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 typedef struct {
  52   u32 tunnel_index;
  53   u32 teid;
  54 } gtpu_encap_trace_t;
  55
  56 u8 * format_gtpu_encap_trace (u8 * s, va_list * args)
  57 {
  58   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  59   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  60   gtpu_encap_trace_t * t
  61       = va_arg (*args, gtpu_encap_trace_t *);
  62
  63   s = format (s, "GTPU encap to gtpu_tunnel%d teid %d",
  64               t->tunnel_index, t->teid);
  65   return s;
  66 }
  67
  68
  69 #define foreach_fixed_header4_offset            \
  70     _(0) _(1) _(2) _(3)
  71
  72 #define foreach_fixed_header6_offset            \
  73     _(0) _(1) _(2) _(3) _(4) _(5) _(6)
  74
  75 always_inline uword
  76 gtpu_encap_inline (vlib_main_t * vm,
  77                     vlib_node_runtime_t * node,
  78                     vlib_frame_t * from_frame,
  79                     u32 is_ip4)
  80 {
  81   u32 n_left_from, next_index, * from, * to_next;
  82   gtpu_main_t * gtm = &gtpu_main;
  83   vnet_main_t * vnm = gtm->vnet_main;
  84   vnet_interface_main_t * im = &vnm->interface_main;
  85   u32 pkts_encapsulated = 0;
  86   u16 old_l0 = 0, old_l1 = 0, old_l2 = 0, old_l3 = 0;
  87   u32 thread_index = vlib_get_thread_index();
  88   u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
  89   u32 sw_if_index0 = 0, sw_if_index1 = 0, sw_if_index2 = 0, sw_if_index3 = 0;
  90   u32 next0 = 0, next1 = 0, next2 = 0, next3 = 0;
  91   vnet_hw_interface_t * hi0, * hi1, * hi2, * hi3;
  92   gtpu_tunnel_t * t0 = NULL, * t1 = NULL, * t2 = NULL, * t3 = NULL;
  93
  94   from = vlib_frame_vector_args (from_frame);
  95   n_left_from = from_frame->n_vectors;
  96
  97   next_index = node->cached_next_index;
  98   stats_sw_if_index = node->runtime_data[0];
  99   stats_n_packets = stats_n_bytes = 0;
 100
 101   while (n_left_from > 0)
 102     {
 103       u32 n_left_to_next;
 104
 105       vlib_get_next_frame (vm, node, next_index,
 106                            to_next, n_left_to_next);
 107
 108       while (n_left_from >= 8 && n_left_to_next >= 4)
 109         {
 110           u32 bi0, bi1, bi2, bi3;
 111           vlib_buffer_t * b0, * b1, * b2, * b3;
 112           u32 flow_hash0, flow_hash1, flow_hash2, flow_hash3;
 113           u32 len0, len1, len2, len3;
 114           ip4_header_t * ip4_0, * ip4_1, * ip4_2, * ip4_3;
 115           ip6_header_t * ip6_0, * ip6_1, * ip6_2, * ip6_3;
 116           udp_header_t * udp0, * udp1, * udp2, * udp3;
 117           gtpu_header_t * gtpu0, * gtpu1, * gtpu2, * gtpu3;
 118           u64 * copy_src0, * copy_dst0;
 119           u64 * copy_src1, * copy_dst1;
 120           u64 * copy_src2, * copy_dst2;
 121           u64 * copy_src3, * copy_dst3;
 122           u32 * copy_src_last0, * copy_dst_last0;
 123           u32 * copy_src_last1, * copy_dst_last1;
 124           u32 * copy_src_last2, * copy_dst_last2;
 125           u32 * copy_src_last3, * copy_dst_last3;
 126           u16 new_l0, new_l1, new_l2, new_l3;
 127           ip_csum_t sum0, sum1, sum2, sum3;
 128
 129           /* Prefetch next iteration. */
 130           {
 131             vlib_buffer_t * p4, * p5, * p6, * p7;
 132
 133             p4 = vlib_get_buffer (vm, from[4]);
 134             p5 = vlib_get_buffer (vm, from[5]);
 135             p6 = vlib_get_buffer (vm, from[6]);
 136             p7 = vlib_get_buffer (vm, from[7]);
 137
 138             vlib_prefetch_buffer_header (p4, LOAD);
 139             vlib_prefetch_buffer_header (p5, LOAD);
 140             vlib_prefetch_buffer_header (p6, LOAD);
 141             vlib_prefetch_buffer_header (p7, LOAD);
 142
 143             CLIB_PREFETCH (p4->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
 144             CLIB_PREFETCH (p5->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
 145             CLIB_PREFETCH (p6->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
 146             CLIB_PREFETCH (p7->data, 2*CLIB_CACHE_LINE_BYTES, LOAD);
 147           }
 148
 149           bi0 = from[0];
 150           bi1 = from[1];
 151           bi2 = from[2];
 152           bi3 = from[3];
 153           to_next[0] = bi0;
 154           to_next[1] = bi1;
 155           to_next[2] = bi2;
 156           to_next[3] = bi3;
 157           from += 4;
 158           to_next += 4;
 159           n_left_to_next -= 4;
 160           n_left_from -= 4;
 161
 162           b0 = vlib_get_buffer (vm, bi0);
 163           b1 = vlib_get_buffer (vm, bi1);
 164           b2 = vlib_get_buffer (vm, bi2);
 165           b3 = vlib_get_buffer (vm, bi3);
 166
 167           flow_hash0 = vnet_l2_compute_flow_hash (b0);
 168           flow_hash1 = vnet_l2_compute_flow_hash (b1);
 169           flow_hash2 = vnet_l2_compute_flow_hash (b2);
 170           flow_hash3 = vnet_l2_compute_flow_hash (b3);
 171
 172           /* Get next node index and adj index from tunnel next_dpo */
 173           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
 174           sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX];
 175           sw_if_index2 = vnet_buffer(b2)->sw_if_index[VLIB_TX];
 176           sw_if_index3 = vnet_buffer(b3)->sw_if_index[VLIB_TX];
 177           hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
 178           hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1);
 179           hi2 = vnet_get_sup_hw_interface (vnm, sw_if_index2);
 180           hi3 = vnet_get_sup_hw_interface (vnm, sw_if_index3);
 181           t0 = &gtm->tunnels[hi0->dev_instance];
 182           t1 = &gtm->tunnels[hi1->dev_instance];
 183           t2 = &gtm->tunnels[hi2->dev_instance];
 184           t3 = &gtm->tunnels[hi3->dev_instance];
 185
 186           /* Note: change to always set next0 if it may be set to drop */
 187           next0 = t0->next_dpo.dpoi_next_node;
 188           vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
 189           next1 = t1->next_dpo.dpoi_next_node;
 190           vnet_buffer(b1)->ip.adj_index[VLIB_TX] = t1->next_dpo.dpoi_index;
 191           next2 = t2->next_dpo.dpoi_next_node;
 192           vnet_buffer(b2)->ip.adj_index[VLIB_TX] = t2->next_dpo.dpoi_index;
 193           next3 = t3->next_dpo.dpoi_next_node;
 194           vnet_buffer(b3)->ip.adj_index[VLIB_TX] = t3->next_dpo.dpoi_index;
 195
 196           /* Apply the rewrite string. $$$$ vnet_rewrite? */
 197           vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
 198           vlib_buffer_advance (b1, -(word)_vec_len(t1->rewrite));
 199           vlib_buffer_advance (b2, -(word)_vec_len(t2->rewrite));
 200           vlib_buffer_advance (b3, -(word)_vec_len(t3->rewrite));
 201
 202           if (is_ip4)
 203             {
 204               ip4_0 = vlib_buffer_get_current(b0);
 205               ip4_1 = vlib_buffer_get_current(b1);
 206               ip4_2 = vlib_buffer_get_current(b2);
 207               ip4_3 = vlib_buffer_get_current(b3);
 208
 209               /* Copy the fixed header */
 210               copy_dst0 = (u64 *) ip4_0;
 211               copy_src0 = (u64 *) t0->rewrite;
 212               copy_dst1 = (u64 *) ip4_1;
 213               copy_src1 = (u64 *) t1->rewrite;
 214               copy_dst2 = (u64 *) ip4_2;
 215               copy_src2 = (u64 *) t2->rewrite;
 216               copy_dst3 = (u64 *) ip4_3;
 217               copy_src3 = (u64 *) t3->rewrite;
 218
 219               /* Copy first 32 octets 8-bytes at a time */
 220 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 221               foreach_fixed_header4_offset;
 222 #undef _
 223 #define _(offs) copy_dst1[offs] = copy_src1[offs];
 224               foreach_fixed_header4_offset;
 225 #undef _
 226 #define _(offs) copy_dst2[offs] = copy_src2[offs];
 227               foreach_fixed_header4_offset;
 228 #undef _
 229 #define _(offs) copy_dst3[offs] = copy_src3[offs];
 230               foreach_fixed_header4_offset;
 231 #undef _
 232               /* Last 4 octets. Hopefully gcc will be our friend */
 233               copy_dst_last0 = (u32 *)(&copy_dst0[4]);
 234               copy_src_last0 = (u32 *)(&copy_src0[4]);
 235               copy_dst_last0[0] = copy_src_last0[0];
 236               copy_dst_last1 = (u32 *)(&copy_dst1[4]);
 237               copy_src_last1 = (u32 *)(&copy_src1[4]);
 238               copy_dst_last1[0] = copy_src_last1[0];
 239               copy_dst_last2 = (u32 *)(&copy_dst2[4]);
 240               copy_src_last2 = (u32 *)(&copy_src2[4]);
 241               copy_dst_last2[0] = copy_src_last2[0];
 242               copy_dst_last3 = (u32 *)(&copy_dst3[4]);
 243               copy_src_last3 = (u32 *)(&copy_src3[4]);
 244               copy_dst_last3[0] = copy_src_last3[0];
 245
 246               /* Fix the IP4 checksum and length */
 247               sum0 = ip4_0->checksum;
 248               new_l0 = /* old_l0 always 0, see the rewrite setup */
 249                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
 250               sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
 251                                      length /* changed member */);
 252               ip4_0->checksum = ip_csum_fold (sum0);
 253               ip4_0->length = new_l0;
 254               sum1 = ip4_1->checksum;
 255               new_l1 = /* old_l1 always 0, see the rewrite setup */
 256                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
 257               sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
 258                                      length /* changed member */);
 259               ip4_1->checksum = ip_csum_fold (sum1);
 260               ip4_1->length = new_l1;
 261               sum2 = ip4_2->checksum;
 262               new_l2 = /* old_l0 always 0, see the rewrite setup */
 263                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b2));
 264               sum2 = ip_csum_update (sum2, old_l2, new_l2, ip4_header_t,
 265                                      length /* changed member */);
 266               ip4_2->checksum = ip_csum_fold (sum2);
 267               ip4_2->length = new_l2;
 268               sum3 = ip4_3->checksum;
 269               new_l3 = /* old_l1 always 0, see the rewrite setup */
 270                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b3));
 271               sum3 = ip_csum_update (sum3, old_l3, new_l3, ip4_header_t,
 272                                      length /* changed member */);
 273               ip4_3->checksum = ip_csum_fold (sum3);
 274               ip4_3->length = new_l3;
 275
 276               /* Fix UDP length and set source port */
 277               udp0 = (udp_header_t *)(ip4_0+1);
 278               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 279                                              - sizeof (*ip4_0));
 280               udp0->length = new_l0;
 281               udp0->src_port = flow_hash0;
 282               udp1 = (udp_header_t *)(ip4_1+1);
 283               new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
 284                                              - sizeof (*ip4_1));
 285               udp1->length = new_l1;
 286               udp1->src_port = flow_hash1;
 287               udp2 = (udp_header_t *)(ip4_2+1);
 288               new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
 289                                              - sizeof (*ip4_2));
 290               udp2->length = new_l2;
 291               udp2->src_port = flow_hash2;
 292               udp3 = (udp_header_t *)(ip4_3+1);
 293               new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
 294                                              - sizeof (*ip4_3));
 295               udp3->length = new_l3;
 296               udp3->src_port = flow_hash3;
 297
 298               /* Fix GTPU length */
 299               gtpu0 = (gtpu_header_t *)(udp0+1);
 300               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 301                                              - sizeof (*ip4_0) - sizeof(*udp0)
 302                                              - GTPU_V1_HDR_LEN);
 303               gtpu0->length = new_l0;
 304               gtpu1 = (gtpu_header_t *)(udp1+1);
 305               new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
 306                                              - sizeof (*ip4_1) - sizeof(*udp1)
 307                                              - GTPU_V1_HDR_LEN);
 308               gtpu1->length = new_l1;
 309               gtpu2 = (gtpu_header_t *)(udp2+1);
 310               new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
 311                                              - sizeof (*ip4_2) - sizeof(*udp2)
 312                                              - GTPU_V1_HDR_LEN);
 313               gtpu2->length = new_l2;
 314               gtpu3 = (gtpu_header_t *)(udp3+1);
 315               new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
 316                                              - sizeof (*ip4_3) - sizeof(*udp3)
 317                                              - GTPU_V1_HDR_LEN);
 318               gtpu3->length = new_l3;
 319             }
 320           else /* ipv6 */
 321             {
 322               int bogus = 0;
 323
 324               ip6_0 = vlib_buffer_get_current(b0);
 325               ip6_1 = vlib_buffer_get_current(b1);
 326               ip6_2 = vlib_buffer_get_current(b2);
 327               ip6_3 = vlib_buffer_get_current(b3);
 328
 329               /* Copy the fixed header */
 330               copy_dst0 = (u64 *) ip6_0;
 331               copy_src0 = (u64 *) t0->rewrite;
 332               copy_dst1 = (u64 *) ip6_1;
 333               copy_src1 = (u64 *) t1->rewrite;
 334               copy_dst2 = (u64 *) ip6_2;
 335               copy_src2 = (u64 *) t2->rewrite;
 336               copy_dst3 = (u64 *) ip6_3;
 337               copy_src3 = (u64 *) t3->rewrite;
 338               /* Copy first 56 (ip6) octets 8-bytes at a time */
 339 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 340               foreach_fixed_header6_offset;
 341 #undef _
 342 #define _(offs) copy_dst1[offs] = copy_src1[offs];
 343               foreach_fixed_header6_offset;
 344 #undef _
 345 #define _(offs) copy_dst2[offs] = copy_src2[offs];
 346               foreach_fixed_header6_offset;
 347 #undef _
 348 #define _(offs) copy_dst3[offs] = copy_src3[offs];
 349               foreach_fixed_header6_offset;
 350 #undef _
 351               /* Fix IP6 payload length */
 352               new_l0 =
 353                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
 354                                       - sizeof(*ip6_0));
 355               ip6_0->payload_length = new_l0;
 356               new_l1 =
 357                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
 358                                       - sizeof(*ip6_1));
 359               ip6_1->payload_length = new_l1;
 360               new_l2 =
 361                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b2)
 362                                       - sizeof(*ip6_2));
 363               ip6_2->payload_length = new_l2;
 364               new_l3 =
 365                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b3)
 366                                       - sizeof(*ip6_3));
 367               ip6_3->payload_length = new_l3;
 368
 369               /* Fix UDP length  and set source port */
 370               udp0 = (udp_header_t *)(ip6_0+1);
 371               udp0->length = new_l0;
 372               udp0->src_port = flow_hash0;
 373               udp1 = (udp_header_t *)(ip6_1+1);
 374               udp1->length = new_l1;
 375               udp1->src_port = flow_hash1;
 376               udp2 = (udp_header_t *)(ip6_2+1);
 377               udp2->length = new_l2;
 378               udp2->src_port = flow_hash2;
 379               udp3 = (udp_header_t *)(ip6_3+1);
 380               udp3->length = new_l3;
 381               udp3->src_port = flow_hash3;
 382
 383               /* Fix GTPU length */
 384               gtpu0 = (gtpu_header_t *)(udp0+1);
 385               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 386                                              - sizeof (*ip6_0) - sizeof(*udp0)
 387                                              - GTPU_V1_HDR_LEN);
 388               gtpu0->length = new_l0;
 389               gtpu1 = (gtpu_header_t *)(udp1+1);
 390               new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b1)
 391                                              - sizeof (*ip6_1) - sizeof(*udp1)
 392                                              - GTPU_V1_HDR_LEN);
 393               gtpu1->length = new_l1;
 394               gtpu2 = (gtpu_header_t *)(udp2+1);
 395               new_l2 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b2)
 396                                              - sizeof (*ip6_2) - sizeof(*udp2)
 397                                              - GTPU_V1_HDR_LEN);
 398               gtpu2->length = new_l2;
 399               gtpu3 = (gtpu_header_t *)(udp3+1);
 400               new_l3 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b3)
 401                                              - sizeof (*ip6_3) - sizeof(*udp3)
 402                                              - GTPU_V1_HDR_LEN);
 403               gtpu3->length = new_l3;
 404
 405               /* IPv6 UDP checksum is mandatory */
 406               udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0,
 407                                                                  ip6_0, &bogus);
 408               if (udp0->checksum == 0)
 409                 udp0->checksum = 0xffff;
 410               udp1->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b1,
 411                                                                  ip6_1, &bogus);
 412               if (udp1->checksum == 0)
 413                 udp1->checksum = 0xffff;
 414               udp2->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b2,
 415                                                                  ip6_2, &bogus);
 416               if (udp2->checksum == 0)
 417                 udp2->checksum = 0xffff;
 418               udp3->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b3,
 419                                                                  ip6_3, &bogus);
 420               if (udp3->checksum == 0)
 421                 udp3->checksum = 0xffff;
 422
 423             }
 424
 425           pkts_encapsulated += 4;
 426           len0 = vlib_buffer_length_in_chain (vm, b0);
 427           len1 = vlib_buffer_length_in_chain (vm, b1);
 428           len2 = vlib_buffer_length_in_chain (vm, b2);
 429           len3 = vlib_buffer_length_in_chain (vm, b3);
 430           stats_n_packets += 4;
 431           stats_n_bytes += len0 + len1 + len2 + len3;
 432
 433           /* Batch stats increment on the same gtpu tunnel so counter is not
 434              incremented per packet. Note stats are still incremented for deleted
 435              and admin-down tunnel where packets are dropped. It is not worthwhile
 436              to check for this rare case and affect normal path performance. */
 437           if (PREDICT_FALSE ((sw_if_index0 != stats_sw_if_index) ||
 438                              (sw_if_index1 != stats_sw_if_index) ||
 439                              (sw_if_index2 != stats_sw_if_index) ||
 440                              (sw_if_index3 != stats_sw_if_index) ))
 441             {
 442               stats_n_packets -= 4;
 443               stats_n_bytes -= len0 + len1 + len2 + len3;
 444               if ( (sw_if_index0 == sw_if_index1 ) &&
 445                    (sw_if_index1 == sw_if_index2 ) &&
 446                    (sw_if_index2 == sw_if_index3 ) )
 447                 {
 448                   if (stats_n_packets)
 449                     vlib_increment_combined_counter
 450                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 451                        thread_index, stats_sw_if_index,
 452                        stats_n_packets, stats_n_bytes);
 453                   stats_sw_if_index = sw_if_index0;
 454                   stats_n_packets = 4;
 455                   stats_n_bytes = len0 + len1 + len2 + len3;
 456                 }
 457               else
 458                 {
 459                   vlib_increment_combined_counter
 460                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 461                        thread_index, sw_if_index0, 1, len0);
 462                   vlib_increment_combined_counter
 463                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 464                        thread_index, sw_if_index1, 1, len1);
 465                   vlib_increment_combined_counter
 466                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 467                        thread_index, sw_if_index2, 1, len2);
 468                   vlib_increment_combined_counter
 469                       (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 470                        thread_index, sw_if_index3, 1, len3);
 471                 }
 472             }
 473
 474           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 475             {
 476               gtpu_encap_trace_t *tr =
 477                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 478               tr->tunnel_index = t0 - gtm->tunnels;
 479               tr->teid = t0->teid;
 480            }
 481
 482           if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
 483             {
 484               gtpu_encap_trace_t *tr =
 485                 vlib_add_trace (vm, node, b1, sizeof (*tr));
 486               tr->tunnel_index = t1 - gtm->tunnels;
 487               tr->teid = t1->teid;
 488             }
 489
 490           vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
 491                                            to_next, n_left_to_next,
 492                                            bi0, bi1, bi2, bi3,
 493                                            next0, next1, next2, next3);
 494         }
 495
 496       while (n_left_from > 0 && n_left_to_next > 0)
 497         {
 498           u32 bi0;
 499           vlib_buffer_t * b0;
 500           u32 flow_hash0;
 501           u32 len0;
 502           ip4_header_t * ip4_0;
 503           ip6_header_t * ip6_0;
 504           udp_header_t * udp0;
 505           gtpu_header_t * gtpu0;
 506           u64 * copy_src0, * copy_dst0;
 507           u32 * copy_src_last0, * copy_dst_last0;
 508           u16 new_l0;
 509           ip_csum_t sum0;
 510
 511           bi0 = from[0];
 512           to_next[0] = bi0;
 513           from += 1;
 514           to_next += 1;
 515           n_left_from -= 1;
 516           n_left_to_next -= 1;
 517
 518           b0 = vlib_get_buffer (vm, bi0);
 519
 520           flow_hash0 = vnet_l2_compute_flow_hash(b0);
 521
 522           /* Get next node index and adj index from tunnel next_dpo */
 523           sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX];
 524           hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
 525           t0 = &gtm->tunnels[hi0->dev_instance];
 526           /* Note: change to always set next0 if it may be set to drop */
 527           next0 = t0->next_dpo.dpoi_next_node;
 528           vnet_buffer(b0)->ip.adj_index[VLIB_TX] = t0->next_dpo.dpoi_index;
 529
 530           /* Apply the rewrite string. $$$$ vnet_rewrite? */
 531           vlib_buffer_advance (b0, -(word)_vec_len(t0->rewrite));
 532
 533           if (is_ip4)
 534             {
 535               ip4_0 = vlib_buffer_get_current(b0);
 536
 537               /* Copy the fixed header */
 538               copy_dst0 = (u64 *) ip4_0;
 539               copy_src0 = (u64 *) t0->rewrite;
 540               /* Copy first 32 octets 8-bytes at a time */
 541 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 542               foreach_fixed_header4_offset;
 543 #undef _
 544               /* Last 4 octets. Hopefully gcc will be our friend */
 545               copy_dst_last0 = (u32 *)(&copy_dst0[4]);
 546               copy_src_last0 = (u32 *)(&copy_src0[4]);
 547               copy_dst_last0[0] = copy_src_last0[0];
 548
 549               /* Fix the IP4 checksum and length */
 550               sum0 = ip4_0->checksum;
 551               new_l0 = /* old_l0 always 0, see the rewrite setup */
 552                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
 553               sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
 554                                      length /* changed member */);
 555               ip4_0->checksum = ip_csum_fold (sum0);
 556               ip4_0->length = new_l0;
 557
 558               /* Fix UDP length and set source port */
 559               udp0 = (udp_header_t *)(ip4_0+1);
 560               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 561                                              - sizeof (*ip4_0));
 562               udp0->length = new_l0;
 563               udp0->src_port = flow_hash0;
 564
 565               /* Fix GTPU length */
 566               gtpu0 = (gtpu_header_t *)(udp0+1);
 567               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 568                                              - sizeof (*ip4_0) - sizeof(*udp0)
 569                                              - GTPU_V1_HDR_LEN);
 570               gtpu0->length = new_l0;
 571             }
 572
 573           else /* ip6 path */
 574             {
 575               int bogus = 0;
 576
 577               ip6_0 = vlib_buffer_get_current(b0);
 578               /* Copy the fixed header */
 579               copy_dst0 = (u64 *) ip6_0;
 580               copy_src0 = (u64 *) t0->rewrite;
 581               /* Copy first 56 (ip6) octets 8-bytes at a time */
 582 #define _(offs) copy_dst0[offs] = copy_src0[offs];
 583               foreach_fixed_header6_offset;
 584 #undef _
 585               /* Fix IP6 payload length */
 586               new_l0 =
 587                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
 588                                       - sizeof(*ip6_0));
 589               ip6_0->payload_length = new_l0;
 590
 591               /* Fix UDP length  and set source port */
 592               udp0 = (udp_header_t *)(ip6_0+1);
 593               udp0->length = new_l0;
 594               udp0->src_port = flow_hash0;
 595
 596               /* Fix GTPU length */
 597               gtpu0 = (gtpu_header_t *)(udp0+1);
 598               new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain(vm, b0)
 599                                              - sizeof (*ip4_0) - sizeof(*udp0)
 600                                              - GTPU_V1_HDR_LEN);
 601               gtpu0->length = new_l0;
 602
 603               /* IPv6 UDP checksum is mandatory */
 604               udp0->checksum = ip6_tcp_udp_icmp_compute_checksum(vm, b0,
 605                                                                  ip6_0, &bogus);
 606               if (udp0->checksum == 0)
 607                 udp0->checksum = 0xffff;
 608             }
 609
 610           pkts_encapsulated ++;
 611           len0 = vlib_buffer_length_in_chain (vm, b0);
 612           stats_n_packets += 1;
 613           stats_n_bytes += len0;
 614
 615           /* Batch stats increment on the same gtpu tunnel so counter is not
 616              incremented per packet. Note stats are still incremented for deleted
 617              and admin-down tunnel where packets are dropped. It is not worthwhile
 618              to check for this rare case and affect normal path performance. */
 619           if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index))
 620             {
 621               stats_n_packets -= 1;
 622               stats_n_bytes -= len0;
 623               if (stats_n_packets)
 624                 vlib_increment_combined_counter
 625                   (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 626                    thread_index, stats_sw_if_index,
 627                    stats_n_packets, stats_n_bytes);
 628               stats_n_packets = 1;
 629               stats_n_bytes = len0;
 630               stats_sw_if_index = sw_if_index0;
 631             }
 632
 633           if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
 634             {
 635               gtpu_encap_trace_t *tr =
 636                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 637               tr->tunnel_index = t0 - gtm->tunnels;
 638               tr->teid = t0->teid;
 639             }
 640           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 641                                            to_next, n_left_to_next,
 642                                            bi0, next0);
 643         }
 644
 645       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 646     }
 647
 648   /* Do we still need this now that tunnel tx stats is kept? */
 649   vlib_node_increment_counter (vm, node->node_index,
 650                                GTPU_ENCAP_ERROR_ENCAPSULATED,
 651                                pkts_encapsulated);
 652
 653   /* Increment any remaining batch stats */
 654   if (stats_n_packets)
 655     {
 656       vlib_increment_combined_counter
 657         (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX,
 658          thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
 659       node->runtime_data[0] = stats_sw_if_index;
 660     }
 661
 662   return from_frame->n_vectors;
 663 }
 664
 665 static uword
 666 gtpu4_encap (vlib_main_t * vm,
 667               vlib_node_runtime_t * node,
 668               vlib_frame_t * from_frame)
 669 {
 670   return gtpu_encap_inline (vm, node, from_frame, /* is_ip4 */ 1);
 671 }
 672
 673 static uword
 674 gtpu6_encap (vlib_main_t * vm,
 675               vlib_node_runtime_t * node,
 676               vlib_frame_t * from_frame)
 677 {
 678   return gtpu_encap_inline (vm, node, from_frame, /* is_ip4 */ 0);
 679 }
 680
 681 VLIB_REGISTER_NODE (gtpu4_encap_node) = {
 682   .function = gtpu4_encap,
 683   .name = "gtpu4-encap",
 684   .vector_size = sizeof (u32),
 685   .format_trace = format_gtpu_encap_trace,
 686   .type = VLIB_NODE_TYPE_INTERNAL,
 687   .n_errors = ARRAY_LEN(gtpu_encap_error_strings),
 688   .error_strings = gtpu_encap_error_strings,
 689   .n_next_nodes = GTPU_ENCAP_N_NEXT,
 690   .next_nodes = {
 691 #define _(s,n) [GTPU_ENCAP_NEXT_##s] = n,
 692     foreach_gtpu_encap_next
 693 #undef _
 694   },
 695 };
 696
 697 VLIB_NODE_FUNCTION_MULTIARCH (gtpu4_encap_node, gtpu4_encap)
 698
 699 VLIB_REGISTER_NODE (gtpu6_encap_node) = {
 700   .function = gtpu6_encap,
 701   .name = "gtpu6-encap",
 702   .vector_size = sizeof (u32),
 703   .format_trace = format_gtpu_encap_trace,
 704   .type = VLIB_NODE_TYPE_INTERNAL,
 705   .n_errors = ARRAY_LEN(gtpu_encap_error_strings),
 706   .error_strings = gtpu_encap_error_strings,
 707   .n_next_nodes = GTPU_ENCAP_N_NEXT,
 708   .next_nodes = {
 709 #define _(s,n) [GTPU_ENCAP_NEXT_##s] = n,
 710     foreach_gtpu_encap_next
 711 #undef _
 712   },
 713 };
 714
 715 VLIB_NODE_FUNCTION_MULTIARCH (gtpu6_encap_node, gtpu6_encap)
 716