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 void
  75 ipsec4_input_spd_add_flow_cache_entry (ipsec_main_t *im, u32 sa, u32 da,
  76                                        ipsec_spd_policy_type_t policy_type,
  77                                        u32 pol_id)
  78 {
  79   u64 hash;
  80   u8 is_overwrite = 0, is_stale_overwrite = 0;
  81   /* Store in network byte order to avoid conversion on lookup */
  82   ipsec4_inbound_spd_tuple_t ip4_tuple = {
  83     .ip4_src_addr = (ip4_address_t) clib_host_to_net_u32 (sa),
  84     .ip4_dest_addr = (ip4_address_t) clib_host_to_net_u32 (da),
  85     .policy_type = policy_type
  86   };
  87
  88   ip4_tuple.kv_16_8.value =
  89     (((u64) pol_id) << 32) | ((u64) im->input_epoch_count);
  90
  91   hash = ipsec4_hash_16_8 (&ip4_tuple.kv_16_8);
  92   hash &= (im->ipsec4_in_spd_hash_num_buckets - 1);
  93
  94   ipsec_spinlock_lock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock);
  95   /* Check if we are overwriting an existing entry so we know
  96     whether to increment the flow cache counter. Since flow
  97     cache counter is reset on any policy add/remove, but
  98     hash table values are not, we need to check if the entry
  99     we are overwriting is stale or not. If it's a stale entry
 100     overwrite, we still want to increment flow cache counter */
 101   is_overwrite = (im->ipsec4_in_spd_hash_tbl[hash].value != 0);
 102   /* Check if we are overwriting a stale entry by comparing
 103      with current epoch count */
 104   if (PREDICT_FALSE (is_overwrite))
 105     is_stale_overwrite =
 106       (im->input_epoch_count !=
 107        ((u32) (im->ipsec4_in_spd_hash_tbl[hash].value & 0xFFFFFFFF)));
 108   clib_memcpy_fast (&im->ipsec4_in_spd_hash_tbl[hash], &ip4_tuple.kv_16_8,
 109                     sizeof (ip4_tuple.kv_16_8));
 110   ipsec_spinlock_unlock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock);
 111
 112   /* Increment the counter to track active flow cache entries
 113     when entering a fresh entry or overwriting a stale one */
 114   if (!is_overwrite || is_stale_overwrite)
 115     clib_atomic_fetch_add_relax (&im->ipsec4_in_spd_flow_cache_entries, 1);
 116
 117   return;
 118 }
 119
 120 always_inline ipsec_policy_t *
 121 ipsec4_input_spd_find_flow_cache_entry (ipsec_main_t *im, u32 sa, u32 da,
 122                                         ipsec_spd_policy_type_t policy_type)
 123 {
 124   ipsec_policy_t *p = NULL;
 125   ipsec4_hash_kv_16_8_t kv_result;
 126   u64 hash;
 127   ipsec4_inbound_spd_tuple_t ip4_tuple = { .ip4_src_addr = (ip4_address_t) sa,
 128                                            .ip4_dest_addr = (ip4_address_t) da,
 129                                            .policy_type = policy_type };
 130
 131   hash = ipsec4_hash_16_8 (&ip4_tuple.kv_16_8);
 132   hash &= (im->ipsec4_in_spd_hash_num_buckets - 1);
 133
 134   ipsec_spinlock_lock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock);
 135   kv_result = im->ipsec4_in_spd_hash_tbl[hash];
 136   ipsec_spinlock_unlock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock);
 137
 138   if (ipsec4_hash_key_compare_16_8 ((u64 *) &ip4_tuple.kv_16_8,
 139                                     (u64 *) &kv_result))
 140     {
 141       if (im->input_epoch_count == ((u32) (kv_result.value & 0xFFFFFFFF)))
 142         {
 143           /* Get the policy based on the index */
 144           p =
 145             pool_elt_at_index (im->policies, ((u32) (kv_result.value >> 32)));
 146         }
 147     }
 148
 149   return p;
 150 }
 151
 152 always_inline ipsec_policy_t *
 153 ipsec_input_policy_match (ipsec_spd_t *spd, u32 sa, u32 da,
 154                           ipsec_spd_policy_type_t policy_type)
 155 {
 156   ipsec_main_t *im = &ipsec_main;
 157   ipsec_policy_t *p;
 158   u32 *i;
 159
 160   vec_foreach (i, spd->policies[policy_type])
 161   {
 162     p = pool_elt_at_index (im->policies, *i);
 163
 164     if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
 165       continue;
 166
 167     if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
 168       continue;
 169
 170     if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
 171       continue;
 172
 173     if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
 174       continue;
 175
 176     if (im->input_flow_cache_flag)
 177       {
 178         /* Add an Entry in Flow cache */
 179         ipsec4_input_spd_add_flow_cache_entry (im, sa, da, policy_type, *i);
 180       }
 181     return p;
 182   }
 183   return 0;
 184 }
 185
 186 always_inline ipsec_policy_t *
 187 ipsec_input_protect_policy_match (ipsec_spd_t *spd, u32 sa, u32 da, u32 spi)
 188 {
 189   ipsec_main_t *im = &ipsec_main;
 190   ipsec_policy_t *p;
 191   ipsec_sa_t *s;
 192   u32 *i;
 193
 194   vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT])
 195   {
 196     p = pool_elt_at_index (im->policies, *i);
 197     s = ipsec_sa_get (p->sa_index);
 198
 199     if (spi != s->spi)
 200       continue;
 201
 202     if (ipsec_sa_is_set_IS_TUNNEL (s))
 203       {
 204         if (da != clib_net_to_host_u32 (s->tunnel.t_dst.ip.ip4.as_u32))
 205           continue;
 206
 207         if (sa != clib_net_to_host_u32 (s->tunnel.t_src.ip.ip4.as_u32))
 208           continue;
 209
 210         goto return_policy;
 211       }
 212
 213     if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
 214       continue;
 215
 216     if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
 217       continue;
 218
 219     if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
 220       continue;
 221
 222     if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
 223       continue;
 224
 225   return_policy:
 226     if (im->input_flow_cache_flag)
 227       {
 228         /* Add an Entry in Flow cache */
 229         ipsec4_input_spd_add_flow_cache_entry (
 230           im, sa, da, IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT, *i);
 231       }
 232
 233     return p;
 234   }
 235   return 0;
 236 }
 237
 238 always_inline uword
 239 ip6_addr_match_range (ip6_address_t * a, ip6_address_t * la,
 240                       ip6_address_t * ua)
 241 {
 242   if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) &&
 243       (memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0))
 244     return 1;
 245   return 0;
 246 }
 247
 248 always_inline ipsec_policy_t *
 249 ipsec6_input_protect_policy_match (ipsec_spd_t * spd,
 250                                    ip6_address_t * sa,
 251                                    ip6_address_t * da, u32 spi)
 252 {
 253   ipsec_main_t *im = &ipsec_main;
 254   ipsec_policy_t *p;
 255   ipsec_sa_t *s;
 256   u32 *i;
 257
 258   vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP6_INBOUND_PROTECT])
 259   {
 260     p = pool_elt_at_index (im->policies, *i);
 261     s = ipsec_sa_get (p->sa_index);
 262
 263     if (spi != s->spi)
 264       continue;
 265
 266     if (ipsec_sa_is_set_IS_TUNNEL (s))
 267       {
 268         if (!ip6_address_is_equal (sa, &s->tunnel.t_src.ip.ip6))
 269           continue;
 270
 271         if (!ip6_address_is_equal (da, &s->tunnel.t_dst.ip.ip6))
 272           continue;
 273
 274         return p;
 275       }
 276
 277     if (!ip6_addr_match_range (sa, &p->raddr.start.ip6, &p->raddr.stop.ip6))
 278       continue;
 279
 280     if (!ip6_addr_match_range (da, &p->laddr.start.ip6, &p->laddr.stop.ip6))
 281       continue;
 282
 283     return p;
 284   }
 285   return 0;
 286 }
 287
 288 extern vlib_node_registration_t ipsec4_input_node;
 289
 290 VLIB_NODE_FN (ipsec4_input_node) (vlib_main_t * vm,
 291                                   vlib_node_runtime_t * node,
 292                                   vlib_frame_t * frame)
 293 {
 294   u32 n_left_from, *from, thread_index;
 295   ipsec_main_t *im = &ipsec_main;
 296   u64 ipsec_unprocessed = 0, ipsec_matched = 0;
 297   u64 ipsec_dropped = 0, ipsec_bypassed = 0;
 298   vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
 299   vlib_buffer_t **b = bufs;
 300   u16 nexts[VLIB_FRAME_SIZE], *next;
 301
 302   from = vlib_frame_vector_args (frame);
 303   n_left_from = frame->n_vectors;
 304   next = nexts;
 305   vlib_get_buffers (vm, from, bufs, n_left_from);
 306   thread_index = vm->thread_index;
 307
 308
 309   while (n_left_from > 0)
 310     {
 311       u32 next32, pi0;
 312       ip4_header_t *ip0;
 313       esp_header_t *esp0 = NULL;
 314       ah_header_t *ah0;
 315       ip4_ipsec_config_t *c0;
 316       ipsec_spd_t *spd0;
 317       ipsec_policy_t *p0 = NULL;
 318       u8 has_space0;
 319       bool search_flow_cache = false;
 320
 321       if (n_left_from > 2)
 322         {
 323           vlib_prefetch_buffer_data (b[1], LOAD);
 324         }
 325
 326       b[0]->flags |= VNET_BUFFER_F_IS_IP4;
 327       b[0]->flags &= ~VNET_BUFFER_F_IS_IP6;
 328       c0 = vnet_feature_next_with_data (&next32, b[0], sizeof (c0[0]));
 329       next[0] = (u16) next32;
 330
 331       spd0 = pool_elt_at_index (im->spds, c0->spd_index);
 332
 333       ip0 = vlib_buffer_get_current (b[0]);
 334
 335       if (PREDICT_TRUE
 336           (ip0->protocol == IP_PROTOCOL_IPSEC_ESP
 337            || ip0->protocol == IP_PROTOCOL_UDP))
 338         {
 339
 340           esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 341           if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_UDP))
 342             {
 343               /* FIXME Skip, if not a UDP encapsulated packet */
 344               esp0 = (esp_header_t *) ((u8 *) esp0 + sizeof (udp_header_t));
 345             }
 346
 347           // if flow cache is enabled, first search through flow cache for a
 348           // policy match for either protect, bypass or discard rules, in that
 349           // order. if no match is found search_flow_cache is set to false (1)
 350           // and we revert back to linear search
 351           search_flow_cache = im->input_flow_cache_flag;
 352
 353         esp_or_udp:
 354           if (search_flow_cache) // attempt to match policy in flow cache
 355             {
 356               p0 = ipsec4_input_spd_find_flow_cache_entry (
 357                 im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
 358                 IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT);
 359             }
 360
 361           else // linear search if flow cache is not enabled,
 362                // or flow cache search just failed
 363             {
 364               p0 = ipsec_input_protect_policy_match (
 365                 spd0, clib_net_to_host_u32 (ip0->src_address.as_u32),
 366                 clib_net_to_host_u32 (ip0->dst_address.as_u32),
 367                 clib_net_to_host_u32 (esp0->spi));
 368             }
 369
 370           has_space0 =
 371             vlib_buffer_has_space (b[0],
 372                                    (clib_address_t) (esp0 + 1) -
 373                                    (clib_address_t) ip0);
 374
 375           if (PREDICT_TRUE ((p0 != NULL) & (has_space0)))
 376             {
 377               ipsec_matched += 1;
 378
 379               pi0 = p0 - im->policies;
 380               vlib_increment_combined_counter
 381                 (&ipsec_spd_policy_counters,
 382                  thread_index, pi0, 1, clib_net_to_host_u16 (ip0->length));
 383
 384               vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index;
 385               next[0] = im->esp4_decrypt_next_index;
 386               vlib_buffer_advance (b[0], ((u8 *) esp0 - (u8 *) ip0));
 387               goto trace0;
 388             }
 389           else
 390             {
 391               p0 = 0;
 392               pi0 = ~0;
 393             };
 394
 395           if (search_flow_cache)
 396             {
 397               p0 = ipsec4_input_spd_find_flow_cache_entry (
 398                 im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
 399                 IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
 400             }
 401
 402           else
 403             {
 404               p0 = ipsec_input_policy_match (
 405                 spd0, clib_net_to_host_u32 (ip0->src_address.as_u32),
 406                 clib_net_to_host_u32 (ip0->dst_address.as_u32),
 407                 IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
 408             }
 409
 410           if (PREDICT_TRUE ((p0 != NULL)))
 411             {
 412               ipsec_bypassed += 1;
 413
 414               pi0 = p0 - im->policies;
 415               vlib_increment_combined_counter (
 416                 &ipsec_spd_policy_counters, thread_index, pi0, 1,
 417                 clib_net_to_host_u16 (ip0->length));
 418
 419               goto trace0;
 420             }
 421           else
 422             {
 423               p0 = 0;
 424               pi0 = ~0;
 425             };
 426
 427           if (search_flow_cache)
 428             {
 429               p0 = ipsec4_input_spd_find_flow_cache_entry (
 430                 im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
 431                 IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
 432             }
 433
 434           else
 435             {
 436               p0 = ipsec_input_policy_match (
 437                 spd0, clib_net_to_host_u32 (ip0->src_address.as_u32),
 438                 clib_net_to_host_u32 (ip0->dst_address.as_u32),
 439                 IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
 440             }
 441
 442           if (PREDICT_TRUE ((p0 != NULL)))
 443             {
 444               ipsec_dropped += 1;
 445
 446               pi0 = p0 - im->policies;
 447               vlib_increment_combined_counter (
 448                 &ipsec_spd_policy_counters, thread_index, pi0, 1,
 449                 clib_net_to_host_u16 (ip0->length));
 450
 451               next[0] = IPSEC_INPUT_NEXT_DROP;
 452               goto trace0;
 453             }
 454           else
 455             {
 456               p0 = 0;
 457               pi0 = ~0;
 458             };
 459
 460           // flow cache search failed, try again with linear search
 461           if (search_flow_cache && p0 == NULL)
 462             {
 463               search_flow_cache = false;
 464               goto esp_or_udp;
 465             }
 466
 467           /* Drop by default if no match on PROTECT, BYPASS or DISCARD */
 468           ipsec_unprocessed += 1;
 469           next[0] = IPSEC_INPUT_NEXT_DROP;
 470
 471         trace0:
 472           if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
 473               PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 474             {
 475               ipsec_input_trace_t *tr =
 476                 vlib_add_trace (vm, node, b[0], sizeof (*tr));
 477
 478               tr->proto = ip0->protocol;
 479               tr->sa_id = p0 ? p0->sa_id : ~0;
 480               tr->spi = has_space0 ? clib_net_to_host_u32 (esp0->spi) : ~0;
 481               tr->seq = has_space0 ? clib_net_to_host_u32 (esp0->seq) : ~0;
 482               tr->spd = spd0->id;
 483               tr->policy_index = pi0;
 484             }
 485         }
 486       else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH)
 487         {
 488           ah0 = (ah_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
 489
 490           // if flow cache is enabled, first search through flow cache for a
 491           // policy match and revert back to linear search on failure
 492           search_flow_cache = im->input_flow_cache_flag;
 493
 494         ah:
 495           if (search_flow_cache)
 496             {
 497               p0 = ipsec4_input_spd_find_flow_cache_entry (
 498                 im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
 499                 IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT);
 500             }
 501
 502           else
 503             {
 504               p0 = ipsec_input_protect_policy_match (
 505                 spd0, clib_net_to_host_u32 (ip0->src_address.as_u32),
 506                 clib_net_to_host_u32 (ip0->dst_address.as_u32),
 507                 clib_net_to_host_u32 (ah0->spi));
 508             }
 509
 510           has_space0 =
 511             vlib_buffer_has_space (b[0],
 512                                    (clib_address_t) (ah0 + 1) -
 513                                    (clib_address_t) ip0);
 514
 515           if (PREDICT_TRUE ((p0 != NULL) & (has_space0)))
 516             {
 517               ipsec_matched += 1;
 518
 519               pi0 = p0 - im->policies;
 520               vlib_increment_combined_counter
 521                 (&ipsec_spd_policy_counters,
 522                  thread_index, pi0, 1, clib_net_to_host_u16 (ip0->length));
 523
 524               vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index;
 525               next[0] = im->ah4_decrypt_next_index;
 526               goto trace1;
 527             }
 528           else
 529             {
 530               p0 = 0;
 531               pi0 = ~0;
 532             }
 533
 534           if (search_flow_cache)
 535             {
 536               p0 = ipsec4_input_spd_find_flow_cache_entry (
 537                 im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
 538                 IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
 539             }
 540
 541           else
 542             {
 543               p0 = ipsec_input_policy_match (
 544                 spd0, clib_net_to_host_u32 (ip0->src_address.as_u32),
 545                 clib_net_to_host_u32 (ip0->dst_address.as_u32),
 546                 IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
 547             }
 548
 549           if (PREDICT_TRUE ((p0 != NULL)))
 550             {
 551               ipsec_bypassed += 1;
 552
 553               pi0 = p0 - im->policies;
 554               vlib_increment_combined_counter (
 555                 &ipsec_spd_policy_counters, thread_index, pi0, 1,
 556                 clib_net_to_host_u16 (ip0->length));
 557
 558               goto trace1;
 559             }
 560           else
 561             {
 562               p0 = 0;
 563               pi0 = ~0;
 564             };
 565
 566           if (search_flow_cache)
 567             {
 568               p0 = ipsec4_input_spd_find_flow_cache_entry (
 569                 im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
 570                 IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
 571             }
 572
 573           else
 574             {
 575               p0 = ipsec_input_policy_match (
 576                 spd0, clib_net_to_host_u32 (ip0->src_address.as_u32),
 577                 clib_net_to_host_u32 (ip0->dst_address.as_u32),
 578                 IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
 579             }
 580
 581           if (PREDICT_TRUE ((p0 != NULL)))
 582             {
 583               ipsec_dropped += 1;
 584
 585               pi0 = p0 - im->policies;
 586               vlib_increment_combined_counter (
 587                 &ipsec_spd_policy_counters, thread_index, pi0, 1,
 588                 clib_net_to_host_u16 (ip0->length));
 589
 590               next[0] = IPSEC_INPUT_NEXT_DROP;
 591               goto trace1;
 592             }
 593           else
 594             {
 595               p0 = 0;
 596               pi0 = ~0;
 597             };
 598
 599           // flow cache search failed, retry with linear search
 600           if (search_flow_cache && p0 == NULL)
 601             {
 602               search_flow_cache = false;
 603               goto ah;
 604             }
 605
 606           /* Drop by default if no match on PROTECT, BYPASS or DISCARD */
 607           ipsec_unprocessed += 1;
 608           next[0] = IPSEC_INPUT_NEXT_DROP;
 609
 610         trace1:
 611           if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
 612               PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
 613             {
 614               ipsec_input_trace_t *tr =
 615                 vlib_add_trace (vm, node, b[0], sizeof (*tr));
 616
 617               tr->proto = ip0->protocol;
 618               tr->sa_id = p0 ? p0->sa_id : ~0;
 619               tr->spi = has_space0 ? clib_net_to_host_u32 (ah0->spi) : ~0;
 620               tr->seq = has_space0 ? clib_net_to_host_u32 (ah0->seq_no) : ~0;
 621               tr->spd = spd0->id;
 622               tr->policy_index = pi0;
 623             }
 624         }
 625       else
 626         {
 627           ipsec_unprocessed += 1;
 628         }
 629       n_left_from -= 1;
 630       b += 1;
 631       next += 1;
 632     }
 633
 634   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
 635
 636   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 637                                IPSEC_INPUT_ERROR_RX_PKTS, frame->n_vectors);
 638
 639   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 640                                IPSEC_INPUT_ERROR_RX_POLICY_MATCH,
 641                                ipsec_matched);
 642
 643   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 644                                IPSEC_INPUT_ERROR_RX_POLICY_NO_MATCH,
 645                                ipsec_unprocessed);
 646
 647   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 648                                IPSEC_INPUT_ERROR_RX_POLICY_DISCARD,
 649                                ipsec_dropped);
 650
 651   vlib_node_increment_counter (vm, ipsec4_input_node.index,
 652                                IPSEC_INPUT_ERROR_RX_POLICY_BYPASS,
 653                                ipsec_bypassed);
 654
 655   return frame->n_vectors;
 656 }
 657
 658
 659 /* *INDENT-OFF* */
 660 VLIB_REGISTER_NODE (ipsec4_input_node) = {
 661   .name = "ipsec4-input-feature",
 662   .vector_size = sizeof (u32),
 663   .format_trace = format_ipsec_input_trace,
 664   .type = VLIB_NODE_TYPE_INTERNAL,
 665   .n_errors = ARRAY_LEN(ipsec_input_error_strings),
 666   .error_strings = ipsec_input_error_strings,
 667   .n_next_nodes = IPSEC_INPUT_N_NEXT,
 668   .next_nodes = {
 669 #define _(s,n) [IPSEC_INPUT_NEXT_##s] = n,
 670     foreach_ipsec_input_next
 671 #undef _
 672   },
 673 };
 674 /* *INDENT-ON* */
 675
 676 extern vlib_node_registration_t ipsec6_input_node;
 677
 678
 679 VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm,
 680                                   vlib_node_runtime_t * node,
 681                                   vlib_frame_t * from_frame)
 682 {
 683   u32 n_left_from, *from, next_index, *to_next, thread_index;
 684   ipsec_main_t *im = &ipsec_main;
 685   u32 ipsec_unprocessed = 0;
 686   u32 ipsec_matched = 0;
 687
 688   from = vlib_frame_vector_args (from_frame);
 689   n_left_from = from_frame->n_vectors;
 690   thread_index = vm->thread_index;
 691
 692   next_index = node->cached_next_index;
 693
 694   while (n_left_from > 0)
 695     {
 696       u32 n_left_to_next;
 697
 698       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 699
 700       while (n_left_from > 0 && n_left_to_next > 0)
 701         {
 702           u32 bi0, next0, pi0;
 703           vlib_buffer_t *b0;
 704           ip6_header_t *ip0;
 705           esp_header_t *esp0;
 706           ip4_ipsec_config_t *c0;
 707           ipsec_spd_t *spd0;
 708           ipsec_policy_t *p0 = 0;
 709           ah_header_t *ah0;
 710           u32 header_size = sizeof (ip0[0]);
 711
 712           bi0 = to_next[0] = from[0];
 713           from += 1;
 714           n_left_from -= 1;
 715           to_next += 1;
 716           n_left_to_next -= 1;
 717
 718           b0 = vlib_get_buffer (vm, bi0);
 719           b0->flags |= VNET_BUFFER_F_IS_IP6;
 720           b0->flags &= ~VNET_BUFFER_F_IS_IP4;
 721           c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0]));
 722
 723           spd0 = pool_elt_at_index (im->spds, c0->spd_index);
 724
 725           ip0 = vlib_buffer_get_current (b0);
 726           esp0 = (esp_header_t *) ((u8 *) ip0 + header_size);
 727           ah0 = (ah_header_t *) ((u8 *) ip0 + header_size);
 728
 729           if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP))
 730             {
 731 #if 0
 732               clib_warning
 733                 ("packet received from %U to %U spi %u size %u spd_id %u",
 734                  format_ip6_address, &ip0->src_address, format_ip6_address,
 735                  &ip0->dst_address, clib_net_to_host_u32 (esp0->spi),
 736                  clib_net_to_host_u16 (ip0->payload_length) + header_size,
 737                  spd0->id);
 738 #endif
 739               p0 = ipsec6_input_protect_policy_match (spd0,
 740                                                       &ip0->src_address,
 741                                                       &ip0->dst_address,
 742                                                       clib_net_to_host_u32
 743                                                       (esp0->spi));
 744
 745               if (PREDICT_TRUE (p0 != 0))
 746                 {
 747                   ipsec_matched += 1;
 748
 749                   pi0 = p0 - im->policies;
 750                   vlib_increment_combined_counter
 751                     (&ipsec_spd_policy_counters,
 752                      thread_index, pi0, 1,
 753                      clib_net_to_host_u16 (ip0->payload_length) +
 754                      header_size);
 755
 756                   vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
 757                   next0 = im->esp6_decrypt_next_index;
 758                   vlib_buffer_advance (b0, header_size);
 759                   goto trace0;
 760                 }
 761               else
 762                 {
 763                   pi0 = ~0;
 764                   ipsec_unprocessed += 1;
 765                   next0 = IPSEC_INPUT_NEXT_DROP;
 766                 }
 767             }
 768           else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH)
 769             {
 770               p0 = ipsec6_input_protect_policy_match (spd0,
 771                                                       &ip0->src_address,
 772                                                       &ip0->dst_address,
 773                                                       clib_net_to_host_u32
 774                                                       (ah0->spi));
 775
 776               if (PREDICT_TRUE (p0 != 0))
 777                 {
 778                   ipsec_matched += 1;
 779                   pi0 = p0 - im->policies;
 780                   vlib_increment_combined_counter
 781                     (&ipsec_spd_policy_counters,
 782                      thread_index, pi0, 1,
 783                      clib_net_to_host_u16 (ip0->payload_length) +
 784                      header_size);
 785
 786                   vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
 787                   next0 = im->ah6_decrypt_next_index;
 788                   goto trace0;
 789                 }
 790               else
 791                 {
 792                   pi0 = ~0;
 793                   ipsec_unprocessed += 1;
 794                   next0 = IPSEC_INPUT_NEXT_DROP;
 795                 }
 796             }
 797           else
 798             {
 799               ipsec_unprocessed += 1;
 800             }
 801
 802         trace0:
 803           if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
 804               PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 805             {
 806               ipsec_input_trace_t *tr =
 807                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 808
 809               if (p0)
 810                 tr->sa_id = p0->sa_id;
 811               tr->proto = ip0->protocol;
 812               tr->spi = clib_net_to_host_u32 (esp0->spi);
 813               tr->seq = clib_net_to_host_u32 (esp0->seq);
 814               tr->spd = spd0->id;
 815             }
 816
 817           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 818                                            n_left_to_next, bi0, next0);
 819         }
 820       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 821     }
 822
 823   vlib_node_increment_counter (vm, ipsec6_input_node.index,
 824                                IPSEC_INPUT_ERROR_RX_PKTS,
 825                                from_frame->n_vectors - ipsec_unprocessed);
 826
 827   vlib_node_increment_counter (vm, ipsec6_input_node.index,
 828                                IPSEC_INPUT_ERROR_RX_POLICY_MATCH,
 829                                ipsec_matched);
 830
 831   return from_frame->n_vectors;
 832 }
 833
 834
 835 /* *INDENT-OFF* */
 836 VLIB_REGISTER_NODE (ipsec6_input_node) = {
 837   .name = "ipsec6-input-feature",
 838   .vector_size = sizeof (u32),
 839   .format_trace = format_ipsec_input_trace,
 840   .type = VLIB_NODE_TYPE_INTERNAL,
 841   .n_errors = ARRAY_LEN(ipsec_input_error_strings),
 842   .error_strings = ipsec_input_error_strings,
 843   .n_next_nodes = IPSEC_INPUT_N_NEXT,
 844   .next_nodes = {
 845 #define _(s,n) [IPSEC_INPUT_NEXT_##s] = n,
 846     foreach_ipsec_input_next
 847 #undef _
 848   },
 849 };
 850 /* *INDENT-ON* */
 851
 852 /*
 853  * fd.io coding-style-patch-verification: ON
 854  *
 855  * Local Variables:
 856  * eval: (c-set-style "gnu")
 857  * End:
 858  */