src/vnet/ipsec/ipsec_input.c

   1 /*
   2  * decap.c : IPSec tunnel decapsulation
   3  *
   4  * Copyright (c) 2015 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 <vnet/vnet.h>
  19 #include <vnet/api_errno.h>
  20 #include <vnet/ip/ip.h>
  21 #include <vnet/feature/feature.h>
  22
  23 #include <vnet/ipsec/ipsec.h>
  24 #include <vnet/ipsec/esp.h>
  25 #include <vnet/ipsec/ah.h>
  26 #include <vnet/ipsec/ipsec_io.h>
  27
  28 #define foreach_ipsec_input_error                       \
  29 _(RX_PKTS, "IPSec pkts received")                       \
  30 _(RX_POLICY_MATCH, "IPSec policy match")                \
  31 _(RX_POLICY_NO_MATCH, "IPSec policy not matched")       \
  32 _(RX_POLICY_BYPASS, "IPSec policy bypass")              \
  33 _(RX_POLICY_DISCARD, "IPSec policy discard")
  34
  35 typedef enum
  36 {
  37 #define _(sym,str) IPSEC_INPUT_ERROR_##sym,
  38   foreach_ipsec_input_error
  39 #undef _
  40     IPSEC_INPUT_N_ERROR,
  41 } ipsec_input_error_t;
  42
  43 static char *ipsec_input_error_strings[] = {
  44 #define _(sym,string) string,
  45   foreach_ipsec_input_error
  46 #undef _
  47 };
  48
  49 typedef struct
  50 {
  51   ip_protocol_t proto;
  52   u32 spd;
  53   u32 policy_index;
  54   u32 sa_id;
  55   u32 spi;
  56   u32 seq;
  57 } ipsec_input_trace_t;
  58
  59 /* packet trace format function */
  60 static u8 *
  61 format_ipsec_input_trace (u8 * s, va_list * args)
  62 {
  63   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  64   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  65   ipsec_input_trace_t *t = va_arg (*args, ipsec_input_trace_t *);
  66
  67   s = format (s, "%U: sa_id %u spd %u policy %d spi %u (0x%08x) seq %u",
  68               format_ip_protocol, t->proto, t->sa_id,
  69               t->spd, t->policy_index, t->spi, t->spi, t->seq);
  70
  71   return s;
  72 }
  73
  74 always_inline ipsec_policy_t *
  75 ipsec_input_policy_match (ipsec_spd_t * spd, u32 sa, u32 da,
  76                           ipsec_spd_policy_type_t policy_type)
  77 {
  78   ipsec_main_t *im = &ipsec_main;
  79   ipsec_policy_t *p;
  80   u32 *i;
  81
  82   vec_foreach (i, spd->policies[policy_type])
  83   {
  84     p = pool_elt_at_index (im->policies, *i);
  85
  86     if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
  87       continue;
  88
  89     if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
  90       continue;
  91
  92     if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
  93       continue;
  94
  95     if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
  96       continue;
  97
  98     return p;
  99   }
 100   return 0;
 101 }
 102
 103 always_inline ipsec_policy_t *
 104 ipsec_input_protect_policy_match (ipsec_spd_t * spd, u32 sa, u32 da, u32 spi)
 105 {
 106   ipsec_main_t *im = &ipsec_main;
 107   ipsec_policy_t *p;
 108   ipsec_sa_t *s;
 109   u32 *i;
 110
 111   vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT])
 112   {
 113     p = pool_elt_at_index (im->policies, *i);
 114     s = ipsec_sa_get (p->sa_index);
 115
 116     if (spi != s->spi)
 117       continue;
 118
 119     if (ipsec_sa_is_set_IS_TUNNEL (s))
 120       {
 121         if (da != clib_net_to_host_u32 (s->tunnel.t_dst.ip.ip4.as_u32))
 122           continue;
 123
 124         if (sa != clib_net_to_host_u32 (s->tunnel.t_src.ip.ip4.as_u32))
 125           continue;
 126
 127         return p;
 128       }
 129
 130     if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
 131       continue;
 132
 133     if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
 134       continue;
 135
 136     if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
 137       continue;
 138
 139     if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
 140       continue;
 141
 142     return p;
 143   }
 144   return 0;
 145 }
 146
 147 always_inline uword
 148 ip6_addr_match_range (ip6_address_t * a, ip6_address_t * la,
 149                       ip6_address_t * ua)
 150 {
 151   if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) &&
 152       (memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0))
 153     return 1;
 154   return 0;
 155 }
 156
 157 always_inline ipsec_policy_t *
 158 ipsec6_input_protect_policy_match (ipsec_spd_t * spd,
 159                                    ip6_address_t * sa,
 160                                    ip6_address_t * da, u32 spi)
 161 {
 162   ipsec_main_t *im = &ipsec_main;
 163   ipsec_policy_t *p;
 164   ipsec_sa_t *s;
 165   u32 *i;
 166
 167   vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP6_INBOUND_PROTECT])
 168   {
 169     p = pool_elt_at_index (im->policies, *i);
 170     s = ipsec_sa_get (p->sa_index);
 171
 172     if (spi != s->spi)
 173       continue;
 174
 175     if (ipsec_sa_is_set_IS_TUNNEL (s))
 176       {
 177         if (!ip6_address_is_equal (sa, &s->tunnel.t_src.ip.ip6))
 178           continue;
 179
 180         if (!ip6_address_is_equal (da, &s->tunnel.t_dst.ip.ip6))
 181           continue;
 182
 183         return p;
 184       }
 185
 186     if (!ip6_addr_match_range (sa, &p->raddr.start.ip6, &p->raddr.stop.ip6))
 187       continue;
 188
 189     if (!ip6_addr_match_range (da, &p->laddr.start.ip6, &p->laddr.stop.ip6))
 190       continue;
 191
 192     return p;
 193   }
 194   return 0;
 195 }
 196
 197 extern vlib_node_registration_t ipsec4_input_node;
 198
 199 VLIB_NODE_FN (ipsec4_input_node) (vlib_main_t * vm,
 200                                   vlib_node_runtime_t * node,
 201                                   vlib_frame_t * frame)
 202 {
 203   u32 n_left_from, *from, thread_index;
 204   ipsec_main_t *im = &ipsec_main;
 205   u64 ipsec_unprocessed = 0, ipsec_matched = 0;
 206   u64 ipsec_dropped = 0, ipsec_bypassed = 0;
 207   vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
 208   vlib_buffer_t **b = bufs;
 209   u16 nexts[VLIB_FRAME_SIZE], *next;
 210
 211   from = vlib_frame_vector_args (frame);
 212   n_left_from = frame->n_vectors;
 213   next = nexts;
 214   vlib_get_buffers (vm, from, bufs, n_left_from);
 215   thread_index = vm->thread_index;
 216
 217
 218   while (n_left_from > 0)
 219     {
 220       u32 next32, pi0;
 221       ip4_header_t *ip0;
 222       esp_header_t *esp0 = NULL;
 223       ah_header_t *ah0;
 224       ip4_ipsec_config_t *c0;
 225       ipsec_spd_t *spd0;
 226       ipsec_policy_t *p0 = NULL;
 227       u8 has_space0;
 228
 229       if (n_left_from > 2)
 230         {
 231           vlib_prefetch_buffer_data (b[1], LOAD);
 232         }
 233
 234       b[0]->flags |= VNET_BUFFER_F_IS_IP4;
 235       b[0]->flags &= ~VNET_BUFFER_F_IS_IP6;
 236       c0 = vnet_feature_next_with_data (&next32, b[0], sizeof (c0[0]));
 237       next[0] = (u16) next32;
 238
 239       spd0 = pool_elt_at_index (im->spds, c0->spd_index);
 240
 241       ip0 = vlib_buffer_get_current (b[0]);
 242
 243       if (PREDICT_TRUE
 244           (ip0->protocol == IP_PROTOCOL_IPSEC_ESP
 245            || ip0->protocol == IP_PROTOCOL_UDP))
 246         {
 247
 248           esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 249           if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_UDP))
 250             {
 251               /* FIXME Skip, if not a UDP encapsulated packet */
 252               esp0 = (esp_header_t *) ((u8 *) esp0 + sizeof (udp_header_t));
 253             }
 254
 255           p0 = ipsec_input_protect_policy_match (spd0,
 256                                                  clib_net_to_host_u32
 257                                                  (ip0->src_address.as_u32),
 258                                                  clib_net_to_host_u32
 259                                                  (ip0->dst_address.as_u32),
 260                                                  clib_net_to_host_u32
 261                                                  (esp0->spi));
 262
 263           has_space0 =
 264             vlib_buffer_has_space (b[0],
 265                                    (clib_address_t) (esp0 + 1) -
 266                                    (clib_address_t) ip0);
 267
 268           if (PREDICT_TRUE ((p0 != NULL) & (has_space0)))
 269             {
 270               ipsec_matched += 1;
 271
 272               pi0 = p0 - im->policies;
 273               vlib_increment_combined_counter
 274                 (&ipsec_spd_policy_counters,
 275                  thread_index, pi0, 1, clib_net_to_host_u16 (ip0->length));
 276
 277               vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index;
 278               next[0] = im->esp4_decrypt_next_index;
 279               vlib_buffer_advance (b[0], ((u8 *) esp0 - (u8 *) ip0));
 280               goto trace0;
 281             }
 282           else
 283             {
 284               p0 = 0;
 285               pi0 = ~0;
 286             };
 287
 288           p0 = ipsec_input_policy_match (spd0,
 289                                          clib_net_to_host_u32
 290                                          (ip0->src_address.as_u32),
 291                                          clib_net_to_host_u32
 292                                          (ip0->dst_address.as_u32),
 293                                          IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
 294           if (PREDICT_TRUE ((p0 != NULL)))
 295             {
 296               ipsec_bypassed += 1;
 297
 298               pi0 = p0 - im->policies;
 299               vlib_increment_combined_counter (
 300                 &ipsec_spd_policy_counters, thread_index, pi0, 1,
 301                 clib_net_to_host_u16 (ip0->length));
 302
 303               goto trace0;
 304             }
 305           else
 306             {
 307               p0 = 0;
 308               pi0 = ~0;
 309             };
 310
 311           p0 = ipsec_input_policy_match (spd0,
 312                                          clib_net_to_host_u32
 313                                          (ip0->src_address.as_u32),
 314                                          clib_net_to_host_u32
 315                                          (ip0->dst_address.as_u32),
 316                                          IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
 317           if (PREDICT_TRUE ((p0 != NULL)))
 318             {
 319               ipsec_dropped += 1;
 320
 321               pi0 = p0 - im->policies;
 322               vlib_increment_combined_counter (
 323                 &ipsec_spd_policy_counters, thread_index, pi0, 1,
 324                 clib_net_to_host_u16 (ip0->length));
 325
 326               next[0] = IPSEC_INPUT_NEXT_DROP;
 327               goto trace0;
 328             }
 329           else
 330             {
 331               p0 = 0;
 332               pi0 = ~0;
 333             };
 334
 335           /* Drop by default if no match on PROTECT, BYPASS or DISCARD */
 336           ipsec_unprocessed += 1;
 337           next[0] = IPSEC_INPUT_NEXT_DROP;
 338
 339         trace0:
 340           if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
 341               PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 342             {
 343               ipsec_input_trace_t *tr =
 344                 vlib_add_trace (vm, node, b[0], sizeof (*tr));
 345
 346               tr->proto = ip0->protocol;
 347               tr->sa_id = p0 ? p0->sa_id : ~0;
 348               tr->spi = has_space0 ? clib_net_to_host_u32 (esp0->spi) : ~0;
 349               tr->seq = has_space0 ? clib_net_to_host_u32 (esp0->seq) : ~0;
 350               tr->spd = spd0->id;
 351               tr->policy_index = pi0;
 352             }
 353         }
 354       else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH)
 355         {
 356           ah0 = (ah_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 357           p0 = ipsec_input_protect_policy_match (spd0,
 358                                                  clib_net_to_host_u32
 359                                                  (ip0->src_address.as_u32),
 360                                                  clib_net_to_host_u32
 361                                                  (ip0->dst_address.as_u32),
 362                                                  clib_net_to_host_u32
 363                                                  (ah0->spi));
 364
 365           has_space0 =
 366             vlib_buffer_has_space (b[0],
 367                                    (clib_address_t) (ah0 + 1) -
 368                                    (clib_address_t) ip0);
 369
 370           if (PREDICT_TRUE ((p0 != NULL) & (has_space0)))
 371             {
 372               ipsec_matched += 1;
 373
 374               pi0 = p0 - im->policies;
 375               vlib_increment_combined_counter
 376                 (&ipsec_spd_policy_counters,
 377                  thread_index, pi0, 1, clib_net_to_host_u16 (ip0->length));
 378
 379               vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index;
 380               next[0] = im->ah4_decrypt_next_index;
 381               goto trace1;
 382             }
 383           else
 384             {
 385               p0 = 0;
 386               pi0 = ~0;
 387             }
 388
 389           p0 = ipsec_input_policy_match (spd0,
 390                                          clib_net_to_host_u32
 391                                          (ip0->src_address.as_u32),
 392                                          clib_net_to_host_u32
 393                                          (ip0->dst_address.as_u32),
 394                                          IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
 395           if (PREDICT_TRUE ((p0 != NULL)))
 396             {
 397               ipsec_bypassed += 1;
 398
 399               pi0 = p0 - im->policies;
 400               vlib_increment_combined_counter (
 401                 &ipsec_spd_policy_counters, thread_index, pi0, 1,
 402                 clib_net_to_host_u16 (ip0->length));
 403
 404               goto trace1;
 405             }
 406           else
 407             {
 408               p0 = 0;
 409               pi0 = ~0;
 410             };
 411
 412           p0 = ipsec_input_policy_match (spd0,
 413                                          clib_net_to_host_u32
 414                                          (ip0->src_address.as_u32),
 415                                          clib_net_to_host_u32
 416                                          (ip0->dst_address.as_u32),
 417                                          IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
 418           if (PREDICT_TRUE ((p0 != NULL)))
 419             {
 420               ipsec_dropped += 1;
 421
 422               pi0 = p0 - im->policies;
 423               vlib_increment_combined_counter (
 424                 &ipsec_spd_policy_counters, thread_index, pi0, 1,
 425                 clib_net_to_host_u16 (ip0->length));
 426
 427               next[0] = IPSEC_INPUT_NEXT_DROP;
 428               goto trace1;
 429             }
 430           else
 431             {
 432               p0 = 0;
 433               pi0 = ~0;
 434             };
 435
 436           /* Drop by default if no match on PROTECT, BYPASS or DISCARD */
 437           ipsec_unprocessed += 1;
 438           next[0] = IPSEC_INPUT_NEXT_DROP;
 439
 440         trace1:
 441           if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
 442               PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 443             {
 444               ipsec_input_trace_t *tr =
 445                 vlib_add_trace (vm, node, b[0], sizeof (*tr));
 446
 447               tr->proto = ip0->protocol;
 448               tr->sa_id = p0 ? p0->sa_id : ~0;
 449               tr->spi = has_space0 ? clib_net_to_host_u32 (ah0->spi) : ~0;
 450               tr->seq = has_space0 ? clib_net_to_host_u32 (ah0->seq_no) : ~0;
 451               tr->spd = spd0->id;
 452               tr->policy_index = pi0;
 453             }
 454         }
 455       else
 456         {
 457           ipsec_unprocessed += 1;
 458         }
 459       n_left_from -= 1;
 460       b += 1;
 461       next += 1;
 462     }
 463
 464   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 465
 466   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 467                                IPSEC_INPUT_ERROR_RX_PKTS, frame->n_vectors);
 468
 469   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 470                                IPSEC_INPUT_ERROR_RX_POLICY_MATCH,
 471                                ipsec_matched);
 472
 473   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 474                                IPSEC_INPUT_ERROR_RX_POLICY_NO_MATCH,
 475                                ipsec_unprocessed);
 476
 477   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 478                                IPSEC_INPUT_ERROR_RX_POLICY_DISCARD,
 479                                ipsec_dropped);
 480
 481   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 482                                IPSEC_INPUT_ERROR_RX_POLICY_BYPASS,
 483                                ipsec_bypassed);
 484
 485   return frame->n_vectors;
 486 }
 487
 488
 489 /* *INDENT-OFF* */
 490 VLIB_REGISTER_NODE (ipsec4_input_node) = {
 491   .name = "ipsec4-input-feature",
 492   .vector_size = sizeof (u32),
 493   .format_trace = format_ipsec_input_trace,
 494   .type = VLIB_NODE_TYPE_INTERNAL,
 495   .n_errors = ARRAY_LEN(ipsec_input_error_strings),
 496   .error_strings = ipsec_input_error_strings,
 497   .n_next_nodes = IPSEC_INPUT_N_NEXT,
 498   .next_nodes = {
 499 #define _(s,n) [IPSEC_INPUT_NEXT_##s] = n,
 500     foreach_ipsec_input_next
 501 #undef _
 502   },
 503 };
 504 /* *INDENT-ON* */
 505
 506 extern vlib_node_registration_t ipsec6_input_node;
 507
 508
 509 VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm,
 510                                   vlib_node_runtime_t * node,
 511                                   vlib_frame_t * from_frame)
 512 {
 513   u32 n_left_from, *from, next_index, *to_next, thread_index;
 514   ipsec_main_t *im = &ipsec_main;
 515   u32 ipsec_unprocessed = 0;
 516   u32 ipsec_matched = 0;
 517
 518   from = vlib_frame_vector_args (from_frame);
 519   n_left_from = from_frame->n_vectors;
 520   thread_index = vm->thread_index;
 521
 522   next_index = node->cached_next_index;
 523
 524   while (n_left_from > 0)
 525     {
 526       u32 n_left_to_next;
 527
 528       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 529
 530       while (n_left_from > 0 && n_left_to_next > 0)
 531         {
 532           u32 bi0, next0, pi0;
 533           vlib_buffer_t *b0;
 534           ip6_header_t *ip0;
 535           esp_header_t *esp0;
 536           ip4_ipsec_config_t *c0;
 537           ipsec_spd_t *spd0;
 538           ipsec_policy_t *p0 = 0;
 539           ah_header_t *ah0;
 540           u32 header_size = sizeof (ip0[0]);
 541
 542           bi0 = to_next[0] = from[0];
 543           from += 1;
 544           n_left_from -= 1;
 545           to_next += 1;
 546           n_left_to_next -= 1;
 547
 548           b0 = vlib_get_buffer (vm, bi0);
 549           b0->flags |= VNET_BUFFER_F_IS_IP6;
 550           b0->flags &= ~VNET_BUFFER_F_IS_IP4;
 551           c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0]));
 552
 553           spd0 = pool_elt_at_index (im->spds, c0->spd_index);
 554
 555           ip0 = vlib_buffer_get_current (b0);
 556           esp0 = (esp_header_t *) ((u8 *) ip0 + header_size);
 557           ah0 = (ah_header_t *) ((u8 *) ip0 + header_size);
 558
 559           if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP))
 560             {
 561 #if 0
 562               clib_warning
 563                 ("packet received from %U to %U spi %u size %u spd_id %u",
 564                  format_ip6_address, &ip0->src_address, format_ip6_address,
 565                  &ip0->dst_address, clib_net_to_host_u32 (esp0->spi),
 566                  clib_net_to_host_u16 (ip0->payload_length) + header_size,
 567                  spd0->id);
 568 #endif
 569               p0 = ipsec6_input_protect_policy_match (spd0,
 570                                                       &ip0->src_address,
 571                                                       &ip0->dst_address,
 572                                                       clib_net_to_host_u32
 573                                                       (esp0->spi));
 574
 575               if (PREDICT_TRUE (p0 != 0))
 576                 {
 577                   ipsec_matched += 1;
 578
 579                   pi0 = p0 - im->policies;
 580                   vlib_increment_combined_counter
 581                     (&ipsec_spd_policy_counters,
 582                      thread_index, pi0, 1,
 583                      clib_net_to_host_u16 (ip0->payload_length) +
 584                      header_size);
 585
 586                   vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
 587                   next0 = im->esp6_decrypt_next_index;
 588                   vlib_buffer_advance (b0, header_size);
 589                   goto trace0;
 590                 }
 591               else
 592                 {
 593                   pi0 = ~0;
 594                   ipsec_unprocessed += 1;
 595                   next0 = IPSEC_INPUT_NEXT_DROP;
 596                 }
 597             }
 598           else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH)
 599             {
 600               p0 = ipsec6_input_protect_policy_match (spd0,
 601                                                       &ip0->src_address,
 602                                                       &ip0->dst_address,
 603                                                       clib_net_to_host_u32
 604                                                       (ah0->spi));
 605
 606               if (PREDICT_TRUE (p0 != 0))
 607                 {
 608                   ipsec_matched += 1;
 609                   pi0 = p0 - im->policies;
 610                   vlib_increment_combined_counter
 611                     (&ipsec_spd_policy_counters,
 612                      thread_index, pi0, 1,
 613                      clib_net_to_host_u16 (ip0->payload_length) +
 614                      header_size);
 615
 616                   vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
 617                   next0 = im->ah6_decrypt_next_index;
 618                   goto trace0;
 619                 }
 620               else
 621                 {
 622                   pi0 = ~0;
 623                   ipsec_unprocessed += 1;
 624                   next0 = IPSEC_INPUT_NEXT_DROP;
 625                 }
 626             }
 627           else
 628             {
 629               ipsec_unprocessed += 1;
 630             }
 631
 632         trace0:
 633           if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
 634               PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 635             {
 636               ipsec_input_trace_t *tr =
 637                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 638
 639               if (p0)
 640                 tr->sa_id = p0->sa_id;
 641               tr->proto = ip0->protocol;
 642               tr->spi = clib_net_to_host_u32 (esp0->spi);
 643               tr->seq = clib_net_to_host_u32 (esp0->seq);
 644               tr->spd = spd0->id;
 645             }
 646
 647           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 648                                            n_left_to_next, bi0, next0);
 649         }
 650       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 651     }
 652
 653   vlib_node_increment_counter (vm, ipsec6_input_node.index,
 654                                IPSEC_INPUT_ERROR_RX_PKTS,
 655                                from_frame->n_vectors - ipsec_unprocessed);
 656
 657   vlib_node_increment_counter (vm, ipsec6_input_node.index,
 658                                IPSEC_INPUT_ERROR_RX_POLICY_MATCH,
 659                                ipsec_matched);
 660
 661   return from_frame->n_vectors;
 662 }
 663
 664
 665 /* *INDENT-OFF* */
 666 VLIB_REGISTER_NODE (ipsec6_input_node) = {
 667   .name = "ipsec6-input-feature",
 668   .vector_size = sizeof (u32),
 669   .format_trace = format_ipsec_input_trace,
 670   .type = VLIB_NODE_TYPE_INTERNAL,
 671   .n_errors = ARRAY_LEN(ipsec_input_error_strings),
 672   .error_strings = ipsec_input_error_strings,
 673   .n_next_nodes = IPSEC_INPUT_N_NEXT,
 674   .next_nodes = {
 675 #define _(s,n) [IPSEC_INPUT_NEXT_##s] = n,
 676     foreach_ipsec_input_next
 677 #undef _
 678   },
 679 };
 680 /* *INDENT-ON* */
 681
 682 /*
 683  * fd.io coding-style-patch-verification: ON
 684  *
 685  * Local Variables:
 686  * eval: (c-set-style "gnu")
 687  * End:
 688  */