text: /*
   * esp_decrypt.c : IPSec ESP decrypt node
   *
   * Copyright (c) 2015 Cisco 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 copy 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 <vnet/ipsec/ipsec_io.h>
  #include <vnet/ipsec/ipsec_tun.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")                  \
   _(INTEG_ERROR, "Integrity check failed")                       \
   _(CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \
   _(REPLAY, "SA replayed packet")                                \
   _(RUNT, "undersized packet")                                   \
   _(CHAINED_BUFFER, "chained buffers (packet dropped)")          \
   _(OVERSIZED_HEADER, "buffer with oversized header (dropped)")  \
   _(NO_TAIL_SPACE, "no enough buffer tail space (dropped)")      \
   _(TUN_NO_PROTO, "no tunnel protocol")                          \
  
  
  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 _
  };
  
  typedef struct
  {
    u32 seq;
    u32 sa_seq;
    u32 sa_seq_hi;
    ipsec_crypto_alg_t crypto_alg;
    ipsec_integ_alg_t integ_alg;
  } 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 *);
  
    s =
      format (s,
  	    "esp: crypto %U integrity %U pkt-seq %d sa-seq %u sa-seq-hi %u",
  	    format_ipsec_crypto_alg, t->crypto_alg, format_ipsec_integ_alg,
  	    t->integ_alg, t->seq, t->sa_seq, t->sa_seq_hi);
    return s;
  }
  
  typedef struct
  {
    union
    {
      struct
      {
        u8 icv_sz;
        u8 iv_sz;
        ipsec_sa_flags_t flags;
        u32 sa_index;
      };
      u64 sa_data;
    };
  
    u32 seq;
    i16 current_data;
    i16 current_length;
    u16 hdr_sz;
  } esp_decrypt_packet_data_t;
  
  STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 3 * sizeof (u64));
  
  #define ESP_ENCRYPT_PD_F_FD_TRANSPORT (1 << 2)
  
  always_inline uword
  esp_decrypt_inline (vlib_main_t * vm,
  		    vlib_node_runtime_t * node, vlib_frame_t * from_frame,
  		    int is_ip6, int is_tun)
  {
    ipsec_main_t *im = &ipsec_main;
    u32 thread_index = vm->thread_index;
    u16 buffer_data_size = vlib_buffer_get_default_data_size (vm);
    u16 len;
    ipsec_per_thread_data_t *ptd = vec_elt_at_index (im->ptd, thread_index);
    u32 *from = vlib_frame_vector_args (from_frame);
    u32 n, n_left = from_frame->n_vectors;
    vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
    u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
    esp_decrypt_packet_data_t pkt_data[VLIB_FRAME_SIZE], *pd = pkt_data;
    esp_decrypt_packet_data_t cpd = { };
    u32 current_sa_index = ~0, current_sa_bytes = 0, current_sa_pkts = 0;
    const u8 esp_sz = sizeof (esp_header_t);
    ipsec_sa_t *sa0 = 0;
  
    vlib_get_buffers (vm, from, b, n_left);
    vec_reset_length (ptd->crypto_ops);
    vec_reset_length (ptd->integ_ops);
    clib_memset_u16 (nexts, -1, n_left);
  
    while (n_left > 0)
      {
        u8 *payload;
  
        if (n_left > 2)
  	{
  	  u8 *p;
  	  vlib_prefetch_buffer_header (b[2], LOAD);
  	  p = vlib_buffer_get_current (b[1]);
  	  CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
  	  p -= CLIB_CACHE_LINE_BYTES;
  	  CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
  	}
  
        if (vlib_buffer_chain_linearize (vm, b[0]) != 1)
  	{
  	  b[0]->error = node->errors[ESP_DECRYPT_ERROR_CHAINED_BUFFER];
  	  next[0] = ESP_DECRYPT_NEXT_DROP;
  	  goto next;
  	}
  
        if (vnet_buffer (b[0])->ipsec.sad_index != current_sa_index)
  	{
  	  if (current_sa_pkts)
  	    vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
  					     current_sa_index,
  					     current_sa_pkts,
  					     current_sa_bytes);
  	  current_sa_bytes = current_sa_pkts = 0;
  
  	  current_sa_index = vnet_buffer (b[0])->ipsec.sad_index;
  	  sa0 = pool_elt_at_index (im->sad, current_sa_index);
  	  cpd.icv_sz = sa0->integ_icv_size;
  	  cpd.iv_sz = sa0->crypto_iv_size;
  	  cpd.flags = sa0->flags;
  	  cpd.sa_index = current_sa_index;
  	}
  
        /* store packet data for next round for easier prefetch */
        pd->sa_data = cpd.sa_data;
        pd->current_data = b[0]->current_data;
        pd->current_length = b[0]->current_length;
        pd->hdr_sz = pd->current_data - vnet_buffer (b[0])->l3_hdr_offset;
        payload = b[0]->data + pd->current_data;
        pd->seq = clib_host_to_net_u32 (((esp_header_t *) payload)->seq);
  
        /* we need 4 extra bytes for HMAC calculation when ESN are used */
        if (ipsec_sa_is_set_USE_ESN (sa0) && pd->icv_sz &&
  	  (pd->current_data + pd->current_length + 4 > buffer_data_size))
  	{
  	  b[0]->error = node->errors[ESP_DECRYPT_ERROR_NO_TAIL_SPACE];
  	  next[0] = ESP_DECRYPT_NEXT_DROP;
  	  goto next;
  	}
  
        /* anti-reply check */
        if (ipsec_sa_anti_replay_check (sa0, pd->seq))
  	{
  	  b[0]->error = node->errors[ESP_DECRYPT_ERROR_REPLAY];
  	  next[0] = ESP_DECRYPT_NEXT_DROP;
  	  goto next;
  	}
  
        if (pd->current_length < cpd.icv_sz + esp_sz + cpd.iv_sz)
  	{
  	  b[0]->error = node->errors[ESP_DECRYPT_ERROR_RUNT];
  	  next[0] = ESP_DECRYPT_NEXT_DROP;
  	  goto next;
  	}
  
        len = pd->current_length - cpd.icv_sz;
        current_sa_pkts += 1;
        current_sa_bytes += pd->current_length;
  
        if (PREDICT_TRUE (sa0->integ_op_id != VNET_CRYPTO_OP_NONE))
  	{
  	  vnet_crypto_op_t *op;
  	  vec_add2_aligned (ptd->integ_ops, op, 1, CLIB_CACHE_LINE_BYTES);
  
  	  vnet_crypto_op_init (op, sa0->integ_op_id);
  	  op->key_index = sa0->integ_key_index;
  	  op->src = payload;
  	  op->flags = VNET_CRYPTO_OP_FLAG_HMAC_CHECK;
  	  op->user_data = b - bufs;
  	  op->digest = payload + len;
  	  op->digest_len = cpd.icv_sz;
  	  op->len = len;
  	  if (ipsec_sa_is_set_USE_ESN (sa0))
  	    {
  	      /* shift ICV by 4 bytes to insert ESN */
  	      u32 seq_hi = clib_host_to_net_u32 (sa0->seq_hi);
  	      u8 tmp[ESP_MAX_ICV_SIZE], sz = sizeof (sa0->seq_hi);
  	      clib_memcpy_fast (tmp, payload + len, ESP_MAX_ICV_SIZE);
  	      clib_memcpy_fast (payload + len, &seq_hi, sz);
  	      clib_memcpy_fast (payload + len + sz, tmp, ESP_MAX_ICV_SIZE);
  	      op->len += sz;
  	      op->digest += sz;
  	    }
  	}
  
        payload += esp_sz;
        len -= esp_sz;
  
        if (sa0->crypto_enc_op_id != VNET_CRYPTO_OP_NONE)
  	{
  	  vnet_crypto_op_t *op;
  	  vec_add2_aligned (ptd->crypto_ops, op, 1, CLIB_CACHE_LINE_BYTES);
  	  vnet_crypto_op_init (op, sa0->crypto_dec_op_id);
  	  op->key_index = sa0->crypto_key_index;
  	  op->iv = payload;
  
  	  if (ipsec_sa_is_set_IS_AEAD (sa0))
  	    {
  	      esp_header_t *esp0;
  	      esp_aead_t *aad;
  	      u8 *scratch;
  
  	      /*
  	       * construct the AAD and the nonce (Salt || IV) in a scratch
  	       * space in front of the IP header.
  	       */
  	      scratch = payload - esp_sz;
  	      esp0 = (esp_header_t *) (scratch);
  
  	      scratch -= (sizeof (*aad) + pd->hdr_sz);
  	      op->aad = scratch;
  
  	      esp_aad_fill (op, esp0, sa0);
  
  	      /*
  	       * we don't need to refer to the ESP header anymore so we
  	       * can overwrite it with the salt and use the IV where it is
  	       * to form the nonce = (Salt + IV)
  	       */
  	      op->iv -= sizeof (sa0->salt);
  	      clib_memcpy_fast (op->iv, &sa0->salt, sizeof (sa0->salt));
  
  	      op->tag = payload + len;
  	      op->tag_len = 16;
  	    }
  	  op->src = op->dst = payload += cpd.iv_sz;
  	  op->len = len - cpd.iv_sz;
  	  op->user_data = b - bufs;
  	}
  
        /* next */
      next:
        n_left -= 1;
        next += 1;
        pd += 1;
        b += 1;
      }
  
    vlib_increment_combined_counter (&ipsec_sa_counters, thread_index,
  				   current_sa_index, current_sa_pkts,
  				   current_sa_bytes);
  
    if ((n = vec_len (ptd->integ_ops)))
      {
        vnet_crypto_op_t *op = ptd->integ_ops;
        n -= vnet_crypto_process_ops (vm, op, n);
        while (n)
  	{
  	  ASSERT (op - ptd->integ_ops < vec_len (ptd->integ_ops));
  	  if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED)
  	    {
  	      u32 err, bi = op->user_data;
  	      if (op->status == VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC)
  		err = ESP_DECRYPT_ERROR_INTEG_ERROR;
  	      else
  		err = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR;
  	      bufs[bi]->error = node->errors[err];
  	      nexts[bi] = ESP_DECRYPT_NEXT_DROP;
  	      n--;
  	    }
  	  op++;
  	}
      }
    if ((n = vec_len (ptd->crypto_ops)))
      {
        vnet_crypto_op_t *op = ptd->crypto_ops;
        n -= vnet_crypto_process_ops (vm, op, n);
        while (n)
  	{
  	  ASSERT (op - ptd->crypto_ops < vec_len (ptd->crypto_ops));
  	  if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED)
  	    {
  	      u32 err, bi;
  
  	      bi = op->user_data;
  
  	      if (op->status == VNET_CRYPTO_OP_STATUS_FAIL_BAD_HMAC)
  		err = ESP_DECRYPT_ERROR_DECRYPTION_FAILED;
  	      else
  		err = ESP_DECRYPT_ERROR_CRYPTO_ENGINE_ERROR;
  
  	      bufs[bi]->error = node->errors[err];
  	      nexts[bi] = ESP_DECRYPT_NEXT_DROP;
  	      n--;
  	    }
  	  op++;
  	}
      }
  
    /* Post decryption ronud - adjust packet data start and length and next
       node */
  
    n_left = from_frame->n_vectors;
    next = nexts;
    pd = pkt_data;
    b = bufs;
  
    while (n_left)
      {
        const u8 tun_flags = IPSEC_SA_FLAG_IS_TUNNEL |
  	IPSEC_SA_FLAG_IS_TUNNEL_V6;
  
        if (n_left >= 2)
  	{
  	  void *data = b[1]->data + pd[1].current_data;
  
  	  /* buffer metadata */
  	  vlib_prefetch_buffer_header (b[1], LOAD);
  
  	  /* esp_footer_t */
  	  CLIB_PREFETCH (data + pd[1].current_length - pd[1].icv_sz - 2,
  			 CLIB_CACHE_LINE_BYTES, LOAD);
  
  	  /* packet headers */
  	  CLIB_PREFETCH (data - CLIB_CACHE_LINE_BYTES,
  			 CLIB_CACHE_LINE_BYTES * 2, LOAD);
  	}
  
        if (next[0] < ESP_DECRYPT_N_NEXT)
  	goto trace;
  
        sa0 = vec_elt_at_index (im->sad, pd->sa_index);
  
        /*
         * redo the anti-reply check
         * in this frame say we have sequence numbers, s, s+1, s+1, s+1
         * and s and s+1 are in the window. When we did the anti-replay
         * check above we did so against the state of the window (W),
         * after packet s-1. So each of the packets in the sequence will be
         * accepted.
         * This time s will be cheked against Ws-1, s+1 chceked against Ws
         * (i.e. the window state is updated/advnaced)
         * so this time the successive s+! packet will be dropped.
         * This is a consequence of batching the decrypts. If the
         * check-dcrypt-advance process was done for each packet it would
         * be fine. But we batch the decrypts because it's much more efficient
         * to do so in SW and if we offload to HW and the process is async.
         *
         * You're probably thinking, but this means an attacker can send the
         * above sequence and cause VPP to perform decrpyts that will fail,
         * and that's true. But if the attacker can determine s (a valid
         * sequence number in the window) which is non-trivial, it can generate
         * a sequence s, s+1, s+2, s+3, ... s+n and nothing will prevent any
         * implementation, sequential or batching, from decrypting these.
         */
        if (ipsec_sa_anti_replay_check (sa0, pd->seq))
  	{
  	  b[0]->error = node->errors[ESP_DECRYPT_ERROR_REPLAY];
  	  next[0] = ESP_DECRYPT_NEXT_DROP;
  	  goto trace;
  	}
  
        ipsec_sa_anti_replay_advance (sa0, pd->seq);
  
        esp_footer_t *f = (esp_footer_t *) (b[0]->data + pd->current_data +
  					  pd->current_length - sizeof (*f) -
  					  pd->icv_sz);
        u16 adv = pd->iv_sz + esp_sz;
        u16 tail = sizeof (esp_footer_t) + f->pad_length + pd->icv_sz;
  
        if ((pd->flags & tun_flags) == 0 && !is_tun)	/* transport mode */
  	{
  	  u8 udp_sz = (is_ip6 == 0 && pd->flags & IPSEC_SA_FLAG_UDP_ENCAP) ?
  	    sizeof (udp_header_t) : 0;
  	  u16 ip_hdr_sz = pd->hdr_sz - udp_sz;
  	  u8 *old_ip = b[0]->data + pd->current_data - ip_hdr_sz - udp_sz;
  	  u8 *ip = old_ip + adv + udp_sz;
  
  	  if (is_ip6 && ip_hdr_sz > 64)
  	    memmove (ip, old_ip, ip_hdr_sz);
  	  else
  	    clib_memcpy_le64 (ip, old_ip, ip_hdr_sz);
  
  	  b[0]->current_data = pd->current_data + adv - ip_hdr_sz;
  	  b[0]->current_length = pd->current_length + ip_hdr_sz - tail - adv;
  
  	  if (is_ip6)
  	    {
  	      ip6_header_t *ip6 = (ip6_header_t *) ip;
  	      u16 len = clib_net_to_host_u16 (ip6->payload_length);
  	      len -= adv + tail;
  	      ip6->payload_length = clib_host_to_net_u16 (len);
  	      ip6->protocol = f->next_header;
  	      next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
  	    }
  	  else
  	    {
  	      ip4_header_t *ip4 = (ip4_header_t *) ip;
  	      ip_csum_t sum = ip4->checksum;
  	      u16 len = clib_net_to_host_u16 (ip4->length);
  	      len = clib_host_to_net_u16 (len - adv - tail - udp_sz);
  	      sum = ip_csum_update (sum, ip4->protocol, f->next_header,
  				    ip4_header_t, protocol);
  	      sum = ip_csum_update (sum, ip4->length, len,
  				    ip4_header_t, length);
  	      ip4->checksum = ip_csum_fold (sum);
  	      ip4->protocol = f->next_header;
  	      ip4->length = len;
  	      next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
  	    }
  	}
        else
  	{
  	  if (PREDICT_TRUE (f->next_header == IP_PROTOCOL_IP_IN_IP))
  	    {
  	      next[0] = ESP_DECRYPT_NEXT_IP4_INPUT;
  	      b[0]->current_data = pd->current_data + adv;
  	      b[0]->current_length = pd->current_length - adv - tail;
  	    }
  	  else if (f->next_header == IP_PROTOCOL_IPV6)
  	    {
  	      next[0] = ESP_DECRYPT_NEXT_IP6_INPUT;
  	      b[0]->current_data = pd->current_data + adv;
  	      b[0]->current_length = pd->current_length - adv - tail;
  	    }
  	  else
  	    {
  	      next[0] = ESP_DECRYPT_NEXT_DROP;
  	      b[0]->error = node->errors[ESP_DECRYPT_ERROR_DECRYPTION_FAILED];
  	      goto trace;
  	    }
  	  if (is_tun)
  	    {
  	      if (ipsec_sa_is_set_IS_PROTECT (sa0))
  		{
  		  /*
  		   * Check that the reveal IP header matches that
  		   * of the tunnel we are protecting
  		   */
  		  const ipsec_tun_protect_t *itp;
  
  		  itp =
  		    ipsec_tun_protect_get (vnet_buffer (b[0])->
  					   ipsec.protect_index);
  		  if (PREDICT_TRUE (f->next_header == IP_PROTOCOL_IP_IN_IP))
  		    {
  		      const ip4_header_t *ip4;
  
  		      ip4 = vlib_buffer_get_current (b[0]);
  
  		      if (!ip46_address_is_equal_v4 (&itp->itp_tun.src,
  						     &ip4->dst_address) ||
  			  !ip46_address_is_equal_v4 (&itp->itp_tun.dst,
  						     &ip4->src_address))
  			{
  			  next[0] = ESP_DECRYPT_NEXT_DROP;
  			  b[0]->error =
  			    node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO];
  			}
  		    }
  		  else if (f->next_header == IP_PROTOCOL_IPV6)
  		    {
  		      const ip6_header_t *ip6;
  
  		      ip6 = vlib_buffer_get_current (b[0]);
  
  		      if (!ip46_address_is_equal_v6 (&itp->itp_tun.src,
  						     &ip6->dst_address) ||
  			  !ip46_address_is_equal_v6 (&itp->itp_tun.dst,
  						     &ip6->src_address))
  			{
  			  next[0] = ESP_DECRYPT_NEXT_DROP;
  			  b[0]->error =
  			    node->errors[ESP_DECRYPT_ERROR_TUN_NO_PROTO];
  			}
  		    }
  		}
  	    }
  	}
  
      trace:
        if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
  	{
  	  esp_decrypt_trace_t *tr;
  	  tr = vlib_add_trace (vm, node, b[0], sizeof (*tr));
  	  sa0 = pool_elt_at_index (im->sad,
  				   vnet_buffer (b[0])->ipsec.sad_index);
  	  tr->crypto_alg = sa0->crypto_alg;
  	  tr->integ_alg = sa0->integ_alg;
  	  tr->seq = pd->seq;
  	  tr->sa_seq = sa0->last_seq;
  	  tr->sa_seq_hi = sa0->seq_hi;
  	}
  
        /* next */
        n_left -= 1;
        next += 1;
        pd += 1;
        b += 1;
      }
  
    n_left = from_frame->n_vectors;
    vlib_node_increment_counter (vm, node->node_index,
  			       ESP_DECRYPT_ERROR_RX_PKTS, n_left);
  
    vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left);
  
    b = bufs;
    return n_left;
  }
  
  VLIB_NODE_FN (esp4_decrypt_node) (vlib_main_t * vm,
  				  vlib_node_runtime_t * node,
  				  vlib_frame_t * from_frame)
  {
    return esp_decrypt_inline (vm, node, from_frame, 0, 0);
  }
  
  VLIB_NODE_FN (esp4_decrypt_tun_node) (vlib_main_t * vm,
  				      vlib_node_runtime_t * node,
  				      vlib_frame_t * from_frame)
  {
    return esp_decrypt_inline (vm, node, from_frame, 0, 1);
  }
  
  VLIB_NODE_FN (esp6_decrypt_node) (vlib_main_t * vm,
  				  vlib_node_runtime_t * node,
  				  vlib_frame_t * from_frame)
  {
    return esp_decrypt_inline (vm, node, from_frame, 1, 0);
  }
  
  VLIB_NODE_FN (esp6_decrypt_tun_node) (vlib_main_t * vm,
  				      vlib_node_runtime_t * node,
  				      vlib_frame_t * from_frame)
  {
    return esp_decrypt_inline (vm, node, from_frame, 1, 1);
  }
  
  /* *INDENT-OFF* */
  VLIB_REGISTER_NODE (esp4_decrypt_node) = {
    .name = "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 _
    },
  };
  
  VLIB_REGISTER_NODE (esp6_decrypt_node) = {
    .name = "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 _
    },
  };
  
  VLIB_REGISTER_NODE (esp4_decrypt_tun_node) = {
    .name = "esp4-decrypt-tun",
    .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,
    .sibling_of = "esp4-decrypt",
  };
  
  VLIB_REGISTER_NODE (esp6_decrypt_tun_node) = {
    .name = "esp6-decrypt-tun",
    .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,
    .sibling_of = "esp6-decrypt",
  };
  /* *INDENT-ON* */
  
  /*
   * fd.io coding-style-patch-verification: ON
   *
   * Local Variables:
   * eval: (c-set-style "gnu")
   * End:
   */
  