text: /*
   * esp_decrypt.c : IPSec ESP Decrypt node using DPDK Cryptodev
   *
   * Copyright (c) 2017 Intel and/or its affiliates.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a opy of the License at:
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <vnet/vnet.h>
  #include <vnet/api_errno.h>
  #include <vnet/ip/ip.h>
  
  #include <vnet/ipsec/ipsec.h>
  #include <vnet/ipsec/esp.h>
  #include <dpdk/buffer.h>
  #include <dpdk/ipsec/ipsec.h>
  #include <dpdk/device/dpdk.h>
  #include <dpdk/device/dpdk_priv.h>
  
  #define foreach_esp_decrypt_next	       \
  _(DROP, "error-drop")			       \
  _(IP4_INPUT, "ip4-input-no-checksum")	       \
  _(IP6_INPUT, "ip6-input")
  
  #define _(v, s) ESP_DECRYPT_NEXT_##v,
  typedef enum
  {
    foreach_esp_decrypt_next
  #undef _
      ESP_DECRYPT_N_NEXT,
  } esp_decrypt_next_t;
  
  #define foreach_esp_decrypt_error		 \
   _(RX_PKTS, "ESP pkts received")		 \
   _(DECRYPTION_FAILED, "ESP decryption failed")   \
   _(REPLAY, "SA replayed packet")	         \
   _(NOT_IP, "Not IP packet (dropped)")	         \
   _(ENQ_FAIL, "Enqueue failed (buffer full)")     \
   _(DISCARD, "Not enough crypto operations, discarding frame")  \
   _(BAD_LEN, "Invalid ciphertext length")         \
   _(SESSION, "Failed to get crypto session")      \
   _(NOSUP, "Cipher/Auth not supported")
  
  
  typedef enum
  {
  #define _(sym,str) ESP_DECRYPT_ERROR_##sym,
    foreach_esp_decrypt_error
  #undef _
      ESP_DECRYPT_N_ERROR,
  } esp_decrypt_error_t;
  
  static char *esp_decrypt_error_strings[] = {
  #define _(sym,string) string,
    foreach_esp_decrypt_error
  #undef _
  };
  
  extern vlib_node_registration_t dpdk_esp4_decrypt_node;
  extern vlib_node_registration_t dpdk_esp6_decrypt_node;
  
  typedef struct
  {
    ipsec_crypto_alg_t crypto_alg;
    ipsec_integ_alg_t integ_alg;
    u8 packet_data[64];
  } esp_decrypt_trace_t;
  
  /* packet trace format function */
  static u8 *
  format_esp_decrypt_trace (u8 * s, va_list * args)
  {
    CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
    CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
    esp_decrypt_trace_t *t = va_arg (*args, esp_decrypt_trace_t *);
    u32 indent = format_get_indent (s);
  
    s = format (s, "cipher %U auth %U\n",
  	      format_ipsec_crypto_alg, t->crypto_alg,
  	      format_ipsec_integ_alg, t->integ_alg);
    s = format (s, "%U%U",
  	      format_white_space, indent, format_esp_header, t->packet_data);
    return s;
  }
  
  always_inline uword
  dpdk_esp_decrypt_inline (vlib_main_t * vm,
  			 vlib_node_runtime_t * node,
  			 vlib_frame_t * from_frame, int is_ip6)
  {
    u32 n_left_from, *from, *to_next, next_index, thread_index;
    ipsec_main_t *im = &ipsec_main;
    u32 thread_idx = vlib_get_thread_index ();
    dpdk_crypto_main_t *dcm = &dpdk_crypto_main;
    crypto_resource_t *res = 0;
    ipsec_sa_t *sa0 = 0;
    crypto_alg_t *cipher_alg = 0, *auth_alg = 0;
    struct rte_cryptodev_sym_session *session = 0;
    u32 ret, last_sa_index = ~0;
    u8 numa = rte_socket_id ();
    u8 is_aead = 0;
    crypto_worker_main_t *cwm =
      vec_elt_at_index (dcm->workers_main, thread_idx);
    struct rte_crypto_op **ops = cwm->ops;
  
    from = vlib_frame_vector_args (from_frame);
    n_left_from = from_frame->n_vectors;
    thread_index = vm->thread_index;
  
    ret = crypto_alloc_ops (numa, ops, n_left_from);
    if (ret)
      {
        if (is_ip6)
  	vlib_node_increment_counter (vm, dpdk_esp6_decrypt_node.index,
  				     ESP_DECRYPT_ERROR_DISCARD, 1);
        else
  	vlib_node_increment_counter (vm, dpdk_esp4_decrypt_node.index,
  				     ESP_DECRYPT_ERROR_DISCARD, 1);
        /* Discard whole frame */
        return n_left_from;
      }
  
    next_index = ESP_DECRYPT_NEXT_DROP;
  
    while (n_left_from > 0)
      {
        u32 n_left_to_next;
  
        vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  
        while (n_left_from > 0 && n_left_to_next > 0)
  	{
  	  clib_error_t *error;
  	  u32 bi0, sa_index0, iv_size;
  	  u8 trunc_size;
  	  vlib_buffer_t *b0;
  	  esp_header_t *esp0;
  	  struct rte_mbuf *mb0;
  	  struct rte_crypto_op *op;
  	  u16 res_idx;
  
  	  bi0 = from[0];
  	  from += 1;
  	  n_left_from -= 1;
  
  	  b0 = vlib_get_buffer (vm, bi0);
  	  mb0 = rte_mbuf_from_vlib_buffer (b0);
  	  esp0 = vlib_buffer_get_current (b0);
  
  	  /* ih0/ih6_0 */
  	  CLIB_PREFETCH (esp0, sizeof (esp0[0]) + 16, LOAD);
  	  /* mb0 */
  	  CLIB_PREFETCH (mb0, CLIB_CACHE_LINE_BYTES, STORE);
  
  	  op = ops[0];
  	  ops += 1;
  	  ASSERT (op->status == RTE_CRYPTO_OP_STATUS_NOT_PROCESSED);
  
  	  dpdk_op_priv_t *priv = crypto_op_get_priv (op);
  	  /* store bi in op private */
  	  priv->bi = bi0;
  	  priv->encrypt = 0;
  
  	  u16 op_len =
  	    sizeof (op[0]) + sizeof (op[0].sym[0]) + sizeof (priv[0]);
  	  CLIB_PREFETCH (op, op_len, STORE);
  
  	  sa_index0 = vnet_buffer (b0)->ipsec.sad_index;
  	  vlib_prefetch_combined_counter (&ipsec_sa_counters,
  					  thread_index, sa_index0);
  
  	  if (sa_index0 != last_sa_index)
  	    {
  	      sa0 = pool_elt_at_index (im->sad, sa_index0);
  
  	      cipher_alg =
  		vec_elt_at_index (dcm->cipher_algs, sa0->crypto_alg);
  	      auth_alg = vec_elt_at_index (dcm->auth_algs, sa0->integ_alg);
  
  	      is_aead = (cipher_alg->type == RTE_CRYPTO_SYM_XFORM_AEAD);
  	      if (is_aead)
  		auth_alg = cipher_alg;
  
  	      res_idx = get_resource (cwm, sa0);
  
  	      if (PREDICT_FALSE (res_idx == (u16) ~ 0))
  		{
  		  clib_warning ("unsupported SA by thread index %u",
  				thread_idx);
  		  if (is_ip6)
  		    vlib_node_increment_counter (vm,
  						 dpdk_esp6_decrypt_node.index,
  						 ESP_DECRYPT_ERROR_NOSUP, 1);
  		  else
  		    vlib_node_increment_counter (vm,
  						 dpdk_esp4_decrypt_node.index,
  						 ESP_DECRYPT_ERROR_NOSUP, 1);
  		  to_next[0] = bi0;
  		  to_next += 1;
  		  n_left_to_next -= 1;
  		  goto trace;
  		}
  	      res = vec_elt_at_index (dcm->resource, res_idx);
  
  	      error = crypto_get_session (&session, sa_index0, res, cwm, 0);
  	      if (PREDICT_FALSE (error || !session))
  		{
  		  clib_warning ("failed to get crypto session");
  		  if (is_ip6)
  		    vlib_node_increment_counter (vm,
  						 dpdk_esp6_decrypt_node.index,
  						 ESP_DECRYPT_ERROR_SESSION,
  						 1);
  		  else
  		    vlib_node_increment_counter (vm,
  						 dpdk_esp4_decrypt_node.index,
  						 ESP_DECRYPT_ERROR_SESSION,
  						 1);
  		  to_next[0] = bi0;
  		  to_next += 1;
  		  n_left_to_next -= 1;
  		  goto trace;
  		}
  
  	      last_sa_index = sa_index0;
  	    }
  
  	  /* anti-replay check */
  	  if (ipsec_sa_anti_replay_check
  	      (sa0, clib_host_to_net_u32 (esp0->seq)))
  	    {
  	      clib_warning ("failed anti-replay check");
  	      if (is_ip6)
  		vlib_node_increment_counter (vm,
  					     dpdk_esp6_decrypt_node.index,
  					     ESP_DECRYPT_ERROR_REPLAY, 1);
  	      else
  		vlib_node_increment_counter (vm,
  					     dpdk_esp4_decrypt_node.index,
  					     ESP_DECRYPT_ERROR_REPLAY, 1);
  	      to_next[0] = bi0;
  	      to_next += 1;
  	      n_left_to_next -= 1;
  	      goto trace;
  	    }
  
  	  if (is_ip6)
  	    priv->next = DPDK_CRYPTO_INPUT_NEXT_DECRYPT6_POST;
  	  else
  	    priv->next = DPDK_CRYPTO_INPUT_NEXT_DECRYPT4_POST;
  
  	  /* FIXME multi-seg */
  	  vlib_increment_combined_counter
  	    (&ipsec_sa_counters, thread_index, sa_index0,
  	     1, b0->current_length);
  
  	  res->ops[res->n_ops] = op;
  	  res->bi[res->n_ops] = bi0;
  	  res->n_ops += 1;
  
  	  /* Convert vlib buffer to mbuf */
  	  mb0->data_len = b0->current_length;
  	  mb0->pkt_len = b0->current_length;
  	  mb0->data_off = RTE_PKTMBUF_HEADROOM + b0->current_data;
  
  	  trunc_size = auth_alg->trunc_size;
  	  iv_size = cipher_alg->iv_len;
  
  	  /* Outer IP header has already been stripped */
  	  u16 payload_len =
  	    b0->current_length - sizeof (esp_header_t) - iv_size - trunc_size;
  
  	  ASSERT (payload_len >= 4);
  
  	  if (payload_len & (cipher_alg->boundary - 1))
  	    {
  	      clib_warning ("payload %u not multiple of %d\n",
  			    payload_len, cipher_alg->boundary);
  	      if (is_ip6)
  		vlib_node_increment_counter (vm, dpdk_esp6_decrypt_node.index,
  					     ESP_DECRYPT_ERROR_BAD_LEN, 1);
  	      else
  		vlib_node_increment_counter (vm, dpdk_esp4_decrypt_node.index,
  					     ESP_DECRYPT_ERROR_BAD_LEN, 1);
  	      res->n_ops -= 1;
  	      to_next[0] = bi0;
  	      to_next += 1;
  	      n_left_to_next -= 1;
  	      goto trace;
  	    }
  
  	  u32 cipher_off, cipher_len;
  	  u32 auth_len = 0;
  	  u8 *aad = NULL;
  
  	  u8 *iv = (u8 *) (esp0 + 1);
  
  	  dpdk_gcm_cnt_blk *icb = &priv->cb;
  
  	  cipher_off = sizeof (esp_header_t) + iv_size;
  	  cipher_len = payload_len;
  
  	  u8 *digest = vlib_buffer_get_tail (b0) - trunc_size;
  	  u64 digest_paddr =
  	    mb0->buf_physaddr + digest - ((u8 *) mb0->buf_addr);
  
  	  if (!is_aead && cipher_alg->alg == RTE_CRYPTO_CIPHER_AES_CBC)
  	    clib_memcpy_fast (icb, iv, 16);
  	  else			/* CTR/GCM */
  	    {
  	      u32 *_iv = (u32 *) iv;
  
  	      crypto_set_icb (icb, sa0->salt, _iv[0], _iv[1]);
  	    }
  
  	  if (is_aead)
  	    {
  	      aad = priv->aad;
  	      u32 *_aad = (u32 *) aad;
  	      clib_memcpy_fast (aad, esp0, 8);
  
  	      /* _aad[3] should always be 0 */
  	      if (PREDICT_FALSE (ipsec_sa_is_set_USE_ESN (sa0)))
  		_aad[2] = clib_host_to_net_u32 (sa0->seq_hi);
  	      else
  		_aad[2] = 0;
  	    }
  	  else
  	    {
  	      auth_len = sizeof (esp_header_t) + iv_size + payload_len;
  
  	      if (ipsec_sa_is_set_USE_ESN (sa0))
  		{
  		  clib_memcpy_fast (priv->icv, digest, trunc_size);
  		  u32 *_digest = (u32 *) digest;
  		  _digest[0] = clib_host_to_net_u32 (sa0->seq_hi);
  		  auth_len += sizeof (sa0->seq_hi);
  
  		  digest = priv->icv;
  		  digest_paddr =
  		    op->phys_addr + (uintptr_t) priv->icv - (uintptr_t) op;
  		}
  	    }
  
  	  crypto_op_setup (is_aead, mb0, op, session, cipher_off, cipher_len,
  			   0, auth_len, aad, digest, digest_paddr);
  	trace:
  	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
  	    {
  	      esp_decrypt_trace_t *tr =
  		vlib_add_trace (vm, node, b0, sizeof (*tr));
  	      tr->crypto_alg = sa0->crypto_alg;
  	      tr->integ_alg = sa0->integ_alg;
  	      clib_memcpy_fast (tr->packet_data, vlib_buffer_get_current (b0),
  				sizeof (esp_header_t));
  	    }
  	}
        vlib_put_next_frame (vm, node, next_index, n_left_to_next);
      }
  
    if (is_ip6)
      {
        vlib_node_increment_counter (vm, dpdk_esp6_decrypt_node.index,
  				   ESP_DECRYPT_ERROR_RX_PKTS,
  				   from_frame->n_vectors);
  
        crypto_enqueue_ops (vm, cwm, dpdk_esp6_decrypt_node.index,
  			  ESP_DECRYPT_ERROR_ENQ_FAIL, numa, 0 /* encrypt */ );
      }
    else
      {
        vlib_node_increment_counter (vm, dpdk_esp4_decrypt_node.index,
  				   ESP_DECRYPT_ERROR_RX_PKTS,
  				   from_frame->n_vectors);
  
        crypto_enqueue_ops (vm, cwm, dpdk_esp4_decrypt_node.index,
  			  ESP_DECRYPT_ERROR_ENQ_FAIL, numa, 0 /* encrypt */ );
      }
  
    crypto_free_ops (numa, ops, cwm->ops + from_frame->n_vectors - ops);
  
    return from_frame->n_vectors;
  }
  
  VLIB_NODE_FN (dpdk_esp4_decrypt_node) (vlib_main_t * vm,
  				       vlib_node_runtime_t * node,
  				       vlib_frame_t * from_frame)
  {
    return dpdk_esp_decrypt_inline (vm, node, from_frame, 0 /*is_ip6 */ );
  }
  
  /* *INDENT-OFF* */
  VLIB_REGISTER_NODE (dpdk_esp4_decrypt_node) = {
    .name = "dpdk-esp4-decrypt",
    .vector_size = sizeof (u32),
    .format_trace = format_esp_decrypt_trace,
    .type = VLIB_NODE_TYPE_INTERNAL,
  
    .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
    .error_strings = esp_decrypt_error_strings,
  
    .n_next_nodes = ESP_DECRYPT_N_NEXT,
    .next_nodes = {
  #define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
      foreach_esp_decrypt_next
  #undef _
    },
  };
  /* *INDENT-ON* */
  
  VLIB_NODE_FN (dpdk_esp6_decrypt_node) (vlib_main_t * vm,
  				       vlib_node_runtime_t * node,
  				       vlib_frame_t * from_frame)
  {
    return dpdk_esp_decrypt_inline (vm, node, from_frame, 1 /*is_ip6 */ );
  }
  
  /* *INDENT-OFF* */
  VLIB_REGISTER_NODE (dpdk_esp6_decrypt_node) = {
    .name = "dpdk-esp6-decrypt",
    .vector_size = sizeof (u32),
    .format_trace = format_esp_decrypt_trace,
    .type = VLIB_NODE_TYPE_INTERNAL,
  
    .n_errors = ARRAY_LEN(esp_decrypt_error_strings),
    .error_strings = esp_decrypt_error_strings,
  
    .n_next_nodes = ESP_DECRYPT_N_NEXT,
    .next_nodes = {
  #define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
      foreach_esp_decrypt_next
  #undef _
    },
  };
  /* *INDENT-ON* */
  
  /*
   * Decrypt Post Node
   */
  
  #define foreach_esp_decrypt_post_error	      \
   _(PKTS, "ESP post pkts")
  
  typedef enum
  {
  #define _(sym,str) ESP_DECRYPT_POST_ERROR_##sym,
    foreach_esp_decrypt_post_error
  #undef _
      ESP_DECRYPT_POST_N_ERROR,
  } esp_decrypt_post_error_t;
  
  static char *esp_decrypt_post_error_strings[] = {
  #define _(sym,string) string,
    foreach_esp_decrypt_post_error
  #undef _
  };
  
  extern vlib_node_registration_t dpdk_esp4_decrypt_post_node;
  extern vlib_node_registration_t dpdk_esp6_decrypt_post_node;
  
  static u8 *
  format_esp_decrypt_post_trace (u8 * s, va_list * args)
  {
    CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
    CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
    esp_decrypt_trace_t *t = va_arg (*args, esp_decrypt_trace_t *);
    u32 indent = format_get_indent (s);
  
    s = format (s, "cipher %U auth %U\n",
  	      format_ipsec_crypto_alg, t->crypto_alg,
  	      format_ipsec_integ_alg, t->integ_alg);
  
    ip4_header_t *ih4 = (ip4_header_t *) t->packet_data;
    if ((ih4->ip_version_and_header_length & 0xF0) == 0x60)
      s =
        format (s, "%U%U", format_white_space, indent, format_ip6_header, ih4);
    else
      s =
        format (s, "%U%U", format_white_space, indent, format_ip4_header, ih4);
  
    return s;
  }
  
  always_inline uword
  dpdk_esp_decrypt_post_inline (vlib_main_t * vm,
  			      vlib_node_runtime_t * node,
  			      vlib_frame_t * from_frame, int is_ip6)
  {
    u32 n_left_from, *from, *to_next = 0, next_index;
    ipsec_sa_t *sa0;
    u32 sa_index0 = ~0;
    ipsec_main_t *im = &ipsec_main;
    dpdk_crypto_main_t *dcm = &dpdk_crypto_main;
  
    from = vlib_frame_vector_args (from_frame);
    n_left_from = from_frame->n_vectors;
  
    next_index = node->cached_next_index;
  
    while (n_left_from > 0)
      {
        u32 n_left_to_next;
  
        vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  
        while (n_left_from > 0 && n_left_to_next > 0)
  	{
  	  esp_footer_t *f0;
  	  u32 bi0, iv_size, next0;
  	  vlib_buffer_t *b0 = 0;
  	  ip4_header_t *ih4 = 0, *oh4 = 0;
  	  ip6_header_t *ih6 = 0, *oh6 = 0;
  	  crypto_alg_t *cipher_alg, *auth_alg;
  	  esp_header_t *esp0;
  	  u8 trunc_size, is_aead;
  	  u16 udp_encap_adv = 0;
  
  	  next0 = ESP_DECRYPT_NEXT_DROP;
  
  	  bi0 = from[0];
  	  from += 1;
  	  n_left_from -= 1;
  	  n_left_to_next -= 1;
  
  	  b0 = vlib_get_buffer (vm, bi0);
  	  esp0 = vlib_buffer_get_current (b0);
  
  	  sa_index0 = vnet_buffer (b0)->ipsec.sad_index;
  	  sa0 = pool_elt_at_index (im->sad, sa_index0);
  
  	  to_next[0] = bi0;
  	  to_next += 1;
  
  	  cipher_alg = vec_elt_at_index (dcm->cipher_algs, sa0->crypto_alg);
  	  auth_alg = vec_elt_at_index (dcm->auth_algs, sa0->integ_alg);
  	  is_aead = cipher_alg->type == RTE_CRYPTO_SYM_XFORM_AEAD;
  	  if (is_aead)
  	    auth_alg = cipher_alg;
  
  	  trunc_size = auth_alg->trunc_size;
  
  	  iv_size = cipher_alg->iv_len;
  
  	  ipsec_sa_anti_replay_advance (sa0,
  					clib_host_to_net_u32 (esp0->seq));
  
  	  /* if UDP encapsulation is used adjust the address of the IP header */
  	  if (ipsec_sa_is_set_UDP_ENCAP (sa0)
  	      && (b0->flags & VNET_BUFFER_F_IS_IP4))
  	    {
  	      udp_encap_adv = sizeof (udp_header_t);
  	    }
  
  	  if (b0->flags & VNET_BUFFER_F_IS_IP4)
  	    ih4 = (ip4_header_t *)
  	      ((u8 *) esp0 - udp_encap_adv - sizeof (ip4_header_t));
  	  else
  	    ih4 = (ip4_header_t *) ((u8 *) esp0 - sizeof (ip6_header_t));
  
  	  vlib_buffer_advance (b0, sizeof (esp_header_t) + iv_size);
  
  	  b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
  	  f0 = (esp_footer_t *) (vlib_buffer_get_tail (b0) - trunc_size - 2);
  	  b0->current_length -= (f0->pad_length + trunc_size + 2);
  #if 0
  	  /* check padding */
  	  const u8 *padding = vlib_buffer_get_tail (b0);
  	  if (PREDICT_FALSE (memcmp (padding, pad_data, f0->pad_length)))
  	    {
  	      clib_warning ("bad padding");
  	      vlib_node_increment_counter (vm, dpdk_esp_decrypt_node.index,
  					   ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
  					   1);
  	      goto trace;
  	    }
  #endif
  	  if (ipsec_sa_is_set_IS_TUNNEL (sa0))
  	    {
  	      if (f0->next_header == IP_PROTOCOL_IP_IN_IP)
  		next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
  	      else if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa0)
  		       && f0->next_header == IP_PROTOCOL_IPV6)
  		next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
  	      else
  		{
  		  clib_warning ("next header: 0x%x", f0->next_header);
  		  if (is_ip6)
  		    vlib_node_increment_counter (vm,
  						 dpdk_esp6_decrypt_node.index,
  						 ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
  						 1);
  		  else
  		    vlib_node_increment_counter (vm,
  						 dpdk_esp4_decrypt_node.index,
  						 ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
  						 1);
  		  goto trace;
  		}
  	    }
  	  else			/* transport mode */
  	    {
  	      if ((ih4->ip_version_and_header_length & 0xF0) == 0x40)
  		{
  		  u16 ih4_len = ip4_header_bytes (ih4);
  		  vlib_buffer_advance (b0, -ih4_len - udp_encap_adv);
  		  next0 = ESP_DECRYPT_NEXT_IP4_INPUT;
  		  if (!ipsec_sa_is_set_UDP_ENCAP (sa0))
  		    {
  		      oh4 = vlib_buffer_get_current (b0);
  		      memmove (oh4, ih4, ih4_len);
  		      oh4->protocol = f0->next_header;
  		      oh4->length = clib_host_to_net_u16 (b0->current_length);
  		      oh4->checksum = ip4_header_checksum (oh4);
  		    }
  		}
  	      else if ((ih4->ip_version_and_header_length & 0xF0) == 0x60)
  		{
  		  ih6 = (ip6_header_t *) ih4;
  		  vlib_buffer_advance (b0, -sizeof (ip6_header_t));
  		  oh6 = vlib_buffer_get_current (b0);
  		  memmove (oh6, ih6, sizeof (ip6_header_t));
  
  		  next0 = ESP_DECRYPT_NEXT_IP6_INPUT;
  		  oh6->protocol = f0->next_header;
  		  u16 len = b0->current_length - sizeof (ip6_header_t);
  		  oh6->payload_length = clib_host_to_net_u16 (len);
  		}
  	      else
  		{
  		  clib_warning ("next header: 0x%x", f0->next_header);
  		  if (is_ip6)
  		    vlib_node_increment_counter (vm,
  						 dpdk_esp6_decrypt_node.index,
  						 ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
  						 1);
  		  else
  		    vlib_node_increment_counter (vm,
  						 dpdk_esp4_decrypt_node.index,
  						 ESP_DECRYPT_ERROR_DECRYPTION_FAILED,
  						 1);
  		  goto trace;
  		}
  	    }
  
  	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
  
  	trace:
  	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
  	    {
  	      esp_decrypt_trace_t *tr =
  		vlib_add_trace (vm, node, b0, sizeof (*tr));
  	      tr->crypto_alg = sa0->crypto_alg;
  	      tr->integ_alg = sa0->integ_alg;
  	      ih4 = vlib_buffer_get_current (b0);
  	      clib_memcpy_fast (tr->packet_data, ih4, sizeof (ip6_header_t));
  	    }
  
  	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
  					   to_next, n_left_to_next, bi0,
  					   next0);
  	}
        vlib_put_next_frame (vm, node, next_index, n_left_to_next);
      }
  
    if (is_ip6)
      vlib_node_increment_counter (vm, dpdk_esp6_decrypt_post_node.index,
  				 ESP_DECRYPT_POST_ERROR_PKTS,
  				 from_frame->n_vectors);
    else
      vlib_node_increment_counter (vm, dpdk_esp4_decrypt_post_node.index,
  				 ESP_DECRYPT_POST_ERROR_PKTS,
  				 from_frame->n_vectors);
  
    return from_frame->n_vectors;
  }
  
  VLIB_NODE_FN (dpdk_esp4_decrypt_post_node) (vlib_main_t * vm,
  					    vlib_node_runtime_t * node,
  					    vlib_frame_t * from_frame)
  {
    return dpdk_esp_decrypt_post_inline (vm, node, from_frame, 0 /*is_ip6 */ );
  }
  
  /* *INDENT-OFF* */
  VLIB_REGISTER_NODE (dpdk_esp4_decrypt_post_node) = {
    .name = "dpdk-esp4-decrypt-post",
    .vector_size = sizeof (u32),
    .format_trace = format_esp_decrypt_post_trace,
    .type = VLIB_NODE_TYPE_INTERNAL,
  
    .n_errors = ARRAY_LEN(esp_decrypt_post_error_strings),
    .error_strings = esp_decrypt_post_error_strings,
  
    .n_next_nodes = ESP_DECRYPT_N_NEXT,
    .next_nodes = {
  #define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
      foreach_esp_decrypt_next
  #undef _
    },
  };
  /* *INDENT-ON* */
  
  VLIB_NODE_FN (dpdk_esp6_decrypt_post_node) (vlib_main_t * vm,
  					    vlib_node_runtime_t * node,
  					    vlib_frame_t * from_frame)
  {
    return dpdk_esp_decrypt_post_inline (vm, node, from_frame, 0 /*is_ip6 */ );
  }
  
  /* *INDENT-OFF* */
  VLIB_REGISTER_NODE (dpdk_esp6_decrypt_post_node) = {
    .name = "dpdk-esp6-decrypt-post",
    .vector_size = sizeof (u32),
    .format_trace = format_esp_decrypt_post_trace,
    .type = VLIB_NODE_TYPE_INTERNAL,
  
    .n_errors = ARRAY_LEN(esp_decrypt_post_error_strings),
    .error_strings = esp_decrypt_post_error_strings,
  
    .n_next_nodes = ESP_DECRYPT_N_NEXT,
    .next_nodes = {
  #define _(s,n) [ESP_DECRYPT_NEXT_##s] = n,
      foreach_esp_decrypt_next
  #undef _
    },
  };
  /* *INDENT-ON* */
  
  /*
   * fd.io coding-style-patch-verification: ON
   *
   * Local Variables:
   * eval: (c-set-style "gnu")
   * End:
   */
  