src/plugins/dpdk/ipsec/esp_encrypt.c

   1 /*
   2  * esp_encrypt.c : IPSec ESP encrypt node using DPDK Cryptodev
   3  *
   4  * Copyright (c) 2016 Intel 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
  22 #include <vnet/ipsec/ipsec.h>
  23 #include <dpdk/ipsec/ipsec.h>
  24 #include <dpdk/ipsec/esp.h>
  25 #include <dpdk/device/dpdk.h>
  26 #include <dpdk/device/dpdk_priv.h>
  27
  28 #define foreach_esp_encrypt_next                   \
  29 _(DROP, "error-drop")                              \
  30 _(IP4_LOOKUP, "ip4-lookup")                        \
  31 _(IP6_LOOKUP, "ip6-lookup")                        \
  32 _(INTERFACE_OUTPUT, "interface-output")
  33
  34 #define _(v, s) ESP_ENCRYPT_NEXT_##v,
  35 typedef enum
  36 {
  37   foreach_esp_encrypt_next
  38 #undef _
  39     ESP_ENCRYPT_N_NEXT,
  40 } esp_encrypt_next_t;
  41
  42 #define foreach_esp_encrypt_error                   \
  43  _(RX_PKTS, "ESP pkts received")                    \
  44  _(SEQ_CYCLED, "sequence number cycled")            \
  45  _(ENQ_FAIL, "Enqueue failed (buffer full)")        \
  46  _(NO_CRYPTODEV, "Cryptodev not configured")        \
  47  _(UNSUPPORTED, "Cipher/Auth not supported")
  48
  49
  50 typedef enum
  51 {
  52 #define _(sym,str) ESP_ENCRYPT_ERROR_##sym,
  53   foreach_esp_encrypt_error
  54 #undef _
  55     ESP_ENCRYPT_N_ERROR,
  56 } esp_encrypt_error_t;
  57
  58 static char *esp_encrypt_error_strings[] = {
  59 #define _(sym,string) string,
  60   foreach_esp_encrypt_error
  61 #undef _
  62 };
  63
  64 vlib_node_registration_t dpdk_esp_encrypt_node;
  65
  66 typedef struct
  67 {
  68   u32 spi;
  69   u32 seq;
  70   ipsec_crypto_alg_t crypto_alg;
  71   ipsec_integ_alg_t integ_alg;
  72 } esp_encrypt_trace_t;
  73
  74 /* packet trace format function */
  75 static u8 *
  76 format_esp_encrypt_trace (u8 * s, va_list * args)
  77 {
  78   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  79   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  80   esp_encrypt_trace_t *t = va_arg (*args, esp_encrypt_trace_t *);
  81
  82   s = format (s, "esp: spi %u seq %u crypto %U integrity %U",
  83               t->spi, t->seq,
  84               format_ipsec_crypto_alg, t->crypto_alg,
  85               format_ipsec_integ_alg, t->integ_alg);
  86   return s;
  87 }
  88
  89 static uword
  90 dpdk_esp_encrypt_node_fn (vlib_main_t * vm,
  91                           vlib_node_runtime_t * node,
  92                           vlib_frame_t * from_frame)
  93 {
  94   u32 n_left_from, *from, *to_next, next_index;
  95   ipsec_main_t *im = &ipsec_main;
  96   u32 thread_index = vlib_get_thread_index ();
  97   dpdk_crypto_main_t *dcm = &dpdk_crypto_main;
  98   dpdk_esp_main_t *em = &dpdk_esp_main;
  99   u32 i;
 100
 101   from = vlib_frame_vector_args (from_frame);
 102   n_left_from = from_frame->n_vectors;
 103
 104   if (PREDICT_FALSE (!dcm->workers_main))
 105     {
 106       /* Likely there are not enough cryptodevs, so drop frame */
 107       vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
 108                                    ESP_ENCRYPT_ERROR_NO_CRYPTODEV,
 109                                    n_left_from);
 110       vlib_buffer_free (vm, from, n_left_from);
 111       return n_left_from;
 112     }
 113
 114   crypto_worker_main_t *cwm =
 115     vec_elt_at_index (dcm->workers_main, thread_index);
 116   u32 n_qps = vec_len (cwm->qp_data);
 117   struct rte_crypto_op **cops_to_enq[n_qps];
 118   u32 n_cop_qp[n_qps], *bi_to_enq[n_qps];
 119
 120   for (i = 0; i < n_qps; i++)
 121     {
 122       bi_to_enq[i] = cwm->qp_data[i].bi;
 123       cops_to_enq[i] = cwm->qp_data[i].cops;
 124     }
 125
 126   memset (n_cop_qp, 0, n_qps * sizeof (u32));
 127
 128   crypto_alloc_cops ();
 129
 130   next_index = ESP_ENCRYPT_NEXT_DROP;
 131
 132   while (n_left_from > 0)
 133     {
 134       u32 n_left_to_next;
 135
 136       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 137
 138       while (n_left_from > 0 && n_left_to_next > 0)
 139         {
 140           u32 bi0, next0;
 141           vlib_buffer_t *b0 = 0;
 142           u32 sa_index0;
 143           ipsec_sa_t *sa0;
 144           ip4_and_esp_header_t *ih0, *oh0 = 0;
 145           ip6_and_esp_header_t *ih6_0, *oh6_0 = 0;
 146           struct rte_mbuf *mb0 = 0;
 147           esp_footer_t *f0;
 148           u8 is_ipv6;
 149           u8 ip_hdr_size;
 150           u8 next_hdr_type;
 151           u8 transport_mode = 0;
 152           const int BLOCK_SIZE = 16;
 153           u32 iv_size;
 154           u16 orig_sz;
 155           crypto_sa_session_t *sa_sess;
 156           void *sess;
 157           struct rte_crypto_op *cop = 0;
 158           u16 qp_index;
 159
 160           bi0 = from[0];
 161           from += 1;
 162           n_left_from -= 1;
 163
 164           b0 = vlib_get_buffer (vm, bi0);
 165           sa_index0 = vnet_buffer (b0)->ipsec.sad_index;
 166           sa0 = pool_elt_at_index (im->sad, sa_index0);
 167
 168           if (PREDICT_FALSE (esp_seq_advance (sa0)))
 169             {
 170               clib_warning ("sequence number counter has cycled SPI %u",
 171                             sa0->spi);
 172               vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
 173                                            ESP_ENCRYPT_ERROR_SEQ_CYCLED, 1);
 174               //TODO: rekey SA
 175               to_next[0] = bi0;
 176               to_next += 1;
 177               n_left_to_next -= 1;
 178               goto trace;
 179             }
 180
 181           sa0->total_data_size += b0->current_length;
 182
 183           sa_sess = pool_elt_at_index (cwm->sa_sess_d[1], sa_index0);
 184           if (PREDICT_FALSE (!sa_sess->sess))
 185             {
 186               int ret = create_sym_sess (sa0, sa_sess, 1);
 187
 188               if (PREDICT_FALSE (ret))
 189                 {
 190                   to_next[0] = bi0;
 191                   to_next += 1;
 192                   n_left_to_next -= 1;
 193                   goto trace;
 194                 }
 195             }
 196
 197           qp_index = sa_sess->qp_index;
 198           sess = sa_sess->sess;
 199
 200           ASSERT (vec_len (vec_elt (cwm->qp_data, qp_index).free_cops) > 0);
 201           cop = vec_pop (vec_elt (cwm->qp_data, qp_index).free_cops);
 202           ASSERT (cop->status == RTE_CRYPTO_OP_STATUS_NOT_PROCESSED);
 203
 204           cops_to_enq[qp_index][0] = cop;
 205           cops_to_enq[qp_index] += 1;
 206           n_cop_qp[qp_index] += 1;
 207           bi_to_enq[qp_index][0] = bi0;
 208           bi_to_enq[qp_index] += 1;
 209
 210           ssize_t adv;
 211           iv_size = em->esp_crypto_algs[sa0->crypto_alg].iv_len;
 212           ih0 = vlib_buffer_get_current (b0);
 213           orig_sz = b0->current_length;
 214           is_ipv6 = (ih0->ip4.ip_version_and_header_length & 0xF0) == 0x60;
 215           /* is ipv6 */
 216           if (PREDICT_TRUE (sa0->is_tunnel))
 217             {
 218               if (PREDICT_TRUE (!is_ipv6))
 219                 adv = -sizeof (ip4_and_esp_header_t);
 220               else
 221                 adv = -sizeof (ip6_and_esp_header_t);
 222             }
 223           else
 224             {
 225               adv = -sizeof (esp_header_t);
 226               if (PREDICT_TRUE (!is_ipv6))
 227                 orig_sz -= sizeof (ip4_header_t);
 228               else
 229                 orig_sz -= sizeof (ip6_header_t);
 230             }
 231
 232           /*transport mode save the eth header before it is overwritten */
 233           if (PREDICT_FALSE (!sa0->is_tunnel))
 234             {
 235               ethernet_header_t *ieh0 = (ethernet_header_t *)
 236                 ((u8 *) vlib_buffer_get_current (b0) -
 237                  sizeof (ethernet_header_t));
 238               ethernet_header_t *oeh0 =
 239                 (ethernet_header_t *) ((u8 *) ieh0 + (adv - iv_size));
 240               clib_memcpy (oeh0, ieh0, sizeof (ethernet_header_t));
 241             }
 242
 243           vlib_buffer_advance (b0, adv - iv_size);
 244
 245           /* XXX IP6/ip4 and IP4/IP6 not supported, only IP4/IP4 and IP6/IP6 */
 246
 247           /* is ipv6 */
 248           if (PREDICT_FALSE (is_ipv6))
 249             {
 250               ih6_0 = (ip6_and_esp_header_t *) ih0;
 251               ip_hdr_size = sizeof (ip6_header_t);
 252               oh6_0 = vlib_buffer_get_current (b0);
 253
 254               if (PREDICT_TRUE (sa0->is_tunnel))
 255                 {
 256                   next_hdr_type = IP_PROTOCOL_IPV6;
 257                   oh6_0->ip6.ip_version_traffic_class_and_flow_label =
 258                     ih6_0->ip6.ip_version_traffic_class_and_flow_label;
 259                 }
 260               else
 261                 {
 262                   next_hdr_type = ih6_0->ip6.protocol;
 263                   memmove (oh6_0, ih6_0, sizeof (ip6_header_t));
 264                 }
 265
 266               oh6_0->ip6.protocol = IP_PROTOCOL_IPSEC_ESP;
 267               oh6_0->ip6.hop_limit = 254;
 268               oh6_0->esp.spi = clib_net_to_host_u32 (sa0->spi);
 269               oh6_0->esp.seq = clib_net_to_host_u32 (sa0->seq);
 270             }
 271           else
 272             {
 273               ip_hdr_size = sizeof (ip4_header_t);
 274               oh0 = vlib_buffer_get_current (b0);
 275
 276               if (PREDICT_TRUE (sa0->is_tunnel))
 277                 {
 278                   next_hdr_type = IP_PROTOCOL_IP_IN_IP;
 279                   oh0->ip4.tos = ih0->ip4.tos;
 280                 }
 281               else
 282                 {
 283                   next_hdr_type = ih0->ip4.protocol;
 284                   memmove (oh0, ih0, sizeof (ip4_header_t));
 285                 }
 286
 287               oh0->ip4.ip_version_and_header_length = 0x45;
 288               oh0->ip4.fragment_id = 0;
 289               oh0->ip4.flags_and_fragment_offset = 0;
 290               oh0->ip4.ttl = 254;
 291               oh0->ip4.protocol = IP_PROTOCOL_IPSEC_ESP;
 292               oh0->esp.spi = clib_net_to_host_u32 (sa0->spi);
 293               oh0->esp.seq = clib_net_to_host_u32 (sa0->seq);
 294             }
 295
 296           if (PREDICT_TRUE (sa0->is_tunnel && !sa0->is_tunnel_ip6))
 297             {
 298               oh0->ip4.src_address.as_u32 = sa0->tunnel_src_addr.ip4.as_u32;
 299               oh0->ip4.dst_address.as_u32 = sa0->tunnel_dst_addr.ip4.as_u32;
 300
 301               /* in tunnel mode send it back to FIB */
 302               next0 = ESP_ENCRYPT_NEXT_IP4_LOOKUP;
 303               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 304             }
 305           else if (sa0->is_tunnel && sa0->is_tunnel_ip6)
 306             {
 307               oh6_0->ip6.src_address.as_u64[0] =
 308                 sa0->tunnel_src_addr.ip6.as_u64[0];
 309               oh6_0->ip6.src_address.as_u64[1] =
 310                 sa0->tunnel_src_addr.ip6.as_u64[1];
 311               oh6_0->ip6.dst_address.as_u64[0] =
 312                 sa0->tunnel_dst_addr.ip6.as_u64[0];
 313               oh6_0->ip6.dst_address.as_u64[1] =
 314                 sa0->tunnel_dst_addr.ip6.as_u64[1];
 315
 316               /* in tunnel mode send it back to FIB */
 317               next0 = ESP_ENCRYPT_NEXT_IP6_LOOKUP;
 318               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 319             }
 320           else
 321             {
 322               next0 = ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT;
 323               transport_mode = 1;
 324             }
 325
 326           ASSERT (sa0->crypto_alg < IPSEC_CRYPTO_N_ALG);
 327           ASSERT (sa0->crypto_alg != IPSEC_CRYPTO_ALG_NONE);
 328
 329           int blocks = 1 + (orig_sz + 1) / BLOCK_SIZE;
 330
 331           /* pad packet in input buffer */
 332           u8 pad_bytes = BLOCK_SIZE * blocks - 2 - orig_sz;
 333           u8 i;
 334           u8 *padding = vlib_buffer_get_current (b0) + b0->current_length;
 335
 336           for (i = 0; i < pad_bytes; ++i)
 337             padding[i] = i + 1;
 338
 339           f0 = vlib_buffer_get_current (b0) + b0->current_length + pad_bytes;
 340           f0->pad_length = pad_bytes;
 341           f0->next_header = next_hdr_type;
 342           b0->current_length += pad_bytes + 2 +
 343             em->esp_integ_algs[sa0->integ_alg].trunc_size;
 344
 345           vnet_buffer (b0)->sw_if_index[VLIB_RX] =
 346             vnet_buffer (b0)->sw_if_index[VLIB_RX];
 347           b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 348
 349           struct rte_crypto_sym_op *sym_cop;
 350           sym_cop = (struct rte_crypto_sym_op *) (cop + 1);
 351
 352           dpdk_cop_priv_t *priv = (dpdk_cop_priv_t *) (sym_cop + 1);
 353
 354           vnet_buffer (b0)->unused[0] = next0;
 355
 356           mb0 = rte_mbuf_from_vlib_buffer (b0);
 357           mb0->data_len = b0->current_length;
 358           mb0->pkt_len = b0->current_length;
 359           mb0->data_off = RTE_PKTMBUF_HEADROOM + b0->current_data;
 360
 361           rte_crypto_op_attach_sym_session (cop, sess);
 362
 363           sym_cop->m_src = mb0;
 364
 365           dpdk_gcm_cnt_blk *icb = &priv->cb;
 366           icb->salt = sa0->salt;
 367           icb->iv[0] = sa0->seq;
 368           icb->iv[1] = sa0->seq_hi;
 369
 370           if (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128)
 371             {
 372               icb->cnt = clib_host_to_net_u32 (1);
 373               clib_memcpy (vlib_buffer_get_current (b0) + ip_hdr_size +
 374                            sizeof (esp_header_t), icb->iv, 8);
 375               sym_cop->cipher.data.offset =
 376                 ip_hdr_size + sizeof (esp_header_t) + iv_size;
 377               sym_cop->cipher.data.length = BLOCK_SIZE * blocks;
 378               sym_cop->cipher.iv.length = 16;
 379             }
 380           else
 381             {
 382               sym_cop->cipher.data.offset =
 383                 ip_hdr_size + sizeof (esp_header_t);
 384               sym_cop->cipher.data.length = BLOCK_SIZE * blocks + iv_size;
 385               sym_cop->cipher.iv.length = iv_size;
 386             }
 387
 388           sym_cop->cipher.iv.data = (u8 *) icb;
 389           sym_cop->cipher.iv.phys_addr = cop->phys_addr + (uintptr_t) icb
 390             - (uintptr_t) cop;
 391
 392
 393           ASSERT (sa0->integ_alg < IPSEC_INTEG_N_ALG);
 394           ASSERT (sa0->integ_alg != IPSEC_INTEG_ALG_NONE);
 395
 396           if (PREDICT_FALSE (sa0->integ_alg == IPSEC_INTEG_ALG_AES_GCM_128))
 397             {
 398               u8 *aad = priv->aad;
 399               clib_memcpy (aad, vlib_buffer_get_current (b0) + ip_hdr_size,
 400                            8);
 401               sym_cop->auth.aad.data = aad;
 402               sym_cop->auth.aad.phys_addr = cop->phys_addr +
 403                 (uintptr_t) aad - (uintptr_t) cop;
 404
 405               if (PREDICT_FALSE (sa0->use_esn))
 406                 {
 407                   *((u32 *) & aad[8]) = sa0->seq_hi;
 408                   sym_cop->auth.aad.length = 12;
 409                 }
 410               else
 411                 {
 412                   sym_cop->auth.aad.length = 8;
 413                 }
 414             }
 415           else
 416             {
 417               sym_cop->auth.data.offset = ip_hdr_size;
 418               sym_cop->auth.data.length = b0->current_length - ip_hdr_size
 419                 - em->esp_integ_algs[sa0->integ_alg].trunc_size;
 420
 421               if (PREDICT_FALSE (sa0->use_esn))
 422                 {
 423                   u8 *payload_end =
 424                     vlib_buffer_get_current (b0) + b0->current_length;
 425                   *((u32 *) payload_end) = sa0->seq_hi;
 426                   sym_cop->auth.data.length += sizeof (sa0->seq_hi);
 427                 }
 428             }
 429           sym_cop->auth.digest.data = vlib_buffer_get_current (b0) +
 430             b0->current_length -
 431             em->esp_integ_algs[sa0->integ_alg].trunc_size;
 432           sym_cop->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset (mb0,
 433                                                                        b0->current_length
 434                                                                        -
 435                                                                        em->esp_integ_algs
 436                                                                        [sa0->integ_alg].trunc_size);
 437           sym_cop->auth.digest.length =
 438             em->esp_integ_algs[sa0->integ_alg].trunc_size;
 439
 440
 441           if (PREDICT_FALSE (is_ipv6))
 442             {
 443               oh6_0->ip6.payload_length =
 444                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
 445                                       sizeof (ip6_header_t));
 446             }
 447           else
 448             {
 449               oh0->ip4.length =
 450                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
 451               oh0->ip4.checksum = ip4_header_checksum (&oh0->ip4);
 452             }
 453
 454           if (transport_mode)
 455             vlib_buffer_advance (b0, -sizeof (ethernet_header_t));
 456
 457         trace:
 458           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 459             {
 460               esp_encrypt_trace_t *tr =
 461                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 462               tr->spi = sa0->spi;
 463               tr->seq = sa0->seq - 1;
 464               tr->crypto_alg = sa0->crypto_alg;
 465               tr->integ_alg = sa0->integ_alg;
 466             }
 467         }
 468       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 469     }
 470   vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
 471                                ESP_ENCRYPT_ERROR_RX_PKTS,
 472                                from_frame->n_vectors);
 473   crypto_qp_data_t *qpd;
 474   /* *INDENT-OFF* */
 475   vec_foreach_index (i, cwm->qp_data)
 476     {
 477       u32 enq;
 478
 479       qpd = vec_elt_at_index(cwm->qp_data, i);
 480       enq = rte_cryptodev_enqueue_burst(qpd->dev_id, qpd->qp_id,
 481                                         qpd->cops, n_cop_qp[i]);
 482       qpd->inflights += enq;
 483
 484       if (PREDICT_FALSE(enq < n_cop_qp[i]))
 485         {
 486           crypto_free_cop (qpd, &qpd->cops[enq], n_cop_qp[i] - enq);
 487           vlib_buffer_free (vm, &qpd->bi[enq], n_cop_qp[i] - enq);
 488
 489           vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
 490                                        ESP_ENCRYPT_ERROR_ENQ_FAIL,
 491                                        n_cop_qp[i] - enq);
 492         }
 493     }
 494   /* *INDENT-ON* */
 495
 496   return from_frame->n_vectors;
 497 }
 498
 499 VLIB_REGISTER_NODE (dpdk_esp_encrypt_node) =
 500 {
 501   .function = dpdk_esp_encrypt_node_fn,.name = "dpdk-esp-encrypt",.flags =
 502     VLIB_NODE_FLAG_IS_OUTPUT,.vector_size = sizeof (u32),.format_trace =
 503     format_esp_encrypt_trace,.n_errors =
 504     ARRAY_LEN (esp_encrypt_error_strings),.error_strings =
 505     esp_encrypt_error_strings,.n_next_nodes = 1,.next_nodes =
 506   {
 507   [ESP_ENCRYPT_NEXT_DROP] = "error-drop",}
 508 };
 509
 510 VLIB_NODE_FUNCTION_MULTIARCH (dpdk_esp_encrypt_node, dpdk_esp_encrypt_node_fn)
 511 /*
 512  * ESP Encrypt Post Node
 513  */
 514 #define foreach_esp_encrypt_post_error              \
 515  _(PKTS, "ESP post pkts")
 516      typedef enum
 517      {
 518 #define _(sym,str) ESP_ENCRYPT_POST_ERROR_##sym,
 519        foreach_esp_encrypt_post_error
 520 #undef _
 521          ESP_ENCRYPT_POST_N_ERROR,
 522      } esp_encrypt_post_error_t;
 523
 524      static char *esp_encrypt_post_error_strings[] = {
 525 #define _(sym,string) string,
 526        foreach_esp_encrypt_post_error
 527 #undef _
 528      };
 529
 530 vlib_node_registration_t dpdk_esp_encrypt_post_node;
 531
 532 static u8 *
 533 format_esp_encrypt_post_trace (u8 * s, va_list * args)
 534 {
 535   return s;
 536 }
 537
 538 static uword
 539 dpdk_esp_encrypt_post_node_fn (vlib_main_t * vm,
 540                                vlib_node_runtime_t * node,
 541                                vlib_frame_t * from_frame)
 542 {
 543   u32 n_left_from, *from, *to_next = 0, next_index;
 544
 545   from = vlib_frame_vector_args (from_frame);
 546   n_left_from = from_frame->n_vectors;
 547
 548   next_index = node->cached_next_index;
 549
 550   while (n_left_from > 0)
 551     {
 552       u32 n_left_to_next;
 553
 554       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 555
 556       while (n_left_from > 0 && n_left_to_next > 0)
 557         {
 558           u32 bi0, next0;
 559           vlib_buffer_t *b0 = 0;
 560
 561           bi0 = from[0];
 562           from += 1;
 563           n_left_from -= 1;
 564           n_left_to_next -= 1;
 565
 566           b0 = vlib_get_buffer (vm, bi0);
 567
 568           to_next[0] = bi0;
 569           to_next += 1;
 570
 571           next0 = vnet_buffer (b0)->unused[0];
 572
 573           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 574                                            to_next, n_left_to_next, bi0,
 575                                            next0);
 576         }
 577       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 578     }
 579
 580   vlib_node_increment_counter (vm, dpdk_esp_encrypt_post_node.index,
 581                                ESP_ENCRYPT_POST_ERROR_PKTS,
 582                                from_frame->n_vectors);
 583
 584   return from_frame->n_vectors;
 585 }
 586
 587 VLIB_REGISTER_NODE (dpdk_esp_encrypt_post_node) =
 588 {
 589   .function = dpdk_esp_encrypt_post_node_fn,.name =
 590     "dpdk-esp-encrypt-post",.vector_size = sizeof (u32),.format_trace =
 591     format_esp_encrypt_post_trace,.type = VLIB_NODE_TYPE_INTERNAL,.n_errors =
 592     ARRAY_LEN (esp_encrypt_post_error_strings),.error_strings =
 593     esp_encrypt_post_error_strings,.n_next_nodes =
 594     ESP_ENCRYPT_N_NEXT,.next_nodes =
 595   {
 596 #define _(s,n) [ESP_ENCRYPT_NEXT_##s] = n,
 597     foreach_esp_encrypt_next
 598 #undef _
 599   }
 600 };
 601
 602 VLIB_NODE_FUNCTION_MULTIARCH (dpdk_esp_encrypt_post_node,
 603                               dpdk_esp_encrypt_post_node_fn)
 604 /*
 605  * fd.io coding-style-patch-verification: ON
 606  *
 607  * Local Variables:
 608  * eval: (c-set-style "gnu")
 609  * End:
 610  */