Rework kube-proxy into LB plugin

Add support of NAT66

Change-Id: Ie6aa79078a3835f989829b9a597c448dfd2f9ea3
Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>

1 files changed, 0 insertions, 839 deletions

diff --git a/src/plugins/kubeproxy/kp_node.c b/src/plugins/kubeproxy/kp_node.c
deleted file mode 100644
index 5cee6971e35..00000000000
--- a/src/plugins/kubeproxy/kp_node.c
+++ /dev/null
@@ -1,839 +0,0 @@
-/*
- * Copyright (c) 2016 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 copy of the License at:
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or anated to in writing, software
- * distributed under the License is distributed on an "POD IS" BPODIS,
- * 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/fib/ip4_fib.h>
-
-#include <kubeproxy/kp.h>
-#include <kubeproxy/kphash.h>
-
-#define foreach_kp_error \
- _(NONE, "no error") \
- _(PROTO_NOT_SUPPORTED, "protocol not supported")
-
-typedef enum {
-#define _(sym,str) KP_ERROR_##sym,
-  foreach_kp_error
-#undef _
-    KP_N_ERROR,
-} kp_error_t;
-
-static char *kp_error_strings[] = {
-#define _(sym,string) string,
-    foreach_kp_error
-#undef _
-};
-
-typedef struct {
-  u32 vip_index;
-  u32 pod_index;
-} kp_trace_t;
-
-typedef struct {
-  u32 vip_index;
-  u32 node_port;
-} kp_nodeport_trace_t;
-
-typedef struct {
-  u32 rx_sw_if_index;
-  u32 next_index;
-} kp_nat_trace_t;
-
-u8 *
-format_kp_trace (u8 * s, va_list * args)
-{
-  kp_main_t *kpm = &kp_main;
-  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
-  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
-  kp_trace_t *t = va_arg (*args, kp_trace_t *);
-  if (pool_is_free_index(kpm->vips, t->vip_index)) {
-      s = format(s, "kp vip[%d]: This VIP was freed since capture\n");
-  } else {
-      s = format(s, "kp vip[%d]: %U\n", t->vip_index, format_kp_vip, &kpm->vips[t->vip_index]);
-  }
-  if (pool_is_free_index(kpm->pods, t->pod_index)) {
-      s = format(s, "  kp pod[%d]: This POD was freed since capture");
-  } else {
-      s = format(s, "  kp pod[%d]: %U", t->pod_index, format_kp_pod, &kpm->pods[t->pod_index]);
-  }
-  return s;
-}
-
-u8 *
-format_kp_nat_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 *);
-  kp_nat_trace_t *t = va_arg (*args, kp_nat_trace_t *);
-
-  s = format(s, "kp nat: rx_sw_if_index = %d, next_index = %d",
-	     t->rx_sw_if_index, t->next_index);
-
-  return s;
-}
-
-kp_hash_t *kp_get_sticky_table(u32 thread_index)
-{
-  kp_main_t *kpm = &kp_main;
-  kp_hash_t *sticky_ht = kpm->per_cpu[thread_index].sticky_ht;
-  //Check if size changed
-  if (PREDICT_FALSE(sticky_ht && (kpm->per_cpu_sticky_buckets != kp_hash_nbuckets(sticky_ht))))
-    {
-      //Dereference everything in there
-      kp_hash_bucket_t *b;
-      u32 i;
-      kp_hash_foreach_entry(sticky_ht, b, i) {
-	vlib_refcount_add(&kpm->pod_refcount, thread_index, b->value[i], -1);
-	vlib_refcount_add(&kpm->pod_refcount, thread_index, 0, 1);
-      }
-
-      kp_hash_free(sticky_ht);
-      sticky_ht = NULL;
-    }
-
-  //Create if necessary
-  if (PREDICT_FALSE(sticky_ht == NULL)) {
-    kpm->per_cpu[thread_index].sticky_ht = kp_hash_alloc(kpm->per_cpu_sticky_buckets, kpm->flow_timeout);
-    sticky_ht = kpm->per_cpu[thread_index].sticky_ht;
-    clib_warning("Regenerated sticky table %p", sticky_ht);
-  }
-
-  ASSERT(sticky_ht);
-
-  //Update timeout
-  sticky_ht->timeout = kpm->flow_timeout;
-  return sticky_ht;
-}
-
-u64
-kp_node_get_other_ports4(ip4_header_t *ip40)
-{
-  return 0;
-}
-
-u64
-kp_node_get_other_ports6(ip6_header_t *ip60)
-{
-  return 0;
-}
-
-static_always_inline u32
-kp_node_get_hash(vlib_buffer_t *p, u8 is_input_v4)
-{
-  u32 hash;
-  if (is_input_v4)
-    {
-      ip4_header_t *ip40;
-      u64 ports;
-      ip40 = vlib_buffer_get_current (p);
-      if (PREDICT_TRUE (ip40->protocol == IP_PROTOCOL_TCP ||
-		       ip40->protocol == IP_PROTOCOL_UDP))
-	ports = ((u64)((udp_header_t *)(ip40 + 1))->src_port << 16) |
-	  ((u64)((udp_header_t *)(ip40 + 1))->dst_port);
-      else
-	ports = kp_node_get_other_ports4(ip40);
-
-      hash = kp_hash_hash(*((u64 *)&ip40->address_pair), ports,
-			  0, 0, 0);
-    }
-  else
-    {
-      ip6_header_t *ip60;
-      ip60 = vlib_buffer_get_current (p);
-      u64 ports;
-      if (PREDICT_TRUE (ip60->protocol == IP_PROTOCOL_TCP ||
-			ip60->protocol == IP_PROTOCOL_UDP))
-	ports = ((u64)((udp_header_t *)(ip60 + 1))->src_port << 16) |
-	((u64)((udp_header_t *)(ip60 + 1))->dst_port);
-      else
-	ports = kp_node_get_other_ports6(ip60);
-
-      hash = kp_hash_hash(ip60->src_address.as_u64[0],
-			  ip60->src_address.as_u64[1],
-			  ip60->dst_address.as_u64[0],
-			  ip60->dst_address.as_u64[1],
-			  ports);
-    }
-  return hash;
-}
-
-static_always_inline uword
-kp_node_fn (vlib_main_t * vm,
-         vlib_node_runtime_t * node, vlib_frame_t * frame,
-         u8 is_input_v4, //Compile-time parameter stating that is input is v4 (or v6)
-         u8 is_nat_v4) //Compile-time parameter stating that is NAT is v4 (or v6)
-{
-  kp_main_t *kpm = &kp_main;
-  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
-  u32 thread_index = vlib_get_thread_index();
-  u32 kp_time = kp_hash_time_now(vm);
-
-  kp_hash_t *sticky_ht = kp_get_sticky_table(thread_index);
-  from = vlib_frame_vector_args (frame);
-  n_left_from = frame->n_vectors;
-  next_index = node->cached_next_index;
-
-  u32 nexthash0 = 0;
-  if (PREDICT_TRUE(n_left_from > 0))
-    nexthash0 = kp_node_get_hash(vlib_get_buffer (vm, from[0]), is_input_v4);
-
-  while (n_left_from > 0)
-  {
-    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 pi0;
-      vlib_buffer_t *p0;
-      kp_vip_t *vip0;
-      u32 podindex0;
-      u32 available_index0;
-      u8 counter = 0;
-      u32 hash0 = nexthash0;
-
-      if (PREDICT_TRUE(n_left_from > 1))
-	{
-	  vlib_buffer_t *p1 = vlib_get_buffer (vm, from[1]);
-	  //Compute next hash and prefetch bucket
-	  nexthash0 = kp_node_get_hash(p1, is_input_v4);
-	  kp_hash_prefetch_bucket(sticky_ht, nexthash0);
-	  //Prefetch for encap, next
-	  CLIB_PREFETCH (vlib_buffer_get_current(p1) - 64, 64, STORE);
-	}
-
-      if (PREDICT_TRUE(n_left_from > 2))
-	{
-	  vlib_buffer_t *p2;
-	  p2 = vlib_get_buffer(vm, from[2]);
-	  /* prefetch packet header and data */
-	  vlib_prefetch_buffer_header(p2, STORE);
-	  CLIB_PREFETCH (vlib_buffer_get_current(p2), 64, STORE);
-	}
-
-      pi0 = to_next[0] = from[0];
-      from += 1;
-      n_left_from -= 1;
-      to_next += 1;
-      n_left_to_next -= 1;
-
-      p0 = vlib_get_buffer (vm, pi0);
-      vip0 = pool_elt_at_index (kpm->vips,
-				vnet_buffer (p0)->ip.adj_index[VLIB_TX]);
-
-      kp_hash_get(sticky_ht, hash0, vnet_buffer (p0)->ip.adj_index[VLIB_TX],
-		  kp_time, &available_index0, &podindex0);
-
-      if (PREDICT_TRUE(podindex0 != ~0))
-	{
-	  //Found an existing entry
-	  counter = KP_VIP_COUNTER_NEXT_PACKET;
-	}
-      else if (PREDICT_TRUE(available_index0 != ~0))
-	{
-	  //There is an available slot for a new flow
-	  podindex0 = vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].pod_index;
-	  counter = KP_VIP_COUNTER_FIRST_PACKET;
-	  counter = (podindex0 == 0)?KP_VIP_COUNTER_NO_SERVER:counter;
-
-	  //Dereference previously used
-	  vlib_refcount_add(&kpm->pod_refcount, thread_index,
-			    kp_hash_available_value(sticky_ht, hash0, available_index0), -1);
-	  vlib_refcount_add(&kpm->pod_refcount, thread_index,
-			    podindex0, 1);
-
-	  //Add sticky entry
-	  //Note that when there is no POD configured, an entry is configured anyway.
-	  //But no configured POD is not something that should happen
-	  kp_hash_put(sticky_ht, hash0, podindex0,
-		      vnet_buffer (p0)->ip.adj_index[VLIB_TX],
-		      available_index0, kp_time);
-	}
-      else
-	{
-	  //Could not store new entry in the table
-	  podindex0 = vip0->new_flow_table[hash0 & vip0->new_flow_table_mask].pod_index;
-	  counter = KP_VIP_COUNTER_UNTRACKED_PACKET;
-	}
-
-      vlib_increment_simple_counter(&kpm->vip_counters[counter],
-				    thread_index,
-				    vnet_buffer (p0)->ip.adj_index[VLIB_TX],
-				    1);
-      //Now let's do NAT
-      {
-	udp_header_t *port0;
-
-	if ( (is_input_v4==1) && (is_nat_v4==1) )  /* NAT44 */
-	  {
-	    ip4_header_t *ip40;
-	    ip40 = vlib_buffer_get_current(p0);
-	    port0 = (udp_header_t *)(ip40 + 1);
-	    ip40->dst_address = kpm->pods[podindex0].address.ip4;
-	    ip40->checksum = ip4_header_checksum (ip40);
-	  }
-	else if ( (is_input_v4==1) && (is_nat_v4==0) )  /* NAT46 */
-	  {
-	    /* TBD */
-	    u16 len0 = 0;
-	    ip4_header_t *ip40;
-	    ip40 = vlib_buffer_get_current(p0);
-	    len0 = clib_net_to_host_u16(ip40->length);
-
-	    vlib_buffer_advance(p0, (-sizeof(ip6_header_t)+sizeof(ip4_header_t)) );
-	    ip6_header_t *ip60;
-	    ip60 = vlib_buffer_get_current(p0);
-	    port0 = (udp_header_t *)(ip60 + 1);
-	    ip60->payload_length = len0 - sizeof(ip4_header_t);
-	    ip60->dst_address = kpm->pods[podindex0].address.ip6;
-	  }
-	else if ( (is_input_v4==0) && (is_nat_v4==0) )  /* NAT66 */
-	  {
-	    ip6_header_t *ip60;
-	    ip60 = vlib_buffer_get_current(p0);
-	    port0 = (udp_header_t *)(ip60 + 1);
-	    ip60->dst_address = kpm->pods[podindex0].address.ip6;
-	  }
-	else /* NAT64 */
-	  {
-	    /* TBD */
-	    u16 len0 = 0;
-	    ip6_header_t *ip60;
-	    ip60 = vlib_buffer_get_current(p0);
-	    len0 = clib_net_to_host_u16(ip60->payload_length);
-
-	    vlib_buffer_advance(p0, (sizeof(ip6_header_t)-sizeof(ip4_header_t)) );
-	    ip4_header_t *ip40;
-	    ip40 = vlib_buffer_get_current(p0);
-	    port0 = (udp_header_t *)(ip40 + 1);
-	    ip40->length = len0 + sizeof(ip4_header_t);
-	    ip40->dst_address = kpm->pods[podindex0].address.ip4;
-	    ip40->checksum = ip4_header_checksum (ip40);
-	  }
-
-	port0->dst_port = vip0->target_port;
-      }
-
-      if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
-	{
-	  kp_trace_t *tr = vlib_add_trace (vm, node, p0, sizeof (*tr));
-	  tr->pod_index = podindex0;
-	  tr->vip_index = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
-	}
-
-      //Enqueue to next
-      //Note that this is going to error if podindex0 == 0
-      vnet_buffer (p0)->ip.adj_index[VLIB_TX] = kpm->pods[podindex0].dpo.dpoi_index;
-      vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
-				       n_left_to_next, pi0,
-				       kpm->pods[podindex0].dpo.dpoi_next_node);
-    }
-    vlib_put_next_frame (vm, node, next_index, n_left_to_next);
-  }
-
-  return frame->n_vectors;
-}
-
-u8 *
-format_nodeport_kp_trace (u8 * s, va_list * args)
-{
-  kp_main_t *kpm = &kp_main;
-  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
-  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
-  kp_nodeport_trace_t *t = va_arg (*args, kp_nodeport_trace_t *);
-  if (pool_is_free_index(kpm->vips, t->vip_index)) {
-      s = format(s, "kp vip[%d]: This VIP was freed since capture\n");
-  } else {
-      s = format(s, "kp vip[%d]: %U\n", t->vip_index, format_kp_vip, &kpm->vips[t->vip_index]);
-  }
-
-  s = format(s, "  kp node_port: %d", t->node_port);
-
-  return s;
-}
-static uword
-kp_nodeport_node_fn (vlib_main_t * vm,
-                     vlib_node_runtime_t * node,
-		     vlib_frame_t * frame,
-		     u8 is_input_v4)
-{
-  kp_main_t *kpm = &kp_main;
-  u32 n_left_from, *from, next_index, *to_next, n_left_to_next;
-
-  from = vlib_frame_vector_args (frame);
-  n_left_from = frame->n_vectors;
-  next_index = node->cached_next_index;
-
-
-  while (n_left_from > 0)
-  {
-    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 pi0;
-      vlib_buffer_t *p0;
-      udp_header_t * udp_0;
-      uword * entry0;
-      u32 next0 = KP_NODEPORT_NEXT_DROP;
-
-
-      if (PREDICT_TRUE(n_left_from > 1))
-	{
-	  vlib_buffer_t *p1 = vlib_get_buffer (vm, from[1]);
-	  //Prefetch for encap, next
-	  CLIB_PREFETCH (vlib_buffer_get_current(p1) - 64, 64, STORE);
-	}
-
-      if (PREDICT_TRUE(n_left_from > 2))
-	{
-	  vlib_buffer_t *p2;
-	  p2 = vlib_get_buffer(vm, from[2]);
-	  /* prefetch packet header and data */
-	  vlib_prefetch_buffer_header(p2, STORE);
-	  CLIB_PREFETCH (vlib_buffer_get_current(p2), 64, STORE);
-	}
-
-      pi0 = to_next[0] = from[0];
-      from += 1;
-      n_left_from -= 1;
-      to_next += 1;
-      n_left_to_next -= 1;
-
-      p0 = vlib_get_buffer (vm, pi0);
-
-      if (is_input_v4==1)
-	{
-	  ip4_header_t *ip40;
-	  vlib_buffer_advance
-	    (p0, -(word)(sizeof(udp_header_t)+sizeof(ip4_header_t)));
-	  ip40 = vlib_buffer_get_current(p0);
-	  udp_0 = (udp_header_t *)(ip40 + 1);
-	}
-      else
-	{
-	  ip6_header_t *ip60;
-	  vlib_buffer_advance
-	    (p0, -(word)(sizeof(udp_header_t)+sizeof(ip6_header_t)));
-	  ip60 = vlib_buffer_get_current(p0);
-	  udp_0 = (udp_header_t *)(ip60 + 1);
-	}
-
-      entry0 = hash_get_mem(kpm->nodeport_by_key, &(udp_0->dst_port));
-
-
-      if (is_input_v4==1)
-	{
-          next0 = KP_NODEPORT_NEXT_IP4_NAT4;
-	}
-      else
-	{
-	  next0 = KP_NODEPORT_NEXT_IP6_NAT6;
-	}
-
-      if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
-	{
-	  kp_nodeport_trace_t *tr = vlib_add_trace (vm, node,
-						    p0, sizeof (*tr));
-	  tr->vip_index = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
-	  tr->node_port = (u32)clib_net_to_host_u16(udp_0->dst_port);
-	}
-
-      //Enqueue to next
-      vnet_buffer(p0)->ip.adj_index[VLIB_TX] = entry0[0];
-      vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
-				       n_left_to_next, pi0, next0);
-    }
-    vlib_put_next_frame (vm, node, next_index, n_left_to_next);
-  }
-
-  return frame->n_vectors;
-
-}
-
-/**
- * @brief Match NAT4 static mapping.
- *
- * @param sm          NAT main.
- * @param match       Address and port to match.
- * @param mapping     External or local address and port of the matched mapping.
- *
- * @returns 0 if match found otherwise 1.
- */
-int kp_nat4_mapping_match (kp_main_t *kpm,
-                           kp_snat4_key_t match,
-			   kp_snat4_key_t * mapping)
-{
-  clib_bihash_kv_8_8_t kv, value;
-  kp_snat_mapping_t *m;
-  kp_snat4_key_t m_key;
-  clib_bihash_8_8_t *mapping_hash = &kpm->mapping_by_pod;
-
-  m_key.addr = match.addr;
-  m_key.port = match.port;
-  m_key.protocol = match.protocol;
-  m_key.fib_index = match.fib_index;
-
-  kv.key = m_key.as_u64;
-
-  if (clib_bihash_search_8_8 (mapping_hash, &kv, &value))
-    {
-      return 1;
-    }
-
-  m = pool_elt_at_index (kpm->snat_mappings, value.value);
-
-  if (m->svr_type == KP_SVR_TYPE_VIP_PORT)
-    {
-      mapping->addr = m->vip.ip4;
-      mapping->port = clib_host_to_net_u16 (m->port);
-      mapping->fib_index = m->fib_index;
-      mapping->protocol = match.protocol;
-    }
-  else if (m->svr_type == KP_SVR_TYPE_NODEIP_PORT)
-    {
-      mapping->addr = m->node_ip.ip4;
-      mapping->port = clib_host_to_net_u16 (m->node_port);
-      mapping->fib_index = m->fib_index;
-      mapping->protocol = match.protocol;
-    }
-
-  return 0;
-}
-
-static uword
-kp_nat4_in2out_node_fn (vlib_main_t * vm,
-                        vlib_node_runtime_t * node,
-                        vlib_frame_t * frame)
-{
-  u32 n_left_from, * from, * to_next;
-  kp_nat4_in2out_next_t next_index;
-  u32 pkts_processed = 0;
-  kp_main_t *kpm = &kp_main;
-  u32 stats_node_index;
-
-  stats_node_index = kp_nat4_in2out_node.index;
-
-  from = vlib_frame_vector_args (frame);
-  n_left_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)
-	{
-          u32 bi0;
-	  vlib_buffer_t * b0;
-          u32 next0;
-          u32 sw_if_index0;
-          ip4_header_t * ip0;
-          ip_csum_t sum0;
-          u32 new_addr0, old_addr0;
-          u16 old_port0, new_port0;
-          udp_header_t * udp0;
-          tcp_header_t * tcp0;
-          kp_snat4_key_t key0, sm0;
-          u32 proto0;
-          u32 rx_fib_index0;
-
-          /* speculatively enqueue b0 to the current next frame */
-	  bi0 = from[0];
-	  to_next[0] = bi0;
-	  from += 1;
-	  to_next += 1;
-	  n_left_from -= 1;
-	  n_left_to_next -= 1;
-
-	  b0 = vlib_get_buffer (vm, bi0);
-          next0 = KP_NAT4_IN2OUT_NEXT_LOOKUP;
-
-          ip0 = vlib_buffer_get_current (b0);
-          udp0 = ip4_next_header (ip0);
-          tcp0 = (tcp_header_t *) udp0;
-
-          sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
-	  rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0);
-
-          proto0 = kp_ip_proto_to_nat_proto (ip0->protocol);
-
-          if (PREDICT_FALSE (proto0 == ~0))
-              goto trace0;
-
-          key0.addr = ip0->src_address;
-          key0.protocol = proto0;
-          key0.port = udp0->src_port;
-          key0.fib_index = rx_fib_index0;
-
-          if (kp_nat4_mapping_match (kpm, key0, &sm0))
-            {
-              next0= KP_NAT4_IN2OUT_NEXT_DROP;
-              goto trace0;
-            }
-
-          new_addr0 = sm0.addr.as_u32;
-          new_port0 = sm0.port;
-          vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
-          old_addr0 = ip0->src_address.as_u32;
-          ip0->src_address.as_u32 = new_addr0;
-
-          sum0 = ip0->checksum;
-          sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
-                                 ip4_header_t,
-                                 src_address /* changed member */);
-          ip0->checksum = ip_csum_fold (sum0);
-
-          if (PREDICT_FALSE(new_port0 != udp0->dst_port))
-            {
-              if (PREDICT_TRUE(proto0 == KP_NAT_PROTOCOL_TCP))
-                {
-                  old_port0 = tcp0->src_port;
-                  tcp0->src_port = new_port0;
-
-                  sum0 = tcp0->checksum;
-                  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
-                                         ip4_header_t,
-                                         dst_address /* changed member */);
-                  sum0 = ip_csum_update (sum0, old_port0, new_port0,
-                                         ip4_header_t /* cheat */,
-                                         length /* changed member */);
-                  tcp0->checksum = ip_csum_fold(sum0);
-                }
-              else
-                {
-                  old_port0 = udp0->src_port;
-                  udp0->src_port = new_port0;
-                  udp0->checksum = 0;
-                }
-            }
-          else
-            {
-              if (PREDICT_TRUE(proto0 == KP_NAT_PROTOCOL_TCP))
-                {
-                  sum0 = tcp0->checksum;
-                  sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
-                                         ip4_header_t,
-                                         dst_address /* changed member */);
-                  tcp0->checksum = ip_csum_fold(sum0);
-                }
-            }
-
-        trace0:
-          if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
-                            && (b0->flags & VLIB_BUFFER_IS_TRACED)))
-            {
-              kp_nat_trace_t *t =
-                 vlib_add_trace (vm, node, b0, sizeof (*t));
-              t->rx_sw_if_index = sw_if_index0;
-              t->next_index = next0;
-            }
-
-          pkts_processed += next0 != KP_NAT4_IN2OUT_NEXT_DROP;
-
-          /* verify speculative enqueue, maybe switch current next frame */
-	  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, stats_node_index,
-                               KP_NAT_IN2OUT_ERROR_IN2OUT_PACKETS,
-                               pkts_processed);
-  return frame->n_vectors;
-}
-
-static uword
-kp6_nat6_node_fn (vlib_main_t * vm,
-         vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
-  return kp_node_fn(vm, node, frame, 0, 0);
-}
-
-static uword
-kp6_nat4_node_fn (vlib_main_t * vm,
-         vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
-  return kp_node_fn(vm, node, frame, 0, 1);
-}
-
-static uword
-kp4_nat6_node_fn (vlib_main_t * vm,
-         vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
-  return kp_node_fn(vm, node, frame, 1, 0);
-}
-
-static uword
-kp4_nat4_node_fn (vlib_main_t * vm,
-         vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
-  return kp_node_fn(vm, node, frame, 1, 1);
-}
-
-VLIB_REGISTER_NODE (kp6_nat6_node) =
-{
-  .function = kp6_nat6_node_fn,
-  .name = "kp6-nat6",
-  .vector_size = sizeof (u32),
-  .format_trace = format_kp_trace,
-
-  .n_errors = KP_N_ERROR,
-  .error_strings = kp_error_strings,
-
-  .n_next_nodes = KP_N_NEXT,
-  .next_nodes =
-  {
-      [KP_NEXT_DROP] = "error-drop"
-  },
-};
-
-VLIB_REGISTER_NODE (kp6_nat4_node) =
-{
-  .function = kp6_nat4_node_fn,
-  .name = "kp6-nat4",
-  .vector_size = sizeof (u32),
-  .format_trace = format_kp_trace,
-
-  .n_errors = KP_N_ERROR,
-  .error_strings = kp_error_strings,
-
-  .n_next_nodes = KP_N_NEXT,
-  .next_nodes =
-  {
-      [KP_NEXT_DROP] = "error-drop"
-  },
-};
-
-VLIB_REGISTER_NODE (kp4_nat6_node) =
-{
-  .function = kp4_nat6_node_fn,
-  .name = "kp4-nat6",
-  .vector_size = sizeof (u32),
-  .format_trace = format_kp_trace,
-
-  .n_errors = KP_N_ERROR,
-  .error_strings = kp_error_strings,
-
-  .n_next_nodes = KP_N_NEXT,
-  .next_nodes =
-  {
-      [KP_NEXT_DROP] = "error-drop"
-  },
-};
-
-VLIB_REGISTER_NODE (kp4_nat4_node) =
-{
-  .function = kp4_nat4_node_fn,
-  .name = "kp4-nat4",
-  .vector_size = sizeof (u32),
-  .format_trace = format_kp_trace,
-
-  .n_errors = KP_N_ERROR,
-  .error_strings = kp_error_strings,
-
-  .n_next_nodes = KP_N_NEXT,
-  .next_nodes =
-  {
-      [KP_NEXT_DROP] = "error-drop"
-  },
-};
-
-static uword
-kp4_nodeport_node_fn (vlib_main_t * vm,
-                      vlib_node_runtime_t * node,
-		      vlib_frame_t * frame)
-{
-  return kp_nodeport_node_fn(vm, node, frame, 1);
-}
-
-static uword
-kp6_nodeport_node_fn (vlib_main_t * vm,
-                      vlib_node_runtime_t * node,
-		      vlib_frame_t * frame)
-{
-  return kp_nodeport_node_fn(vm, node, frame, 0);
-}
-
-VLIB_REGISTER_NODE (kp4_nodeport_node) =
-{
-  .function = kp4_nodeport_node_fn,
-  .name = "kp4-nodeport",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nodeport_kp_trace,
-
-  .n_errors = KP_N_ERROR,
-  .error_strings = kp_error_strings,
-
-  .n_next_nodes = KP_NODEPORT_N_NEXT,
-  .next_nodes =
-  {
-      [KP_NODEPORT_NEXT_IP4_NAT4] = "kp4-nat4",
-      [KP_NODEPORT_NEXT_IP4_NAT6] = "kp4-nat6",
-      [KP_NODEPORT_NEXT_IP6_NAT4] = "kp6-nat4",
-      [KP_NODEPORT_NEXT_IP6_NAT6] = "kp6-nat6",
-      [KP_NODEPORT_NEXT_DROP] = "error-drop",
-  },
-};
-
-VLIB_REGISTER_NODE (kp6_nodeport_node) =
-{
-  .function = kp6_nodeport_node_fn,
-  .name = "kp6-nodeport",
-  .vector_size = sizeof (u32),
-  .format_trace = format_nodeport_kp_trace,
-
-  .n_errors = KP_N_ERROR,
-  .error_strings = kp_error_strings,
-
-  .n_next_nodes = KP_NODEPORT_N_NEXT,
-  .next_nodes =
-  {
-      [KP_NODEPORT_NEXT_IP4_NAT4] = "kp4-nat4",
-      [KP_NODEPORT_NEXT_IP4_NAT6] = "kp4-nat6",
-      [KP_NODEPORT_NEXT_IP6_NAT4] = "kp6-nat4",
-      [KP_NODEPORT_NEXT_IP6_NAT6] = "kp6-nat6",
-      [KP_NODEPORT_NEXT_DROP] = "error-drop",
-  },
-};
-
-VNET_FEATURE_INIT (kp_nat4_in2out_node_fn, static) =
-{
-  .arc_name = "ip4-unicast",
-  .node_name = "kp-nat4-in2out",
-  .runs_before = VNET_FEATURES ("ip4-lookup"),
-};
-
-VLIB_REGISTER_NODE (kp_nat4_in2out_node) =
-{
-  .function = kp_nat4_in2out_node_fn,
-  .name = "kp-nat4-in2out",
-  .vector_size = sizeof (u32),
-  .format_trace = format_kp_nat_trace,
-
-  .n_errors = KP_N_ERROR,
-  .error_strings = kp_error_strings,
-
-  .n_next_nodes = KP_NAT4_IN2OUT_N_NEXT,
-  .next_nodes =
-  {
-      [KP_NAT4_IN2OUT_NEXT_DROP] = "error-drop",
-      [KP_NAT4_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
-  },
-};