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 <vnet/mpls/mpls.h>
  22 #include <vppinfra/sparse_vec.h>
  23
  24 #define foreach_gre_input_next                  \
  25 _(PUNT, "error-punt")                           \
  26 _(DROP, "error-drop")                           \
  27 _(ETHERNET_INPUT, "ethernet-input")             \
  28 _(IP4_INPUT, "ip4-input")                       \
  29 _(IP6_INPUT, "ip6-input")                       \
  30 _(MPLS_INPUT, "mpls-input")
  31
  32 typedef enum {
  33 #define _(s,n) GRE_INPUT_NEXT_##s,
  34   foreach_gre_input_next
  35 #undef _
  36   GRE_INPUT_N_NEXT,
  37 } gre_input_next_t;
  38
  39 typedef struct {
  40   u32 tunnel_id;
  41   u32 length;
  42   ip4_address_t src;
  43   ip4_address_t dst;
  44 } gre_rx_trace_t;
  45
  46 u8 * format_gre_rx_trace (u8 * s, va_list * args)
  47 {
  48   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  49   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  50   gre_rx_trace_t * t = va_arg (*args, gre_rx_trace_t *);
  51
  52   s = format (s, "GRE: tunnel %d len %d src %U dst %U",
  53               t->tunnel_id, clib_net_to_host_u16(t->length),
  54               format_ip4_address, &t->src.as_u8,
  55               format_ip4_address, &t->dst.as_u8);
  56   return s;
  57 }
  58
  59 typedef struct {
  60   /* Sparse vector mapping gre protocol in network byte order
  61      to next index. */
  62   u16 * next_by_protocol;
  63 } gre_input_runtime_t;
  64
  65 static uword
  66 gre_input (vlib_main_t * vm,
  67            vlib_node_runtime_t * node,
  68            vlib_frame_t * from_frame)
  69 {
  70   gre_main_t * gm = &gre_main;
  71   gre_input_runtime_t * rt = (void *) node->runtime_data;
  72   __attribute__((unused)) u32 n_left_from, next_index, * from, * to_next;
  73   u64 cached_tunnel_key = (u64) ~0;
  74   u32 cached_tunnel_sw_if_index = 0, tunnel_sw_if_index = 0;
  75
  76   u32 cpu_index = os_get_cpu_number();
  77   u32 len;
  78   vnet_interface_main_t *im = &gm->vnet_main->interface_main;
  79
  80   from = vlib_frame_vector_args (from_frame);
  81   n_left_from = from_frame->n_vectors;
  82
  83   next_index = node->cached_next_index;
  84
  85   while (n_left_from > 0)
  86     {
  87       u32 n_left_to_next;
  88
  89       vlib_get_next_frame (vm, node, next_index,
  90                            to_next, n_left_to_next);
  91
  92       while (n_left_from >= 4 && n_left_to_next >= 2)
  93         {
  94           u32 bi0, bi1;
  95           vlib_buffer_t * b0, * b1;
  96           gre_header_t * h0, * h1;
  97           u16 version0, version1;
  98           int verr0, verr1;
  99           u32 i0, i1, next0, next1, protocol0, protocol1;
 100           ip4_header_t *ip0, *ip1;
 101
 102           /* Prefetch next iteration. */
 103           {
 104             vlib_buffer_t * p2, * p3;
 105
 106             p2 = vlib_get_buffer (vm, from[2]);
 107             p3 = vlib_get_buffer (vm, from[3]);
 108
 109             vlib_prefetch_buffer_header (p2, LOAD);
 110             vlib_prefetch_buffer_header (p3, LOAD);
 111
 112             CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
 113             CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
 114           }
 115
 116           bi0 = from[0];
 117           bi1 = from[1];
 118           to_next[0] = bi0;
 119           to_next[1] = bi1;
 120           from += 2;
 121           to_next += 2;
 122           n_left_to_next -= 2;
 123           n_left_from -= 2;
 124
 125           b0 = vlib_get_buffer (vm, bi0);
 126           b1 = vlib_get_buffer (vm, bi1);
 127
 128           /* ip4_local hands us the ip header, not the gre header */
 129           ip0 = vlib_buffer_get_current (b0);
 130           ip1 = vlib_buffer_get_current (b1);
 131
 132           /* Save src + dst ip4 address, e.g. for mpls-o-gre */
 133           vnet_buffer(b0)->gre.src = ip0->src_address.as_u32;
 134           vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32;
 135           vnet_buffer(b1)->gre.src = ip1->src_address.as_u32;
 136           vnet_buffer(b1)->gre.dst = ip1->dst_address.as_u32;
 137
 138           vlib_buffer_advance (b0, sizeof (*ip0));
 139           vlib_buffer_advance (b1, sizeof (*ip1));
 140
 141           h0 = vlib_buffer_get_current (b0);
 142           h1 = vlib_buffer_get_current (b1);
 143
 144           /* Index sparse array with network byte order. */
 145           protocol0 = h0->protocol;
 146           protocol1 = h1->protocol;
 147           sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1,
 148                              &i0, &i1);
 149           next0 = vec_elt(rt->next_by_protocol, i0);
 150           next1 = vec_elt(rt->next_by_protocol, i1);
 151
 152           b0->error = node->errors[i0 == SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
 153           b1->error = node->errors[i1 == SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
 154
 155           version0 = clib_net_to_host_u16 (h0->flags_and_version);
 156           verr0 =  version0 & GRE_VERSION_MASK;
 157           version1 = clib_net_to_host_u16 (h1->flags_and_version);
 158           verr1 =  version1 & GRE_VERSION_MASK;
 159
 160           b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
 161               : b0->error;
 162           next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
 163           b1->error = verr1 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
 164               : b1->error;
 165           next1 = verr1 ? GRE_INPUT_NEXT_DROP : next1;
 166
 167
 168           /* RPF check for ip4/ip6 input */
 169           if (PREDICT_TRUE(next0 == GRE_INPUT_NEXT_IP4_INPUT
 170                            || next0 == GRE_INPUT_NEXT_IP6_INPUT
 171                            || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT
 172                            || next0 == GRE_INPUT_NEXT_MPLS_INPUT))
 173             {
 174               u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) |
 175                          (u64)(vnet_buffer(b0)->gre.src);
 176
 177               if (cached_tunnel_key != key)
 178                 {
 179                   vnet_hw_interface_t * hi;
 180                   gre_tunnel_t * t;
 181                   uword * p;
 182
 183                   p = hash_get (gm->tunnel_by_key, key);
 184                   if (!p)
 185                     {
 186                       next0 = GRE_INPUT_NEXT_DROP;
 187                       b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 188                       goto drop0;
 189                     }
 190                   t = pool_elt_at_index (gm->tunnels, p[0]);
 191                   hi = vnet_get_hw_interface (gm->vnet_main,
 192                             t->hw_if_index);
 193                   tunnel_sw_if_index = hi->sw_if_index;
 194
 195                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 196                 }
 197               else
 198                 {
 199                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 200                 }
 201             }
 202           else
 203             {
 204                 next0 = GRE_INPUT_NEXT_DROP;
 205                 goto drop0;
 206             }
 207           len = vlib_buffer_length_in_chain (vm, b0);
 208           vlib_increment_combined_counter (im->combined_sw_if_counters
 209                                            + VNET_INTERFACE_COUNTER_RX,
 210                                            cpu_index,
 211                                            tunnel_sw_if_index,
 212                                            1 /* packets */,
 213                                            len /* bytes */);
 214
 215           vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
 216
 217 drop0:
 218           if (PREDICT_TRUE(next1 == GRE_INPUT_NEXT_IP4_INPUT
 219                            || next1 == GRE_INPUT_NEXT_IP6_INPUT
 220                            || next1 == GRE_INPUT_NEXT_ETHERNET_INPUT
 221                            || next1 == GRE_INPUT_NEXT_MPLS_INPUT))
 222             {
 223               u64 key = ((u64)(vnet_buffer(b1)->gre.dst) << 32) |
 224                          (u64)(vnet_buffer(b1)->gre.src);
 225
 226               if (cached_tunnel_key != key)
 227                 {
 228                   vnet_hw_interface_t * hi;
 229                   gre_tunnel_t * t;
 230                   uword * p;
 231
 232                   p = hash_get (gm->tunnel_by_key, key);
 233                   if (!p)
 234                     {
 235                       next1 = GRE_INPUT_NEXT_DROP;
 236                       b1->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 237                       goto drop1;
 238                     }
 239                   t = pool_elt_at_index (gm->tunnels, p[0]);
 240                   hi = vnet_get_hw_interface (gm->vnet_main,
 241                             t->hw_if_index);
 242                   tunnel_sw_if_index = hi->sw_if_index;
 243
 244                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 245                 }
 246               else
 247                 {
 248                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 249                 }
 250             }
 251           else
 252             {
 253                 next1 = GRE_INPUT_NEXT_DROP;
 254                 goto drop1;
 255             }
 256           len = vlib_buffer_length_in_chain (vm, b1);
 257           vlib_increment_combined_counter (im->combined_sw_if_counters
 258                                            + VNET_INTERFACE_COUNTER_RX,
 259                                            cpu_index,
 260                                            tunnel_sw_if_index,
 261                                            1 /* packets */,
 262                                            len /* bytes */);
 263
 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 = tunnel_sw_if_index;
 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 = tunnel_sw_if_index;
 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           /* RPF check for ip4/ip6 input */
 340           if (PREDICT_TRUE(next0 == GRE_INPUT_NEXT_IP4_INPUT
 341                            || next0 == GRE_INPUT_NEXT_IP6_INPUT
 342                            || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT
 343                            || next0 == GRE_INPUT_NEXT_MPLS_INPUT))
 344             {
 345               u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) |
 346                          (u64)(vnet_buffer(b0)->gre.src);
 347
 348               if (cached_tunnel_key != key)
 349                 {
 350                   vnet_hw_interface_t * hi;
 351                   gre_tunnel_t * t;
 352                   uword * p;
 353
 354                   p = hash_get (gm->tunnel_by_key, key);
 355                   if (!p)
 356                     {
 357                       next0 = GRE_INPUT_NEXT_DROP;
 358                       b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 359                       goto drop;
 360                     }
 361                   t = pool_elt_at_index (gm->tunnels, p[0]);
 362                   hi = vnet_get_hw_interface (gm->vnet_main,
 363                             t->hw_if_index);
 364                   tunnel_sw_if_index = hi->sw_if_index;
 365
 366                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 367                 }
 368               else
 369                 {
 370                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 371                 }
 372             }
 373           else
 374             {
 375                 next0 = GRE_INPUT_NEXT_DROP;
 376                 goto drop;
 377             }
 378           len = vlib_buffer_length_in_chain (vm, b0);
 379           vlib_increment_combined_counter (im->combined_sw_if_counters
 380                                            + VNET_INTERFACE_COUNTER_RX,
 381                                            cpu_index,
 382                                            tunnel_sw_if_index,
 383                                            1 /* packets */,
 384                                            len /* bytes */);
 385
 386           vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
 387
 388 drop:
 389           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 390             {
 391               gre_rx_trace_t *tr = vlib_add_trace (vm, node,
 392                                                    b0, sizeof (*tr));
 393               tr->tunnel_id = tunnel_sw_if_index;
 394               tr->length = ip0->length;
 395               tr->src.as_u32 = ip0->src_address.as_u32;
 396               tr->dst.as_u32 = ip0->dst_address.as_u32;
 397             }
 398
 399           vlib_buffer_advance (b0, sizeof (*h0));
 400
 401           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 402                                            to_next, n_left_to_next,
 403                                            bi0, next0);
 404         }
 405
 406       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 407     }
 408   vlib_node_increment_counter (vm, gre_input_node.index,
 409                                GRE_ERROR_PKTS_DECAP, from_frame->n_vectors);
 410   return from_frame->n_vectors;
 411 }
 412
 413 static char * gre_error_strings[] = {
 414 #define gre_error(n,s) s,
 415 #include "error.def"
 416 #undef gre_error
 417 };
 418
 419 VLIB_REGISTER_NODE (gre_input_node) = {
 420   .function = gre_input,
 421   .name = "gre-input",
 422   /* Takes a vector of packets. */
 423   .vector_size = sizeof (u32),
 424
 425   .runtime_data_bytes = sizeof (gre_input_runtime_t),
 426
 427   .n_errors = GRE_N_ERROR,
 428   .error_strings = gre_error_strings,
 429
 430   .n_next_nodes = GRE_INPUT_N_NEXT,
 431   .next_nodes = {
 432 #define _(s,n) [GRE_INPUT_NEXT_##s] = n,
 433     foreach_gre_input_next
 434 #undef _
 435   },
 436
 437   .format_buffer = format_gre_header_with_length,
 438   .format_trace = format_gre_rx_trace,
 439   .unformat_buffer = unformat_gre_header,
 440 };
 441
 442 VLIB_NODE_FUNCTION_MULTIARCH (gre_input_node, gre_input)
 443
 444 void
 445 gre_register_input_protocol (vlib_main_t * vm,
 446                              gre_protocol_t protocol,
 447                              u32 node_index)
 448 {
 449   gre_main_t * em = &gre_main;
 450   gre_protocol_info_t * pi;
 451   gre_input_runtime_t * rt;
 452   u16 * n;
 453
 454   {
 455     clib_error_t * error = vlib_call_init_function (vm, gre_input_init);
 456     if (error)
 457       clib_error_report (error);
 458   }
 459
 460   pi = gre_get_protocol_info (em, protocol);
 461   pi->node_index = node_index;
 462   pi->next_index = vlib_node_add_next (vm,
 463                                        gre_input_node.index,
 464                                        node_index);
 465
 466   /* Setup gre protocol -> next index sparse vector mapping. */
 467   rt = vlib_node_get_runtime_data (vm, gre_input_node.index);
 468   n = sparse_vec_validate (rt->next_by_protocol,
 469                            clib_host_to_net_u16 (protocol));
 470   n[0] = pi->next_index;
 471 }
 472
 473 static void
 474 gre_setup_node (vlib_main_t * vm, u32 node_index)
 475 {
 476   vlib_node_t * n = vlib_get_node (vm, node_index);
 477   pg_node_t * pn = pg_get_node (node_index);
 478
 479   n->format_buffer = format_gre_header_with_length;
 480   n->unformat_buffer = unformat_gre_header;
 481   pn->unformat_edit = unformat_pg_gre_header;
 482 }
 483
 484 static clib_error_t * gre_input_init (vlib_main_t * vm)
 485 {
 486   gre_input_runtime_t * rt;
 487   vlib_node_t *ethernet_input, *ip4_input, *ip6_input, *mpls_unicast_input;
 488
 489   {
 490     clib_error_t * error;
 491     error = vlib_call_init_function (vm, gre_init);
 492     if (error)
 493       clib_error_report (error);
 494   }
 495
 496   gre_setup_node (vm, gre_input_node.index);
 497
 498   rt = vlib_node_get_runtime_data (vm, gre_input_node.index);
 499
 500   rt->next_by_protocol = sparse_vec_new
 501     (/* elt bytes */ sizeof (rt->next_by_protocol[0]),
 502      /* bits in index */ BITS (((gre_header_t *) 0)->protocol));
 503
 504   /* These could be moved to the supported protocol input node defn's */
 505   ethernet_input = vlib_get_node_by_name (vm, (u8 *)"ethernet-input");
 506   ASSERT(ethernet_input);
 507   ip4_input = vlib_get_node_by_name (vm, (u8 *)"ip4-input");
 508   ASSERT(ip4_input);
 509   ip6_input = vlib_get_node_by_name (vm, (u8 *)"ip6-input");
 510   ASSERT(ip6_input);
 511   mpls_unicast_input = vlib_get_node_by_name (vm, (u8 *)"mpls-input");
 512   ASSERT(mpls_unicast_input);
 513
 514   gre_register_input_protocol (vm, GRE_PROTOCOL_teb,
 515                                ethernet_input->index);
 516
 517   gre_register_input_protocol (vm, GRE_PROTOCOL_ip4,
 518                                ip4_input->index);
 519
 520   gre_register_input_protocol (vm, GRE_PROTOCOL_ip6,
 521                                ip6_input->index);
 522
 523   gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast,
 524                                mpls_unicast_input->index);
 525
 526   ip4_register_protocol (IP_PROTOCOL_GRE, gre_input_node.index);
 527
 528   return 0;
 529 }
 530
 531 VLIB_INIT_FUNCTION (gre_input_init);