src/plugins/gtpu/gtpu_encap.c

   1 /*
   2  * Copyright (c) 2017 Intel 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 #include <vppinfra/error.h>
  16 #include <vppinfra/hash.h>
  17 #include <vnet/vnet.h>
  18 #include <vnet/ip/ip.h>
  19 #include <vnet/ethernet/ethernet.h>
  20 #include <gtpu/gtpu.h>
  21
  22 /* Statistics (not all errors) */
  23 #define foreach_gtpu_encap_error    \
  24 _(ENCAPSULATED, "good packets encapsulated")
  25
  26 static char * gtpu_encap_error_strings[] = {
  27 #define _(sym,string) string,
  28   foreach_gtpu_encap_error
  29 #undef _
  30 };
  31
  32 typedef enum {
  33 #define _(sym,str) GTPU_ENCAP_ERROR_##sym,
  34     foreach_gtpu_encap_error
  35 #undef _
  36     GTPU_ENCAP_N_ERROR,
  37 } gtpu_encap_error_t;
  38
  39 #define foreach_gtpu_encap_next        \
  40 _(DROP, "error-drop")                  \
  41 _(IP4_LOOKUP, "ip4-lookup")             \
  42 _(IP6_LOOKUP, "ip6-lookup")
  43
  44 typedef enum {
  45     GTPU_ENCAP_NEXT_DROP,
  46     GTPU_ENCAP_NEXT_IP4_LOOKUP,
  47     GTPU_ENCAP_NEXT_IP6_LOOKUP,
  48     GTPU_ENCAP_N_NEXT,
  49 } gtpu_encap_next_t;
  50
  51
  52 #define foreach_fixed_header4_offset            \
  53     _(0) _(1) _(2) _(3)
  54
  55 #define foreach_fixed_header6_offset            \
  56     _(0) _(1) _(2) _(3) _(4) _(5) _(6)
  57
  58 always_inline uword
  59 gtpu_encap_inline (vlib_main_t * vm,
  60                     vlib_node_runtime_t * node,
  61                     vlib_frame_t * from_frame,
  62                     u32 is_ip4)
  63 {
  64   u32 n_left_from, next_index, * from, * to_next;
  65   gtpu_main_t * gtm = &gtpu_main;
  66   vnet_main_t * vnm = gtm->vnet_main;
  67   vnet_interface_main_t * im = &vnm->interface_main;
  68   u32 pkts_encapsulated = 0;
  69   u16 old_l0 = 0, old_l1 = 0, old_l2 = 0, old_l3 = 0;
  70   u32 thread_index = vlib_get_thread_index();
  71   u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
  72   u32 sw_if_index0 = 0, sw_if_index1 = 0, sw_if_index2 = 0, sw_if_index3 = 0;
  73   u32 next0 = 0, next1 = 0, next2 = 0, next3 = 0;
  74   vnet_hw_interface_t * hi0, * hi1, * hi2, * hi3;
  75   gtpu_tunnel_t * t0 = NULL, * t1 = NULL, * t2 = NULL, * t3 = NULL;
  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   stats_sw_if_index = node->runtime_data[0];
  82   stats_n_packets = stats_n_bytes = 0;
  83
  84   while (n_left_from > 0)
  85     {
  86       u32 n_left_to_next;
  87
  88       vlib_get_next_frame (vm, node, next_index,
  89                            to_next, n_left_to_next);
  90
  91       while (n_left_from >= 8 && n_left_to_next >= 4)
  92         {
  93           u32 bi0, bi1, bi2, bi3;
  94           vlib_buffer_t * b0, * b1, * b2, * b3;
  95           u32 flow_hash0, flow_hash1, flow_hash2, flow_hash3;
  96           u32 len0, len1, len2, len3;
  97           ip4_header_t * ip4_0, * ip4_1, * ip4_2, * ip4_3;
  98           ip6_header_t * ip6_0, * ip6_1, * ip6_2, * ip6_3;
  99           udp_header_t * udp0, * udp1, * udp2, * udp3;
 100           gtpu_header_t * gtpu0, * gtpu1, * gtpu2, * gtpu3;
 101           u64 * copy_src0, * copy_dst0;
 102           u64 * copy_src1, * copy_dst1;
 103           u64 * copy_src2, * copy_dst2;
 104           u64 * copy_src3, * copy_dst3;
 105           u32 * copy_src_last0, * copy_dst_last0;
 106           u32 * copy_src_last1, * copy_dst_last1;
 107           u32 * copy_src_last2, * copy_dst_last2;
 108           u32 * copy_src_last3, * copy_dst_last3;
 109           u16 new_l0, new_l1, new_l2, new_l3;
 110           ip_csum_t sum0, sum1, sum2, sum3;
 111
 112           /* Prefetch next iteration. */
 113           {
 114             vlib_buffer_t * p4, * p5, * p6, * p7;
 115
 116             p4 = vlib_get_buffer (vm, from[4]);
 117             p5 = vlib_get_buffer (vm, from[5]);
 118             p6 = vlib_get_buffer (vm, from[6]);
 119             p7 = vlib_get_buffer (vm, from[7]);
 120
 121             vlib_prefetch_buffer_header (p4, LOAD);
 122             vlib_prefetch_buffer_header (p5, LOAD);
 123             vlib_prefetch_buffer_header (p6, LOAD);
 124             vlib_prefetch_buffer_header (p7, LOAD);
 125
 126             CLIB_PREFETCH (p4->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
 127             CLIB_PREFETCH (p5->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
 128             CLIB_PREFETCH (p6->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
 129             CLIB_PREFETCH (p7->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
 130           }
 131
 132           bi0 = from[0];
 133           bi1 = from[1];
 134           bi2 = from[2];
 135           bi3 = from[3];
 136           to_next[0] = bi0;
 137           to_next[1] = bi1;
 138           to_next[2] = bi2;
 139           to_next[3] = bi3;
 140           from += 4;
 141           to_next += 4;
 142           n_left_to_next -= 4;
 143           n_left_from -= 4;
 144
 145           b0 = vlib_get_buffer (vm, bi0);
 146           b1 = vlib_get_buffer (vm, bi1);
 147           b2 = vlib_get_buffer (vm, bi2);
 148           b3 = vlib_get_buffer (vm, bi3);
 149
 150           flow_hash0 = vnet_l2_compute_flow_hash (b0);
 151           flow_hash1 = vnet_l2_compute_flow_hash (b1);
 152           flow_hash2 = vnet_l2_compute_flow_hash (b2);
 153           flow_hash3 = vnet_l2_compute_flow_hash (b3);
 154
 155           /* Get next node index and adj index from tunnel next_dpo */
 156           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
 157           sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
 158           sw_if_index2 = vnet_buffer(b2)->sw_if_index[VLIB_TX];
 159           sw_if_index3 = vnet_buffer(b3)->sw_if_index[VLIB_TX];
 160           hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
 161           hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
 162           hi2 = vnet_get_sup_hw_interface (vnm, sw_if_index2);
 163           hi3 = vnet_get_sup_hw_interface (vnm, sw_if_index3);
 164           t0 = &gtm->tunnels[hi0->dev_instance];
 165           t1 = &gtm->tunnels[hi1->dev_instance];
 166           t2 = &gtm->tunnels[hi2->dev_instance];
 167           t3 = &gtm->tunnels[hi3->dev_instance];
 168
 169           /* Note: change to always set next0 if it may be set to drop */
 170           next0 = t0->next_dpo.dpoi_next_node;
 171           vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
 172           next1 = t1->next_dpo.dpoi_next_node;
 173           vnet_buffer(b1)->ip.adj_index[VLIB_TX] = t1->next_dpo.dpoi_index;
 174           next2 = t2->next_dpo.dpoi_next_node;
 175           vnet_buffer(b2)->ip.adj_index[VLIB_TX] = t2->next_dpo.dpoi_index;
 176           next3 = t3->next_dpo.dpoi_next_node;
 177           vnet_buffer(b3)->ip.adj_index[VLIB_TX] = t3->next_dpo.dpoi_index;
 178
 179           /* Apply the rewrite string. $$$$ vnet_rewrite? */
 180           vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
 181           vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite));
 182           vlib_buffer_advance (b2, -(word)_vec_len(t2->rewrite));
 183           vlib_buffer_advance (b3, -(word)_vec_len(t3->rewrite));
 184
 185           if (is_ip4)
 186             {
 187               ip4_0 = vlib_buffer_get_current(b0);
 188               ip4_1 = vlib_buffer_get_current(b1);
 189               ip4_2 = vlib_buffer_get_current(b2);
 190               ip4_3 = vlib_buffer_get_current(b3);
 191
 192               /* Copy the fixed header */
 193               copy_dst0 = (u64 *) ip4_0;
 194               copy_src0 = (u64 *) t0->rewrite;
 195               copy_dst1 = (u64 *) ip4_1;
 196               copy_src1 = (u64 *) t1->rewrite;
 197               copy_dst2 = (u64 *) ip4_2;
 198               copy_src2 = (u64 *) t2->rewrite;
 199               copy_dst3 = (u64 *) ip4_3;
 200               copy_src3 = (u64 *) t3->rewrite;
 201
 202               /* Copy first 32 octets 8-bytes at a time */
 203 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 204               foreach_fixed_header4_offset;
 205 #undef _
 206 #define _(offs) copy_dst1[offs] = copy_src1[offs];
 207               foreach_fixed_header4_offset;
 208 #undef _
 209 #define _(offs) copy_dst2[offs] = copy_src2[offs];
 210               foreach_fixed_header4_offset;
 211 #undef _
 212 #define _(offs) copy_dst3[offs] = copy_src3[offs];
 213               foreach_fixed_header4_offset;
 214 #undef _
 215               /* Last 4 octets. Hopefully gcc will be our friend */
 216               copy_dst_last0 = (u32 *)(&copy_dst0[4]);
 217               copy_src_last0 = (u32 *)(&copy_src0[4]);
 218               copy_dst_last0[0] = copy_src_last0[0];
 219               copy_dst_last1 = (u32 *)(&copy_dst1[4]);
 220               copy_src_last1 = (u32 *)(&copy_src1[4]);
 221               copy_dst_last1[0] = copy_src_last1[0];
 222               copy_dst_last2 = (u32 *)(&copy_dst2[4]);
 223               copy_src_last2 = (u32 *)(&copy_src2[4]);
 224               copy_dst_last2[0] = copy_src_last2[0];
 225               copy_dst_last3 = (u32 *)(&copy_dst3[4]);
 226               copy_src_last3 = (u32 *)(&copy_src3[4]);
 227               copy_dst_last3[0] = copy_src_last3[0];
 228
 229               /* Fix the IP4 checksum and length */
 230               sum0 = ip4_0->checksum;
 231               new_l0 = /* old_l0 always 0, see the rewrite setup */
 232                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
 233               sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
 234                                      length /* changed member */);
 235               ip4_0->checksum = ip_csum_fold (sum0);
 236               ip4_0->length = new_l0;
 237               sum1 = ip4_1->checksum;
 238               new_l1 = /* old_l1 always 0, see the rewrite setup */
 239                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
 240               sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
 241                                      length /* changed member */);
 242               ip4_1->checksum = ip_csum_fold (sum1);
 243               ip4_1->length = new_l1;
 244               sum2 = ip4_2->checksum;
 245               new_l2 = /* old_l0 always 0, see the rewrite setup */
 246                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b2));
 247               sum2 = ip_csum_update (sum2, old_l2, new_l2, ip4_header_t,
 248                                      length /* changed member */);
 249               ip4_2->checksum = ip_csum_fold (sum2);
 250               ip4_2->length = new_l2;
 251               sum3 = ip4_3->checksum;
 252               new_l3 = /* old_l1 always 0, see the rewrite setup */
 253                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b3));
 254               sum3 = ip_csum_update (sum3, old_l3, new_l3, ip4_header_t,
 255                                      length /* changed member */);
 256               ip4_3->checksum = ip_csum_fold (sum3);
 257               ip4_3->length = new_l3;
 258
 259               /* Fix UDP length and set source port */
 260               udp0 = (udp_header_t *)(ip4_0+1);
 261               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 262                                              - sizeof (*ip4_0));
 263               udp0->length = new_l0;
 264               udp0->src_port = flow_hash0;
 265               udp1 = (udp_header_t *)(ip4_1+1);
 266               new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
 267                                              - sizeof (*ip4_1));
 268               udp1->length = new_l1;
 269               udp1->src_port = flow_hash1;
 270               udp2 = (udp_header_t *)(ip4_2+1);
 271               new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
 272                                              - sizeof (*ip4_2));
 273               udp2->length = new_l2;
 274               udp2->src_port = flow_hash2;
 275               udp3 = (udp_header_t *)(ip4_3+1);
 276               new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
 277                                              - sizeof (*ip4_3));
 278               udp3->length = new_l3;
 279               udp3->src_port = flow_hash3;
 280
 281               /* Fix GTPU length */
 282               gtpu0 = (gtpu_header_t *)(udp0+1);
 283               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 284                                              - sizeof (*ip4_0) - sizeof(*udp0)
 285                                              - GTPU_V1_HDR_LEN);
 286               gtpu0->length = new_l0;
 287               gtpu1 = (gtpu_header_t *)(udp1+1);
 288               new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
 289                                              - sizeof (*ip4_1) - sizeof(*udp1)
 290                                              - GTPU_V1_HDR_LEN);
 291               gtpu1->length = new_l1;
 292               gtpu2 = (gtpu_header_t *)(udp2+1);
 293               new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
 294                                              - sizeof (*ip4_2) - sizeof(*udp2)
 295                                              - GTPU_V1_HDR_LEN);
 296               gtpu2->length = new_l2;
 297               gtpu3 = (gtpu_header_t *)(udp3+1);
 298               new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
 299                                              - sizeof (*ip4_3) - sizeof(*udp3)
 300                                              - GTPU_V1_HDR_LEN);
 301               gtpu3->length = new_l3;
 302             }
 303           else /* ipv6 */
 304             {
 305               int bogus = 0;
 306
 307               ip6_0 = vlib_buffer_get_current(b0);
 308               ip6_1 = vlib_buffer_get_current(b1);
 309               ip6_2 = vlib_buffer_get_current(b2);
 310               ip6_3 = vlib_buffer_get_current(b3);
 311
 312               /* Copy the fixed header */
 313               copy_dst0 = (u64 *) ip6_0;
 314               copy_src0 = (u64 *) t0->rewrite;
 315               copy_dst1 = (u64 *) ip6_1;
 316               copy_src1 = (u64 *) t1->rewrite;
 317               copy_dst2 = (u64 *) ip6_2;
 318               copy_src2 = (u64 *) t2->rewrite;
 319               copy_dst3 = (u64 *) ip6_3;
 320               copy_src3 = (u64 *) t3->rewrite;
 321               /* Copy first 56 (ip6) octets 8-bytes at a time */
 322 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 323               foreach_fixed_header6_offset;
 324 #undef _
 325 #define _(offs) copy_dst1[offs] = copy_src1[offs];
 326               foreach_fixed_header6_offset;
 327 #undef _
 328 #define _(offs) copy_dst2[offs] = copy_src2[offs];
 329               foreach_fixed_header6_offset;
 330 #undef _
 331 #define _(offs) copy_dst3[offs] = copy_src3[offs];
 332               foreach_fixed_header6_offset;
 333 #undef _
 334               /* Fix IP6 payload length */
 335               new_l0 =
 336                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
 337                                       - sizeof(*ip6_0));
 338               ip6_0->payload_length = new_l0;
 339               new_l1 =
 340                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
 341                                       - sizeof(*ip6_1));
 342               ip6_1->payload_length = new_l1;
 343               new_l2 =
 344                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b2)
 345                                       - sizeof(*ip6_2));
 346               ip6_2->payload_length = new_l2;
 347               new_l3 =
 348                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b3)
 349                                       - sizeof(*ip6_3));
 350               ip6_3->payload_length = new_l3;
 351
 352               /* Fix UDP length  and set source port */
 353               udp0 = (udp_header_t *)(ip6_0+1);
 354               udp0->length = new_l0;
 355               udp0->src_port = flow_hash0;
 356               udp1 = (udp_header_t *)(ip6_1+1);
 357               udp1->length = new_l1;
 358               udp1->src_port = flow_hash1;
 359               udp2 = (udp_header_t *)(ip6_2+1);
 360               udp2->length = new_l2;
 361               udp2->src_port = flow_hash2;
 362               udp3 = (udp_header_t *)(ip6_3+1);
 363               udp3->length = new_l3;
 364               udp3->src_port = flow_hash3;
 365
 366               /* Fix GTPU length */
 367               gtpu0 = (gtpu_header_t *)(udp0+1);
 368               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 369                                              - sizeof (*ip6_0) - sizeof(*udp0)
 370                                              - GTPU_V1_HDR_LEN);
 371               gtpu0->length = new_l0;
 372               gtpu1 = (gtpu_header_t *)(udp1+1);
 373               new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
 374                                              - sizeof (*ip6_1) - sizeof(*udp1)
 375                                              - GTPU_V1_HDR_LEN);
 376               gtpu1->length = new_l1;
 377               gtpu2 = (gtpu_header_t *)(udp2+1);
 378               new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
 379                                              - sizeof (*ip6_2) - sizeof(*udp2)
 380                                              - GTPU_V1_HDR_LEN);
 381               gtpu2->length = new_l2;
 382               gtpu3 = (gtpu_header_t *)(udp3+1);
 383               new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
 384                                              - sizeof (*ip6_3) - sizeof(*udp3)
 385                                              - GTPU_V1_HDR_LEN);
 386               gtpu3->length = new_l3;
 387
 388               /* IPv6 UDP checksum is mandatory */
 389               udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0,
 390                                                                  ip6_0, &bogus);
 391               if (udp0->checksum == 0)
 392                 udp0->checksum = 0xffff;
 393               udp1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b1,
 394                                                                  ip6_1, &bogus);
 395               if (udp1->checksum == 0)
 396                 udp1->checksum = 0xffff;
 397               udp2->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b2,
 398                                                                  ip6_2, &bogus);
 399               if (udp2->checksum == 0)
 400                 udp2->checksum = 0xffff;
 401               udp3->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b3,
 402                                                                  ip6_3, &bogus);
 403               if (udp3->checksum == 0)
 404                 udp3->checksum = 0xffff;
 405
 406             }
 407
 408           pkts_encapsulated += 4;
 409           len0 = vlib_buffer_length_in_chain (vm, b0);
 410           len1 = vlib_buffer_length_in_chain (vm, b1);
 411           len2 = vlib_buffer_length_in_chain (vm, b2);
 412           len3 = vlib_buffer_length_in_chain (vm, b3);
 413           stats_n_packets += 4;
 414           stats_n_bytes += len0 + len1 + len2 + len3;
 415
 416           /* Batch stats increment on the same gtpu tunnel so counter is not
 417              incremented per packet. Note stats are still incremented for deleted
 418              and admin-down tunnel where packets are dropped. It is not worthwhile
 419              to check for this rare case and affect normal path performance. */
 420           if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
 421                              (sw_if_index1 != stats_sw_if_index) ||
 422                              (sw_if_index2 != stats_sw_if_index) ||
 423                              (sw_if_index3 != stats_sw_if_index) ))
 424             {
 425               stats_n_packets -= 4;
 426               stats_n_bytes -= len0 + len1 + len2 + len3;
 427               if ( (sw_if_index0 == sw_if_index1 ) &&
 428                    (sw_if_index1 == sw_if_index2 ) &&
 429                    (sw_if_index2 == sw_if_index3 ) )
 430                 {
 431                   if (stats_n_packets)
 432                     vlib_increment_combined_counter
 433                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 434                        thread_index, stats_sw_if_index,
 435                        stats_n_packets, stats_n_bytes);
 436                   stats_sw_if_index = sw_if_index0;
 437                   stats_n_packets = 4;
 438                   stats_n_bytes = len0 + len1 + len2 + len3;
 439                 }
 440               else
 441                 {
 442                   vlib_increment_combined_counter
 443                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 444                        thread_index, sw_if_index0, 1, len0);
 445                   vlib_increment_combined_counter
 446                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 447                        thread_index, sw_if_index1, 1, len1);
 448                   vlib_increment_combined_counter
 449                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 450                        thread_index, sw_if_index2, 1, len2);
 451                   vlib_increment_combined_counter
 452                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 453                        thread_index, sw_if_index3, 1, len3);
 454                 }
 455             }
 456
 457           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 458             {
 459               gtpu_encap_trace_t *tr =
 460                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 461               tr->tunnel_index = t0 - gtm->tunnels;
 462               tr->teid = t0->teid;
 463            }
 464
 465           if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
 466             {
 467               gtpu_encap_trace_t *tr =
 468                 vlib_add_trace (vm, node, b1, sizeof (*tr));
 469               tr->tunnel_index = t1 - gtm->tunnels;
 470               tr->teid = t1->teid;
 471             }
 472
 473           vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
 474                                            to_next, n_left_to_next,
 475                                            bi0, bi1, bi2, bi3,
 476                                            next0, next1, next2, next3);
 477         }
 478
 479       while (n_left_from > 0 && n_left_to_next > 0)
 480         {
 481           u32 bi0;
 482           vlib_buffer_t * b0;
 483           u32 flow_hash0;
 484           u32 len0;
 485           ip4_header_t * ip4_0;
 486           ip6_header_t * ip6_0;
 487           udp_header_t * udp0;
 488           gtpu_header_t * gtpu0;
 489           u64 * copy_src0, * copy_dst0;
 490           u32 * copy_src_last0, * copy_dst_last0;
 491           u16 new_l0;
 492           ip_csum_t sum0;
 493
 494           bi0 = from[0];
 495           to_next[0] = bi0;
 496           from += 1;
 497           to_next += 1;
 498           n_left_from -= 1;
 499           n_left_to_next -= 1;
 500
 501           b0 = vlib_get_buffer (vm, bi0);
 502
 503           flow_hash0 = vnet_l2_compute_flow_hash(b0);
 504
 505           /* Get next node index and adj index from tunnel next_dpo */
 506           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
 507           hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
 508           t0 = &gtm->tunnels[hi0->dev_instance];
 509           /* Note: change to always set next0 if it may be set to drop */
 510           next0 = t0->next_dpo.dpoi_next_node;
 511           vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
 512
 513           /* Apply the rewrite string. $$$$ vnet_rewrite? */
 514           vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
 515
 516           if (is_ip4)
 517             {
 518               ip4_0 = vlib_buffer_get_current(b0);
 519
 520               /* Copy the fixed header */
 521               copy_dst0 = (u64 *) ip4_0;
 522               copy_src0 = (u64 *) t0->rewrite;
 523               /* Copy first 32 octets 8-bytes at a time */
 524 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 525               foreach_fixed_header4_offset;
 526 #undef _
 527               /* Last 4 octets. Hopefully gcc will be our friend */
 528               copy_dst_last0 = (u32 *)(&copy_dst0[4]);
 529               copy_src_last0 = (u32 *)(&copy_src0[4]);
 530               copy_dst_last0[0] = copy_src_last0[0];
 531
 532               /* Fix the IP4 checksum and length */
 533               sum0 = ip4_0->checksum;
 534               new_l0 = /* old_l0 always 0, see the rewrite setup */
 535                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
 536               sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
 537                                      length /* changed member */);
 538               ip4_0->checksum = ip_csum_fold (sum0);
 539               ip4_0->length = new_l0;
 540
 541               /* Fix UDP length and set source port */
 542               udp0 = (udp_header_t *)(ip4_0+1);
 543               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 544                                              - sizeof (*ip4_0));
 545               udp0->length = new_l0;
 546               udp0->src_port = flow_hash0;
 547
 548               /* Fix GTPU length */
 549               gtpu0 = (gtpu_header_t *)(udp0+1);
 550               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 551                                              - sizeof (*ip4_0) - sizeof(*udp0)
 552                                              - GTPU_V1_HDR_LEN);
 553               gtpu0->length = new_l0;
 554             }
 555
 556           else /* ip6 path */
 557             {
 558               int bogus = 0;
 559
 560               ip6_0 = vlib_buffer_get_current(b0);
 561               /* Copy the fixed header */
 562               copy_dst0 = (u64 *) ip6_0;
 563               copy_src0 = (u64 *) t0->rewrite;
 564               /* Copy first 56 (ip6) octets 8-bytes at a time */
 565 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 566               foreach_fixed_header6_offset;
 567 #undef _
 568               /* Fix IP6 payload length */
 569               new_l0 =
 570                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
 571                                       - sizeof(*ip6_0));
 572               ip6_0->payload_length = new_l0;
 573
 574               /* Fix UDP length  and set source port */
 575               udp0 = (udp_header_t *)(ip6_0+1);
 576               udp0->length = new_l0;
 577               udp0->src_port = flow_hash0;
 578
 579               /* Fix GTPU length */
 580               gtpu0 = (gtpu_header_t *)(udp0+1);
 581               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 582                                              - sizeof (*ip4_0) - sizeof(*udp0)
 583                                              - GTPU_V1_HDR_LEN);
 584               gtpu0->length = new_l0;
 585
 586               /* IPv6 UDP checksum is mandatory */
 587               udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0,
 588                                                                  ip6_0, &bogus);
 589               if (udp0->checksum == 0)
 590                 udp0->checksum = 0xffff;
 591             }
 592
 593           pkts_encapsulated ++;
 594           len0 = vlib_buffer_length_in_chain (vm, b0);
 595           stats_n_packets += 1;
 596           stats_n_bytes += len0;
 597
 598           /* Batch stats increment on the same gtpu tunnel so counter is not
 599              incremented per packet. Note stats are still incremented for deleted
 600              and admin-down tunnel where packets are dropped. It is not worthwhile
 601              to check for this rare case and affect normal path performance. */
 602           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 603             {
 604               stats_n_packets -= 1;
 605               stats_n_bytes -= len0;
 606               if (stats_n_packets)
 607                 vlib_increment_combined_counter
 608                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 609                    thread_index, stats_sw_if_index,
 610                    stats_n_packets, stats_n_bytes);
 611               stats_n_packets = 1;
 612               stats_n_bytes = len0;
 613               stats_sw_if_index = sw_if_index0;
 614             }
 615
 616           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 617             {
 618               gtpu_encap_trace_t *tr =
 619                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 620               tr->tunnel_index = t0 - gtm->tunnels;
 621               tr->teid = t0->teid;
 622             }
 623           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 624                                            to_next, n_left_to_next,
 625                                            bi0, next0);
 626         }
 627
 628       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 629     }
 630
 631   /* Do we still need this now that tunnel tx stats is kept? */
 632   vlib_node_increment_counter (vm, node->node_index,
 633                                GTPU_ENCAP_ERROR_ENCAPSULATED,
 634                                pkts_encapsulated);
 635
 636   /* Increment any remaining batch stats */
 637   if (stats_n_packets)
 638     {
 639       vlib_increment_combined_counter
 640         (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 641          thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
 642       node->runtime_data[0] = stats_sw_if_index;
 643     }
 644
 645   return from_frame->n_vectors;
 646 }
 647
 648 VLIB_NODE_FN (gtpu4_encap_node) (vlib_main_t * vm,
 649               vlib_node_runtime_t * node,
 650               vlib_frame_t * from_frame)
 651 {
 652   return gtpu_encap_inline (vm, node, from_frame, /* is_ip4 */ 1);
 653 }
 654
 655 VLIB_NODE_FN (gtpu6_encap_node) (vlib_main_t * vm,
 656               vlib_node_runtime_t * node,
 657               vlib_frame_t * from_frame)
 658 {
 659   return gtpu_encap_inline (vm, node, from_frame, /* is_ip4 */ 0);
 660 }
 661
 662 VLIB_REGISTER_NODE (gtpu4_encap_node) = {
 663   .name = "gtpu4-encap",
 664   .vector_size = sizeof (u32),
 665   .format_trace = format_gtpu_encap_trace,
 666   .type = VLIB_NODE_TYPE_INTERNAL,
 667   .n_errors = ARRAY_LEN(gtpu_encap_error_strings),
 668   .error_strings = gtpu_encap_error_strings,
 669   .n_next_nodes = GTPU_ENCAP_N_NEXT,
 670   .next_nodes = {
 671 #define _(s,n) [GTPU_ENCAP_NEXT_##s] = n,
 672     foreach_gtpu_encap_next
 673 #undef _
 674   },
 675 };
 676
 677 VLIB_REGISTER_NODE (gtpu6_encap_node) = {
 678   .name = "gtpu6-encap",
 679   .vector_size = sizeof (u32),
 680   .format_trace = format_gtpu_encap_trace,
 681   .type = VLIB_NODE_TYPE_INTERNAL,
 682   .n_errors = ARRAY_LEN(gtpu_encap_error_strings),
 683   .error_strings = gtpu_encap_error_strings,
 684   .n_next_nodes = GTPU_ENCAP_N_NEXT,
 685   .next_nodes = {
 686 #define _(s,n) [GTPU_ENCAP_NEXT_##s] = n,
 687     foreach_gtpu_encap_next
 688 #undef _
 689   },
 690 };
 691