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