vnet/vnet/gre/node.c

   1 /*
   2  * node.c: gre packet processing
   3  *
   4  * Copyright (c) 2012 Cisco and/or its affiliates.
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at:
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <vlib/vlib.h>
  19 #include <vnet/pg/pg.h>
  20 #include <vnet/gre/gre.h>
  21 #include <vppinfra/sparse_vec.h>
  22
  23 #define foreach_gre_input_next                  \
  24 _(PUNT, "error-punt")                           \
  25 _(DROP, "error-drop")                           \
  26 _(ETHERNET_INPUT, "ethernet-input")             \
  27 _(IP4_INPUT, "ip4-input")                       \
  28 _(IP6_INPUT, "ip6-input")
  29
  30 typedef enum {
  31 #define _(s,n) GRE_INPUT_NEXT_##s,
  32   foreach_gre_input_next
  33 #undef _
  34   GRE_INPUT_N_NEXT,
  35 } gre_input_next_t;
  36
  37 typedef struct {
  38   u32 tunnel_id;
  39   u32 length;
  40   ip4_address_t src;
  41   ip4_address_t dst;
  42 } gre_rx_trace_t;
  43
  44 u8 * format_gre_rx_trace (u8 * s, va_list * args)
  45 {
  46   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  47   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  48   gre_rx_trace_t * t = va_arg (*args, gre_rx_trace_t *);
  49
  50   s = format (s, "GRE: tunnel %d len %d src %U dst %U",
  51               t->tunnel_id, clib_net_to_host_u16(t->length),
  52               format_ip4_address, &t->src.as_u8,
  53               format_ip4_address, &t->dst.as_u8);
  54   return s;
  55 }
  56
  57 typedef struct {
  58   /* Sparse vector mapping gre protocol in network byte order
  59      to next index. */
  60   u16 * next_by_protocol;
  61 } gre_input_runtime_t;
  62
  63 static uword
  64 gre_input (vlib_main_t * vm,
  65            vlib_node_runtime_t * node,
  66            vlib_frame_t * from_frame)
  67 {
  68   gre_main_t * gm = &gre_main;
  69   gre_input_runtime_t * rt = (void *) node->runtime_data;
  70   __attribute__((unused)) u32 n_left_from, next_index, * from, * to_next;
  71   u64 cached_tunnel_key = (u64) ~0;
  72   u32 cached_tunnel_sw_if_index = 0, tunnel_sw_if_index;
  73   u32 cached_tunnel_fib_index = 0, tunnel_fib_index;
  74
  75   u32 cpu_index = os_get_cpu_number();
  76
  77   from = vlib_frame_vector_args (from_frame);
  78   n_left_from = from_frame->n_vectors;
  79
  80   next_index = node->cached_next_index;
  81
  82   while (n_left_from > 0)
  83     {
  84       u32 n_left_to_next;
  85
  86       vlib_get_next_frame (vm, node, next_index,
  87                            to_next, n_left_to_next);
  88
  89       while (n_left_from >= 4 && n_left_to_next >= 2)
  90         {
  91           u32 bi0, bi1;
  92           vlib_buffer_t * b0, * b1;
  93           gre_header_t * h0, * h1;
  94           u16 version0, version1;
  95           int verr0, verr1;
  96           u32 i0, i1, next0, next1, protocol0, protocol1;
  97           ip4_header_t *ip0, *ip1;
  98
  99           /* Prefetch next iteration. */
 100           {
 101             vlib_buffer_t * p2, * p3;
 102
 103             p2 = vlib_get_buffer (vm, from[2]);
 104             p3 = vlib_get_buffer (vm, from[3]);
 105
 106             vlib_prefetch_buffer_header (p2, LOAD);
 107             vlib_prefetch_buffer_header (p3, LOAD);
 108
 109             CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
 110             CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
 111           }
 112
 113           bi0 = from[0];
 114           bi1 = from[1];
 115           to_next[0] = bi0;
 116           to_next[1] = bi1;
 117           from += 2;
 118           to_next += 2;
 119           n_left_to_next -= 2;
 120           n_left_from -= 2;
 121
 122           b0 = vlib_get_buffer (vm, bi0);
 123           b1 = vlib_get_buffer (vm, bi1);
 124
 125           /* ip4_local hands us the ip header, not the gre header */
 126           ip0 = vlib_buffer_get_current (b0);
 127           ip1 = vlib_buffer_get_current (b1);
 128
 129           /* Save src + dst ip4 address, e.g. for mpls-o-gre */
 130           vnet_buffer(b0)->gre.src = ip0->src_address.as_u32;
 131           vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32;
 132           vnet_buffer(b1)->gre.src = ip1->src_address.as_u32;
 133           vnet_buffer(b1)->gre.dst = ip1->dst_address.as_u32;
 134
 135           vlib_buffer_advance (b0, sizeof (*ip0));
 136           vlib_buffer_advance (b1, sizeof (*ip1));
 137
 138           h0 = vlib_buffer_get_current (b0);
 139           h1 = vlib_buffer_get_current (b1);
 140
 141           /* Index sparse array with network byte order. */
 142           protocol0 = h0->protocol;
 143           protocol1 = h1->protocol;
 144           sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1,
 145                              &i0, &i1);
 146           next0 = vec_elt(rt->next_by_protocol, i0);
 147           next1 = vec_elt(rt->next_by_protocol, i1);
 148
 149           b0->error = node->errors[i0 == SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
 150           b1->error = node->errors[i1 == SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
 151
 152           version0 = clib_net_to_host_u16 (h0->flags_and_version);
 153           verr0 =  version0 & GRE_VERSION_MASK;
 154           version1 = clib_net_to_host_u16 (h1->flags_and_version);
 155           verr1 =  version1 & GRE_VERSION_MASK;
 156
 157           b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
 158               : b0->error;
 159           next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
 160           b1->error = verr1 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
 161               : b1->error;
 162           next1 = verr1 ? GRE_INPUT_NEXT_DROP : next1;
 163
 164
 165           /* RPF check for ip4/ip6 input */
 166           if (PREDICT_FALSE(next0 == GRE_INPUT_NEXT_IP4_INPUT
 167                             || next0 == GRE_INPUT_NEXT_IP6_INPUT
 168                             || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT))
 169             {
 170               u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) |
 171                          (u64)(vnet_buffer(b0)->gre.src);
 172
 173               if (cached_tunnel_key != key)
 174                 {
 175                   vnet_hw_interface_t * hi;
 176                   gre_tunnel_t * t;
 177                   uword * p;
 178
 179                   ip4_main_t * ip4m = &ip4_main;
 180                   p = hash_get (gm->tunnel_by_key, key);
 181                   if (!p)
 182                     {
 183                       next0 = GRE_INPUT_NEXT_DROP;
 184                       b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 185                       goto drop0;
 186                     }
 187                   t = pool_elt_at_index (gm->tunnels, p[0]);
 188                   hi = vnet_get_hw_interface (gm->vnet_main,
 189                             t->hw_if_index);
 190                   tunnel_sw_if_index = hi->sw_if_index;
 191                   tunnel_fib_index = vec_elt (ip4m->fib_index_by_sw_if_index,
 192                                               tunnel_sw_if_index);
 193
 194                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 195                   cached_tunnel_fib_index = tunnel_fib_index;
 196                 }
 197               else
 198                 {
 199                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 200                   tunnel_fib_index = cached_tunnel_fib_index;
 201                 }
 202
 203               u32 len = vlib_buffer_length_in_chain (vm, b0);
 204               vnet_interface_main_t *im = &gm->vnet_main->interface_main;
 205               vlib_increment_combined_counter (im->combined_sw_if_counters
 206                                                + VNET_INTERFACE_COUNTER_RX,
 207                                                cpu_index,
 208                                                tunnel_sw_if_index,
 209                                                1 /* packets */,
 210                                                len /* bytes */);
 211
 212               vnet_buffer(b0)->sw_if_index[VLIB_TX] = tunnel_fib_index;
 213               vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
 214             }
 215
 216 drop0:
 217           if (PREDICT_FALSE(next1 == GRE_INPUT_NEXT_IP4_INPUT
 218                             || next1 == GRE_INPUT_NEXT_IP6_INPUT
 219                             || next1 == GRE_INPUT_NEXT_ETHERNET_INPUT))
 220             {
 221               u64 key = ((u64)(vnet_buffer(b1)->gre.dst) << 32) |
 222                          (u64)(vnet_buffer(b1)->gre.src);
 223
 224               if (cached_tunnel_key != key)
 225                 {
 226                   vnet_hw_interface_t * hi;
 227                   gre_tunnel_t * t;
 228                   uword * p;
 229
 230                   ip4_main_t * ip4m = &ip4_main;
 231                   p = hash_get (gm->tunnel_by_key, key);
 232                   if (!p)
 233                     {
 234                       next1 = GRE_INPUT_NEXT_DROP;
 235                       b1->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 236                       goto drop1;
 237                     }
 238                   t = pool_elt_at_index (gm->tunnels, p[0]);
 239                   hi = vnet_get_hw_interface (gm->vnet_main,
 240                             t->hw_if_index);
 241                   tunnel_sw_if_index = hi->sw_if_index;
 242                   tunnel_fib_index = vec_elt (ip4m->fib_index_by_sw_if_index,
 243                                               tunnel_sw_if_index);
 244
 245                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 246                   cached_tunnel_fib_index = tunnel_fib_index;
 247                 }
 248               else
 249                 {
 250                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 251                   tunnel_fib_index = cached_tunnel_fib_index;
 252                 }
 253
 254               u32 len = vlib_buffer_length_in_chain (vm, b1);
 255               vnet_interface_main_t *im = &gm->vnet_main->interface_main;
 256               vlib_increment_combined_counter (im->combined_sw_if_counters
 257                                                + VNET_INTERFACE_COUNTER_RX,
 258                                                cpu_index,
 259                                                tunnel_sw_if_index,
 260                                                1 /* packets */,
 261                                                len /* bytes */);
 262
 263               vnet_buffer(b1)->sw_if_index[VLIB_TX] = tunnel_fib_index;
 264               vnet_buffer(b1)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
 265             }
 266 drop1:
 267           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 268             {
 269               gre_rx_trace_t *tr = vlib_add_trace (vm, node,
 270                                                    b0, sizeof (*tr));
 271               tr->tunnel_id = ~0;
 272               tr->length = ip0->length;
 273               tr->src.as_u32 = ip0->src_address.as_u32;
 274               tr->dst.as_u32 = ip0->dst_address.as_u32;
 275             }
 276
 277           if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
 278             {
 279               gre_rx_trace_t *tr = vlib_add_trace (vm, node,
 280                                                    b1, sizeof (*tr));
 281               tr->tunnel_id = ~0;
 282               tr->length = ip1->length;
 283               tr->src.as_u32 = ip1->src_address.as_u32;
 284               tr->dst.as_u32 = ip1->dst_address.as_u32;
 285             }
 286
 287           vlib_buffer_advance (b0, sizeof (*h0));
 288           vlib_buffer_advance (b1, sizeof (*h1));
 289
 290           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 291                                            to_next, n_left_to_next,
 292                                            bi0, bi1, next0, next1);
 293         }
 294
 295       while (n_left_from > 0 && n_left_to_next > 0)
 296         {
 297           u32 bi0;
 298           vlib_buffer_t * b0;
 299           gre_header_t * h0;
 300           ip4_header_t * ip0;
 301           u16 version0;
 302           int verr0;
 303           u32 i0, next0;
 304
 305           bi0 = from[0];
 306           to_next[0] = bi0;
 307           from += 1;
 308           to_next += 1;
 309           n_left_from -= 1;
 310           n_left_to_next -= 1;
 311
 312           b0 = vlib_get_buffer (vm, bi0);
 313           ip0 = vlib_buffer_get_current (b0);
 314
 315           vnet_buffer(b0)->gre.src = ip0->src_address.as_u32;
 316           vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32;
 317
 318           vlib_buffer_advance (b0, sizeof (*ip0));
 319
 320           h0 = vlib_buffer_get_current (b0);
 321
 322           i0 = sparse_vec_index (rt->next_by_protocol, h0->protocol);
 323           next0 = vec_elt(rt->next_by_protocol, i0);
 324
 325           b0->error =
 326               node->errors[i0 == SPARSE_VEC_INVALID_INDEX
 327                            ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
 328
 329           version0 = clib_net_to_host_u16 (h0->flags_and_version);
 330           verr0 =  version0 & GRE_VERSION_MASK;
 331           b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
 332               : b0->error;
 333           next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
 334
 335
 336           /* For IP payload we need to find source interface
 337              so we can increase counters and help forward node to
 338              pick right FIB */
 339           if (PREDICT_FALSE(next0 == GRE_INPUT_NEXT_IP4_INPUT
 340                             || next0 == GRE_INPUT_NEXT_IP6_INPUT
 341                             || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT))
 342             {
 343               u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) |
 344                          (u64)(vnet_buffer(b0)->gre.src);
 345
 346               if (cached_tunnel_key != key)
 347                 {
 348                   vnet_hw_interface_t * hi;
 349                   gre_tunnel_t * t;
 350                   uword * p;
 351
 352                   ip4_main_t * ip4m = &ip4_main;
 353                   p = hash_get (gm->tunnel_by_key, key);
 354                   if (!p)
 355                     {
 356                       next0 = GRE_INPUT_NEXT_DROP;
 357                       b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 358                       goto drop;
 359                     }
 360                   t = pool_elt_at_index (gm->tunnels, p[0]);
 361                   hi = vnet_get_hw_interface (gm->vnet_main,
 362                             t->hw_if_index);
 363                   tunnel_sw_if_index = hi->sw_if_index;
 364                   tunnel_fib_index = vec_elt (ip4m->fib_index_by_sw_if_index,
 365                                               tunnel_sw_if_index);
 366
 367                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 368                   cached_tunnel_fib_index = tunnel_fib_index;
 369                 }
 370               else
 371                 {
 372                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 373                   tunnel_fib_index = cached_tunnel_fib_index;
 374                 }
 375
 376               u32 len = vlib_buffer_length_in_chain (vm, b0);
 377               vnet_interface_main_t *im = &gm->vnet_main->interface_main;
 378               vlib_increment_combined_counter (im->combined_sw_if_counters
 379                                                + VNET_INTERFACE_COUNTER_RX,
 380                                                cpu_index,
 381                                                tunnel_sw_if_index,
 382                                                1 /* packets */,
 383                                                len /* bytes */);
 384
 385               vnet_buffer(b0)->sw_if_index[VLIB_TX] = tunnel_fib_index;
 386               vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
 387             }
 388
 389 drop:
 390           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 391             {
 392               gre_rx_trace_t *tr = vlib_add_trace (vm, node,
 393                                                    b0, sizeof (*tr));
 394               tr->tunnel_id = ~0;
 395               tr->length = ip0->length;
 396               tr->src.as_u32 = ip0->src_address.as_u32;
 397               tr->dst.as_u32 = ip0->dst_address.as_u32;
 398             }
 399
 400           vlib_buffer_advance (b0, sizeof (*h0));
 401
 402           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 403                                            to_next, n_left_to_next,
 404                                            bi0, next0);
 405         }
 406
 407       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 408     }
 409   vlib_node_increment_counter (vm, gre_input_node.index,
 410                                GRE_ERROR_PKTS_DECAP, from_frame->n_vectors);
 411   return from_frame->n_vectors;
 412 }
 413
 414 static char * gre_error_strings[] = {
 415 #define gre_error(n,s) s,
 416 #include "error.def"
 417 #undef gre_error
 418 };
 419
 420 VLIB_REGISTER_NODE (gre_input_node) = {
 421   .function = gre_input,
 422   .name = "gre-input",
 423   /* Takes a vector of packets. */
 424   .vector_size = sizeof (u32),
 425
 426   .runtime_data_bytes = sizeof (gre_input_runtime_t),
 427
 428   .n_errors = GRE_N_ERROR,
 429   .error_strings = gre_error_strings,
 430
 431   .n_next_nodes = GRE_INPUT_N_NEXT,
 432   .next_nodes = {
 433 #define _(s,n) [GRE_INPUT_NEXT_##s] = n,
 434     foreach_gre_input_next
 435 #undef _
 436   },
 437
 438   .format_buffer = format_gre_header_with_length,
 439   .format_trace = format_gre_rx_trace,
 440   .unformat_buffer = unformat_gre_header,
 441 };
 442
 443 VLIB_NODE_FUNCTION_MULTIARCH (gre_input_node, gre_input)
 444
 445 void
 446 gre_register_input_protocol (vlib_main_t * vm,
 447                              gre_protocol_t protocol,
 448                              u32 node_index)
 449 {
 450   gre_main_t * em = &gre_main;
 451   gre_protocol_info_t * pi;
 452   gre_input_runtime_t * rt;
 453   u16 * n;
 454
 455   {
 456     clib_error_t * error = vlib_call_init_function (vm, gre_input_init);
 457     if (error)
 458       clib_error_report (error);
 459   }
 460
 461   pi = gre_get_protocol_info (em, protocol);
 462   pi->node_index = node_index;
 463   pi->next_index = vlib_node_add_next (vm,
 464                                        gre_input_node.index,
 465                                        node_index);
 466
 467   /* Setup gre protocol -> next index sparse vector mapping. */
 468   rt = vlib_node_get_runtime_data (vm, gre_input_node.index);
 469   n = sparse_vec_validate (rt->next_by_protocol,
 470                            clib_host_to_net_u16 (protocol));
 471   n[0] = pi->next_index;
 472 }
 473
 474 static void
 475 gre_setup_node (vlib_main_t * vm, u32 node_index)
 476 {
 477   vlib_node_t * n = vlib_get_node (vm, node_index);
 478   pg_node_t * pn = pg_get_node (node_index);
 479
 480   n->format_buffer = format_gre_header_with_length;
 481   n->unformat_buffer = unformat_gre_header;
 482   pn->unformat_edit = unformat_pg_gre_header;
 483 }
 484
 485 static clib_error_t * gre_input_init (vlib_main_t * vm)
 486 {
 487   gre_input_runtime_t * rt;
 488   vlib_node_t *ethernet_input, *ip4_input, *ip6_input, *mpls_unicast_input;
 489
 490   {
 491     clib_error_t * error;
 492     error = vlib_call_init_function (vm, gre_init);
 493     if (error)
 494       clib_error_report (error);
 495   }
 496
 497   gre_setup_node (vm, gre_input_node.index);
 498
 499   rt = vlib_node_get_runtime_data (vm, gre_input_node.index);
 500
 501   rt->next_by_protocol = sparse_vec_new
 502     (/* elt bytes */ sizeof (rt->next_by_protocol[0]),
 503      /* bits in index */ BITS (((gre_header_t *) 0)->protocol));
 504
 505   /* These could be moved to the supported protocol input node defn's */
 506   ethernet_input = vlib_get_node_by_name (vm, (u8 *)"ethernet-input");
 507   ASSERT(ethernet_input);
 508   ip4_input = vlib_get_node_by_name (vm, (u8 *)"ip4-input");
 509   ASSERT(ip4_input);
 510   ip6_input = vlib_get_node_by_name (vm, (u8 *)"ip6-input");
 511   ASSERT(ip6_input);
 512   mpls_unicast_input = vlib_get_node_by_name (vm, (u8 *)"mpls-gre-input");
 513   ASSERT(mpls_unicast_input);
 514
 515   gre_register_input_protocol (vm, GRE_PROTOCOL_teb,
 516                                ethernet_input->index);
 517
 518   gre_register_input_protocol (vm, GRE_PROTOCOL_ip4,
 519                                ip4_input->index);
 520
 521   gre_register_input_protocol (vm, GRE_PROTOCOL_ip6,
 522                                ip6_input->index);
 523
 524   gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast,
 525                                mpls_unicast_input->index);
 526
 527   ip4_register_protocol (IP_PROTOCOL_GRE, gre_input_node.index);
 528
 529   return 0;
 530 }
 531
 532 VLIB_INIT_FUNCTION (gre_input_init);