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, next_hop_sw_if_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               add_adj.lookup_next_index = IP_LOOKUP_NEXT_INDIRECT;
 382               add_adj.indirect.next_hop.ip6.as_u64[0] = next_hop->as_u64[0];
 383               add_adj.indirect.next_hop.ip6.as_u64[1] = next_hop->as_u64[1];
 384               add_adj.explicit_fib_index = explicit_fib_index;
 385               ip_add_adjacency (lm, &add_adj, 1, &nh_adj_index);
 386             }
 387           }
 388           else
 389             nh_adj_index = value.value;
 390
 391         }
 392     }
 393   else
 394     {
 395       /* Look for the interface /128 route */
 396       kv.key[0] = next_hop->as_u64[0];
 397       kv.key[1] = next_hop->as_u64[1];
 398       kv.key[2] = ((u64)((fib - im->fibs))<<32) | 128;
 399
 400       if (BV(clib_bihash_search)(&im->ip6_lookup_table, &kv, &value) < 0)
 401         {
 402           vnm->api_errno = VNET_API_ERROR_UNKNOWN_DESTINATION;
 403           error = clib_error_return (0, "next-hop %U/128 not in FIB",
 404                                      format_ip6_address, next_hop);
 405           goto done;
 406         }
 407
 408       nh_adj_index = value.value;
 409     }
 410
 411   ASSERT (dst_address_length < ARRAY_LEN (im->fib_masks));
 412   masked_dst_address = dst_address[0];
 413   ip6_address_mask (&masked_dst_address, &im->fib_masks[dst_address_length]);
 414
 415   kv.key[0] = masked_dst_address.as_u64[0];
 416   kv.key[1] = masked_dst_address.as_u64[1];
 417   kv.key[2] = ((u64)((fib - im->fibs))<<32) | dst_address_length;
 418
 419   rv = BV(clib_bihash_search)(&im->ip6_lookup_table, &kv, &value);
 420
 421   if (rv == 0)
 422     {
 423       dst_adj_index = value.value;
 424       dst_adj = ip_get_adjacency (lm, dst_adj_index);
 425     }
 426   else
 427     {
 428       /* For deletes destination must be known. */
 429       if (is_del)
 430         {
 431           vnm->api_errno = VNET_API_ERROR_UNKNOWN_DESTINATION;
 432           error = clib_error_return (0, "unknown destination %U/%d",
 433                                      format_ip6_address, dst_address,
 434                                      dst_address_length);
 435           goto done;
 436         }
 437
 438       dst_adj_index = ~0;
 439       dst_adj = 0;
 440     }
 441
 442   /* Ignore adds of X/128 with next hop of X. */
 443   if (! is_del
 444       && dst_address_length == 128
 445       && ip6_address_is_equal (dst_address, next_hop))
 446     {
 447       vnm->api_errno = VNET_API_ERROR_PREFIX_MATCHES_NEXT_HOP;
 448       error = clib_error_return (0, "prefix matches next hop %U/%d",
 449                                  format_ip6_address, dst_address,
 450                                  dst_address_length);
 451       goto done;
 452     }
 453
 454   /* Destination is not known and default weight is set so add route
 455      to existing non-multipath adjacency */
 456   if (dst_adj_index == ~0 && next_hop_weight == 1 && next_hop_sw_if_index == ~0)
 457   {
 458     /* create new adjacency */
 459     ip6_add_del_route_args_t a;
 460     a.table_index_or_table_id = fib_index;
 461     a.flags = ((is_del ? IP6_ROUTE_FLAG_DEL : IP6_ROUTE_FLAG_ADD)
 462         | IP6_ROUTE_FLAG_FIB_INDEX
 463         | IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY
 464         | (flags & (IP6_ROUTE_FLAG_NO_REDISTRIBUTE
 465             | IP6_ROUTE_FLAG_NOT_LAST_IN_GROUP)));
 466     a.dst_address = dst_address[0];
 467     a.dst_address_length = dst_address_length;
 468     a.adj_index = nh_adj_index;
 469     a.add_adj = 0;
 470     a.n_add_adj = 0;
 471
 472     ip6_add_del_route (im, &a);
 473     goto done;
 474   }
 475
 476   old_mp_adj_index = dst_adj ? dst_adj->heap_handle : ~0;
 477
 478   if (! ip_multipath_adjacency_add_del_next_hop
 479       (lm, is_del,
 480        dst_adj ? dst_adj->heap_handle : ~0,
 481        nh_adj_index,
 482        next_hop_weight,
 483        &new_mp_adj_index))
 484     {
 485       vnm->api_errno = VNET_API_ERROR_NEXT_HOP_NOT_FOUND_MP;
 486       error = clib_error_return
 487         (0, "requested deleting next-hop %U not found in multi-path",
 488          format_ip6_address, next_hop);
 489       goto done;
 490     }
 491
 492   old_mp = new_mp = 0;
 493   if (old_mp_adj_index != ~0)
 494     old_mp = vec_elt_at_index (lm->multipath_adjacencies, old_mp_adj_index);
 495   if (new_mp_adj_index != ~0)
 496     new_mp = vec_elt_at_index (lm->multipath_adjacencies, new_mp_adj_index);
 497
 498   if (old_mp != new_mp)
 499     {
 500       ip6_add_del_route_args_t a;
 501       a.table_index_or_table_id = fib_index;
 502       a.flags = ((is_del ? IP6_ROUTE_FLAG_DEL : IP6_ROUTE_FLAG_ADD)
 503                  | IP6_ROUTE_FLAG_FIB_INDEX
 504                  | IP6_ROUTE_FLAG_KEEP_OLD_ADJACENCY
 505                  | (flags & IP6_ROUTE_FLAG_NO_REDISTRIBUTE));
 506       a.dst_address = dst_address[0];
 507       a.dst_address_length = dst_address_length;
 508       a.adj_index = new_mp ? new_mp->adj_index : dst_adj_index;
 509       a.add_adj = 0;
 510       a.n_add_adj = 0;
 511
 512       ip6_add_del_route (im, &a);
 513     }
 514
 515  done:
 516   if (error)
 517     clib_error_report (error);
 518 }
 519
 520 u32
 521 ip6_get_route (ip6_main_t * im,
 522                u32 table_index_or_table_id,
 523                u32 flags,
 524                ip6_address_t * address,
 525                u32 address_length)
 526 {
 527   ip6_fib_t * fib = find_ip6_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
 528   ip6_address_t masked_address;
 529   BVT(clib_bihash_kv) kv, value;
 530
 531   ASSERT (address_length < ARRAY_LEN (im->fib_masks));
 532   clib_memcpy (&masked_address, address, sizeof (masked_address));
 533   ip6_address_mask (&masked_address, &im->fib_masks[address_length]);
 534
 535   kv.key[0] = masked_address.as_u64[0];
 536   kv.key[1] = masked_address.as_u64[1];
 537   kv.key[2] = ((u64)((fib - im->fibs))<<32) | address_length;
 538
 539   if (BV(clib_bihash_search)(&im->ip6_lookup_table, &kv, &value) == 0)
 540     return (value.value);
 541   return 0;
 542 }
 543
 544 void
 545 ip6_foreach_matching_route (ip6_main_t * im,
 546                             u32 table_index_or_table_id,
 547                             u32 flags,
 548                             ip6_address_t * dst_address,
 549                             u32 address_length,
 550                             ip6_address_t ** results,
 551                             u8 ** result_lengths)
 552 {
 553   ip6_fib_t * fib =
 554     find_ip6_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
 555   BVT(clib_bihash) * h = &im->ip6_lookup_table;
 556   BVT(clib_bihash_value) * v;
 557   clib_bihash_bucket_t * b;
 558   int i, j, k;
 559
 560   if (*results)
 561     _vec_len (*results) = 0;
 562   if (*result_lengths)
 563     _vec_len (*result_lengths) = 0;
 564
 565   /* Walk the table looking for routes which match the supplied address */
 566   for (i = 0; i < h->nbuckets; i++)
 567     {
 568       b = &h->buckets [i];
 569       if (b->offset == 0)
 570           continue;
 571
 572       v = BV(clib_bihash_get_value) (h, b->offset);
 573       for (j = 0; j < (1<<b->log2_pages); j++)
 574         {
 575           for (k = 0; k < BIHASH_KVP_PER_PAGE; k++)
 576             {
 577               if (BV(clib_bihash_is_free)(&v->kvp[k]))
 578                 continue;
 579
 580               if ((v->kvp[k].key[2]
 581                    == (((u64)((fib - im->fibs))<<32) | address_length))
 582                   && ip6_destination_matches_route
 583                   (im, dst_address, (ip6_address_t *) &v->kvp[k],
 584                    address_length))
 585                 {
 586                   ip6_address_t * a;
 587
 588                   a = (ip6_address_t *)(&v->kvp[k]);
 589
 590                   vec_add1 (*results, a[0]);
 591                   vec_add1 (*result_lengths, address_length);
 592                 }
 593             }
 594           v++;
 595         }
 596     }
 597 }
 598
 599 void ip6_maybe_remap_adjacencies (ip6_main_t * im,
 600                                   u32 table_index_or_table_id,
 601                                   u32 flags)
 602 {
 603 #if SOONE
 604   ip6_fib_t * fib
 605     = find_ip6_fib_by_table_index_or_id (im, table_index_or_table_id, flags);
 606 #endif
 607   ip_lookup_main_t * lm = &im->lookup_main;
 608
 609   if (lm->n_adjacency_remaps == 0)
 610     return;
 611
 612   clib_warning ("unimplemented, please report to vpp-dev@cisco.com");
 613
 614   /* All remaps have been performed. */
 615   lm->n_adjacency_remaps = 0;
 616 }
 617
 618 void ip6_delete_matching_routes (ip6_main_t * im,
 619                                  u32 table_index_or_table_id,
 620                                  u32 flags,
 621                                  ip6_address_t * address,
 622                                  u32 address_length)
 623 {
 624   /* $$$$ static may be OK - this should happen only on thread 0 */
 625   static ip6_address_t * matching_addresses;
 626   static u8 * matching_address_lengths;
 627   u32 l, i;
 628   ip6_add_del_route_args_t a;
 629
 630   vlib_smp_unsafe_warning();
 631
 632   a.flags = IP6_ROUTE_FLAG_DEL | IP6_ROUTE_FLAG_NO_REDISTRIBUTE | flags;
 633   a.table_index_or_table_id = table_index_or_table_id;
 634   a.adj_index = ~0;
 635   a.add_adj = 0;
 636   a.n_add_adj = 0;
 637
 638   for (l = address_length + 1; l <= 128; l++)
 639     {
 640       ip6_foreach_matching_route (im, table_index_or_table_id, flags,
 641                                   address,
 642                                   l,
 643                                   &matching_addresses,
 644                                   &matching_address_lengths);
 645       for (i = 0; i < vec_len (matching_addresses); i++)
 646         {
 647           a.dst_address = matching_addresses[i];
 648           a.dst_address_length = matching_address_lengths[i];
 649           ip6_add_del_route (im, &a);
 650         }
 651     }
 652
 653   ip6_maybe_remap_adjacencies (im, table_index_or_table_id, flags);
 654 }
 655
 656 void
 657 ip6_forward_next_trace (vlib_main_t * vm,
 658                         vlib_node_runtime_t * node,
 659                         vlib_frame_t * frame,
 660                         vlib_rx_or_tx_t which_adj_index);
 661
 662 always_inline uword
 663 ip6_lookup_inline (vlib_main_t * vm,
 664                    vlib_node_runtime_t * node,
 665                    vlib_frame_t * frame,
 666                    int is_indirect)
 667 {
 668   ip6_main_t * im = &ip6_main;
 669   ip_lookup_main_t * lm = &im->lookup_main;
 670   vlib_combined_counter_main_t * cm = &im->lookup_main.adjacency_counters;
 671   u32 n_left_from, n_left_to_next, * from, * to_next;
 672   ip_lookup_next_t next;
 673   u32 cpu_index = os_get_cpu_number();
 674
 675   from = vlib_frame_vector_args (frame);
 676   n_left_from = frame->n_vectors;
 677   next = node->cached_next_index;
 678
 679   while (n_left_from > 0)
 680     {
 681       vlib_get_next_frame (vm, node, next,
 682                            to_next, n_left_to_next);
 683
 684       while (n_left_from >= 4 && n_left_to_next >= 2)
 685         {
 686           vlib_buffer_t * p0, * p1;
 687           u32 pi0, pi1, adj_index0, adj_index1, wrong_next;
 688           ip_lookup_next_t next0, next1;
 689           ip6_header_t * ip0, * ip1;
 690           ip_adjacency_t * adj0, * adj1;
 691           ip6_address_t * dst_addr0, * dst_addr1;
 692           u32 fib_index0, fib_index1;
 693           u32 flow_hash_config0, flow_hash_config1;
 694
 695           /* Prefetch next iteration. */
 696           {
 697             vlib_buffer_t * p2, * p3;
 698
 699             p2 = vlib_get_buffer (vm, from[2]);
 700             p3 = vlib_get_buffer (vm, from[3]);
 701
 702             vlib_prefetch_buffer_header (p2, LOAD);
 703             vlib_prefetch_buffer_header (p3, LOAD);
 704             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), LOAD);
 705             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), LOAD);
 706           }
 707
 708           pi0 = to_next[0] = from[0];
 709           pi1 = to_next[1] = from[1];
 710
 711           p0 = vlib_get_buffer (vm, pi0);
 712           p1 = vlib_get_buffer (vm, pi1);
 713
 714           ip0 = vlib_buffer_get_current (p0);
 715           ip1 = vlib_buffer_get_current (p1);
 716
 717           if (is_indirect)
 718             {
 719               ip_adjacency_t * iadj0, * iadj1;
 720               iadj0 = ip_get_adjacency (lm, vnet_buffer(p0)->ip.adj_index[VLIB_TX]);
 721               iadj1 = ip_get_adjacency (lm, vnet_buffer(p1)->ip.adj_index[VLIB_TX]);
 722               dst_addr0 = &iadj0->indirect.next_hop.ip6;
 723               dst_addr1 = &iadj1->indirect.next_hop.ip6;
 724             }
 725           else
 726             {
 727               dst_addr0 = &ip0->dst_address;
 728               dst_addr1 = &ip1->dst_address;
 729             }
 730
 731           fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
 732           fib_index1 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p1)->sw_if_index[VLIB_RX]);
 733
 734           fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
 735             fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
 736           fib_index1 = (vnet_buffer(p1)->sw_if_index[VLIB_TX] == (u32)~0) ?
 737             fib_index1 : vnet_buffer(p1)->sw_if_index[VLIB_TX];
 738
 739           adj_index0 = ip6_fib_lookup_with_table (im, fib_index0, dst_addr0);
 740           adj_index1 = ip6_fib_lookup_with_table (im, fib_index1, dst_addr1);
 741
 742           adj0 = ip_get_adjacency (lm, adj_index0);
 743           adj1 = ip_get_adjacency (lm, adj_index1);
 744
 745           if (PREDICT_FALSE (adj0->explicit_fib_index != ~0))
 746             {
 747               adj_index0 = ip6_fib_lookup_with_table
 748                 (im, adj0->explicit_fib_index, dst_addr0);
 749               adj0 = ip_get_adjacency (lm, adj_index0);
 750             }
 751           if (PREDICT_FALSE (adj1->explicit_fib_index != ~0))
 752             {
 753               adj_index1 = ip6_fib_lookup_with_table
 754                 (im, adj1->explicit_fib_index, dst_addr1);
 755               adj1 = ip_get_adjacency (lm, adj_index1);
 756             }
 757
 758           next0 = adj0->lookup_next_index;
 759           next1 = adj1->lookup_next_index;
 760
 761           /* Process hop-by-hop options if present */
 762           next0 = (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) ?
 763               IP_LOOKUP_NEXT_HOP_BY_HOP : next0;
 764           next1 = (ip1->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) ?
 765               IP_LOOKUP_NEXT_HOP_BY_HOP : next1;
 766
 767           vnet_buffer (p0)->ip.flow_hash =
 768             vnet_buffer(p1)->ip.flow_hash = 0;
 769
 770           if (PREDICT_FALSE(adj0->n_adj > 1))
 771             {
 772               flow_hash_config0 =
 773                 vec_elt_at_index (im->fibs,fib_index0)->flow_hash_config;
 774               vnet_buffer (p0)->ip.flow_hash =
 775                 ip6_compute_flow_hash (ip0, flow_hash_config0);
 776             }
 777
 778           if (PREDICT_FALSE(adj1->n_adj > 1))
 779             {
 780               flow_hash_config1 =
 781                 vec_elt_at_index (im->fibs,fib_index0)->flow_hash_config;
 782
 783               vnet_buffer (p1)->ip.flow_hash =
 784                 ip6_compute_flow_hash (ip1, flow_hash_config1);
 785             }
 786
 787           ASSERT (adj0->n_adj > 0);
 788           ASSERT (adj1->n_adj > 0);
 789           ASSERT (is_pow2 (adj0->n_adj));
 790           ASSERT (is_pow2 (adj1->n_adj));
 791           adj_index0 += (vnet_buffer (p0)->ip.flow_hash & (adj0->n_adj - 1));
 792           adj_index1 += (vnet_buffer (p1)->ip.flow_hash & (adj1->n_adj - 1));
 793
 794           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
 795           vnet_buffer (p1)->ip.adj_index[VLIB_TX] = adj_index1;
 796
 797           vlib_increment_combined_counter
 798               (cm, cpu_index, adj_index0, 1,
 799                vlib_buffer_length_in_chain (vm, p0));
 800           vlib_increment_combined_counter
 801               (cm, cpu_index, adj_index1, 1,
 802                vlib_buffer_length_in_chain (vm, p1));
 803
 804           from += 2;
 805           to_next += 2;
 806           n_left_to_next -= 2;
 807           n_left_from -= 2;
 808
 809           wrong_next = (next0 != next) + 2*(next1 != next);
 810           if (PREDICT_FALSE (wrong_next != 0))
 811             {
 812               switch (wrong_next)
 813                 {
 814                 case 1:
 815                   /* A B A */
 816                   to_next[-2] = pi1;
 817                   to_next -= 1;
 818                   n_left_to_next += 1;
 819                   vlib_set_next_frame_buffer (vm, node, next0, pi0);
 820                   break;
 821
 822                 case 2:
 823                   /* A A B */
 824                   to_next -= 1;
 825                   n_left_to_next += 1;
 826                   vlib_set_next_frame_buffer (vm, node, next1, pi1);
 827                   break;
 828
 829                 case 3:
 830                   /* A B C */
 831                   to_next -= 2;
 832                   n_left_to_next += 2;
 833                   vlib_set_next_frame_buffer (vm, node, next0, pi0);
 834                   vlib_set_next_frame_buffer (vm, node, next1, pi1);
 835                   if (next0 == next1)
 836                     {
 837                       /* A B B */
 838                       vlib_put_next_frame (vm, node, next, n_left_to_next);
 839                       next = next1;
 840                       vlib_get_next_frame (vm, node, next, to_next, n_left_to_next);
 841                     }
 842                 }
 843             }
 844         }
 845
 846       while (n_left_from > 0 && n_left_to_next > 0)
 847         {
 848           vlib_buffer_t * p0;
 849           ip6_header_t * ip0;
 850           u32 pi0, adj_index0;
 851           ip_lookup_next_t next0;
 852           ip_adjacency_t * adj0;
 853           ip6_address_t * dst_addr0;
 854           u32 fib_index0, flow_hash_config0;
 855
 856           pi0 = from[0];
 857           to_next[0] = pi0;
 858
 859           p0 = vlib_get_buffer (vm, pi0);
 860
 861           ip0 = vlib_buffer_get_current (p0);
 862
 863           if (is_indirect)
 864             {
 865               ip_adjacency_t * iadj0;
 866               iadj0 = ip_get_adjacency (lm, vnet_buffer(p0)->ip.adj_index[VLIB_TX]);
 867               dst_addr0 = &iadj0->indirect.next_hop.ip6;
 868             }
 869           else
 870             {
 871               dst_addr0 = &ip0->dst_address;
 872             }
 873
 874           fib_index0 = vec_elt (im->fib_index_by_sw_if_index, vnet_buffer (p0)->sw_if_index[VLIB_RX]);
 875           fib_index0 = (vnet_buffer(p0)->sw_if_index[VLIB_TX] == (u32)~0) ?
 876             fib_index0 : vnet_buffer(p0)->sw_if_index[VLIB_TX];
 877
 878           flow_hash_config0 =
 879               vec_elt_at_index (im->fibs,fib_index0)->flow_hash_config;
 880
 881           adj_index0 = ip6_fib_lookup_with_table (im, fib_index0, dst_addr0);
 882
 883           adj0 = ip_get_adjacency (lm, adj_index0);
 884
 885           if (PREDICT_FALSE (adj0->explicit_fib_index != ~0))
 886             {
 887               adj_index0 = ip6_fib_lookup_with_table
 888                 (im, adj0->explicit_fib_index, dst_addr0);
 889               adj0 = ip_get_adjacency (lm, adj_index0);
 890             }
 891
 892           next0 = adj0->lookup_next_index;
 893           next0 = (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS) ?
 894               IP_LOOKUP_NEXT_HOP_BY_HOP : next0;
 895
 896           vnet_buffer (p0)->ip.flow_hash = 0;
 897
 898           if (PREDICT_FALSE(adj0->n_adj > 1))
 899             {
 900               flow_hash_config0 =
 901                 vec_elt_at_index (im->fibs,fib_index0)->flow_hash_config;
 902               vnet_buffer (p0)->ip.flow_hash =
 903                 ip6_compute_flow_hash (ip0, flow_hash_config0);
 904             }
 905
 906           ASSERT (adj0->n_adj > 0);
 907           ASSERT (is_pow2 (adj0->n_adj));
 908           adj_index0 += (vnet_buffer (p0)->ip.flow_hash & (adj0->n_adj - 1));
 909
 910           vnet_buffer (p0)->ip.adj_index[VLIB_TX] = adj_index0;
 911
 912           vlib_increment_combined_counter
 913               (cm, cpu_index, adj_index0, 1,
 914                vlib_buffer_length_in_chain (vm, p0));
 915
 916           from += 1;
 917           to_next += 1;
 918           n_left_to_next -= 1;
 919           n_left_from -= 1;
 920
 921           if (PREDICT_FALSE (next0 != next))
 922             {
 923               n_left_to_next += 1;
 924               vlib_put_next_frame (vm, node, next, n_left_to_next);
 925               next = next0;
 926               vlib_get_next_frame (vm, node, next,
 927                                    to_next, n_left_to_next);
 928               to_next[0] = pi0;
 929               to_next += 1;
 930               n_left_to_next -= 1;
 931             }
 932         }
 933
 934       vlib_put_next_frame (vm, node, next, n_left_to_next);
 935     }
 936
 937   if (node->flags & VLIB_NODE_FLAG_TRACE)
 938       ip6_forward_next_trace(vm, node, frame, VLIB_TX);
 939
 940   return frame->n_vectors;
 941 }
 942
 943 void ip6_adjacency_set_interface_route (vnet_main_t * vnm,
 944                                         ip_adjacency_t * adj,
 945                                         u32 sw_if_index,
 946                                         u32 if_address_index)
 947 {
 948   vnet_hw_interface_t * hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
 949   ip_lookup_next_t n;
 950   u32 node_index;
 951
 952   if (hw->hw_class_index == ethernet_hw_interface_class.index
 953       || hw->hw_class_index == srp_hw_interface_class.index)
 954     {
 955       n = IP_LOOKUP_NEXT_ARP;
 956       node_index = ip6_discover_neighbor_node.index;
 957       adj->if_address_index = if_address_index;
 958       adj->arp.next_hop.ip6.as_u64[0] = 0;
 959       adj->arp.next_hop.ip6.as_u64[1] = 0;
 960   }
 961   else
 962     {
 963       n = IP_LOOKUP_NEXT_REWRITE;
 964       node_index = ip6_rewrite_node.index;
 965     }
 966
 967  adj->lookup_next_index = n;
 968  adj->explicit_fib_index = ~0;
 969
 970  vnet_rewrite_for_sw_interface
 971    (vnm,
 972     VNET_L3_PACKET_TYPE_IP6,
 973     sw_if_index,
 974     node_index,
 975     VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST,
 976     &adj->rewrite_header,
 977     sizeof (adj->rewrite_data));
 978 }
 979
 980 static void
 981 ip6_add_interface_routes (vnet_main_t * vnm, u32 sw_if_index,
 982                           ip6_main_t * im, u32 fib_index,
 983                           ip_interface_address_t * a)
 984 {
 985   ip_lookup_main_t * lm = &im->lookup_main;
 986   ip_adjacency_t * adj;
 987   ip6_address_t * address = ip_interface_address_get_address (lm, a);
 988   ip6_add_del_route_args_t x;
 989   vnet_hw_interface_t * hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
 990   u32 classify_table_index;
 991
 992   /* Add e.g. 1.0.0.0/8 as interface route (arp for Ethernet). */
 993   x.table_index_or_table_id = fib_index;
 994   x.flags = (IP6_ROUTE_FLAG_ADD
 995              | IP6_ROUTE_FLAG_FIB_INDEX
 996              | IP6_ROUTE_FLAG_NO_REDISTRIBUTE);
 997   x.dst_address = address[0];
 998   x.dst_address_length = a->address_length;
 999   x.n_add_adj = 0;
1000   x.add_adj = 0;
1001
1002   a->neighbor_probe_adj_index = ~0;
1003   if (a->address_length < 128)
1004     {
1005       adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
1006                               &x.adj_index);
1007       ip6_adjacency_set_interface_route (vnm, adj, sw_if_index, a - lm->if_address_pool);
1008       ip_call_add_del_adjacency_callbacks (lm, x.adj_index, /* is_del */ 0);
1009       ip6_add_del_route (im, &x);
1010       a->neighbor_probe_adj_index = x.adj_index;
1011     }
1012
1013   /* Add e.g. ::1/128 as local to this host. */
1014   adj = ip_add_adjacency (lm, /* template */ 0, /* block size */ 1,
1015                           &x.adj_index);
1016
1017   classify_table_index = ~0;
1018   if (sw_if_index < vec_len (lm->classify_table_index_by_sw_if_index))
1019     classify_table_index = lm->classify_table_index_by_sw_if_index [sw_if_index];
1020   if (classify_table_index != (u32) ~0)
1021     {
1022       adj->lookup_next_index = IP_LOOKUP_NEXT_CLASSIFY;
1023       adj->classify.table_index = classify_table_index;
1024     }
1025   else
1026     adj->lookup_next_index = IP_LOOKUP_NEXT_LOCAL;
1027
1028   adj->if_address_index = a - lm->if_address_pool;
1029   adj->rewrite_header.sw_if_index = sw_if_index;
1030   adj->rewrite_header.max_l3_packet_bytes = hw_if->max_l3_packet_bytes[VLIB_RX];
1031   adj->rewrite_header.data_bytes = 0;
1032   ip_call_add_del_adjacency_callbacks (lm, x.adj_index, /* is_del */ 0);
1033   x.dst_address_length = 128;
1034   ip6_add_del_route (im, &x);
1035 }
1036
1037 static void
1038 ip6_del_interface_routes (ip6_main_t * im, u32 fib_index,
1039                           ip6_address_t * address, u32 address_length)
1040 {
1041   ip6_add_del_route_args_t x;
1042
1043   /* Add e.g. 1.0.0.0/8 as interface route (arp for Ethernet). */
1044   x.table_index_or_table_id = fib_index;
1045   x.flags = (IP6_ROUTE_FLAG_DEL
1046              | IP6_ROUTE_FLAG_FIB_INDEX
1047              | IP6_ROUTE_FLAG_NO_REDISTRIBUTE);
1048   x.dst_address = address[0];
1049   x.dst_address_length = address_length;
1050   x.adj_index = ~0;
1051   x.n_add_adj = 0;
1052   x.add_adj = 0;
1053
1054   if (address_length < 128)
1055     {
1056       /* Don't wipe out fe80::0/64 */
1057       if (address_length != 64 ||
1058           address[0].as_u64[0] != clib_net_to_host_u64(0xfe80000000000000ULL))
1059         ip6_add_del_route (im, &x);
1060     }
1061
1062   x.dst_address_length = 128;
1063   ip6_add_del_route (im, &x);
1064
1065   ip6_delete_matching_routes (im,
1066                               fib_index,
1067                               IP6_ROUTE_FLAG_FIB_INDEX,
1068                               address,
1069                               address_length);
1070 }
1071
1072 typedef struct {
1073     u32 sw_if_index;
1074     ip6_address_t address;
1075     u32 length;
1076 } ip6_interface_address_t;
1077
1078 static clib_error_t *
1079 ip6_add_del_interface_address_internal (vlib_main_t * vm,
1080                                         u32 sw_if_index,
1081                                         ip6_address_t * new_address,
1082                                         u32 new_length,
1083                                         u32 redistribute,
1084                                         u32 insert_routes,
1085                                         u32 is_del);
1086
1087 static clib_error_t *
1088 ip6_add_del_interface_address_internal (vlib_main_t * vm,
1089                                         u32 sw_if_index,
1090                                         ip6_address_t * address,
1091                                         u32 address_length,
1092                                         u32 redistribute,
1093                                         u32 insert_routes,
1094                                         u32 is_del)
1095 {
1096   vnet_main_t * vnm = vnet_get_main();
1097   ip6_main_t * im = &ip6_main;
1098   ip_lookup_main_t * lm = &im->lookup_main;
1099   clib_error_t * error;
1100   u32 if_address_index;
1101   ip6_address_fib_t ip6_af, * addr_fib = 0;
1102
1103   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1104   ip6_addr_fib_init (&ip6_af, address,
1105                      vec_elt (im->fib_index_by_sw_if_index, sw_if_index));
1106   vec_add1 (addr_fib, ip6_af);
1107
1108   {
1109     uword elts_before = pool_elts (lm->if_address_pool);
1110
1111     error = ip_interface_address_add_del
1112       (lm,
1113        sw_if_index,
1114        addr_fib,
1115        address_length,
1116        is_del,
1117        &if_address_index);
1118     if (error)
1119       goto done;
1120
1121     /* Pool did not grow: add duplicate address. */
1122     if (elts_before == pool_elts (lm->if_address_pool))
1123       goto done;
1124   }
1125
1126   if (vnet_sw_interface_is_admin_up (vnm, sw_if_index) && insert_routes)
1127     {
1128       if (is_del)
1129         ip6_del_interface_routes (im, ip6_af.fib_index, address,
1130                                   address_length);
1131
1132       else
1133         ip6_add_interface_routes (vnm, sw_if_index,
1134                                   im, ip6_af.fib_index,
1135                                   pool_elt_at_index (lm->if_address_pool, if_address_index));
1136     }
1137
1138   {
1139     ip6_add_del_interface_address_callback_t * cb;
1140     vec_foreach (cb, im->add_del_interface_address_callbacks)
1141       cb->function (im, cb->function_opaque, sw_if_index,
1142                     address, address_length,
1143                     if_address_index,
1144                     is_del);
1145   }
1146
1147  done:
1148   vec_free (addr_fib);
1149   return error;
1150 }
1151
1152 clib_error_t *
1153 ip6_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
1154                                ip6_address_t * address, u32 address_length,
1155                                u32 is_del)
1156 {
1157   return ip6_add_del_interface_address_internal
1158     (vm, sw_if_index, address, address_length,
1159      /* redistribute */ 1,
1160      /* insert_routes */ 1,
1161      is_del);
1162 }
1163
1164 clib_error_t *
1165 ip6_sw_interface_admin_up_down (vnet_main_t * vnm,
1166                                 u32 sw_if_index,
1167                                 u32 flags)
1168 {
1169   ip6_main_t * im = &ip6_main;
1170   ip_interface_address_t * ia;
1171   ip6_address_t * a;
1172   u32 is_admin_up, fib_index;
1173
1174   /* Fill in lookup tables with default table (0). */
1175   vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
1176
1177   vec_validate_init_empty (im->lookup_main.if_address_pool_index_by_sw_if_index, sw_if_index, ~0);
1178
1179   is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
1180
1181   fib_index = vec_elt (im->fib_index_by_sw_if_index, sw_if_index);
1182
1183   foreach_ip_interface_address (&im->lookup_main, ia, sw_if_index,
1184                                 0 /* honor unnumbered */,
1185   ({
1186     a = ip_interface_address_get_address (&im->lookup_main, ia);
1187     if (is_admin_up)
1188       ip6_add_interface_routes (vnm, sw_if_index,
1189                                 im, fib_index,
1190                                 ia);
1191     else
1192       ip6_del_interface_routes (im, fib_index,
1193                                 a, ia->address_length);
1194   }));
1195
1196   return 0;
1197 }
1198
1199 VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (ip6_sw_interface_admin_up_down);
1200
1201 clib_error_t *
1202 ip6_sw_interface_add_del (vnet_main_t * vnm,
1203                           u32 sw_if_index,
1204                           u32 is_add)
1205 {
1206   vlib_main_t * vm = vnm->vlib_main;
1207   ip6_main_t * im = &ip6_main;
1208   ip_lookup_main_t * lm = &im->lookup_main;
1209   u32 ci, cast;
1210
1211   for (cast = 0; cast < VNET_N_CAST; cast++)
1212     {
1213       ip_config_main_t * cm = &lm->rx_config_mains[cast];
1214       vnet_config_main_t * vcm = &cm->config_main;
1215
1216       /* FIXME multicast. */
1217       if (! vcm->node_index_by_feature_index)
1218         {
1219           char * start_nodes[] = { "ip6-input", };
1220           char * feature_nodes[] = {
1221             [IP6_RX_FEATURE_CHECK_ACCESS] = "ip6-inacl",
1222             [IP6_RX_FEATURE_IPSEC] = "ipsec-input-ip6",
1223             [IP6_RX_FEATURE_L2TPV3] = "l2tp-decap",
1224             [IP6_RX_FEATURE_VPATH]  = "vpath-input-ip6",
1225             [IP6_RX_FEATURE_LOOKUP] = "ip6-lookup",
1226           };
1227           vnet_config_init (vm, vcm,
1228                             start_nodes, ARRAY_LEN (start_nodes),
1229                             feature_nodes, ARRAY_LEN (feature_nodes));
1230         }
1231
1232       vec_validate_init_empty (cm->config_index_by_sw_if_index, sw_if_index, ~0);
1233       ci = cm->config_index_by_sw_if_index[sw_if_index];
1234
1235       if (is_add)
1236         ci = vnet_config_add_feature (vm, vcm,
1237                                       ci,
1238                                       IP6_RX_FEATURE_LOOKUP,
1239                                       /* config data */ 0,
1240                                       /* # bytes of config data */ 0);
1241       else
1242         ci = vnet_config_del_feature (vm, vcm,
1243                                       ci,
1244                                       IP6_RX_FEATURE_LOOKUP,
1245                                       /* config data */ 0,
1246                                       /* # bytes of config data */ 0);
1247
1248       cm->config_index_by_sw_if_index[sw_if_index] = ci;
1249     }
1250   return /* no error */ 0;
1251 }
1252
1253 VNET_SW_INTERFACE_ADD_DEL_FUNCTION (ip6_sw_interface_add_del);
1254
1255 static uword
1256 ip6_lookup (vlib_main_t * vm,
1257             vlib_node_runtime_t * node,
1258             vlib_frame_t * frame)
1259 {
1260   return ip6_lookup_inline (vm, node, frame, /* is_indirect */ 0);
1261 }
1262
1263 static u8 * format_ip6_lookup_trace (u8 * s, va_list * args);
1264
1265 VLIB_REGISTER_NODE (ip6_lookup_node) = {
1266   .function = ip6_lookup,
1267   .name = "ip6-lookup",
1268   .vector_size = sizeof (u32),
1269
1270   .format_trace = format_ip6_lookup_trace,
1271
1272   .n_next_nodes = IP_LOOKUP_N_NEXT,
1273   .next_nodes = IP6_LOOKUP_NEXT_NODES,
1274 };
1275
1276 static uword
1277 ip6_indirect (vlib_main_t * vm,
1278               vlib_node_runtime_t * node,
1279               vlib_frame_t * frame)
1280 {
1281   return ip6_lookup_inline (vm, node, frame, /* is_indirect */ 1);
1282 }
1283
1284
1285 VLIB_REGISTER_NODE (ip6_indirect_node) = {
1286   .function = ip6_indirect,
1287   .name = "ip6-indirect",
1288   .vector_size = sizeof (u32),
1289
1290   .format_trace = format_ip6_lookup_trace,
1291
1292   .n_next_nodes = IP_LOOKUP_N_NEXT,
1293   .next_nodes = IP6_LOOKUP_NEXT_NODES,
1294 };
1295
1296 typedef struct {
1297   /* Adjacency taken. */
1298   u32 adj_index;
1299   u32 flow_hash;
1300   u32 fib_index;
1301
1302   /* Packet data, possibly *after* rewrite. */
1303   u8 packet_data[128 - 1*sizeof(u32)];
1304 } ip6_forward_next_trace_t;
1305
1306 static u8 * format_ip6_forward_next_trace (u8 * s, va_list * args)
1307 {
1308   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1309   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1310   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
1311   uword indent = format_get_indent (s);
1312
1313   s = format(s, "%U%U",
1314              format_white_space, indent,
1315              format_ip6_header, t->packet_data);
1316   return s;
1317 }
1318
1319 static u8 * format_ip6_lookup_trace (u8 * s, va_list * args)
1320 {
1321   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1322   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1323   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
1324   vnet_main_t * vnm = vnet_get_main();
1325   ip6_main_t * im = &ip6_main;
1326   uword indent = format_get_indent (s);
1327
1328   s = format (s, "fib %d adj-idx %d : %U flow hash: 0x%08x",
1329               t->fib_index, t->adj_index, format_ip_adjacency,
1330               vnm, &im->lookup_main, t->adj_index, t->flow_hash);
1331   s = format(s, "\n%U%U",
1332              format_white_space, indent,
1333              format_ip6_header, t->packet_data);
1334   return s;
1335 }
1336
1337
1338 static u8 * format_ip6_rewrite_trace (u8 * s, va_list * args)
1339 {
1340   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
1341   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
1342   ip6_forward_next_trace_t * t = va_arg (*args, ip6_forward_next_trace_t *);
1343   vnet_main_t * vnm = vnet_get_main();
1344   ip6_main_t * im = &ip6_main;
1345   uword indent = format_get_indent (s);
1346
1347   s = format (s, "tx_sw_if_index %d adj-idx %d : %U flow hash: 0x%08x",
1348               t->fib_index, t->adj_index, format_ip_adjacency,
1349               vnm, &im->lookup_main, t->adj_index, t->flow_hash);
1350   s = format (s, "\n%U%U",
1351               format_white_space, indent,
1352               format_ip_adjacency_packet_data,
1353               vnm, &im->lookup_main, t->adj_index,
1354               t->packet_data, sizeof (t->packet_data));
1355   return s;
1356 }
1357
1358 /* Common trace function for all ip6-forward next nodes. */
1359 void
1360 ip6_forward_next_trace (vlib_main_t * vm,
1361                         vlib_node_runtime_t * node,
1362                         vlib_frame_t * frame,
1363                         vlib_rx_or_tx_t which_adj_index)
1364 {
1365   u32 * from, n_left;
1366   ip6_main_t * im = &ip6_main;
1367
1368   n_left = frame->n_vectors;
1369   from = vlib_frame_vector_args (frame);
1370
1371   while (n_left >= 4)
1372     {
1373       u32 bi0, bi1;
1374       vlib_buffer_t * b0, * b1;
1375       ip6_forward_next_trace_t * t0, * t1;
1376
1377       /* Prefetch next iteration. */
1378       vlib_prefetch_buffer_with_index (vm, from[2], LOAD);
1379       vlib_prefetch_buffer_with_index (vm, from[3], LOAD);
1380
1381       bi0 = from[0];
1382       bi1 = from[1];
1383
1384       b0 = vlib_get_buffer (vm, bi0);
1385       b1 = vlib_get_buffer (vm, bi1);
1386
1387       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1388         {
1389           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1390           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1391           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1392           t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
1393               vnet_buffer(b0)->sw_if_index[VLIB_TX] :
1394               vec_elt (im->fib_index_by_sw_if_index,
1395                        vnet_buffer(b0)->sw_if_index[VLIB_RX]);
1396
1397           clib_memcpy (t0->packet_data,
1398                   vlib_buffer_get_current (b0),
1399                   sizeof (t0->packet_data));
1400         }
1401       if (b1->flags & VLIB_BUFFER_IS_TRACED)
1402         {
1403           t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0]));
1404           t1->adj_index = vnet_buffer (b1)->ip.adj_index[which_adj_index];
1405           t1->flow_hash = vnet_buffer (b1)->ip.flow_hash;
1406           t1->fib_index = (vnet_buffer(b1)->sw_if_index[VLIB_TX] != (u32)~0) ?
1407               vnet_buffer(b1)->sw_if_index[VLIB_TX] :
1408               vec_elt (im->fib_index_by_sw_if_index,
1409                        vnet_buffer(b1)->sw_if_index[VLIB_RX]);
1410
1411           clib_memcpy (t1->packet_data,
1412                   vlib_buffer_get_current (b1),
1413                   sizeof (t1->packet_data));
1414         }
1415       from += 2;
1416       n_left -= 2;
1417     }
1418
1419   while (n_left >= 1)
1420     {
1421       u32 bi0;
1422       vlib_buffer_t * b0;
1423       ip6_forward_next_trace_t * t0;
1424
1425       bi0 = from[0];
1426
1427       b0 = vlib_get_buffer (vm, bi0);
1428
1429       if (b0->flags & VLIB_BUFFER_IS_TRACED)
1430         {
1431           t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
1432           t0->adj_index = vnet_buffer (b0)->ip.adj_index[which_adj_index];
1433           t0->flow_hash = vnet_buffer (b0)->ip.flow_hash;
1434           t0->fib_index = (vnet_buffer(b0)->sw_if_index[VLIB_TX] != (u32)~0) ?
1435               vnet_buffer(b0)->sw_if_index[VLIB_TX] :
1436               vec_elt (im->fib_index_by_sw_if_index,
1437                        vnet_buffer(b0)->sw_if_index[VLIB_RX]);
1438
1439           clib_memcpy (t0->packet_data,
1440                   vlib_buffer_get_current (b0),
1441                   sizeof (t0->packet_data));
1442         }
1443       from += 1;
1444       n_left -= 1;
1445     }
1446 }
1447
1448 static uword
1449 ip6_drop_or_punt (vlib_main_t * vm,
1450                   vlib_node_runtime_t * node,
1451                   vlib_frame_t * frame,
1452                   ip6_error_t error_code)
1453 {
1454   u32 * buffers = vlib_frame_vector_args (frame);
1455   uword n_packets = frame->n_vectors;
1456
1457   vlib_error_drop_buffers (vm, node,
1458                            buffers,
1459                            /* stride */ 1,
1460                            n_packets,
1461                            /* next */ 0,
1462                            ip6_input_node.index,
1463                            error_code);
1464
1465   if (node->flags & VLIB_NODE_FLAG_TRACE)
1466     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1467
1468   return n_packets;
1469 }
1470
1471 static uword
1472 ip6_drop (vlib_main_t * vm,
1473           vlib_node_runtime_t * node,
1474           vlib_frame_t * frame)
1475 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_DROP); }
1476
1477 static uword
1478 ip6_punt (vlib_main_t * vm,
1479           vlib_node_runtime_t * node,
1480           vlib_frame_t * frame)
1481 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_ADJACENCY_PUNT); }
1482
1483 static uword
1484 ip6_miss (vlib_main_t * vm,
1485           vlib_node_runtime_t * node,
1486           vlib_frame_t * frame)
1487 { return ip6_drop_or_punt (vm, node, frame, IP6_ERROR_DST_LOOKUP_MISS); }
1488
1489 VLIB_REGISTER_NODE (ip6_drop_node,static) = {
1490   .function = ip6_drop,
1491   .name = "ip6-drop",
1492   .vector_size = sizeof (u32),
1493
1494   .format_trace = format_ip6_forward_next_trace,
1495
1496   .n_next_nodes = 1,
1497   .next_nodes = {
1498     [0] = "error-drop",
1499   },
1500 };
1501
1502 VLIB_REGISTER_NODE (ip6_punt_node,static) = {
1503   .function = ip6_punt,
1504   .name = "ip6-punt",
1505   .vector_size = sizeof (u32),
1506
1507   .format_trace = format_ip6_forward_next_trace,
1508
1509   .n_next_nodes = 1,
1510   .next_nodes = {
1511     [0] = "error-punt",
1512   },
1513 };
1514
1515 VLIB_REGISTER_NODE (ip6_miss_node,static) = {
1516   .function = ip6_miss,
1517   .name = "ip6-miss",
1518   .vector_size = sizeof (u32),
1519
1520   .format_trace = format_ip6_forward_next_trace,
1521
1522   .n_next_nodes = 1,
1523   .next_nodes = {
1524     [0] = "error-drop",
1525   },
1526 };
1527
1528 VLIB_REGISTER_NODE (ip6_multicast_node,static) = {
1529   .function = ip6_drop,
1530   .name = "ip6-multicast",
1531   .vector_size = sizeof (u32),
1532
1533   .format_trace = format_ip6_forward_next_trace,
1534
1535   .n_next_nodes = 1,
1536   .next_nodes = {
1537     [0] = "error-drop",
1538   },
1539 };
1540
1541 /* Compute TCP/UDP/ICMP6 checksum in software. */
1542 u16 ip6_tcp_udp_icmp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip6_header_t * ip0, int *bogus_lengthp)
1543 {
1544   ip_csum_t sum0;
1545   u16 sum16, payload_length_host_byte_order;
1546   u32 i, n_this_buffer, n_bytes_left;
1547   u32 headers_size = sizeof(ip0[0]);
1548   void * data_this_buffer;
1549
1550   ASSERT(bogus_lengthp);
1551   *bogus_lengthp = 0;
1552
1553   /* Initialize checksum with ip header. */
1554   sum0 = ip0->payload_length + clib_host_to_net_u16 (ip0->protocol);
1555   payload_length_host_byte_order = clib_net_to_host_u16 (ip0->payload_length);
1556   data_this_buffer = (void *) (ip0 + 1);
1557
1558   for (i = 0; i < ARRAY_LEN (ip0->src_address.as_uword); i++)
1559     {
1560       sum0 = ip_csum_with_carry (sum0,
1561                                  clib_mem_unaligned (&ip0->src_address.as_uword[i], uword));
1562       sum0 = ip_csum_with_carry (sum0,
1563                                  clib_mem_unaligned (&ip0->dst_address.as_uword[i], uword));
1564     }
1565
1566   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1567   if (PREDICT_FALSE (ip0->protocol ==  IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS))
1568     {
1569       u32  skip_bytes;
1570       ip6_hop_by_hop_ext_t *ext_hdr = (ip6_hop_by_hop_ext_t  *)data_this_buffer;
1571
1572       /* validate really icmp6 next */
1573       ASSERT(ext_hdr->next_hdr == IP_PROTOCOL_ICMP6);
1574
1575       skip_bytes = 8* (1 + ext_hdr->n_data_u64s);
1576       data_this_buffer  = (void *)((u8 *)data_this_buffer + skip_bytes);
1577
1578       payload_length_host_byte_order  -= skip_bytes;
1579       headers_size += skip_bytes;
1580    }
1581
1582   n_bytes_left = n_this_buffer = payload_length_host_byte_order;
1583 #if DPDK > 0
1584   if (p0 && n_this_buffer + headers_size  > p0->current_length)
1585   {
1586     struct rte_mbuf *mb = rte_mbuf_from_vlib_buffer(p0);
1587     u8 nb_segs = mb->nb_segs;
1588
1589     n_this_buffer = (p0->current_length > headers_size ?
1590                      p0->current_length - headers_size : 0);
1591     while (n_bytes_left)
1592       {
1593         sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1594         n_bytes_left -= n_this_buffer;
1595
1596         mb = mb->next;
1597         nb_segs--;
1598         if ((nb_segs == 0) || (mb == 0))
1599           break;
1600
1601         data_this_buffer = rte_ctrlmbuf_data(mb);
1602         n_this_buffer = mb->data_len;
1603       }
1604     if (n_bytes_left || nb_segs)
1605       {
1606         *bogus_lengthp = 1;
1607         return 0xfefe;
1608       }
1609   }
1610   else sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1611 #else
1612   if (p0 && n_this_buffer + headers_size  > p0->current_length)
1613     n_this_buffer = p0->current_length > headers_size  ? p0->current_length - headers_size  : 0;
1614   while (1)
1615     {
1616       sum0 = ip_incremental_checksum (sum0, data_this_buffer, n_this_buffer);
1617       n_bytes_left -= n_this_buffer;
1618       if (n_bytes_left == 0)
1619         break;
1620
1621       if (!(p0->flags & VLIB_BUFFER_NEXT_PRESENT))
1622         {
1623           *bogus_lengthp = 1;
1624           return 0xfefe;
1625         }
1626       p0 = vlib_get_buffer (vm, p0->next_buffer);
1627       data_this_buffer = vlib_buffer_get_current (p0);
1628       n_this_buffer = p0->current_length;
1629     }
1630 #endif /* DPDK */
1631
1632   sum16 = ~ ip_csum_fold (sum0);
1633
1634   return sum16;
1635 }
1636
1637 u32 ip6_tcp_udp_icmp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
1638 {
1639   ip6_header_t * ip0 = vlib_buffer_get_current (p0);
1640   udp_header_t * udp0;
1641   u16 sum16;
1642   int bogus_length;
1643
1644   /* some icmp packets may come with a "router alert" hop-by-hop extension header (e.g., mldv2 packets) */
1645   ASSERT (ip0->protocol == IP_PROTOCOL_TCP
1646           || ip0->protocol == IP_PROTOCOL_ICMP6
1647           || ip0->protocol == IP_PROTOCOL_UDP
1648           || ip0->protocol ==  IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS);
1649
1650   udp0 = (void *) (ip0 + 1);
1651   if (ip0->protocol == IP_PROTOCOL_UDP && udp0->checksum == 0)
1652     {
1653       p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1654                     | IP_BUFFER_L4_CHECKSUM_CORRECT);
1655       return p0->flags;
1656     }
1657
1658   sum16 = ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0, &bogus_length);
1659
1660   p0->flags |= (IP_BUFFER_L4_CHECKSUM_COMPUTED
1661                 | ((sum16 == 0) << LOG2_IP_BUFFER_L4_CHECKSUM_CORRECT));
1662
1663   return p0->flags;
1664 }
1665
1666 static uword
1667 ip6_local (vlib_main_t * vm,
1668            vlib_node_runtime_t * node,
1669            vlib_frame_t * frame)
1670 {
1671   ip6_main_t * im = &ip6_main;
1672   ip_lookup_main_t * lm = &im->lookup_main;
1673   ip_local_next_t next_index;
1674   u32 * from, * to_next, n_left_from, n_left_to_next;
1675   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
1676
1677   from = vlib_frame_vector_args (frame);
1678   n_left_from = frame->n_vectors;
1679   next_index = node->cached_next_index;
1680
1681   if (node->flags & VLIB_NODE_FLAG_TRACE)
1682     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1683
1684   while (n_left_from > 0)
1685     {
1686       vlib_get_next_frame (vm, node, next_index,
1687                            to_next, n_left_to_next);
1688
1689       while (n_left_from >= 4 && n_left_to_next >= 2)
1690         {
1691           vlib_buffer_t * p0, * p1;
1692           ip6_header_t * ip0, * ip1;
1693           udp_header_t * udp0, * udp1;
1694           u32 pi0, ip_len0, udp_len0, flags0, next0;
1695           u32 pi1, ip_len1, udp_len1, flags1, next1;
1696           i32 len_diff0, len_diff1;
1697           u8 error0, type0, good_l4_checksum0;
1698           u8 error1, type1, good_l4_checksum1;
1699
1700           pi0 = to_next[0] = from[0];
1701           pi1 = to_next[1] = from[1];
1702           from += 2;
1703           n_left_from -= 2;
1704           to_next += 2;
1705           n_left_to_next -= 2;
1706
1707           p0 = vlib_get_buffer (vm, pi0);
1708           p1 = vlib_get_buffer (vm, pi1);
1709
1710           ip0 = vlib_buffer_get_current (p0);
1711           ip1 = vlib_buffer_get_current (p1);
1712
1713           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1714           type1 = lm->builtin_protocol_by_ip_protocol[ip1->protocol];
1715
1716           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1717           next1 = lm->local_next_by_ip_protocol[ip1->protocol];
1718
1719           flags0 = p0->flags;
1720           flags1 = p1->flags;
1721
1722           good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1723           good_l4_checksum1 = (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1724
1725           udp0 = ip6_next_header (ip0);
1726           udp1 = ip6_next_header (ip1);
1727
1728           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1729           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0;
1730           good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UDP && udp1->checksum == 0;
1731
1732           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1733           good_l4_checksum1 |= type1 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1734
1735           /* Verify UDP length. */
1736           ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1737           ip_len1 = clib_net_to_host_u16 (ip1->payload_length);
1738           udp_len0 = clib_net_to_host_u16 (udp0->length);
1739           udp_len1 = clib_net_to_host_u16 (udp1->length);
1740
1741           len_diff0 = ip_len0 - udp_len0;
1742           len_diff1 = ip_len1 - udp_len1;
1743
1744           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1745           len_diff1 = type1 == IP_BUILTIN_PROTOCOL_UDP ? len_diff1 : 0;
1746
1747           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1748                              && ! good_l4_checksum0
1749                              && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1750             {
1751               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1752               good_l4_checksum0 =
1753                 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1754             }
1755           if (PREDICT_FALSE (type1 != IP_BUILTIN_PROTOCOL_UNKNOWN
1756                              && ! good_l4_checksum1
1757                              && ! (flags1 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1758             {
1759               flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, p1);
1760               good_l4_checksum1 =
1761                 (flags1 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1762             }
1763
1764           error0 = error1 = IP6_ERROR_UNKNOWN_PROTOCOL;
1765
1766           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1767           error1 = len_diff1 < 0 ? IP6_ERROR_UDP_LENGTH : error1;
1768
1769           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM);
1770           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM);
1771           error0 = (! good_l4_checksum0
1772                     ? IP6_ERROR_UDP_CHECKSUM + type0
1773                     : error0);
1774           error1 = (! good_l4_checksum1
1775                     ? IP6_ERROR_UDP_CHECKSUM + type1
1776                     : error1);
1777
1778           /* Drop packets from unroutable hosts. */
1779           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1780           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL && type0 != IP_BUILTIN_PROTOCOL_ICMP)
1781             {
1782               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1783               error0 = (lm->miss_adj_index == src_adj_index0
1784                         ? IP6_ERROR_SRC_LOOKUP_MISS
1785                         : error0);
1786             }
1787           if (error1 == IP6_ERROR_UNKNOWN_PROTOCOL && type1 != IP_BUILTIN_PROTOCOL_ICMP)
1788             {
1789               u32 src_adj_index1 = ip6_src_lookup_for_packet (im, p1, ip1);
1790               error1 = (lm->miss_adj_index == src_adj_index1
1791                         ? IP6_ERROR_SRC_LOOKUP_MISS
1792                         : error1);
1793             }
1794
1795           next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1796           next1 = error1 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next1;
1797
1798           p0->error = error_node->errors[error0];
1799           p1->error = error_node->errors[error1];
1800
1801           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
1802                                            to_next, n_left_to_next,
1803                                            pi0, pi1, next0, next1);
1804         }
1805
1806       while (n_left_from > 0 && n_left_to_next > 0)
1807         {
1808           vlib_buffer_t * p0;
1809           ip6_header_t * ip0;
1810           udp_header_t * udp0;
1811           u32 pi0, ip_len0, udp_len0, flags0, next0;
1812           i32 len_diff0;
1813           u8 error0, type0, good_l4_checksum0;
1814
1815           pi0 = to_next[0] = from[0];
1816           from += 1;
1817           n_left_from -= 1;
1818           to_next += 1;
1819           n_left_to_next -= 1;
1820
1821           p0 = vlib_get_buffer (vm, pi0);
1822
1823           ip0 = vlib_buffer_get_current (p0);
1824
1825           type0 = lm->builtin_protocol_by_ip_protocol[ip0->protocol];
1826           next0 = lm->local_next_by_ip_protocol[ip0->protocol];
1827
1828           flags0 = p0->flags;
1829
1830           good_l4_checksum0 = (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1831
1832           udp0 = ip6_next_header (ip0);
1833
1834           /* Don't verify UDP checksum for packets with explicit zero checksum. */
1835           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UDP && udp0->checksum == 0;
1836
1837           good_l4_checksum0 |= type0 == IP_BUILTIN_PROTOCOL_UNKNOWN;
1838
1839           /* Verify UDP length. */
1840           ip_len0 = clib_net_to_host_u16 (ip0->payload_length);
1841           udp_len0 = clib_net_to_host_u16 (udp0->length);
1842
1843           len_diff0 = ip_len0 - udp_len0;
1844
1845           len_diff0 = type0 == IP_BUILTIN_PROTOCOL_UDP ? len_diff0 : 0;
1846
1847           if (PREDICT_FALSE (type0 != IP_BUILTIN_PROTOCOL_UNKNOWN
1848                              && ! good_l4_checksum0
1849                              && ! (flags0 & IP_BUFFER_L4_CHECKSUM_COMPUTED)))
1850             {
1851               flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, p0);
1852               good_l4_checksum0 =
1853                 (flags0 & IP_BUFFER_L4_CHECKSUM_CORRECT) != 0;
1854             }
1855
1856           error0 = IP6_ERROR_UNKNOWN_PROTOCOL;
1857
1858           error0 = len_diff0 < 0 ? IP6_ERROR_UDP_LENGTH : error0;
1859
1860           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_UDP == IP6_ERROR_UDP_CHECKSUM);
1861           ASSERT (IP6_ERROR_UDP_CHECKSUM + IP_BUILTIN_PROTOCOL_ICMP == IP6_ERROR_ICMP_CHECKSUM);
1862           error0 = (! good_l4_checksum0
1863                     ? IP6_ERROR_UDP_CHECKSUM + type0
1864                     : error0);
1865
1866           /* If this is a neighbor solicitation (ICMP), skip source RPF check */
1867           if (error0 == IP6_ERROR_UNKNOWN_PROTOCOL && type0 != IP_BUILTIN_PROTOCOL_ICMP)
1868             {
1869               u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
1870               error0 = (lm->miss_adj_index == src_adj_index0
1871                         ? IP6_ERROR_SRC_LOOKUP_MISS
1872                         : error0);
1873             }
1874
1875           next0 = error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
1876
1877           p0->error = error_node->errors[error0];
1878
1879           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
1880                                            to_next, n_left_to_next,
1881                                            pi0, next0);
1882         }
1883
1884       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1885     }
1886
1887   return frame->n_vectors;
1888 }
1889
1890 VLIB_REGISTER_NODE (ip6_local_node,static) = {
1891   .function = ip6_local,
1892   .name = "ip6-local",
1893   .vector_size = sizeof (u32),
1894
1895   .format_trace = format_ip6_forward_next_trace,
1896
1897   .n_next_nodes = IP_LOCAL_N_NEXT,
1898   .next_nodes = {
1899     [IP_LOCAL_NEXT_DROP] = "error-drop",
1900     [IP_LOCAL_NEXT_PUNT] = "error-punt",
1901     [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
1902     [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
1903   },
1904 };
1905
1906 void ip6_register_protocol (u32 protocol, u32 node_index)
1907 {
1908   vlib_main_t * vm = vlib_get_main();
1909   ip6_main_t * im = &ip6_main;
1910   ip_lookup_main_t * lm = &im->lookup_main;
1911
1912   ASSERT (protocol < ARRAY_LEN (lm->local_next_by_ip_protocol));
1913   lm->local_next_by_ip_protocol[protocol] = vlib_node_add_next (vm, ip6_local_node.index, node_index);
1914 }
1915
1916 typedef enum {
1917   IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1918   IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX,
1919   IP6_DISCOVER_NEIGHBOR_N_NEXT,
1920 } ip6_discover_neighbor_next_t;
1921
1922 typedef enum {
1923   IP6_DISCOVER_NEIGHBOR_ERROR_DROP,
1924   IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT,
1925 } ip6_discover_neighbor_error_t;
1926
1927 static uword
1928 ip6_discover_neighbor (vlib_main_t * vm,
1929                        vlib_node_runtime_t * node,
1930                        vlib_frame_t * frame)
1931 {
1932   vnet_main_t * vnm = vnet_get_main();
1933   ip6_main_t * im = &ip6_main;
1934   ip_lookup_main_t * lm = &im->lookup_main;
1935   u32 * from, * to_next_drop;
1936   uword n_left_from, n_left_to_next_drop;
1937   static f64 time_last_seed_change = -1e100;
1938   static u32 hash_seeds[3];
1939   static uword hash_bitmap[256 / BITS (uword)];
1940   f64 time_now;
1941   int bogus_length;
1942
1943   if (node->flags & VLIB_NODE_FLAG_TRACE)
1944     ip6_forward_next_trace (vm, node, frame, VLIB_TX);
1945
1946   time_now = vlib_time_now (vm);
1947   if (time_now - time_last_seed_change > 1e-3)
1948     {
1949       uword i;
1950       u32 * r = clib_random_buffer_get_data (&vm->random_buffer,
1951                                              sizeof (hash_seeds));
1952       for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
1953         hash_seeds[i] = r[i];
1954
1955       /* Mark all hash keys as been not-seen before. */
1956       for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
1957         hash_bitmap[i] = 0;
1958
1959       time_last_seed_change = time_now;
1960     }
1961
1962   from = vlib_frame_vector_args (frame);
1963   n_left_from = frame->n_vectors;
1964
1965   while (n_left_from > 0)
1966     {
1967       vlib_get_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
1968                            to_next_drop, n_left_to_next_drop);
1969
1970       while (n_left_from > 0 && n_left_to_next_drop > 0)
1971         {
1972           vlib_buffer_t * p0;
1973           ip6_header_t * ip0;
1974           u32 pi0, adj_index0, a0, b0, c0, m0, sw_if_index0, drop0;
1975           uword bm0;
1976           ip_adjacency_t * adj0;
1977           vnet_hw_interface_t * hw_if0;
1978           u32 next0;
1979
1980           pi0 = from[0];
1981
1982           p0 = vlib_get_buffer (vm, pi0);
1983
1984           adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
1985
1986           ip0 = vlib_buffer_get_current (p0);
1987
1988           adj0 = ip_get_adjacency (lm, adj_index0);
1989
1990           if (adj0->arp.next_hop.ip6.as_u64[0] ||
1991               adj0->arp.next_hop.ip6.as_u64[1]) {
1992             ip0->dst_address.as_u64[0] = adj0->arp.next_hop.ip6.as_u64[0];
1993             ip0->dst_address.as_u64[1] = adj0->arp.next_hop.ip6.as_u64[1];
1994           }
1995
1996           a0 = hash_seeds[0];
1997           b0 = hash_seeds[1];
1998           c0 = hash_seeds[2];
1999
2000           sw_if_index0 = adj0->rewrite_header.sw_if_index;
2001           vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index0;
2002
2003           a0 ^= sw_if_index0;
2004           b0 ^= ip0->dst_address.as_u32[0];
2005           c0 ^= ip0->dst_address.as_u32[1];
2006
2007           hash_v3_mix32 (a0, b0, c0);
2008
2009           b0 ^= ip0->dst_address.as_u32[2];
2010           c0 ^= ip0->dst_address.as_u32[3];
2011
2012           hash_v3_finalize32 (a0, b0, c0);
2013
2014           c0 &= BITS (hash_bitmap) - 1;
2015           c0 = c0 / BITS (uword);
2016           m0 = (uword) 1 << (c0 % BITS (uword));
2017
2018           bm0 = hash_bitmap[c0];
2019           drop0 = (bm0 & m0) != 0;
2020
2021           /* Mark it as seen. */
2022           hash_bitmap[c0] = bm0 | m0;
2023
2024           from += 1;
2025           n_left_from -= 1;
2026           to_next_drop[0] = pi0;
2027           to_next_drop += 1;
2028           n_left_to_next_drop -= 1;
2029
2030           hw_if0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
2031
2032           /* If the interface is link-down, drop the pkt */
2033           if (!(hw_if0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))
2034             drop0 = 1;
2035
2036           p0->error =
2037             node->errors[drop0 ? IP6_DISCOVER_NEIGHBOR_ERROR_DROP
2038                          : IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT];
2039           if (drop0)
2040             continue;
2041
2042           {
2043             u32 bi0 = 0;
2044             icmp6_neighbor_solicitation_header_t * h0;
2045             vlib_buffer_t * b0;
2046
2047             h0 = vlib_packet_template_get_packet
2048               (vm, &im->discover_neighbor_packet_template, &bi0);
2049
2050             /*
2051              * Build ethernet header.
2052              * Choose source address based on destination lookup
2053              * adjacency.
2054              */
2055             ip6_src_address_for_packet (im, p0, &h0->ip.src_address,
2056                                         sw_if_index0);
2057
2058             /*
2059              * Destination address is a solicited node multicast address.
2060              * We need to fill in
2061              * the low 24 bits with low 24 bits of target's address.
2062              */
2063             h0->ip.dst_address.as_u8[13] = ip0->dst_address.as_u8[13];
2064             h0->ip.dst_address.as_u8[14] = ip0->dst_address.as_u8[14];
2065             h0->ip.dst_address.as_u8[15] = ip0->dst_address.as_u8[15];
2066
2067             h0->neighbor.target_address = ip0->dst_address;
2068
2069             clib_memcpy (h0->link_layer_option.ethernet_address,
2070                     hw_if0->hw_address, vec_len (hw_if0->hw_address));
2071
2072             /* $$$$ appears we need this; why is the checksum non-zero? */
2073             h0->neighbor.icmp.checksum = 0;
2074             h0->neighbor.icmp.checksum =
2075               ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h0->ip,
2076                                                  &bogus_length);
2077
2078             ASSERT (bogus_length == 0);
2079
2080             vlib_buffer_copy_trace_flag (vm, p0, bi0);
2081             b0 = vlib_get_buffer (vm, bi0);
2082             vnet_buffer (b0)->sw_if_index[VLIB_TX]
2083               = vnet_buffer (p0)->sw_if_index[VLIB_TX];
2084
2085             /* Add rewrite/encap string. */
2086             vnet_rewrite_one_header (adj0[0], h0,
2087                                      sizeof (ethernet_header_t));
2088             vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
2089
2090             next0 = IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX;
2091
2092             vlib_set_next_frame_buffer (vm, node, next0, bi0);
2093           }
2094         }
2095
2096       vlib_put_next_frame (vm, node, IP6_DISCOVER_NEIGHBOR_NEXT_DROP,
2097                            n_left_to_next_drop);
2098     }
2099
2100   return frame->n_vectors;
2101 }
2102
2103 static char * ip6_discover_neighbor_error_strings[] = {
2104   [IP6_DISCOVER_NEIGHBOR_ERROR_DROP] = "address overflow drops",
2105   [IP6_DISCOVER_NEIGHBOR_ERROR_REQUEST_SENT]
2106   = "neighbor solicitations sent",
2107 };
2108
2109 VLIB_REGISTER_NODE (ip6_discover_neighbor_node) = {
2110   .function = ip6_discover_neighbor,
2111   .name = "ip6-discover-neighbor",
2112   .vector_size = sizeof (u32),
2113
2114   .format_trace = format_ip6_forward_next_trace,
2115
2116   .n_errors = ARRAY_LEN (ip6_discover_neighbor_error_strings),
2117   .error_strings = ip6_discover_neighbor_error_strings,
2118
2119   .n_next_nodes = IP6_DISCOVER_NEIGHBOR_N_NEXT,
2120   .next_nodes = {
2121     [IP6_DISCOVER_NEIGHBOR_NEXT_DROP] = "error-drop",
2122     [IP6_DISCOVER_NEIGHBOR_NEXT_REPLY_TX] = "interface-output",
2123   },
2124 };
2125
2126 clib_error_t *
2127 ip6_probe_neighbor (vlib_main_t * vm, ip6_address_t * dst, u32 sw_if_index)
2128 {
2129   vnet_main_t * vnm = vnet_get_main();
2130   ip6_main_t * im = &ip6_main;
2131   icmp6_neighbor_solicitation_header_t * h;
2132   ip6_address_t * src;
2133   ip_interface_address_t * ia;
2134   ip_adjacency_t * adj;
2135   vnet_hw_interface_t * hi;
2136   vnet_sw_interface_t * si;
2137   vlib_buffer_t * b;
2138   u32 bi = 0;
2139   int bogus_length;
2140
2141   si = vnet_get_sw_interface (vnm, sw_if_index);
2142
2143   if (!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))
2144     {
2145       return clib_error_return (0, "%U: interface %U down",
2146                                 format_ip6_address, dst,
2147                                 format_vnet_sw_if_index_name, vnm,
2148                                 sw_if_index);
2149     }
2150
2151   src = ip6_interface_address_matching_destination (im, dst, sw_if_index, &ia);
2152   if (! src)
2153     {
2154       vnm->api_errno = VNET_API_ERROR_NO_MATCHING_INTERFACE;
2155       return clib_error_return
2156         (0, "no matching interface address for destination %U (interface %U)",
2157          format_ip6_address, dst,
2158          format_vnet_sw_if_index_name, vnm, sw_if_index);
2159     }
2160
2161   h = vlib_packet_template_get_packet (vm, &im->discover_neighbor_packet_template, &bi);
2162
2163   hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
2164
2165   /* Destination address is a solicited node multicast address.  We need to fill in
2166      the low 24 bits with low 24 bits of target's address. */
2167   h->ip.dst_address.as_u8[13] = dst->as_u8[13];
2168   h->ip.dst_address.as_u8[14] = dst->as_u8[14];
2169   h->ip.dst_address.as_u8[15] = dst->as_u8[15];
2170
2171   h->ip.src_address = src[0];
2172   h->neighbor.target_address = dst[0];
2173
2174   clib_memcpy (h->link_layer_option.ethernet_address, hi->hw_address, vec_len (hi->hw_address));
2175
2176   h->neighbor.icmp.checksum =
2177     ip6_tcp_udp_icmp_compute_checksum (vm, 0, &h->ip, &bogus_length);
2178   ASSERT(bogus_length == 0);
2179
2180   b = vlib_get_buffer (vm, bi);
2181   vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
2182
2183   /* Add encapsulation string for software interface (e.g. ethernet header). */
2184   adj = ip_get_adjacency (&im->lookup_main, ia->neighbor_probe_adj_index);
2185   vnet_rewrite_one_header (adj[0], h, sizeof (ethernet_header_t));
2186   vlib_buffer_advance (b, -adj->rewrite_header.data_bytes);
2187
2188   {
2189     vlib_frame_t * f = vlib_get_frame_to_node (vm, hi->output_node_index);
2190     u32 * to_next = vlib_frame_vector_args (f);
2191     to_next[0] = bi;
2192     f->n_vectors = 1;
2193     vlib_put_frame_to_node (vm, hi->output_node_index, f);
2194   }
2195
2196   return /* no error */ 0;
2197 }
2198
2199 typedef enum {
2200   IP6_REWRITE_NEXT_DROP,
2201 } ip6_rewrite_next_t;
2202
2203 always_inline uword
2204 ip6_rewrite_inline (vlib_main_t * vm,
2205                     vlib_node_runtime_t * node,
2206                     vlib_frame_t * frame,
2207                     int rewrite_for_locally_received_packets)
2208 {
2209   ip_lookup_main_t * lm = &ip6_main.lookup_main;
2210   u32 * from = vlib_frame_vector_args (frame);
2211   u32 n_left_from, n_left_to_next, * to_next, next_index;
2212   vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip6_input_node.index);
2213   vlib_rx_or_tx_t adj_rx_tx = rewrite_for_locally_received_packets ? VLIB_RX : VLIB_TX;
2214
2215   n_left_from = frame->n_vectors;
2216   next_index = node->cached_next_index;
2217   u32 cpu_index = os_get_cpu_number();
2218
2219   while (n_left_from > 0)
2220     {
2221       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
2222
2223       while (n_left_from >= 4 && n_left_to_next >= 2)
2224         {
2225           ip_adjacency_t * adj0, * adj1;
2226           vlib_buffer_t * p0, * p1;
2227           ip6_header_t * ip0, * ip1;
2228           u32 pi0, rw_len0, next0, error0, adj_index0;
2229           u32 pi1, rw_len1, next1, error1, adj_index1;
2230
2231           /* Prefetch next iteration. */
2232           {
2233             vlib_buffer_t * p2, * p3;
2234
2235             p2 = vlib_get_buffer (vm, from[2]);
2236             p3 = vlib_get_buffer (vm, from[3]);
2237
2238             vlib_prefetch_buffer_header (p2, LOAD);
2239             vlib_prefetch_buffer_header (p3, LOAD);
2240
2241             CLIB_PREFETCH (p2->pre_data, 32, STORE);
2242             CLIB_PREFETCH (p3->pre_data, 32, STORE);
2243
2244             CLIB_PREFETCH (p2->data, sizeof (ip0[0]), STORE);
2245             CLIB_PREFETCH (p3->data, sizeof (ip0[0]), STORE);
2246           }
2247
2248           pi0 = to_next[0] = from[0];
2249           pi1 = to_next[1] = from[1];
2250
2251           from += 2;
2252           n_left_from -= 2;
2253           to_next += 2;
2254           n_left_to_next -= 2;
2255
2256           p0 = vlib_get_buffer (vm, pi0);
2257           p1 = vlib_get_buffer (vm, pi1);
2258
2259           adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
2260           adj_index1 = vnet_buffer (p1)->ip.adj_index[adj_rx_tx];
2261
2262           /* We should never rewrite a pkt using the MISS adjacency */
2263           ASSERT(adj_index0 && adj_index1);
2264
2265           ip0 = vlib_buffer_get_current (p0);
2266           ip1 = vlib_buffer_get_current (p1);
2267
2268           error0 = error1 = IP6_ERROR_NONE;
2269
2270           if (! rewrite_for_locally_received_packets)
2271             {
2272               i32 hop_limit0 = ip0->hop_limit, hop_limit1 = ip1->hop_limit;
2273
2274               /* Input node should have reject packets with hop limit 0. */
2275               ASSERT (ip0->hop_limit > 0);
2276               ASSERT (ip1->hop_limit > 0);
2277
2278               hop_limit0 -= 1;
2279               hop_limit1 -= 1;
2280
2281               ip0->hop_limit = hop_limit0;
2282               ip1->hop_limit = hop_limit1;
2283
2284               error0 = hop_limit0 <= 0 ? IP6_ERROR_TIME_EXPIRED : error0;
2285               error1 = hop_limit1 <= 0 ? IP6_ERROR_TIME_EXPIRED : error1;
2286             }
2287
2288           adj0 = ip_get_adjacency (lm, adj_index0);
2289           adj1 = ip_get_adjacency (lm, adj_index1);
2290
2291           if (rewrite_for_locally_received_packets)
2292             {
2293               /*
2294                * If someone sends e.g. an icmp6 w/ src = dst = interface addr,
2295                * we end up here with a local adjacency in hand
2296                */
2297               if (PREDICT_FALSE(adj0->lookup_next_index
2298                                 == IP_LOOKUP_NEXT_LOCAL))
2299                 error0 = IP6_ERROR_SPOOFED_LOCAL_PACKETS;
2300               if (PREDICT_FALSE(adj1->lookup_next_index
2301                                 == IP_LOOKUP_NEXT_LOCAL))
2302                 error1 = IP6_ERROR_SPOOFED_LOCAL_PACKETS;
2303             }
2304
2305           rw_len0 = adj0[0].rewrite_header.data_bytes;
2306           rw_len1 = adj1[0].rewrite_header.data_bytes;
2307
2308           vlib_increment_combined_counter (&lm->adjacency_counters,
2309                                            cpu_index,
2310                                            adj_index0,
2311                                            /* packet increment */ 0,
2312                                            /* byte increment */ rw_len0);
2313           vlib_increment_combined_counter (&lm->adjacency_counters,
2314                                            cpu_index,
2315                                            adj_index1,
2316                                            /* packet increment */ 0,
2317                                            /* byte increment */ rw_len1);
2318
2319           /* Check MTU of outgoing interface. */
2320           error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
2321                     ? IP6_ERROR_MTU_EXCEEDED
2322                     : error0);
2323           error1 = (vlib_buffer_length_in_chain (vm, p1) > adj1[0].rewrite_header.max_l3_packet_bytes
2324                     ? IP6_ERROR_MTU_EXCEEDED
2325                     : error1);
2326
2327           p0->current_data -= rw_len0;
2328           p1->current_data -= rw_len1;
2329
2330           p0->current_length += rw_len0;
2331           p1->current_length += rw_len1;
2332
2333           vnet_buffer (p0)->sw_if_index[VLIB_TX] = adj0[0].rewrite_header.sw_if_index;
2334           vnet_buffer (p1)->sw_if_index[VLIB_TX] = adj1[0].rewrite_header.sw_if_index;
2335
2336           next0 = (error0 == IP6_ERROR_NONE) ?
2337             adj0[0].rewrite_header.next_index : IP6_REWRITE_NEXT_DROP;
2338           next1 = (error1 == IP6_ERROR_NONE) ?
2339             adj1[0].rewrite_header.next_index : IP6_REWRITE_NEXT_DROP;
2340
2341           /* Guess we are only writing on simple Ethernet header. */
2342           vnet_rewrite_two_headers (adj0[0], adj1[0],
2343                                     ip0, ip1,
2344                                     sizeof (ethernet_header_t));
2345
2346           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
2347                                            to_next, n_left_to_next,
2348                                            pi0, pi1, next0, next1);
2349         }
2350
2351       while (n_left_from > 0 && n_left_to_next > 0)
2352         {
2353           ip_adjacency_t * adj0;
2354           vlib_buffer_t * p0;
2355           ip6_header_t * ip0;
2356           u32 pi0, rw_len0;
2357           u32 adj_index0, next0, error0;
2358
2359           pi0 = to_next[0] = from[0];
2360
2361           p0 = vlib_get_buffer (vm, pi0);
2362
2363           adj_index0 = vnet_buffer (p0)->ip.adj_index[adj_rx_tx];
2364
2365           /* We should never rewrite a pkt using the MISS adjacency */
2366           ASSERT(adj_index0);
2367
2368           adj0 = ip_get_adjacency (lm, adj_index0);
2369
2370           ip0 = vlib_buffer_get_current (p0);
2371
2372           error0 = IP6_ERROR_NONE;
2373
2374           /* Check hop limit */
2375           if (! rewrite_for_locally_received_packets)
2376             {
2377               i32 hop_limit0 = ip0->hop_limit;
2378
2379               ASSERT (ip0->hop_limit > 0);
2380
2381               hop_limit0 -= 1;
2382
2383               ip0->hop_limit = hop_limit0;
2384
2385               error0 = hop_limit0 <= 0 ? IP6_ERROR_TIME_EXPIRED : error0;
2386             }
2387
2388           if (rewrite_for_locally_received_packets)
2389             {
2390               if (PREDICT_FALSE(adj0->lookup_next_index
2391                                 == IP_LOOKUP_NEXT_LOCAL))
2392                 error0 = IP6_ERROR_SPOOFED_LOCAL_PACKETS;
2393             }
2394
2395           /* Guess we are only writing on simple Ethernet header. */
2396           vnet_rewrite_one_header (adj0[0], ip0, sizeof (ethernet_header_t));
2397
2398           /* Update packet buffer attributes/set output interface. */
2399           rw_len0 = adj0[0].rewrite_header.data_bytes;
2400
2401           vlib_increment_combined_counter (&lm->adjacency_counters,
2402                                            cpu_index,
2403                                            adj_index0,
2404                                            /* packet increment */ 0,
2405                                            /* byte increment */ rw_len0);
2406
2407           /* Check MTU of outgoing interface. */
2408           error0 = (vlib_buffer_length_in_chain (vm, p0) > adj0[0].rewrite_header.max_l3_packet_bytes
2409                     ? IP6_ERROR_MTU_EXCEEDED
2410                     : error0);
2411
2412           p0->current_data -= rw_len0;
2413           p0->current_length += rw_len0;
2414           vnet_buffer (p0)->sw_if_index[VLIB_TX] = adj0[0].rewrite_header.sw_if_index;
2415
2416           next0 = (error0 == IP6_ERROR_NONE) ?
2417             adj0[0].rewrite_header.next_index : IP6_REWRITE_NEXT_DROP;
2418
2419           p0->error = error_node->errors[error0];
2420
2421           from += 1;
2422           n_left_from -= 1;
2423           to_next += 1;
2424           n_left_to_next -= 1;
2425
2426           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
2427                                            to_next, n_left_to_next,
2428                                            pi0, next0);
2429         }
2430
2431       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
2432     }
2433
2434   /* Need to do trace after rewrites to pick up new packet data. */
2435   if (node->flags & VLIB_NODE_FLAG_TRACE)
2436     ip6_forward_next_trace (vm, node, frame, adj_rx_tx);
2437
2438   return frame->n_vectors;
2439 }
2440
2441 static uword
2442 ip6_rewrite_transit (vlib_main_t * vm,
2443                      vlib_node_runtime_t * node,
2444                      vlib_frame_t * frame)
2445 {
2446   return ip6_rewrite_inline (vm, node, frame,
2447                              /* rewrite_for_locally_received_packets */ 0);
2448 }
2449
2450 static uword
2451 ip6_rewrite_local (vlib_main_t * vm,
2452                    vlib_node_runtime_t * node,
2453                    vlib_frame_t * frame)
2454 {
2455   return ip6_rewrite_inline (vm, node, frame,
2456                              /* rewrite_for_locally_received_packets */ 1);
2457 }
2458
2459 VLIB_REGISTER_NODE (ip6_rewrite_node) = {
2460   .function = ip6_rewrite_transit,
2461   .name = "ip6-rewrite",
2462   .vector_size = sizeof (u32),
2463
2464   .format_trace = format_ip6_rewrite_trace,
2465
2466   .n_next_nodes = 1,
2467   .next_nodes = {
2468     [IP6_REWRITE_NEXT_DROP] = "error-drop",
2469   },
2470 };
2471
2472 VLIB_REGISTER_NODE (ip6_rewrite_local_node) = {
2473   .function = ip6_rewrite_local,
2474   .name = "ip6-rewrite-local",
2475   .vector_size = sizeof (u32),
2476
2477   .sibling_of = "ip6-rewrite",
2478
2479   .format_trace = format_ip6_rewrite_trace,
2480
2481   .n_next_nodes = 1,
2482   .next_nodes = {
2483     [IP6_REWRITE_NEXT_DROP] = "error-drop",
2484   },
2485 };
2486
2487 /* Global IP6 main. */
2488 ip6_main_t ip6_main;
2489
2490 static clib_error_t *
2491 ip6_lookup_init (vlib_main_t * vm)
2492 {
2493   ip6_main_t * im = &ip6_main;
2494   uword i;
2495
2496   for (i = 0; i < ARRAY_LEN (im->fib_masks); i++)
2497     {
2498       u32 j, i0, i1;
2499
2500       i0 = i / 32;
2501       i1 = i % 32;
2502
2503       for (j = 0; j < i0; j++)
2504         im->fib_masks[i].as_u32[j] = ~0;
2505
2506       if (i1)
2507         im->fib_masks[i].as_u32[i0] = clib_host_to_net_u32 (pow2_mask (i1) << (32 - i1));
2508     }
2509
2510   ip_lookup_init (&im->lookup_main, /* is_ip6 */ 1);
2511
2512   if (im->lookup_table_nbuckets == 0)
2513     im->lookup_table_nbuckets = IP6_FIB_DEFAULT_HASH_NUM_BUCKETS;
2514
2515   im->lookup_table_nbuckets = 1<< max_log2 (im->lookup_table_nbuckets);
2516
2517   if (im->lookup_table_size == 0)
2518     im->lookup_table_size = IP6_FIB_DEFAULT_HASH_MEMORY_SIZE;
2519
2520   BV(clib_bihash_init) (&im->ip6_lookup_table, "ip6 lookup table",
2521                         im->lookup_table_nbuckets,
2522                         im->lookup_table_size);
2523
2524   /* Create FIB with index 0 and table id of 0. */
2525   find_ip6_fib_by_table_index_or_id (im, /* table id */ 0, IP6_ROUTE_FLAG_TABLE_ID);
2526
2527   {
2528     pg_node_t * pn;
2529     pn = pg_get_node (ip6_lookup_node.index);
2530     pn->unformat_edit = unformat_pg_ip6_header;
2531   }
2532
2533   {
2534     icmp6_neighbor_solicitation_header_t p;
2535
2536     memset (&p, 0, sizeof (p));
2537
2538     p.ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
2539     p.ip.payload_length = clib_host_to_net_u16 (sizeof (p)
2540                                                 - STRUCT_OFFSET_OF (icmp6_neighbor_solicitation_header_t, neighbor));
2541     p.ip.protocol = IP_PROTOCOL_ICMP6;
2542     p.ip.hop_limit = 255;
2543     ip6_set_solicited_node_multicast_address (&p.ip.dst_address, 0);
2544
2545     p.neighbor.icmp.type = ICMP6_neighbor_solicitation;
2546
2547     p.link_layer_option.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
2548     p.link_layer_option.header.n_data_u64s = sizeof (p.link_layer_option) / sizeof (u64);
2549
2550     vlib_packet_template_init (vm,
2551                                &im->discover_neighbor_packet_template,
2552                                &p, sizeof (p),
2553                                /* alloc chunk size */ 8,
2554                                "ip6 neighbor discovery");
2555   }
2556
2557   return 0;
2558 }
2559
2560 VLIB_INIT_FUNCTION (ip6_lookup_init);
2561
2562 static clib_error_t *
2563 add_del_ip6_interface_table (vlib_main_t * vm,
2564                              unformat_input_t * input,
2565                              vlib_cli_command_t * cmd)
2566 {
2567   vnet_main_t * vnm = vnet_get_main();
2568   clib_error_t * error = 0;
2569   u32 sw_if_index, table_id;
2570
2571   sw_if_index = ~0;
2572
2573   if (! unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
2574     {
2575       error = clib_error_return (0, "unknown interface `%U'",
2576                                  format_unformat_error, input);
2577       goto done;
2578     }
2579
2580   if (unformat (input, "%d", &table_id))
2581     ;
2582   else
2583     {
2584       error = clib_error_return (0, "expected table id `%U'",
2585                                  format_unformat_error, input);
2586       goto done;
2587     }
2588
2589   {
2590     ip6_main_t * im = &ip6_main;
2591     ip6_fib_t * fib =
2592       find_ip6_fib_by_table_index_or_id (im, table_id, IP6_ROUTE_FLAG_TABLE_ID);
2593
2594     if (fib)
2595       {
2596         vec_validate (im->fib_index_by_sw_if_index, sw_if_index);
2597         im->fib_index_by_sw_if_index[sw_if_index] = fib->index;
2598     }
2599   }
2600
2601  done:
2602   return error;
2603 }
2604
2605 VLIB_CLI_COMMAND (set_interface_ip_table_command, static) = {
2606   .path = "set interface ip6 table",
2607   .function = add_del_ip6_interface_table,
2608   .short_help = "set interface ip6 table <intfc> <table-id>"
2609 };
2610
2611 void
2612 ip6_link_local_address_from_ethernet_mac_address (ip6_address_t *ip,
2613                                                   u8 *mac)
2614 {
2615   ip->as_u64[0] = clib_host_to_net_u64 (0xFE80000000000000ULL);
2616   /* Invert the "u" bit */
2617   ip->as_u8 [8] = mac[0] ^ (1<<1);
2618   ip->as_u8 [9] = mac[1];
2619   ip->as_u8 [10] = mac[2];
2620   ip->as_u8 [11] = 0xFF;
2621   ip->as_u8 [12] = 0xFE;
2622   ip->as_u8 [13] = mac[3];
2623   ip->as_u8 [14] = mac[4];
2624   ip->as_u8 [15] = mac[5];
2625 }
2626
2627 void
2628 ip6_ethernet_mac_address_from_link_local_address (u8 *mac,
2629                                                   ip6_address_t *ip)
2630 {
2631   /* Invert the previously inverted "u" bit */
2632   mac[0] = ip->as_u8 [8] ^ (1<<1);
2633   mac[1] = ip->as_u8 [9];
2634   mac[2] = ip->as_u8 [10];
2635   mac[3] = ip->as_u8 [13];
2636   mac[4] = ip->as_u8 [14];
2637   mac[5] = ip->as_u8 [15];
2638 }
2639
2640 static clib_error_t *
2641 test_ip6_link_command_fn (vlib_main_t * vm,
2642                           unformat_input_t * input,
2643                           vlib_cli_command_t * cmd)
2644 {
2645   u8 mac[6];
2646   ip6_address_t _a, *a = &_a;
2647
2648   if (unformat (input, "%U", unformat_ethernet_address, mac))
2649     {
2650       ip6_link_local_address_from_ethernet_mac_address (a, mac);
2651       vlib_cli_output (vm, "Link local address: %U",
2652                        format_ip6_address, a);
2653       ip6_ethernet_mac_address_from_link_local_address (mac, a);
2654       vlib_cli_output (vm, "Original MAC address: %U",
2655                        format_ethernet_address, mac);
2656     }
2657
2658   return 0;
2659 }
2660
2661 VLIB_CLI_COMMAND (test_link_command, static) = {
2662   .path = "test ip6 link",
2663   .function = test_ip6_link_command_fn,
2664   .short_help = "test ip6 link <mac-address>",
2665 };
2666
2667 int vnet_set_ip6_flow_hash (u32 table_id, u32 flow_hash_config)
2668 {
2669   ip6_main_t * im6 = &ip6_main;
2670   ip6_fib_t * fib;
2671   uword * p = hash_get (im6->fib_index_by_table_id, table_id);
2672
2673   if (p == 0)
2674     return -1;
2675
2676   fib = vec_elt_at_index (im6->fibs, p[0]);
2677
2678   fib->flow_hash_config = flow_hash_config;
2679   return 1;
2680 }
2681
2682 static clib_error_t *
2683 set_ip6_flow_hash_command_fn (vlib_main_t * vm,
2684                               unformat_input_t * input,
2685                               vlib_cli_command_t * cmd)
2686 {
2687   int matched = 0;
2688   u32 table_id = 0;
2689   u32 flow_hash_config = 0;
2690   int rv;
2691
2692   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
2693     if (unformat (input, "table %d", &table_id))
2694       matched = 1;
2695 #define _(a,v) \
2696     else if (unformat (input, #a)) { flow_hash_config |= v; matched=1;}
2697     foreach_flow_hash_bit
2698 #undef _
2699     else break;
2700   }
2701
2702   if (matched == 0)
2703     return clib_error_return (0, "unknown input `%U'",
2704                               format_unformat_error, input);
2705
2706   rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);
2707   switch (rv)
2708     {
2709     case 1:
2710       break;
2711
2712     case -1:
2713       return clib_error_return (0, "no such FIB table %d", table_id);
2714
2715     default:
2716       clib_warning ("BUG: illegal flow hash config 0x%x", flow_hash_config);
2717       break;
2718     }
2719
2720   return 0;
2721 }
2722
2723 VLIB_CLI_COMMAND (set_ip6_flow_hash_command, static) = {
2724     .path = "set ip6 flow-hash",
2725     .short_help =
2726     "set ip table flow-hash table <fib-id> src dst sport dport proto reverse",
2727     .function = set_ip6_flow_hash_command_fn,
2728 };
2729
2730 static clib_error_t *
2731 show_ip6_local_command_fn (vlib_main_t * vm,
2732                            unformat_input_t * input,
2733                            vlib_cli_command_t * cmd)
2734 {
2735   ip6_main_t * im = &ip6_main;
2736   ip_lookup_main_t * lm = &im->lookup_main;
2737   int i;
2738
2739   vlib_cli_output (vm, "Protocols handled by ip6_local");
2740   for (i = 0; i < ARRAY_LEN(lm->local_next_by_ip_protocol); i++)
2741     {
2742       if (lm->local_next_by_ip_protocol[i] != IP_LOCAL_NEXT_PUNT)
2743         vlib_cli_output (vm, "%d", i);
2744     }
2745   return 0;
2746 }
2747
2748
2749
2750 VLIB_CLI_COMMAND (show_ip_local, static) = {
2751   .path = "show ip6 local",
2752   .function = show_ip6_local_command_fn,
2753   .short_help = "Show ip6 local protocol table",
2754 };
2755
2756 int vnet_set_ip6_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
2757                                  u32 table_index)
2758 {
2759   vnet_main_t * vnm = vnet_get_main();
2760   vnet_interface_main_t * im = &vnm->interface_main;
2761   ip6_main_t * ipm = &ip6_main;
2762   ip_lookup_main_t * lm = &ipm->lookup_main;
2763   vnet_classify_main_t * cm = &vnet_classify_main;
2764
2765   if (pool_is_free_index (im->sw_interfaces, sw_if_index))
2766     return VNET_API_ERROR_NO_MATCHING_INTERFACE;
2767
2768   if (table_index != ~0 && pool_is_free_index (cm->tables, table_index))
2769     return VNET_API_ERROR_NO_SUCH_ENTRY;
2770
2771   vec_validate (lm->classify_table_index_by_sw_if_index, sw_if_index);
2772   lm->classify_table_index_by_sw_if_index [sw_if_index] = table_index;
2773
2774   return 0;
2775 }
2776
2777 static clib_error_t *
2778 set_ip6_classify_command_fn (vlib_main_t * vm,
2779                              unformat_input_t * input,
2780                              vlib_cli_command_t * cmd)
2781 {
2782   u32 table_index = ~0;
2783   int table_index_set = 0;
2784   u32 sw_if_index = ~0;
2785   int rv;
2786
2787   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
2788     if (unformat (input, "table-index %d", &table_index))
2789       table_index_set = 1;
2790     else if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
2791                        vnet_get_main(), &sw_if_index))
2792         ;
2793     else
2794         break;
2795   }
2796
2797   if (table_index_set == 0)
2798       return clib_error_return (0, "classify table-index must be specified");
2799
2800   if (sw_if_index == ~0)
2801     return clib_error_return (0, "interface / subif must be specified");
2802
2803   rv = vnet_set_ip6_classify_intfc (vm, sw_if_index, table_index);
2804
2805   switch (rv)
2806     {
2807     case 0:
2808       break;
2809
2810     case VNET_API_ERROR_NO_MATCHING_INTERFACE:
2811       return clib_error_return (0, "No such interface");
2812
2813     case VNET_API_ERROR_NO_SUCH_ENTRY:
2814       return clib_error_return (0, "No such classifier table");
2815     }
2816   return 0;
2817 }
2818
2819 VLIB_CLI_COMMAND (set_ip6_classify_command, static) = {
2820     .path = "set ip6 classify",
2821     .short_help =
2822     "set ip6 classify intfc <int> table-index <index>",
2823     .function = set_ip6_classify_command_fn,
2824 };
2825
2826 static clib_error_t *
2827 ip6_config (vlib_main_t * vm, unformat_input_t * input)
2828 {
2829   ip6_main_t * im = &ip6_main;
2830   uword heapsize = 0;
2831   u32 tmp;
2832   u32 nbuckets = 0;
2833
2834   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) {
2835     if (unformat (input, "hash-buckets %d", &tmp))
2836       nbuckets = tmp;
2837     else if (unformat (input, "heap-size %dm", &tmp))
2838       heapsize = ((u64)tmp) << 20;
2839     else if (unformat (input, "heap-size %dM", &tmp))
2840       heapsize = ((u64)tmp) << 20;
2841     else if (unformat (input, "heap-size %dg", &tmp))
2842       heapsize = ((u64)tmp) << 30;
2843     else if (unformat (input, "heap-size %dG", &tmp))
2844       heapsize = ((u64)tmp) << 30;
2845     else
2846       return clib_error_return (0, "unknown input '%U'",
2847                                 format_unformat_error, input);
2848   }
2849
2850   im->lookup_table_nbuckets = nbuckets;
2851   im->lookup_table_size = heapsize;
2852
2853   return 0;
2854 }
2855
2856 VLIB_EARLY_CONFIG_FUNCTION (ip6_config, "ip6");
2857