = (ip6_hop_by_hop_option_t *)(hbh0+1);
2686       limit0 = (ip6_hop_by_hop_option_t *)((u8 *)hbh0 + ((hbh0->length + 1) << 3));
2687
2688       /*
2689        * Basic validity checks
2690        */
2691       if ((hbh0->length + 1) << 3 > clib_net_to_host_u16(ip0->payload_length)) {
2692         error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2693         next0 = IP_LOOKUP_NEXT_DROP;
2694         goto out0;
2695       }
2696
2697       /* Scan the set of h-b-h options, process ones that we understand */
2698       while (opt0 < limit0) {
2699         type0 = opt0->type;
2700         switch (type0) {
2701         case 0: /* Pad1 */
2702           opt0 = (ip6_hop_by_hop_option_t *) ((u8 *)opt0) + 1;
2703           continue;
2704         case 1: /* PadN */
2705           break;
2706         default:
2707           if (hm->options[type0]) {
2708             if ((*hm->options[type0])(b0, ip0, opt0) < 0) {
2709               error0 = IP6_HOP_BY_HOP_ERROR_FORMAT;
2710               goto out0;
2711             }
2712           } else {
2713             /* Unrecognized mandatory option, check the two high order bits */
2714             switch (opt0->type & HBH_OPTION_TYPE_HIGH_ORDER_BITS) {
2715             case HBH_OPTION_TYPE_SKIP_UNKNOWN:
2716               break;
2717             case HBH_OPTION_TYPE_DISCARD_UNKNOWN:
2718               next0 = IP_LOOKUP_NEXT_DROP;
2719               break;
2720             case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP:
2721               next0 = IP_LOOKUP_NEXT_ICMP_ERROR;
2722               icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
2723                                           ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
2724               break;
2725             case HBH_OPTION_TYPE_DISCARD_UNKNOWN_ICMP_NOT_MCAST:
2726               if (!ip6_address_is_multicast(&ip0->dst_address)) {
2727                 next0 =  IP_LOOKUP_NEXT_ICMP_ERROR;
2728                 icmp6_error_set_vnet_buffer(b0, ICMP6_parameter_problem,
2729                                             ICMP6_parameter_problem_unrecognized_option, (u8 *)opt0 - (u8 *)ip0);
2730               } else {
2731                 next0 =  IP_LOOKUP_NEXT_DROP;
2732               }
2733               break;
2734             }
2735             error0 = IP6_HOP_BY_HOP_ERROR_UNKNOWN_OPTION;
2736             goto out0;
2737           }
2738         }
2739         opt0 = (ip6_hop_by_hop_option_t *) (((u8 *)opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
2740       }
2741
2742     out0:
2743       /* Has the classifier flagged this buffer for special treatment? */
2744       if ((error0 == 0) && (vnet_buffer(b0)->l2_classify.opaque_index == OI_DECAP))
2745         next0 = IP6_LOOKUP_NEXT_POP_HOP_BY_HOP;
2746
2747       if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) {
2748         ip6_hop_by_hop_trace_t *t = vlib_add_trace(vm, node, b0, sizeof (*t));
2749         u32 trace_len = (hbh0->length + 1) << 3;
2750         t->next_index = next0;
2751         /* Capture the h-b-h option verbatim */
2752         trace_len = trace_len < ARRAY_LEN(t->option_data) ? trace_len : ARRAY_LEN(t->option_data);
2753         t->trace_len = trace_len;
2754         clib_memcpy(t->option_data, hbh0, trace_len);
2755       }
2756
2757       b0->error = error_node->errors[error0];
2758
2759       /* verify speculative enqueue, maybe switch current next frame */
2760       vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0);
2761     }
2762     vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2763   }
2764   return frame->n_vectors;
2765 }
2766
2767 VLIB_REGISTER_NODE (ip6_hop_by_hop_node) = {
2768   .function = ip6_hop_by_hop,
2769   .name = "ip6-hop-by-hop",
2770   .sibling_of = "ip6-lookup",
2771   .vector_size = sizeof (u32),
2772   .format_trace = format_ip6_hop_by_hop_trace,
2773   .type = VLIB_NODE_TYPE_INTERNAL,
2774   .n_errors = ARRAY_LEN(ip6_hop_by_hop_error_strings),
2775   .error_strings = ip6_hop_by_hop_error_strings,
2776   .n_next_nodes = 0,
2777 };
2778
2779 VLIB_NODE_FUNCTION_MULTIARCH (ip6_hop_by_hop_node, ip6_hop_by_hop)
2780
2781 static clib_error_t *
2782 ip6_hop_by_hop_init (vlib_main_t * vm)
2783 {
2784   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2785   memset(hm->options, 0, sizeof(hm->options));
2786   memset(hm->trace, 0, sizeof(hm->trace));
2787
2788   return (0);
2789 }
2790
2791 VLIB_INIT_FUNCTION (ip6_hop_by_hop_init);
2792
2793 int
2794 ip6_hbh_register_option (u8 option,
2795                          int options(vlib_buffer_t *b, ip6_header_t *ip, ip6_hop_by_hop_option_t *opt),
2796                          u8 *trace(u8 *s, ip6_hop_by_hop_option_t *opt))
2797 {
2798   ip6_main_t * im = &ip6_main;
2799   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2800
2801   ASSERT (option < ARRAY_LEN (hm->options));
2802
2803   /* Already registered */
2804   if (hm->options[option])
2805     return (-1);
2806
2807   hm->options[option] = options;
2808   hm->trace[option] = trace;
2809
2810   /* Set global variable */
2811   im->hbh_enabled = 1;
2812
2813   return (0);
2814 }
2815
2816 int
2817 ip6_hbh_unregister_option (u8 option)
2818 {
2819   ip6_main_t * im = &ip6_main;
2820   ip6_hop_by_hop_main_t * hm = &ip6_hop_by_hop_main;
2821
2822   ASSERT (option < ARRAY_LEN (hm->options));
2823
2824   /* Not registered */
2825   if (!hm->options[option])
2826     return (-1);
2827
2828   hm->options[option] = NULL;
2829   hm->trace[option] = NULL;
2830
2831   /* Disable global knob if this was the last option configured */
2832   int i;
2833   bool found = false;
2834   for (i = 0; i < 256; i++) {
2835     if (hm->options[option]) {
2836       found = true;
2837       break;
2838     }
2839   }
2840   if (!found)
2841     im->hbh_enabled = 0;
2842
2843   return (0);
2844 }
2845
2846 /* Global IP6 main. */
2847 ip6_main_t ip6_main;
2848
2849 static clib_error_t *
2850 ip6_lookup_init (vlib_main_t * vm)
2851 {
2852   ip6_main_t * im = &ip6_main;
2853   uword i;
2854
2855   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2856     {
2857       u32 j, i0, i1;
2858
2859       i0 = i / 32;
2860       i1 = i % 32;
2861
2862       for (j = 0; j < i0; j++)
2863         im->fib_masks[i].as_u32[j] = ~0;
2864
2865       if (i1)
2866         im->fib_masks[i].as_u32[i0] = clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2867     }
2868
2869   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2870
2871   if (im->lookup_table_nbuckets == 0)
2872     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2873
2874   im->lookup_table_nbuckets = 1<< max_log2 (im->lookup_table_nbuckets);
2875
2876   if (im->lookup_table_size == 0)
2877     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2878
2879   BV(clib_bihash_init) (&im->ip6_lookup_table, "ip6 lookup table",
2880                         im->lookup_table_nbuckets,
2881                         im->lookup_table_size);
2882
2883   /* Create FIB with index 0 and table id of 0. */
2884   find_ip6_fib_by_table_index_or_id (im, /* table id */ 0, IP6_ROUTE_FLAG_TABLE_ID);
2885
2886   {
2887     pg_node_t * pn;
2888     pn = pg_get_node (ip6_lookup_node.index);
2889     pn->unformat_edit = unformat_pg_ip6_header;
2890   }
2891
2892   /* Unless explicitly configured, don't process HBH options */
2893   im->hbh_enabled = 0;
2894
2895   {
2896     icmp6_neighbor_solicitation_header_t p;
2897
2898     memset (&p, 0, sizeof (p));
2899
2900     p.ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2901     p.ip.payload_length = clib_host_to_net_u16 (sizeof (p)
2902                                                 - STRUCT_OFFSET_OF (icmp6_neighbor_solicitation_header_t, neighbor));
2903     p.ip.protocol = IP_PROTOCOL_ICMP6;
2904     p.ip.hop_limit = 255;
2905     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2906
2907     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2908
2909     p.link_layer_option.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2910     p.link_layer_option.header.n_data_u64s = sizeof (p.link_layer_option) / sizeof (u64);
2911
2912     vlib_packet_template_init (vm,
2913                                &im->discover_neighbor_packet_template,
2914                                &p, sizeof (p),
2915                                /* alloc chunk size */ 8,
2916                                "ip6 neighbor discovery");
2917   }
2918
2919   ip6_feature_init (vm, im);
2920
2921   return 0;
2922 }
2923
2924 VLIB_INIT_FUNCTION (ip6_lookup_init);
2925
2926 static clib_error_t *
2927 add_del_ip6_interface_table (vlib_main_t * vm,
2928                              unformat_input_t * input,
2929                              vlib_cli_command_t * cmd)
2930 {
2931   vnet_main_t * vnm = vnet_get_main();
2932   clib_error_t * error = 0;
2933   u32 sw_if_index, table_id;
2934
2935   sw_if_index = ~0;
2936
2937   if (! unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2938     {
2939       error = clib_error_return (0, "unknown interface `%U'",
2940                                  format_unformat_error, input);
2941       goto done;
2942     }
2943
2944   if (unformat (input, "%d", &table_id))
2945     ;
2946   else
2947     {
2948       error = clib_error_return (0, "expected table id `%U'",
2949                                  format_unformat_error, input);
2950       goto done;
2951     }
2952
2953   {
2954     ip6_main_t * im = &ip6_main;
2955     ip6_fib_t * fib =
2956       find_ip6_fib_by_table_index_or_id (im, table_id, IP6_ROUTE_FLAG_TABLE_ID);
2957
2958     if (fib)
2959       {
2960         vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2961         im->fib_index_by_sw_if_index[sw_if_index] = fib->index;
2962     }
2963   }
2964
2965  done:
2966   return error;
2967 }
2968
2969 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) = {
2970   .path = "set interface ip6 table",
2971   .function = add_del_ip6_interface_table,
2972   .short_help = "set interface ip6 table <intfc> <table-id>"
2973 };
2974
2975 void
2976 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t *ip,
2977                                                   u8 *mac)
2978 {
2979   ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
2980   /* Invert the "u" bit */
2981   ip->as_u8 [8] = mac[0] ^ (1<<1);
2982   ip->as_u8 [9] = mac[1];
2983   ip->as_u8 [10] = mac[2];
2984   ip->as_u8 [11] = 0xFF;
2985   ip->as_u8 [12] = 0xFE;
2986   ip->as_u8 [13] = mac[3];
2987   ip->as_u8 [14] = mac[4];
2988   ip->as_u8 [15] = mac[5];
2989 }
2990
2991 void
2992 ip6_ethernet_mac_address_from_link_local_address (u8 *mac,
2993                                                   ip6_address_t *ip)
2994 {
2995   /* Invert the previously inverted "u" bit */
2996   mac[0] = ip->as_u8 [8] ^ (1<<1);
2997   mac[1] = ip->as_u8 [9];
2998   mac[2] = ip->as_u8 [10];
2999   mac[3] = ip->as_u8 [13];
3000   mac[4] = ip->as_u8 [14];
3001   mac[5] = ip->as_u8 [15];
3002 }
3003
3004 static clib_error_t *
3005 test_ip6_link_command_fn (vlib_main_t * vm,
3006                           unformat_input_t * input,
3007                           vlib_cli_command_t * cmd)
3008 {
3009   u8 mac[6];
3010   ip6_address_t _a, *a = &_a;
3011
3012   if (unformat (input, "%U", unformat_ethernet_address, mac))
3013     {
3014       ip6_link_local_address_from_ethernet_mac_address (a, mac);
3015       vlib_cli_output (vm, "Link local address: %U",
3016                        format_ip6_address, a);
3017       ip6_ethernet_mac_address_from_link_local_address (mac, a);
3018       vlib_cli_output (vm, "Original MAC address: %U",
3019                        format_ethernet_address, mac);
3020     }
3021
3022   return 0;
3023 }
3024
3025 VLIB_CLI_COMMAND (test_link_command, static) = {
3026   .path = "test ip6 link",
3027   .function = test_ip6_link_command_fn,
3028   .short_help = "test ip6 link <mac-address>",
3029 };
3030
3031 int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
3032 {
3033   ip6_main_t * im6 = &ip6_main;
3034   ip6_fib_t * fib;
3035   uword * p = hash_get (im6->fib_index_by_table_id, table_id);
3036
3037   if (p == 0)
3038     return -1;
3039
3040   fib = vec_elt_at_index (im6->fibs, p[0]);
3041
3042   fib->flow_hash_config = flow_hash_config;
3043   return 1;
3044 }
3045
3046 static clib_error_t *
3047 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
3048                               unformat_input_t * input,
3049                               vlib_cli_command_t * cmd)
3050 {
3051   int matched = 0;
3052   u32 table_id = 0;
3053   u32 flow_hash_config = 0;
3054   int rv;
3055
3056   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3057     if (unformat (input, "table %d", &table_id))
3058       matched = 1;
3059 #define _(a,v) \
3060     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
3061     foreach_flow_hash_bit
3062 #undef _
3063     else break;
3064   }
3065
3066   if (matched == 0)
3067     return clib_error_return (0, "unknown input `%U'",
3068                               format_unformat_error, input);
3069
3070   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
3071   switch (rv)
3072     {
3073     case 1:
3074       break;
3075
3076     case -1:
3077       return clib_error_return (0, "no such FIB table %d", table_id);
3078
3079     default:
3080       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
3081       break;
3082     }
3083
3084   return 0;
3085 }
3086
3087 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) = {
3088     .path = "set ip6 flow-hash",
3089     .short_help =
3090     "set ip table flow-hash table <fib-id> src dst sport dport proto reverse",
3091     .function = set_ip6_flow_hash_command_fn,
3092 };
3093
3094 static clib_error_t *
3095 show_ip6_local_command_fn (vlib_main_t * vm,
3096                            unformat_input_t * input,
3097                            vlib_cli_command_t * cmd)
3098 {
3099   ip6_main_t * im = &ip6_main;
3100   ip_lookup_main_t * lm = &im->lookup_main;
3101   int i;
3102
3103   vlib_cli_output (vm, "Protocols handled by ip6_local");
3104   for (i = 0; i < ARRAY_LEN(lm->local_next_by_ip_protocol); i++)
3105     {
3106       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
3107         vlib_cli_output (vm, "%d", i);
3108     }
3109   return 0;
3110 }
3111
3112
3113
3114 VLIB_CLI_COMMAND (show_ip_local, static) = {
3115   .path = "show ip6 local",
3116   .function = show_ip6_local_command_fn,
3117   .short_help = "Show ip6 local protocol table",
3118 };
3119
3120 int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
3121                                  u32 table_index)
3122 {
3123   vnet_main_t * vnm = vnet_get_main();
3124   vnet_interface_main_t * im = &vnm->interface_main;
3125   ip6_main_t * ipm = &ip6_main;
3126   ip_lookup_main_t * lm = &ipm->lookup_main;
3127   vnet_classify_main_t * cm = &vnet_classify_main;
3128
3129   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
3130     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
3131
3132   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
3133     return VNET_API_ERROR_NO_SUCH_ENTRY;
3134
3135   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
3136   lm->classify_table_index_by_sw_if_index [sw_if_index] = table_index;
3137
3138   return 0;
3139 }
3140
3141 static clib_error_t *
3142 set_ip6_classify_command_fn (vlib_main_t * vm,
3143                              unformat_input_t * input,
3144                              vlib_cli_command_t * cmd)
3145 {
3146   u32 table_index = ~0;
3147   int table_index_set = 0;
3148   u32 sw_if_index = ~0;
3149   int rv;
3150
3151   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3152     if (unformat (input, "table-index %d", &table_index))
3153       table_index_set = 1;
3154     else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
3155                        vnet_get_main(), &sw_if_index))
3156         ;
3157     else
3158         break;
3159   }
3160
3161   if (table_index_set == 0)
3162       return clib_error_return (0, "classify table-index must be specified");
3163
3164   if (sw_if_index == ~0)
3165     return clib_error_return (0, "interface / subif must be specified");
3166
3167   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
3168
3169   switch (rv)
3170     {
3171     case 0:
3172       break;
3173
3174     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
3175       return clib_error_return (0, "No such interface");
3176
3177     case VNET_API_ERROR_NO_SUCH_ENTRY:
3178       return clib_error_return (0, "No such classifier table");
3179     }
3180   return 0;
3181 }
3182
3183 VLIB_CLI_COMMAND (set_ip6_classify_command, static) = {
3184     .path = "set ip6 classify",
3185     .short_help =
3186     "set ip6 classify intfc <int> table-index <index>",
3187     .function = set_ip6_classify_command_fn,
3188 };
3189
3190 static clib_error_t *
3191 ip6_config (vlib_main_t * vm, unformat_input_t * input)
3192 {
3193   ip6_main_t * im = &ip6_main;
3194   uword heapsize = 0;
3195   u32 tmp;
3196   u32 nbuckets = 0;
3197
3198   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
3199     if (unformat (input, "hash-buckets %d", &tmp))
3200       nbuckets = tmp;
3201     else if (unformat (input, "heap-size %dm", &tmp))
3202       heapsize = ((u64)tmp) << 20;
3203     else if (unformat (input, "heap-size %dM", &tmp))
3204       heapsize = ((u64)tmp) << 20;
3205     else if (unformat (input, "heap-size %dg", &tmp))
3206       heapsize = ((u64)tmp) << 30;
3207     else if (unformat (input, "heap-size %dG", &tmp))
3208       heapsize = ((u64)tmp) << 30;
3209     else
3210       return clib_error_return (0, "unknown input '%U'",
3211                                 format_unformat_error, input);
3212   }
3213
3214   im->lookup_table_nbuckets = nbuckets;
3215   im->lookup_table_size = heapsize;
3216
3217   return 0;
3218 }
3219
3220 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
3221