add ipsecmb plugin

Change-Id: I99c0737dfeeec2db267773625ddc9b55324fd237
Signed-off-by: Klement Sekera <ksekera@cisco.com>

1 files changed, 651 insertions, 0 deletions

diff --git a/src/plugins/ipsecmb/esp_encrypt.c b/src/plugins/ipsecmb/esp_encrypt.c
new file mode 100644
index 00000000000..312471c6dcd
--- /dev/null
+++ b/src/plugins/ipsecmb/esp_encrypt.c
@@ -0,0 +1,651 @@
+/*
+ * esp_encrypt.c : ipsecmb ESP encrypt 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/udp/udp.h>
+
+#include <vnet/ipsec/ipsec.h>
+#include <vnet/ipsec/esp.h>
+
+#include <ipsecmb/ipsecmb.h>
+
+#define foreach_esp_encrypt_next \
+  _ (DROP, "error-drop")         \
+  _ (IP4_LOOKUP, "ip4-lookup")   \
+  _ (IP6_LOOKUP, "ip6-lookup")   \
+  _ (INTERFACE_OUTPUT, "interface-output")
+
+#define _(v, s) ESP_ENCRYPT_NEXT_##v,
+typedef enum
+{
+  foreach_esp_encrypt_next
+#undef _
+    ESP_ENCRYPT_N_NEXT,
+} esp_encrypt_next_t;
+
+#define foreach_esp_encrypt_error                \
+  _ (RX_PKTS, "ESP pkts received")               \
+  _ (NO_BUFFER, "No buffer (packet dropped)")    \
+  _ (DECRYPTION_FAILED, "ESP encryption failed") \
+  _ (SEQ_CYCLED, "sequence number cycled")
+
+typedef enum
+{
+#define _(sym, str) ESP_ENCRYPT_ERROR_##sym,
+  foreach_esp_encrypt_error
+#undef _
+    ESP_ENCRYPT_N_ERROR,
+} esp_encrypt_error_t;
+
+typedef struct
+{
+  u32 spi;
+  u32 seq;
+  u8 udp_encap;
+  ipsec_crypto_alg_t crypto_alg;
+  ipsec_integ_alg_t integ_alg;
+} esp_encrypt_trace_t;
+
+#ifdef CLIB_MARCH_VARIANT
+static inline void
+add_random_bytes_from_traffic (ipsecmb_main_t * imbm,
+			       u32 thread_index, void *from, u8 size)
+{
+  ASSERT (STRUCT_SIZE_OF (random_bytes_t, data) == size);
+  u32 idx;
+  random_bytes_t *rb;
+  ipsecmb_per_thread_data_t *t = &imbm->per_thread_data[thread_index];;
+  if (PREDICT_TRUE (vec_len (t->rb_recycle_list)))
+    {
+      idx = vec_pop (t->rb_recycle_list);
+      rb = pool_elt_at_index (t->rb_pool, idx);
+    }
+  else
+    {
+      pool_get (t->rb_pool, rb);
+      idx = rb - t->rb_pool;
+    }
+  clib_memcpy (rb->data, from, STRUCT_SIZE_OF (random_bytes_t, data));
+  vec_add1 (t->rb_from_traffic, idx);
+}
+
+static inline int
+random_bytes (ipsecmb_main_t * imbm, u32 thread_index, u8 * where, u8 size)
+{
+  ASSERT (STRUCT_SIZE_OF (random_bytes_t, data) == size);
+  const u8 block_size = STRUCT_SIZE_OF (random_bytes_t, data);
+  ipsecmb_per_thread_data_t *t = &imbm->per_thread_data[thread_index];;
+  if (PREDICT_TRUE (vec_len (t->rb_from_traffic)))
+    {
+      u32 idx = vec_pop (t->rb_from_traffic);
+      random_bytes_t *rb = pool_elt_at_index (t->rb_pool, idx);
+      clib_memcpy (where, rb->data, block_size);
+      vec_add1 (t->rb_recycle_list, idx);
+      return 0;
+    }
+  if (PREDICT_FALSE (0 == vec_len (t->rb_from_dev_urandom)))
+    {
+      ssize_t bytes_read = read (imbm->dev_urandom_fd, t->urandom_buffer,
+				 sizeof (t->urandom_buffer));
+      if (bytes_read < 0)
+	{
+	  clib_unix_warning ("read() from /dev/urandom failed");
+	  return -1;
+	}
+      if (bytes_read < block_size)
+	{
+	  clib_unix_warning
+	    ("read() from /dev/urandom produced only %zd bytes", bytes_read);
+	  return -1;
+	}
+      const ssize_t limit = clib_min (bytes_read, sizeof (t->urandom_buffer));
+      int i;
+      for (i = 0; limit - i >= block_size && vec_len (t->rb_recycle_list) > 0;
+	   i += block_size)
+	{
+	  u32 idx = vec_pop (t->rb_recycle_list);
+	  random_bytes_t *rb = pool_elt_at_index (t->rb_pool, idx);
+	  clib_memcpy (rb->data, t->urandom_buffer + i, block_size);
+	  vec_add1 (t->rb_from_dev_urandom, idx);
+	}
+      for (; limit - i >= block_size; i += block_size)
+	{
+	  random_bytes_t *rb;
+	  pool_get (t->rb_pool, rb);
+	  clib_memcpy (rb->data, t->urandom_buffer + i, block_size);
+	  vec_add1 (t->rb_from_dev_urandom, rb - t->rb_pool);
+	}
+    }
+  u32 idx = vec_pop (t->rb_from_dev_urandom);
+  random_bytes_t *rb = pool_elt_at_index (t->rb_pool, idx);
+  clib_memcpy (where, rb->data, block_size);
+  vec_add1 (t->rb_recycle_list, idx);
+  return 0;
+}
+
+static inline void
+esp_finish_encrypt (vlib_main_t * vm, JOB_AES_HMAC * job,
+		    ipsecmb_main_t * imbm, int thread_index,
+		    u32 * bi0, u32 * next0, ipsec_sa_t ** sa0, int is_ip6)
+{
+  ip4_header_t *oh4 = 0;
+  udp_header_t *udp = 0;
+  ip6_header_t *oh6 = 0;
+  ipsec_main_t *im = &ipsec_main;
+  *bi0 = (uintptr_t) job->user_data;
+  vlib_buffer_t *b0 = vlib_get_buffer (vm, *bi0);
+  u32 sa_index0 = vnet_buffer (b0)->ipsec.sad_index;
+  *sa0 = pool_elt_at_index (im->sad, sa_index0);
+  oh4 = vlib_buffer_get_current (b0);
+  oh6 = vlib_buffer_get_current (b0);
+  if (is_ip6)
+    {
+      oh6->payload_length =
+	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
+			      sizeof (ip6_header_t));
+    }
+  else
+    {
+      oh4->length =
+	clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
+      oh4->checksum = ip4_header_checksum (oh4);
+      if ((*sa0)->udp_encap)
+	{
+	  udp = (udp_header_t *) (oh4 + 1);
+	  udp->length =
+	    clib_host_to_net_u16 (clib_net_to_host_u16 (oh4->length) -
+				  ip4_header_bytes (oh4));
+	}
+    }
+
+  *next0 = (uintptr_t) job->user_data2;
+  const int iv_size = imbm->crypto_algs[(*sa0)->crypto_alg].iv_size;
+  add_random_bytes_from_traffic (imbm, thread_index,
+				 vlib_buffer_get_current (b0) +
+				 b0->current_length - iv_size, iv_size);
+  if (!(*sa0)->is_tunnel)
+    {
+      *next0 = ESP_ENCRYPT_NEXT_INTERFACE_OUTPUT;
+      vlib_buffer_advance (b0, -sizeof (ethernet_header_t));
+    }
+}
+
+always_inline void
+ipsemb_ip4_fill_comon_values (ip4_header_t * oh4, u8 tos)
+{
+  oh4->ip_version_and_header_length = 0x45;
+  oh4->tos = tos;
+  oh4->fragment_id = 0;
+  oh4->flags_and_fragment_offset = 0;
+  oh4->ttl = 254;
+}
+
+always_inline void
+ipsemb_handle_udp_encap (ipsec_sa_t * sa0, esp_header_t ** esp,
+			 ip4_header_t ** oh4)
+{
+  if (sa0->udp_encap)
+    {
+      *esp = (esp_header_t *) ((u8 *) esp + sizeof (udp_header_t));
+      udp_header_t *udp = (udp_header_t *) ((*oh4) + 1);
+      udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
+      udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
+      udp->checksum = 0;
+      (*oh4)->protocol = IP_PROTOCOL_UDP;
+    }
+  else
+    {
+      (*oh4)->protocol = IP_PROTOCOL_IPSEC_ESP;
+    }
+}
+
+always_inline void
+esp_prepare_tunneL_headers (vlib_buffer_t * b0, ipsec_sa_t * sa0, u32 * next0,
+			    u8 * next_hdr_type, ip4_header_t * ih4,
+			    ip4_header_t ** oh4, ip6_header_t * ih6,
+			    ip6_header_t ** oh6, esp_header_t ** esp,
+			    u32 iv_size, int is_ip6)
+{
+  if (is_ip6)
+    {
+      *next0 = ESP_ENCRYPT_NEXT_IP6_LOOKUP;
+      *next_hdr_type = IP_PROTOCOL_IPV6;
+      *oh6 = (ip6_header_t *) ((u8 *) ih6 - sizeof (esp_header_t) -
+			       sizeof (ip6_header_t) - iv_size);
+      (*oh6)->src_address.as_u64[0] = sa0->tunnel_src_addr.ip6.as_u64[0];
+      (*oh6)->src_address.as_u64[1] = sa0->tunnel_src_addr.ip6.as_u64[1];
+      (*oh6)->dst_address.as_u64[0] = sa0->tunnel_dst_addr.ip6.as_u64[0];
+      (*oh6)->dst_address.as_u64[1] = sa0->tunnel_dst_addr.ip6.as_u64[1];
+
+      vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+      vlib_buffer_advance (b0, -(sizeof (esp_header_t) +
+				 sizeof (ip6_header_t) + iv_size));
+      (*oh6)->ip_version_traffic_class_and_flow_label =
+	ih6->ip_version_traffic_class_and_flow_label;
+      (*oh6)->protocol = IP_PROTOCOL_IPSEC_ESP;
+      (*oh6)->hop_limit = 254;
+      *esp = (esp_header_t *) ((*oh6) + 1);
+    }
+  else
+    {				/* is ipv4 */
+      *next0 = ESP_ENCRYPT_NEXT_IP4_LOOKUP;
+      u32 udp_hdr_size = 0;
+      if (sa0->udp_encap)
+	{
+	  udp_hdr_size = sizeof (udp_header_t);
+	}
+      *next_hdr_type = IP_PROTOCOL_IP_IN_IP;
+      (*oh4) =
+	(ip4_header_t *) (((u8 *) ih4) - sizeof (ip4_header_t) -
+			  sizeof (esp_header_t) - udp_hdr_size - iv_size);
+      (*oh4)->src_address.as_u32 = sa0->tunnel_src_addr.ip4.as_u32;
+      (*oh4)->dst_address.as_u32 = sa0->tunnel_dst_addr.ip4.as_u32;
+      vlib_buffer_advance (b0, -(sizeof (ip4_header_t) +
+				 sizeof (esp_header_t) +
+				 udp_hdr_size + iv_size));
+      vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+      *esp = (esp_header_t *) ((*oh4) + 1);
+
+      ipsemb_ip4_fill_comon_values (*oh4, ih4->tos);
+      ipsemb_handle_udp_encap (sa0, esp, oh4);
+    }
+}
+
+always_inline void
+esp_prepare_transport_headers (vlib_buffer_t * b0, ipsec_sa_t * sa0,
+			       u32 * next0, u8 * next_hdr_type,
+			       ip4_header_t * ih4, ip4_header_t ** oh4,
+			       ip6_header_t * ih6, ip6_header_t ** oh6,
+			       esp_header_t ** esp, u32 iv_size, int is_ip6)
+{
+  if (is_ip6)
+    {
+      *next0 = ESP_ENCRYPT_NEXT_IP6_LOOKUP;
+      *next_hdr_type = ih6->protocol;
+      (*oh6) = (ip6_header_t *) ((u8 *) ih6 - sizeof (esp_header_t) -
+				 iv_size);
+      if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
+	{
+	  ethernet_header_t *ieh0, *oeh0;
+	  ieh0 = (ethernet_header_t *) vlib_buffer_get_current (b0) - 1;
+	  oeh0 = (ethernet_header_t *) (*oh6) - 1;
+	  clib_memcpy (oeh0, ieh0, sizeof (ethernet_header_t));
+	}
+      (*oh6)->src_address.as_u64[0] = ih6->src_address.as_u64[0];
+      (*oh6)->src_address.as_u64[1] = ih6->src_address.as_u64[1];
+      (*oh6)->dst_address.as_u64[0] = ih6->dst_address.as_u64[0];
+      (*oh6)->dst_address.as_u64[1] = ih6->dst_address.as_u64[1];
+      vlib_buffer_advance (b0, -(sizeof (esp_header_t) + iv_size));
+      (*oh6)->ip_version_traffic_class_and_flow_label =
+	ih6->ip_version_traffic_class_and_flow_label;
+      (*oh6)->protocol = IP_PROTOCOL_IPSEC_ESP;
+      (*oh6)->hop_limit = 254;
+      *esp = (esp_header_t *) ((*oh6) + 1);
+    }
+  else
+    {				/* is ipv4 */
+      *next0 = ESP_ENCRYPT_NEXT_IP4_LOOKUP;
+      u32 udp_hdr_size = 0;
+      if (sa0->udp_encap)
+	{
+	  udp_hdr_size = sizeof (udp_header_t);
+	}
+      *next_hdr_type = ih4->protocol;
+      (*oh4) = (ip4_header_t *) (((u8 *) ih4) - sizeof (esp_header_t) -
+				 udp_hdr_size - iv_size);
+      if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0)
+	{
+	  ethernet_header_t *ieh0, *oeh0;
+	  ieh0 = (ethernet_header_t *) vlib_buffer_get_current (b0) - 1;
+	  oeh0 = (ethernet_header_t *) (*oh4) - 1;
+	  clib_memcpy (oeh0, ieh0, sizeof (ethernet_header_t));
+	}
+      (*oh4)->src_address.as_u32 = ih4->src_address.as_u32;
+      (*oh4)->dst_address.as_u32 = ih4->dst_address.as_u32;
+      vlib_buffer_advance (b0,
+			   -(sizeof (esp_header_t) + udp_hdr_size + iv_size));
+      *esp = (esp_header_t *) ((*oh4) + 1);
+
+      ipsemb_ip4_fill_comon_values (*oh4, ih4->tos);
+      ipsemb_handle_udp_encap (sa0, esp, oh4);
+    }
+}
+
+static uword
+esp_encrypt_ipsecmb_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;
+  from = vlib_frame_vector_args (from_frame);
+  n_left_from = from_frame->n_vectors;
+  ipsecmb_main_t *imbm = &ipsecmb_main;
+  ipsec_main_t *im = &ipsec_main;
+  u32 packets_in_flight = 0;
+  next_index = node->cached_next_index;
+  u32 thread_index = vlib_get_thread_index ();
+  ipsec_alloc_empty_buffers (vm, im);
+  u32 *to_be_freed = NULL;
+  ipsecmb_per_thread_data_t *t = &imbm->per_thread_data[thread_index];;
+
+  MB_MGR *mgr = imbm->mb_mgr[thread_index];
+
+  while (n_left_from > 0 || packets_in_flight > 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)
+	{
+	  u32 bi0, next0;
+	  vlib_buffer_t *b0 = 0;
+	  u32 sa_index0;
+	  ipsec_sa_t *sa0;
+	  ipsecmb_sa_t *samb0;
+	  ip4_header_t *ih4, *oh4 = 0;
+	  ip6_header_t *ih6, *oh6 = 0;
+	  esp_header_t *esp;
+	  u8 next_hdr_type;
+
+	  bi0 = from[0];
+	  from += 1;
+	  n_left_from -= 1;
+
+	  next0 = ESP_ENCRYPT_NEXT_DROP;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  sa_index0 = vnet_buffer (b0)->ipsec.sad_index;
+	  sa0 = pool_elt_at_index (im->sad, sa_index0);
+	  samb0 = pool_elt_at_index (imbm->sad, sa_index0);
+
+	  if (esp_seq_advance (sa0))
+	    {
+	      clib_warning ("sequence number counter has cycled SPI %u",
+			    sa0->spi);
+	      vlib_node_increment_counter (vm, node->node_index,
+					   ESP_ENCRYPT_ERROR_SEQ_CYCLED, 1);
+	      // TODO: rekey SA
+	      to_next[0] = bi0;
+	      to_next += 1;
+	      goto trace;
+	    }
+
+	  sa0->total_data_size += b0->current_length;
+
+	  if (PREDICT_FALSE (b0->n_add_refs > 0))
+	    {
+	      vec_add1 (to_be_freed, bi0);
+	      b0 = vlib_buffer_copy (vm, b0);
+	      bi0 = vlib_get_buffer_index (vm, b0);
+	    }
+
+	  ih4 = vlib_buffer_get_current (b0);
+	  ih6 = vlib_buffer_get_current (b0);
+
+	  const int iv_size = imbm->crypto_algs[sa0->crypto_alg].iv_size;
+	  if (sa0->is_tunnel)
+	    esp_prepare_tunneL_headers (b0, sa0, &next0, &next_hdr_type, ih4,
+					&oh4, ih6, &oh6, &esp, iv_size,
+					is_ip6);
+	  else
+	    esp_prepare_transport_headers (b0, sa0, &next0, &next_hdr_type,
+					   ih4, &oh4, ih6, &oh6, &esp,
+					   iv_size, is_ip6);
+
+
+	  esp->spi = clib_net_to_host_u32 (sa0->spi);
+	  esp->seq = clib_net_to_host_u32 (sa0->seq);
+	  ASSERT (sa0->crypto_alg < IPSEC_CRYPTO_N_ALG);
+
+	  esp_footer_t *f0;
+	  const u32 payload_offset =
+	    (u8 *) (esp + 1) + iv_size - (u8 *) vlib_buffer_get_current (b0);
+	  JOB_AES_HMAC *job = IPSECMB_FUNC (get_next_job) (mgr);
+	  if (PREDICT_TRUE (sa0->crypto_alg != IPSEC_CRYPTO_ALG_NONE))
+	    {
+	      const int block_size =
+		imbm->crypto_algs[sa0->crypto_alg].block_size;
+	      u32 payload_length = b0->current_length - payload_offset;
+	      int blocks = 1 + (payload_length + 1) / block_size;
+
+	      /* pad packet in input buffer */
+	      u8 pad_bytes =
+		block_size * blocks - sizeof (esp_footer_t) - payload_length;
+	      u8 i;
+	      u8 *padding = vlib_buffer_get_current (b0) + b0->current_length;
+	      b0->current_length = payload_offset + block_size * blocks;
+	      for (i = 0; i < pad_bytes; ++i)
+		{
+		  padding[i] = i + 1;
+		}
+	      f0 = vlib_buffer_get_current (b0) + b0->current_length -
+		sizeof (esp_footer_t);
+	      f0->pad_length = pad_bytes;
+	      f0->next_header = next_hdr_type;
+
+	      random_bytes (imbm, thread_index, (u8 *) (esp + 1), iv_size);
+	      job->iv = (u8 *) (esp + 1);
+	      job->iv_len_in_bytes = iv_size;
+	    }
+
+	  job->chain_order = CIPHER_HASH;
+	  job->cipher_direction = ENCRYPT;
+	  job->src = (u8 *) esp;
+	  job->dst = (u8 *) ((u8 *) (esp + 1) + iv_size);
+	  job->cipher_mode = imbm->crypto_algs[sa0->crypto_alg].cipher_mode;
+	  job->aes_enc_key_expanded = samb0->aes_enc_key_expanded;
+	  job->aes_dec_key_expanded = samb0->aes_dec_key_expanded;
+	  job->aes_key_len_in_bytes = sa0->crypto_key_len;
+	  job->cipher_start_src_offset_in_bytes =
+	    sizeof (esp_header_t) + iv_size;
+	  job->hash_start_src_offset_in_bytes = 0;
+	  job->msg_len_to_cipher_in_bytes =
+	    b0->current_length - payload_offset;
+	  if (PREDICT_TRUE (IPSEC_INTEG_ALG_NONE != sa0->integ_alg))
+	    {
+	      if (sa0->use_esn)
+		{
+		  *(u32 *) (vlib_buffer_get_current (b0) +
+			    b0->current_length) = sa0->seq_hi;
+		  b0->current_length += sizeof (u32);
+		}
+	      job->msg_len_to_hash_in_bytes = b0->current_length -
+		payload_offset + sizeof (esp_header_t) + iv_size;
+	      job->u.HMAC._hashed_auth_key_xor_ipad = samb0->ipad_hash;
+	      job->u.HMAC._hashed_auth_key_xor_opad = samb0->opad_hash;
+	      job->auth_tag_output =
+		vlib_buffer_get_current (b0) + b0->current_length;
+	      job->auth_tag_output_len_in_bytes =
+		imbm->integ_algs[sa0->integ_alg].hash_output_length;
+	      b0->current_length +=
+		imbm->integ_algs[sa0->integ_alg].hash_output_length;
+	    }
+	  job->hash_alg = imbm->integ_algs[sa0->integ_alg].hash_alg;
+	  job->user_data = (void *) (uintptr_t) bi0;
+	  job->user_data2 = (void *) (uintptr_t) next0;
+	  job = IPSECMB_FUNC (submit_job) (mgr);
+	  ++packets_in_flight;
+
+	  if (!job)
+	    {
+	      continue;
+	    }
+
+	  --packets_in_flight;
+	  esp_finish_encrypt (vm, job, imbm, thread_index, &bi0, &next0, &sa0,
+			      is_ip6);
+
+	  to_next[0] = bi0;
+	  to_next += 1;
+	  n_left_to_next -= 1;
+
+	trace:
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      esp_encrypt_trace_t *tr =
+		vlib_add_trace (vm, node, b0, sizeof (*tr));
+	      tr->spi = sa0->spi;
+	      tr->seq = sa0->seq - 1;
+	      tr->udp_encap = sa0->udp_encap;
+	      tr->crypto_alg = sa0->crypto_alg;
+	      tr->integ_alg = sa0->integ_alg;
+	    }
+
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+					   n_left_to_next, bi0, next0);
+	}
+
+      if (PREDICT_FALSE (n_left_from == 0))
+	{
+	  JOB_AES_HMAC *job = NULL;
+	  while (n_left_to_next > 0 && (job = IPSECMB_FUNC (flush_job) (mgr)))
+	    {
+	      --packets_in_flight;
+	      u32 bi0, next0;
+	      vlib_buffer_t *b0;
+	      ipsec_sa_t *sa0;
+
+	      esp_finish_encrypt (vm, job, imbm, thread_index, &bi0, &next0,
+				  &sa0, is_ip6);
+	      b0 = vlib_get_buffer (vm, bi0);
+
+	      to_next[0] = bi0;
+	      to_next += 1;
+	      n_left_to_next -= 1;
+
+	      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+		{
+		  esp_encrypt_trace_t *tr =
+		    vlib_add_trace (vm, node, b0, sizeof (*tr));
+		  tr->spi = sa0->spi;
+		  tr->seq = sa0->seq - 1;
+		  tr->udp_encap = sa0->udp_encap;
+		  tr->crypto_alg = sa0->crypto_alg;
+		  tr->integ_alg = sa0->integ_alg;
+		}
+
+	      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);
+    }
+  vlib_node_increment_counter (vm, node->node_index,
+			       ESP_ENCRYPT_ERROR_RX_PKTS,
+			       from_frame->n_vectors);
+
+  if (to_be_freed)
+    vlib_buffer_free (vm, to_be_freed, vec_len (to_be_freed));
+  vec_free (to_be_freed);
+  if (PREDICT_TRUE (vec_len (t->rb_from_traffic) > 0))
+    {
+      /* recycle traffic generated buffers, because once the packets are sent
+       * out, bytes from these packets are no longer unpredictable */
+      vec_add (t->rb_recycle_list, t->rb_from_traffic,
+	       vec_len (t->rb_from_traffic));
+      _vec_len (t->rb_from_traffic) = 0;
+    }
+  return from_frame->n_vectors;
+}
+
+VLIB_NODE_FN (esp4_encrypt_ipsecmb_node) (vlib_main_t * vm,
+					  vlib_node_runtime_t * node,
+					  vlib_frame_t * from_frame)
+{
+  return esp_encrypt_ipsecmb_inline (vm, node, from_frame, 0 /*is_ip6 */ );
+}
+
+VLIB_NODE_FN (esp6_encrypt_ipsecmb_node) (vlib_main_t * vm,
+					  vlib_node_runtime_t * node,
+					  vlib_frame_t * from_frame)
+{
+  return esp_encrypt_ipsecmb_inline (vm, node, from_frame, 1 /*is_ip6 */ );
+}
+#endif
+
+static char *esp_encrypt_error_strings[] = {
+#define _(sym, string) string,
+  foreach_esp_encrypt_error
+#undef _
+};
+
+/* packet trace format function */
+static u8 *
+format_esp_encrypt_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_encrypt_trace_t *t = va_arg (*args, esp_encrypt_trace_t *);
+
+  s =
+    format (s, "esp: spi %u seq %u crypto %U integrity %U%s", t->spi, t->seq,
+	    format_ipsec_crypto_alg, t->crypto_alg, format_ipsec_integ_alg,
+	    t->integ_alg, t->udp_encap ? " udp-encap-enabled" : "");
+  return s;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (esp4_encrypt_ipsecmb_node) = {
+    .name = "esp4-encrypt-ipsecmb",
+    .vector_size = sizeof (u32),
+    .format_trace = format_esp_encrypt_trace,
+    .type = VLIB_NODE_TYPE_INTERNAL,
+
+    .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
+    .error_strings = esp_encrypt_error_strings,
+
+    .n_next_nodes = ESP_ENCRYPT_N_NEXT,
+    .next_nodes =
+        {
+#define _(s, n) [ESP_ENCRYPT_NEXT_##s] = n,
+            foreach_esp_encrypt_next
+#undef _
+        },
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (esp6_encrypt_ipsecmb_node) = {
+    .name = "esp6-encrypt-ipsecmb",
+    .vector_size = sizeof (u32),
+    .format_trace = format_esp_encrypt_trace,
+    .type = VLIB_NODE_TYPE_INTERNAL,
+
+    .n_errors = ARRAY_LEN (esp_encrypt_error_strings),
+    .error_strings = esp_encrypt_error_strings,
+
+    .n_next_nodes = ESP_ENCRYPT_N_NEXT,
+    .next_nodes =
+        {
+#define _(s, n) [ESP_ENCRYPT_NEXT_##s] = n,
+            foreach_esp_encrypt_next
+#undef _
+        },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */