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           sa0->total_data_size += b0->current_length;
 181
 182           sa_sess = pool_elt_at_index (cwm->sa_sess_d[1], sa_index0);
 183           if (PREDICT_FALSE (!sa_sess->sess))
 184             {
 185               int ret = create_sym_sess (sa0, sa_sess, 1);
 186
 187               if (PREDICT_FALSE (ret))
 188                 {
 189                   to_next[0] = bi0;
 190                   to_next += 1;
 191                   n_left_to_next -= 1;
 192                   goto trace;
 193                 }
 194             }
 195
 196           qp_index = sa_sess->qp_index;
 197           sess = sa_sess->sess;
 198
 199           ASSERT (vec_len (vec_elt (cwm->qp_data, qp_index).free_cops) > 0);
 200           cop = vec_pop (vec_elt (cwm->qp_data, qp_index).free_cops);
 201           ASSERT (cop->status == RTE_CRYPTO_OP_STATUS_NOT_PROCESSED);
 202
 203           cops_to_enq[qp_index][0] = cop;
 204           cops_to_enq[qp_index] += 1;
 205           n_cop_qp[qp_index] += 1;
 206           bi_to_enq[qp_index][0] = bi0;
 207           bi_to_enq[qp_index] += 1;
 208
 209           ssize_t adv;
 210           iv_size = em->esp_crypto_algs[sa0->crypto_alg].iv_len;
 211           ih0 = vlib_buffer_get_current (b0);
 212           orig_sz = b0->current_length;
 213           is_ipv6 = (ih0->ip4.ip_version_and_header_length & 0xF0) == 0x60;
 214           /* is ipv6 */
 215           if (PREDICT_TRUE (sa0->is_tunnel))
 216             {
 217               if (PREDICT_TRUE (!is_ipv6))
 218                 adv = -sizeof (ip4_and_esp_header_t);
 219               else
 220                 adv = -sizeof (ip6_and_esp_header_t);
 221             }
 222           else
 223             {
 224               adv = -sizeof (esp_header_t);
 225               if (PREDICT_TRUE (!is_ipv6))
 226                 orig_sz -= sizeof (ip4_header_t);
 227               else
 228                 orig_sz -= sizeof (ip6_header_t);
 229             }
 230
 231           /*transport mode save the eth header before it is overwritten */
 232           if (PREDICT_FALSE (!sa0->is_tunnel))
 233             {
 234               ethernet_header_t *ieh0 = (ethernet_header_t *)
 235                 ((u8 *) vlib_buffer_get_current (b0) -
 236                  sizeof (ethernet_header_t));
 237               ethernet_header_t *oeh0 =
 238                 (ethernet_header_t *) ((u8 *) ieh0 + (adv - iv_size));
 239               clib_memcpy (oeh0, ieh0, sizeof (ethernet_header_t));
 240             }
 241
 242           vlib_buffer_advance (b0, adv - iv_size);
 243
 244           /* XXX IP6/ip4 and IP4/IP6 not supported, only IP4/IP4 and IP6/IP6 */
 245
 246           /* is ipv6 */
 247           if (PREDICT_FALSE (is_ipv6))
 248             {
 249               ih6_0 = (ip6_and_esp_header_t *) ih0;
 250               ip_hdr_size = sizeof (ip6_header_t);
 251               oh6_0 = vlib_buffer_get_current (b0);
 252
 253               if (PREDICT_TRUE (sa0->is_tunnel))
 254                 {
 255                   next_hdr_type = IP_PROTOCOL_IPV6;
 256                   oh6_0->ip6.ip_version_traffic_class_and_flow_label =
 257                     ih6_0->ip6.ip_version_traffic_class_and_flow_label;
 258                 }
 259               else
 260                 {
 261                   next_hdr_type = ih6_0->ip6.protocol;
 262                   memmove (oh6_0, ih6_0, sizeof (ip6_header_t));
 263                 }
 264
 265               oh6_0->ip6.protocol = IP_PROTOCOL_IPSEC_ESP;
 266               oh6_0->ip6.hop_limit = 254;
 267               oh6_0->esp.spi = clib_net_to_host_u32 (sa0->spi);
 268               oh6_0->esp.seq = clib_net_to_host_u32 (sa0->seq);
 269             }
 270           else
 271             {
 272               ip_hdr_size = sizeof (ip4_header_t);
 273               oh0 = vlib_buffer_get_current (b0);
 274
 275               if (PREDICT_TRUE (sa0->is_tunnel))
 276                 {
 277                   next_hdr_type = IP_PROTOCOL_IP_IN_IP;
 278                   oh0->ip4.tos = ih0->ip4.tos;
 279                 }
 280               else
 281                 {
 282                   next_hdr_type = ih0->ip4.protocol;
 283                   memmove (oh0, ih0, sizeof (ip4_header_t));
 284                 }
 285
 286               oh0->ip4.ip_version_and_header_length = 0x45;
 287               oh0->ip4.fragment_id = 0;
 288               oh0->ip4.flags_and_fragment_offset = 0;
 289               oh0->ip4.ttl = 254;
 290               oh0->ip4.protocol = IP_PROTOCOL_IPSEC_ESP;
 291               oh0->esp.spi = clib_net_to_host_u32 (sa0->spi);
 292               oh0->esp.seq = clib_net_to_host_u32 (sa0->seq);
 293             }
 294
 295           if (PREDICT_TRUE (sa0->is_tunnel && !sa0->is_tunnel_ip6))
 296             {
 297               oh0->ip4.src_address.as_u32 = sa0->tunnel_src_addr.ip4.as_u32;
 298               oh0->ip4.dst_address.as_u32 = sa0->tunnel_dst_addr.ip4.as_u32;
 299
 300               /* in tunnel mode send it back to FIB */
 301               next0 = ESP_ENCRYPT_NEXT_IP4_LOOKUP;
 302               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 303             }
 304           else if (sa0->is_tunnel && sa0->is_tunnel_ip6)
 305             {
 306               oh6_0->ip6.src_address.as_u64[0] =
 307                 sa0->tunnel_src_addr.ip6.as_u64[0];
 308               oh6_0->ip6.src_address.as_u64[1] =
 309                 sa0->tunnel_src_addr.ip6.as_u64[1];
 310               oh6_0->ip6.dst_address.as_u64[0] =
 311                 sa0->tunnel_dst_addr.ip6.as_u64[0];
 312               oh6_0->ip6.dst_address.as_u64[1] =
 313                 sa0->tunnel_dst_addr.ip6.as_u64[1];
 314
 315               /* in tunnel mode send it back to FIB */
 316               next0 = ESP_ENCRYPT_NEXT_IP6_LOOKUP;
 317               vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
 318             }
 319           else
 320             {
 321               next0 = ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT;
 322               transport_mode = 1;
 323             }
 324
 325           ASSERT (sa0->crypto_alg < IPSEC_CRYPTO_N_ALG);
 326           ASSERT (sa0->crypto_alg != IPSEC_CRYPTO_ALG_NONE);
 327
 328           int blocks = 1 + (orig_sz + 1) / BLOCK_SIZE;
 329
 330           /* pad packet in input buffer */
 331           u8 pad_bytes = BLOCK_SIZE * blocks - 2 - orig_sz;
 332           u8 i;
 333           u8 *padding = vlib_buffer_get_current (b0) + b0->current_length;
 334
 335           for (i = 0; i < pad_bytes; ++i)
 336             padding[i] = i + 1;
 337
 338           f0 = vlib_buffer_get_current (b0) + b0->current_length + pad_bytes;
 339           f0->pad_length = pad_bytes;
 340           f0->next_header = next_hdr_type;
 341           b0->current_length += pad_bytes + 2 +
 342             em->esp_integ_algs[sa0->integ_alg].trunc_size;
 343
 344           vnet_buffer (b0)->sw_if_index[VLIB_RX] =
 345             vnet_buffer (b0)->sw_if_index[VLIB_RX];
 346           b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
 347
 348           struct rte_crypto_sym_op *sym_cop;
 349           sym_cop = (struct rte_crypto_sym_op *) (cop + 1);
 350
 351           dpdk_cop_priv_t *priv = (dpdk_cop_priv_t *) (sym_cop + 1);
 352
 353           vnet_buffer (b0)->unused[0] = next0;
 354
 355           mb0 = rte_mbuf_from_vlib_buffer (b0);
 356           mb0->data_len = b0->current_length;
 357           mb0->pkt_len = b0->current_length;
 358           mb0->data_off = RTE_PKTMBUF_HEADROOM + b0->current_data;
 359
 360           rte_crypto_op_attach_sym_session (cop, sess);
 361
 362           sym_cop->m_src = mb0;
 363
 364           dpdk_gcm_cnt_blk *icb = &priv->cb;
 365           icb->salt = sa0->salt;
 366           icb->iv[0] = sa0->seq;
 367           icb->iv[1] = sa0->seq_hi;
 368
 369           if (sa0->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128)
 370             {
 371               icb->cnt = clib_host_to_net_u32 (1);
 372               clib_memcpy (vlib_buffer_get_current (b0) + ip_hdr_size +
 373                            sizeof (esp_header_t), icb->iv, 8);
 374               sym_cop->cipher.data.offset =
 375                 ip_hdr_size + sizeof (esp_header_t) + iv_size;
 376               sym_cop->cipher.data.length = BLOCK_SIZE * blocks;
 377               sym_cop->cipher.iv.length = 16;
 378             }
 379           else
 380             {
 381               sym_cop->cipher.data.offset =
 382                 ip_hdr_size + sizeof (esp_header_t);
 383               sym_cop->cipher.data.length = BLOCK_SIZE * blocks + iv_size;
 384               sym_cop->cipher.iv.length = iv_size;
 385             }
 386
 387           sym_cop->cipher.iv.data = (u8 *) icb;
 388           sym_cop->cipher.iv.phys_addr = cop->phys_addr + (uintptr_t) icb
 389             - (uintptr_t) cop;
 390
 391
 392           ASSERT (sa0->integ_alg < IPSEC_INTEG_N_ALG);
 393           ASSERT (sa0->integ_alg != IPSEC_INTEG_ALG_NONE);
 394
 395           if (PREDICT_FALSE (sa0->integ_alg == IPSEC_INTEG_ALG_AES_GCM_128))
 396             {
 397               u8 *aad = priv->aad;
 398               clib_memcpy (aad, vlib_buffer_get_current (b0) + ip_hdr_size,
 399                            8);
 400               sym_cop->auth.aad.data = aad;
 401               sym_cop->auth.aad.phys_addr = cop->phys_addr +
 402                 (uintptr_t) aad - (uintptr_t) cop;
 403
 404               if (PREDICT_FALSE (sa0->use_esn))
 405                 {
 406                   *((u32 *) & aad[8]) = sa0->seq_hi;
 407                   sym_cop->auth.aad.length = 12;
 408                 }
 409               else
 410                 {
 411                   sym_cop->auth.aad.length = 8;
 412                 }
 413             }
 414           else
 415             {
 416               sym_cop->auth.data.offset = ip_hdr_size;
 417               sym_cop->auth.data.length = b0->current_length - ip_hdr_size
 418                 - em->esp_integ_algs[sa0->integ_alg].trunc_size;
 419
 420               if (PREDICT_FALSE (sa0->use_esn))
 421                 {
 422                   u8 *payload_end =
 423                     vlib_buffer_get_current (b0) + b0->current_length;
 424                   *((u32 *) payload_end) = sa0->seq_hi;
 425                   sym_cop->auth.data.length += sizeof (sa0->seq_hi);
 426                 }
 427             }
 428           sym_cop->auth.digest.data = vlib_buffer_get_current (b0) +
 429             b0->current_length -
 430             em->esp_integ_algs[sa0->integ_alg].trunc_size;
 431           sym_cop->auth.digest.phys_addr = rte_pktmbuf_mtophys_offset (mb0,
 432                                                                        b0->current_length
 433                                                                        -
 434                                                                        em->esp_integ_algs
 435                                                                        [sa0->integ_alg].trunc_size);
 436           sym_cop->auth.digest.length =
 437             em->esp_integ_algs[sa0->integ_alg].trunc_size;
 438
 439
 440           if (PREDICT_FALSE (is_ipv6))
 441             {
 442               oh6_0->ip6.payload_length =
 443                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
 444                                       sizeof (ip6_header_t));
 445             }
 446           else
 447             {
 448               oh0->ip4.length =
 449                 clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
 450               oh0->ip4.checksum = ip4_header_checksum (&oh0->ip4);
 451             }
 452
 453           if (transport_mode)
 454             vlib_buffer_advance (b0, -sizeof (ethernet_header_t));
 455
 456         trace:
 457           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 458             {
 459               esp_encrypt_trace_t *tr =
 460                 vlib_add_trace (vm, node, b0, sizeof (*tr));
 461               tr->spi = sa0->spi;
 462               tr->seq = sa0->seq - 1;
 463               tr->crypto_alg = sa0->crypto_alg;
 464               tr->integ_alg = sa0->integ_alg;
 465             }
 466         }
 467       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 468     }
 469   vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
 470                                ESP_ENCRYPT_ERROR_RX_PKTS,
 471                                from_frame->n_vectors);
 472   crypto_qp_data_t *qpd;
 473   /* *INDENT-OFF* */
 474   vec_foreach_index (i, cwm->qp_data)
 475     {
 476       u32 enq;
 477
 478       qpd = vec_elt_at_index(cwm->qp_data, i);
 479       enq = rte_cryptodev_enqueue_burst(qpd->dev_id, qpd->qp_id,
 480                                         qpd->cops, n_cop_qp[i]);
 481       qpd->inflights += enq;
 482
 483       if (PREDICT_FALSE(enq < n_cop_qp[i]))
 484         {
 485           crypto_free_cop (qpd, &qpd->cops[enq], n_cop_qp[i] - enq);
 486           vlib_buffer_free (vm, &qpd->bi[enq], n_cop_qp[i] - enq);
 487
 488           vlib_node_increment_counter (vm, dpdk_esp_encrypt_node.index,
 489                                        ESP_ENCRYPT_ERROR_ENQ_FAIL,
 490                                        n_cop_qp[i] - enq);
 491         }
 492     }
 493   /* *INDENT-ON* */
 494
 495   return from_frame->n_vectors;
 496 }
 497
 498 VLIB_REGISTER_NODE (dpdk_esp_encrypt_node) =
 499 {
 500   .function = dpdk_esp_encrypt_node_fn,.name = "dpdk-esp-encrypt",.flags =
 501     VLIB_NODE_FLAG_IS_OUTPUT,.vector_size = sizeof (u32),.format_trace =
 502     format_esp_encrypt_trace,.n_errors =
 503     ARRAY_LEN (esp_encrypt_error_strings),.error_strings =
 504     esp_encrypt_error_strings,.n_next_nodes = 1,.next_nodes =
 505   {
 506   [ESP_ENCRYPT_NEXT_DROP] = "error-drop",}
 507 };
 508
 509 VLIB_NODE_FUNCTION_MULTIARCH (dpdk_esp_encrypt_node, dpdk_esp_encrypt_node_fn)
 510 /*
 511  * ESP Encrypt Post Node
 512  */
 513 #define foreach_esp_encrypt_post_error              \
 514  _(PKTS, "ESP post pkts")
 515      typedef enum
 516      {
 517 #define _(sym,str) ESP_ENCRYPT_POST_ERROR_##sym,
 518        foreach_esp_encrypt_post_error
 519 #undef _
 520          ESP_ENCRYPT_POST_N_ERROR,
 521      } esp_encrypt_post_error_t;
 522
 523      static char *esp_encrypt_post_error_strings[] = {
 524 #define _(sym,string) string,
 525        foreach_esp_encrypt_post_error
 526 #undef _
 527      };
 528
 529 vlib_node_registration_t dpdk_esp_encrypt_post_node;
 530
 531 static u8 *
 532 format_esp_encrypt_post_trace (u8 * s, va_list * args)
 533 {
 534   return s;
 535 }
 536
 537 static uword
 538 dpdk_esp_encrypt_post_node_fn (vlib_main_t * vm,
 539                                vlib_node_runtime_t * node,
 540                                vlib_frame_t * from_frame)
 541 {
 542   u32 n_left_from, *from, *to_next = 0, next_index;
 543
 544   from = vlib_frame_vector_args (from_frame);
 545   n_left_from = from_frame->n_vectors;
 546
 547   next_index = node->cached_next_index;
 548
 549   while (n_left_from > 0)
 550     {
 551       u32 n_left_to_next;
 552
 553       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
 554
 555       while (n_left_from > 0 && n_left_to_next > 0)
 556         {
 557           u32 bi0, next0;
 558           vlib_buffer_t *b0 = 0;
 559
 560           bi0 = from[0];
 561           from += 1;
 562           n_left_from -= 1;
 563           n_left_to_next -= 1;
 564
 565           b0 = vlib_get_buffer (vm, bi0);
 566
 567           to_next[0] = bi0;
 568           to_next += 1;
 569
 570           next0 = vnet_buffer (b0)->unused[0];
 571
 572           vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
 573                                            to_next, n_left_to_next, bi0,
 574                                            next0);
 575         }
 576       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 577     }
 578
 579   vlib_node_increment_counter (vm, dpdk_esp_encrypt_post_node.index,
 580                                ESP_ENCRYPT_POST_ERROR_PKTS,
 581                                from_frame->n_vectors);
 582
 583   return from_frame->n_vectors;
 584 }
 585
 586 VLIB_REGISTER_NODE (dpdk_esp_encrypt_post_node) =
 587 {
 588   .function = dpdk_esp_encrypt_post_node_fn,.name =
 589     "dpdk-esp-encrypt-post",.vector_size = sizeof (u32),.format_trace =
 590     format_esp_encrypt_post_trace,.type = VLIB_NODE_TYPE_INTERNAL,.n_errors =
 591     ARRAY_LEN (esp_encrypt_post_error_strings),.error_strings =
 592     esp_encrypt_post_error_strings,.n_next_nodes =
 593     ESP_ENCRYPT_N_NEXT,.next_nodes =
 594   {
 595 #define _(s,n) [ESP_ENCRYPT_NEXT_##s] = n,
 596     foreach_esp_encrypt_next
 597 #undef _
 598   }
 599 };
 600
 601 VLIB_NODE_FUNCTION_MULTIARCH (dpdk_esp_encrypt_post_node,
 602                               dpdk_esp_encrypt_post_node_fn)
 603 /*
 604  * fd.io coding-style-patch-verification: ON
 605  *
 606  * Local Variables:
 607  * eval: (c-set-style "gnu")
 608  * End:
 609  */