src/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 {
  34 #define _(s,n) GRE_INPUT_NEXT_##s,
  35   foreach_gre_input_next
  36 #undef _
  37     GRE_INPUT_N_NEXT,
  38 } gre_input_next_t;
  39
  40 typedef struct
  41 {
  42   u32 tunnel_id;
  43   u32 length;
  44   ip46_address_t src;
  45   ip46_address_t dst;
  46   u8 is_ipv6;
  47 } gre_rx_trace_t;
  48
  49 u8 *
  50 format_gre_rx_trace (u8 * s, va_list * args)
  51 {
  52   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  53   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  54   gre_rx_trace_t *t = va_arg (*args, gre_rx_trace_t *);
  55
  56   s = format (s, "GRE: tunnel %d len %d src %U dst %U",
  57               t->tunnel_id, clib_net_to_host_u16 (t->length),
  58               format_ip46_address, &t->src, IP46_TYPE_ANY,
  59               format_ip46_address, &t->dst, IP46_TYPE_ANY);
  60   return s;
  61 }
  62
  63 typedef struct
  64 {
  65   /* Sparse vector mapping gre protocol in network byte order
  66      to next index. */
  67   u16 *next_by_protocol;
  68 } gre_input_runtime_t;
  69
  70 always_inline uword
  71 gre_input (vlib_main_t * vm,
  72            vlib_node_runtime_t * node, vlib_frame_t * from_frame, u8 is_ipv6)
  73 {
  74   gre_main_t *gm = &gre_main;
  75   __attribute__ ((unused)) u32 n_left_from, next_index, *from, *to_next;
  76   gre_tunnel_key_t cached_tunnel_key;
  77
  78   u32 cached_tunnel_sw_if_index = ~0, tunnel_sw_if_index = ~0;
  79
  80   u32 thread_index = vlib_get_thread_index ();
  81   u32 len;
  82   vnet_interface_main_t *im = &gm->vnet_main->interface_main;
  83
  84   if (!is_ipv6)
  85     memset (&cached_tunnel_key.gtk_v4, 0xff,
  86             sizeof (cached_tunnel_key.gtk_v4));
  87   else
  88     memset (&cached_tunnel_key.gtk_v6, 0xff,
  89             sizeof (cached_tunnel_key.gtk_v6));
  90
  91   from = vlib_frame_vector_args (from_frame);
  92   n_left_from = from_frame->n_vectors;
  93
  94   next_index = node->cached_next_index;
  95
  96   while (n_left_from > 0)
  97     {
  98       u32 n_left_to_next;
  99
 100       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 101
 102       while (n_left_from >= 4 && n_left_to_next >= 2)
 103         {
 104           u32 bi0, bi1;
 105           vlib_buffer_t *b0, *b1;
 106           gre_header_t *h0, *h1;
 107           u16 version0, version1;
 108           int verr0, verr1;
 109           u32 i0, i1, next0, next1, protocol0, protocol1;
 110           ip4_header_t *ip4_0, *ip4_1;
 111           ip6_header_t *ip6_0, *ip6_1;
 112           gre_tunnel_key_t key0, key1;
 113
 114           /* Prefetch next iteration. */
 115           {
 116             vlib_buffer_t *p2, *p3;
 117
 118             p2 = vlib_get_buffer (vm, from[2]);
 119             p3 = vlib_get_buffer (vm, from[3]);
 120
 121             vlib_prefetch_buffer_header (p2, LOAD);
 122             vlib_prefetch_buffer_header (p3, LOAD);
 123
 124             CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD);
 125             CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD);
 126           }
 127
 128           bi0 = from[0];
 129           bi1 = from[1];
 130           to_next[0] = bi0;
 131           to_next[1] = bi1;
 132           from += 2;
 133           to_next += 2;
 134           n_left_to_next -= 2;
 135           n_left_from -= 2;
 136
 137           b0 = vlib_get_buffer (vm, bi0);
 138           b1 = vlib_get_buffer (vm, bi1);
 139
 140           if (!is_ipv6)
 141             {
 142               /* ip4_local hands us the ip header, not the gre header */
 143               ip4_0 = vlib_buffer_get_current (b0);
 144               ip4_1 = vlib_buffer_get_current (b1);
 145
 146               vlib_buffer_advance (b0, sizeof (*ip4_0));
 147               vlib_buffer_advance (b1, sizeof (*ip4_1));
 148             }
 149           else
 150             {
 151               /* ip6_local hands us the ip header, not the gre header */
 152               ip6_0 = vlib_buffer_get_current (b0);
 153               ip6_1 = vlib_buffer_get_current (b1);
 154
 155               vlib_buffer_advance (b0, sizeof (*ip6_0));
 156               vlib_buffer_advance (b1, sizeof (*ip6_1));
 157             }
 158
 159           h0 = vlib_buffer_get_current (b0);
 160           h1 = vlib_buffer_get_current (b1);
 161
 162           /* Index sparse array with network byte order. */
 163           protocol0 = h0->protocol;
 164           protocol1 = h1->protocol;
 165           sparse_vec_index2 (gm->next_by_protocol, protocol0, protocol1,
 166                              &i0, &i1);
 167           next0 = vec_elt (gm->next_by_protocol, i0);
 168           next1 = vec_elt (gm->next_by_protocol, i1);
 169
 170           b0->error =
 171             node->errors[i0 ==
 172                          SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL
 173                          : GRE_ERROR_NONE];
 174           b1->error =
 175             node->errors[i1 ==
 176                          SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL
 177                          : GRE_ERROR_NONE];
 178
 179           version0 = clib_net_to_host_u16 (h0->flags_and_version);
 180           verr0 = version0 & GRE_VERSION_MASK;
 181           version1 = clib_net_to_host_u16 (h1->flags_and_version);
 182           verr1 = version1 & GRE_VERSION_MASK;
 183
 184           b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
 185             : b0->error;
 186           next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
 187           b1->error = verr1 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
 188             : b1->error;
 189           next1 = verr1 ? GRE_INPUT_NEXT_DROP : next1;
 190
 191
 192           /* RPF check for ip4/ip6 input */
 193           if (PREDICT_TRUE (next0 == GRE_INPUT_NEXT_IP4_INPUT
 194                             || next0 == GRE_INPUT_NEXT_IP6_INPUT
 195                             || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT
 196                             || next0 == GRE_INPUT_NEXT_MPLS_INPUT))
 197             {
 198               if (is_ipv6)
 199                 {
 200                   gre_mk_key6 (&ip6_0->dst_address,
 201                                &ip6_0->src_address,
 202                                vnet_buffer (b0)->ip.fib_index, &key0.gtk_v6);
 203                 }
 204               else
 205                 {
 206                   gre_mk_key4 (&ip4_0->dst_address,
 207                                &ip4_0->src_address,
 208                                vnet_buffer (b0)->ip.fib_index, &key0.gtk_v4);
 209                 }
 210
 211               if ((!is_ipv6 && !gre_match_key4 (&cached_tunnel_key.gtk_v4,
 212                                                 &key0.gtk_v4)) ||
 213                   (is_ipv6 && !gre_match_key6 (&cached_tunnel_key.gtk_v6,
 214                                                &key0.gtk_v6)))
 215                 {
 216                   gre_tunnel_t *t;
 217                   uword *p;
 218
 219                   if (!is_ipv6)
 220                     {
 221                       p = hash_get_mem (gm->tunnel_by_key4, &key0.gtk_v4);
 222                     }
 223                   else
 224                     {
 225                       p = hash_get_mem (gm->tunnel_by_key6, &key0.gtk_v6);
 226                     }
 227                   if (!p)
 228                     {
 229                       next0 = GRE_INPUT_NEXT_DROP;
 230                       b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 231                       goto drop0;
 232                     }
 233                   t = pool_elt_at_index (gm->tunnels, p[0]);
 234                   tunnel_sw_if_index = t->sw_if_index;
 235
 236                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 237                   if (!is_ipv6)
 238                     {
 239                       cached_tunnel_key.gtk_v4 = key0.gtk_v4;
 240                     }
 241                   else
 242                     {
 243                       cached_tunnel_key.gtk_v6 = key0.gtk_v6;
 244                     }
 245                 }
 246               else
 247                 {
 248                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 249                 }
 250             }
 251           else
 252             {
 253               next0 = GRE_INPUT_NEXT_DROP;
 254               goto drop0;
 255             }
 256           len = vlib_buffer_length_in_chain (vm, b0);
 257           vlib_increment_combined_counter (im->combined_sw_if_counters
 258                                            + VNET_INTERFACE_COUNTER_RX,
 259                                            thread_index,
 260                                            tunnel_sw_if_index,
 261                                            1 /* packets */ ,
 262                                            len /* bytes */ );
 263
 264           vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
 265
 266         drop0:
 267           if (PREDICT_TRUE (next1 == GRE_INPUT_NEXT_IP4_INPUT
 268                             || next1 == GRE_INPUT_NEXT_IP6_INPUT
 269                             || next1 == GRE_INPUT_NEXT_ETHERNET_INPUT
 270                             || next1 == GRE_INPUT_NEXT_MPLS_INPUT))
 271             {
 272               if (is_ipv6)
 273                 {
 274                   gre_mk_key6 (&ip6_1->dst_address,
 275                                &ip6_1->src_address,
 276                                vnet_buffer (b1)->ip.fib_index, &key1.gtk_v6);
 277                 }
 278               else
 279                 {
 280                   gre_mk_key4 (&ip4_1->dst_address,
 281                                &ip4_1->src_address,
 282                                vnet_buffer (b1)->ip.fib_index, &key1.gtk_v4);
 283                 }
 284
 285               if ((!is_ipv6 && !gre_match_key4 (&cached_tunnel_key.gtk_v4,
 286                                                 &key1.gtk_v4)) ||
 287                   (is_ipv6 && !gre_match_key6 (&cached_tunnel_key.gtk_v6,
 288                                                &key1.gtk_v6)))
 289                 {
 290                   gre_tunnel_t *t;
 291                   uword *p;
 292
 293                   if (!is_ipv6)
 294                     {
 295                       p = hash_get_mem (gm->tunnel_by_key4, &key1.gtk_v4);
 296                     }
 297                   else
 298                     {
 299                       p = hash_get_mem (gm->tunnel_by_key6, &key1.gtk_v6);
 300                     }
 301                   if (!p)
 302                     {
 303                       next1 = GRE_INPUT_NEXT_DROP;
 304                       b1->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 305                       goto drop1;
 306                     }
 307                   t = pool_elt_at_index (gm->tunnels, p[0]);
 308                   tunnel_sw_if_index = t->sw_if_index;
 309
 310                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 311                   if (!is_ipv6)
 312                     {
 313                       cached_tunnel_key.gtk_v4 = key1.gtk_v4;
 314                     }
 315                   else
 316                     {
 317                       cached_tunnel_key.gtk_v6 = key1.gtk_v6;
 318                     }
 319                 }
 320               else
 321                 {
 322                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 323                 }
 324             }
 325           else
 326             {
 327               next1 = GRE_INPUT_NEXT_DROP;
 328               goto drop1;
 329             }
 330           len = vlib_buffer_length_in_chain (vm, b1);
 331           vlib_increment_combined_counter (im->combined_sw_if_counters
 332                                            + VNET_INTERFACE_COUNTER_RX,
 333                                            thread_index,
 334                                            tunnel_sw_if_index,
 335                                            1 /* packets */ ,
 336                                            len /* bytes */ );
 337
 338           vnet_buffer (b1)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
 339
 340         drop1:
 341           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 342             {
 343               gre_rx_trace_t *tr = vlib_add_trace (vm, node,
 344                                                    b0, sizeof (*tr));
 345               tr->tunnel_id = tunnel_sw_if_index;
 346               if (!is_ipv6)
 347                 {
 348                   tr->length = ip4_0->length;
 349                   tr->src.ip4.as_u32 = ip4_0->src_address.as_u32;
 350                   tr->dst.ip4.as_u32 = ip4_0->dst_address.as_u32;
 351                 }
 352               else
 353                 {
 354                   tr->length = ip6_0->payload_length;
 355                   tr->src.ip6.as_u64[0] = ip6_0->src_address.as_u64[0];
 356                   tr->src.ip6.as_u64[1] = ip6_0->src_address.as_u64[1];
 357                   tr->dst.ip6.as_u64[0] = ip6_0->dst_address.as_u64[0];
 358                   tr->dst.ip6.as_u64[1] = ip6_0->dst_address.as_u64[1];
 359                 }
 360             }
 361
 362           if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
 363             {
 364               gre_rx_trace_t *tr = vlib_add_trace (vm, node,
 365                                                    b1, sizeof (*tr));
 366               tr->tunnel_id = tunnel_sw_if_index;
 367               if (!is_ipv6)
 368                 {
 369                   tr->length = ip4_1->length;
 370                   tr->src.ip4.as_u32 = ip4_1->src_address.as_u32;
 371                   tr->dst.ip4.as_u32 = ip4_1->dst_address.as_u32;
 372                 }
 373               else
 374                 {
 375                   tr->length = ip6_1->payload_length;
 376                   tr->src.ip6.as_u64[0] = ip6_1->src_address.as_u64[0];
 377                   tr->src.ip6.as_u64[1] = ip6_1->src_address.as_u64[1];
 378                   tr->dst.ip6.as_u64[0] = ip6_1->dst_address.as_u64[0];
 379                   tr->dst.ip6.as_u64[1] = ip6_1->dst_address.as_u64[1];
 380                 }
 381             }
 382
 383           vlib_buffer_advance (b0, sizeof (*h0));
 384           vlib_buffer_advance (b1, sizeof (*h1));
 385
 386           vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
 387                                            to_next, n_left_to_next,
 388                                            bi0, bi1, next0, next1);
 389         }
 390
 391       while (n_left_from > 0 && n_left_to_next > 0)
 392         {
 393           u32 bi0;
 394           vlib_buffer_t *b0;
 395           gre_header_t *h0;
 396           ip4_header_t *ip4_0;
 397           ip6_header_t *ip6_0;
 398           u16 version0;
 399           int verr0;
 400           u32 i0, next0;
 401           gre_tunnel_key_t key0;
 402
 403           bi0 = from[0];
 404           to_next[0] = bi0;
 405           from += 1;
 406           to_next += 1;
 407           n_left_from -= 1;
 408           n_left_to_next -= 1;
 409
 410           b0 = vlib_get_buffer (vm, bi0);
 411           ip4_0 = vlib_buffer_get_current (b0);
 412           ip6_0 = (void *) ip4_0;
 413
 414           if (!is_ipv6)
 415             {
 416               vlib_buffer_advance (b0, sizeof (*ip4_0));
 417             }
 418           else
 419             {
 420               vlib_buffer_advance (b0, sizeof (*ip6_0));
 421             }
 422
 423           h0 = vlib_buffer_get_current (b0);
 424
 425           i0 = sparse_vec_index (gm->next_by_protocol, h0->protocol);
 426           next0 = vec_elt (gm->next_by_protocol, i0);
 427
 428           b0->error =
 429             node->errors[i0 == SPARSE_VEC_INVALID_INDEX
 430                          ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE];
 431
 432           version0 = clib_net_to_host_u16 (h0->flags_and_version);
 433           verr0 = version0 & GRE_VERSION_MASK;
 434           b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION]
 435             : b0->error;
 436           next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0;
 437
 438
 439           /* For IP payload we need to find source interface
 440              so we can increase counters and help forward node to
 441              pick right FIB */
 442           /* RPF check for ip4/ip6 input */
 443           if (PREDICT_TRUE (next0 == GRE_INPUT_NEXT_IP4_INPUT
 444                             || next0 == GRE_INPUT_NEXT_IP6_INPUT
 445                             || next0 == GRE_INPUT_NEXT_ETHERNET_INPUT
 446                             || next0 == GRE_INPUT_NEXT_MPLS_INPUT))
 447             {
 448               if (is_ipv6)
 449                 {
 450                   gre_mk_key6 (&ip6_0->dst_address,
 451                                &ip6_0->src_address,
 452                                vnet_buffer (b0)->ip.fib_index, &key0.gtk_v6);
 453                 }
 454               else
 455                 {
 456                   gre_mk_key4 (&ip4_0->dst_address,
 457                                &ip4_0->src_address,
 458                                vnet_buffer (b0)->ip.fib_index, &key0.gtk_v4);
 459                 }
 460
 461               if ((!is_ipv6 && !gre_match_key4 (&cached_tunnel_key.gtk_v4,
 462                                                 &key0.gtk_v4)) ||
 463                   (is_ipv6 && !gre_match_key6 (&cached_tunnel_key.gtk_v6,
 464                                                &key0.gtk_v6)))
 465                 {
 466                   gre_tunnel_t *t;
 467                   uword *p;
 468
 469                   if (!is_ipv6)
 470                     {
 471                       p = hash_get_mem (gm->tunnel_by_key4, &key0.gtk_v4);
 472                     }
 473                   else
 474                     {
 475                       p = hash_get_mem (gm->tunnel_by_key6, &key0.gtk_v6);
 476                     }
 477                   if (!p)
 478                     {
 479                       next0 = GRE_INPUT_NEXT_DROP;
 480                       b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL];
 481                       goto drop;
 482                     }
 483                   t = pool_elt_at_index (gm->tunnels, p[0]);
 484                   tunnel_sw_if_index = t->sw_if_index;
 485
 486                   cached_tunnel_sw_if_index = tunnel_sw_if_index;
 487                   if (!is_ipv6)
 488                     {
 489                       cached_tunnel_key.gtk_v4 = key0.gtk_v4;
 490                     }
 491                   else
 492                     {
 493                       cached_tunnel_key.gtk_v6 = key0.gtk_v6;
 494                     }
 495                 }
 496               else
 497                 {
 498                   tunnel_sw_if_index = cached_tunnel_sw_if_index;
 499                 }
 500             }
 501           else
 502             {
 503               next0 = GRE_INPUT_NEXT_DROP;
 504               goto drop;
 505             }
 506           len = vlib_buffer_length_in_chain (vm, b0);
 507           vlib_increment_combined_counter (im->combined_sw_if_counters
 508                                            + VNET_INTERFACE_COUNTER_RX,
 509                                            thread_index,
 510                                            tunnel_sw_if_index,
 511                                            1 /* packets */ ,
 512                                            len /* bytes */ );
 513
 514           vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
 515
 516         drop:
 517           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 518             {
 519               gre_rx_trace_t *tr = vlib_add_trace (vm, node,
 520                                                    b0, sizeof (*tr));
 521               tr->tunnel_id = tunnel_sw_if_index;
 522               if (!is_ipv6)
 523                 {
 524                   tr->length = ip4_0->length;
 525                   tr->src.ip4.as_u32 = ip4_0->src_address.as_u32;
 526                   tr->dst.ip4.as_u32 = ip4_0->dst_address.as_u32;
 527                 }
 528               else
 529                 {
 530                   tr->length = ip6_0->payload_length;
 531                   tr->src.ip6.as_u64[0] = ip6_0->src_address.as_u64[0];
 532                   tr->src.ip6.as_u64[1] = ip6_0->src_address.as_u64[1];
 533                   tr->dst.ip6.as_u64[0] = ip6_0->dst_address.as_u64[0];
 534                   tr->dst.ip6.as_u64[1] = ip6_0->dst_address.as_u64[1];
 535                 }
 536             }
 537
 538           vlib_buffer_advance (b0, sizeof (*h0));
 539
 540           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 541                                            to_next, n_left_to_next,
 542                                            bi0, next0);
 543         }
 544
 545       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 546     }
 547   vlib_node_increment_counter (vm,
 548                                !is_ipv6 ? gre4_input_node.index :
 549                                gre6_input_node.index, GRE_ERROR_PKTS_DECAP,
 550                                from_frame->n_vectors);
 551   return from_frame->n_vectors;
 552 }
 553
 554 static uword
 555 gre4_input (vlib_main_t * vm,
 556             vlib_node_runtime_t * node, vlib_frame_t * from_frame)
 557 {
 558   return gre_input (vm, node, from_frame, /* is_ip6 */ 0);
 559 }
 560
 561 static uword
 562 gre6_input (vlib_main_t * vm,
 563             vlib_node_runtime_t * node, vlib_frame_t * from_frame)
 564 {
 565   return gre_input (vm, node, from_frame, /* is_ip6 */ 1);
 566 }
 567
 568 static char *gre_error_strings[] = {
 569 #define gre_error(n,s) s,
 570 #include "error.def"
 571 #undef gre_error
 572 };
 573
 574 /* *INDENT-OFF* */
 575 VLIB_REGISTER_NODE (gre4_input_node) = {
 576   .function = gre4_input,
 577   .name = "gre4-input",
 578   /* Takes a vector of packets. */
 579   .vector_size = sizeof (u32),
 580
 581   .n_errors = GRE_N_ERROR,
 582   .error_strings = gre_error_strings,
 583
 584   .n_next_nodes = GRE_INPUT_N_NEXT,
 585   .next_nodes = {
 586 #define _(s,n) [GRE_INPUT_NEXT_##s] = n,
 587     foreach_gre_input_next
 588 #undef _
 589   },
 590
 591   .format_buffer = format_gre_header_with_length,
 592   .format_trace = format_gre_rx_trace,
 593   .unformat_buffer = unformat_gre_header,
 594 };
 595 /* *INDENT-ON* */
 596
 597 /* *INDENT-OFF* */
 598 VLIB_REGISTER_NODE (gre6_input_node) = {
 599   .function = gre6_input,
 600   .name = "gre6-input",
 601   /* Takes a vector of packets. */
 602   .vector_size = sizeof (u32),
 603
 604   .runtime_data_bytes = sizeof (gre_input_runtime_t),
 605
 606   .n_errors = GRE_N_ERROR,
 607   .error_strings = gre_error_strings,
 608
 609   .n_next_nodes = GRE_INPUT_N_NEXT,
 610   .next_nodes = {
 611 #define _(s,n) [GRE_INPUT_NEXT_##s] = n,
 612     foreach_gre_input_next
 613 #undef _
 614   },
 615
 616   .format_buffer = format_gre_header_with_length,
 617   .format_trace = format_gre_rx_trace,
 618   .unformat_buffer = unformat_gre_header,
 619 };
 620 /* *INDENT-ON* */
 621
 622 VLIB_NODE_FUNCTION_MULTIARCH (gre4_input_node, gre4_input)
 623 VLIB_NODE_FUNCTION_MULTIARCH (gre6_input_node, gre6_input)
 624      void
 625        gre_register_input_protocol (vlib_main_t * vm,
 626                                     gre_protocol_t protocol, u32 node_index)
 627 {
 628   gre_main_t *em = &gre_main;
 629   gre_protocol_info_t *pi;
 630   u16 *n;
 631   u32 i;
 632
 633   {
 634     clib_error_t *error = vlib_call_init_function (vm, gre_input_init);
 635     if (error)
 636       clib_error_report (error);
 637   }
 638
 639   pi = gre_get_protocol_info (em, protocol);
 640   pi->node_index = node_index;
 641   pi->next_index = vlib_node_add_next (vm, gre4_input_node.index, node_index);
 642   i = vlib_node_add_next (vm, gre6_input_node.index, node_index);
 643   ASSERT (i == pi->next_index);
 644
 645   /* Setup gre protocol -> next index sparse vector mapping. */
 646   n = sparse_vec_validate (em->next_by_protocol,
 647                            clib_host_to_net_u16 (protocol));
 648   n[0] = pi->next_index;
 649 }
 650
 651 static void
 652 gre_setup_node (vlib_main_t * vm, u32 node_index)
 653 {
 654   vlib_node_t *n = vlib_get_node (vm, node_index);
 655   pg_node_t *pn = pg_get_node (node_index);
 656
 657   n->format_buffer = format_gre_header_with_length;
 658   n->unformat_buffer = unformat_gre_header;
 659   pn->unformat_edit = unformat_pg_gre_header;
 660 }
 661
 662 static clib_error_t *
 663 gre_input_init (vlib_main_t * vm)
 664 {
 665   gre_main_t *gm = &gre_main;
 666   vlib_node_t *ethernet_input, *ip4_input, *ip6_input, *mpls_unicast_input;
 667
 668   {
 669     clib_error_t *error;
 670     error = vlib_call_init_function (vm, gre_init);
 671     if (error)
 672       clib_error_report (error);
 673   }
 674
 675   gre_setup_node (vm, gre4_input_node.index);
 676   gre_setup_node (vm, gre6_input_node.index);
 677
 678   gm->next_by_protocol = sparse_vec_new
 679     ( /* elt bytes */ sizeof (gm->next_by_protocol[0]),
 680      /* bits in index */ BITS (((gre_header_t *) 0)->protocol));
 681
 682   /* These could be moved to the supported protocol input node defn's */
 683   ethernet_input = vlib_get_node_by_name (vm, (u8 *) "ethernet-input");
 684   ASSERT (ethernet_input);
 685   ip4_input = vlib_get_node_by_name (vm, (u8 *) "ip4-input");
 686   ASSERT (ip4_input);
 687   ip6_input = vlib_get_node_by_name (vm, (u8 *) "ip6-input");
 688   ASSERT (ip6_input);
 689   mpls_unicast_input = vlib_get_node_by_name (vm, (u8 *) "mpls-input");
 690   ASSERT (mpls_unicast_input);
 691
 692   gre_register_input_protocol (vm, GRE_PROTOCOL_teb, ethernet_input->index);
 693
 694   gre_register_input_protocol (vm, GRE_PROTOCOL_ip4, ip4_input->index);
 695
 696   gre_register_input_protocol (vm, GRE_PROTOCOL_ip6, ip6_input->index);
 697
 698   gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast,
 699                                mpls_unicast_input->index);
 700
 701   ip4_register_protocol (IP_PROTOCOL_GRE, gre4_input_node.index);
 702   ip6_register_protocol (IP_PROTOCOL_GRE, gre6_input_node.index);
 703
 704   return 0;
 705 }
 706
 707 VLIB_INIT_FUNCTION (gre_input_init);
 708
 709 /*
 710  * fd.io coding-style-patch-verification: ON
 711  *
 712  * Local Variables:
 713  * eval: (c-set-style "gnu")
 714  * End:
 715  */