ip: refactor reassembly

this is a preparation step for introducing other reassembly types

Type: refactor

Change-Id: I197e299dbd729b00eead31667913b8ceff915d63
Signed-off-by: Klement Sekera <ksekera@cisco.com>

1 files changed, 0 insertions, 1795 deletions

diff --git a/src/vnet/ip/ip6_reassembly.c b/src/vnet/ip/ip6_reassembly.c
deleted file mode 100644
index 4f27304ca94..00000000000
--- a/src/vnet/ip/ip6_reassembly.c
+++ /dev/null
@@ -1,1795 +0,0 @@
-/*
- * Copyright (c) 2017 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.
- */
-
-/**
- * @file
- * @brief IPv6 Reassembly.
- *
- * This file contains the source code for IPv6 reassembly.
- */
-
-#include <vppinfra/vec.h>
-#include <vnet/vnet.h>
-#include <vnet/ip/ip.h>
-#include <vppinfra/bihash_48_8.h>
-#include <vnet/ip/ip6_reassembly.h>
-
-#define MSEC_PER_SEC 1000
-#define IP6_REASS_TIMEOUT_DEFAULT_MS 100
-#define IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000	// 10 seconds default
-#define IP6_REASS_MAX_REASSEMBLIES_DEFAULT 1024
-#define IP6_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
-#define IP6_REASS_HT_LOAD_FACTOR (0.75)
-
-typedef enum
-{
-  IP6_REASS_RC_OK,
-  IP6_REASS_RC_INTERNAL_ERROR,
-  IP6_REASS_RC_TOO_MANY_FRAGMENTS,
-  IP6_REASS_RC_NO_BUF,
-  IP6_REASS_RC_HANDOFF,
-} ip6_reass_rc_t;
-
-typedef struct
-{
-  union
-  {
-    struct
-    {
-      ip6_address_t src;
-      ip6_address_t dst;
-      u32 xx_id;
-      u32 frag_id;
-      u8 unused[7];
-      u8 proto;
-    };
-    u64 as_u64[6];
-  };
-} ip6_reass_key_t;
-
-typedef union
-{
-  struct
-  {
-    u32 reass_index;
-    u32 memory_owner_thread_index;
-  };
-  u64 as_u64;
-} ip6_reass_val_t;
-
-typedef union
-{
-  struct
-  {
-    ip6_reass_key_t k;
-    ip6_reass_val_t v;
-  };
-  clib_bihash_kv_48_8_t kv;
-} ip6_reass_kv_t;
-
-
-always_inline u32
-ip6_reass_buffer_get_data_offset (vlib_buffer_t * b)
-{
-  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
-  return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
-}
-
-always_inline u16
-ip6_reass_buffer_get_data_len (vlib_buffer_t * b)
-{
-  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
-  return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
-    (vnb->ip.reass.fragment_first + ip6_reass_buffer_get_data_offset (b)) + 1;
-}
-
-typedef struct
-{
-  // hash table key
-  ip6_reass_key_t key;
-  // time when last packet was received
-  f64 last_heard;
-  // internal id of this reassembly
-  u64 id;
-  // buffer index of first buffer in this reassembly context
-  u32 first_bi;
-  // last octet of packet, ~0 until fragment without more_fragments arrives
-  u32 last_packet_octet;
-  // length of data collected so far
-  u32 data_len;
-  // trace operation counter
-  u32 trace_op_counter;
-  // next index - used by custom apps (~0 if not set)
-  u32 next_index;
-  // error next index - used by custom apps (~0 if not set)
-  u32 error_next_index;
-  // minimum fragment length for this reassembly - used to estimate MTU
-  u16 min_fragment_length;
-  // number of fragments for this reassembly
-  u32 fragments_n;
-  // thread owning memory for this context (whose pool contains this ctx)
-  u32 memory_owner_thread_index;
-  // thread which received fragment with offset 0 and which sends out the
-  // completed reassembly
-  u32 sendout_thread_index;
-} ip6_reass_t;
-
-typedef struct
-{
-  ip6_reass_t *pool;
-  u32 reass_n;
-  u32 id_counter;
-  clib_spinlock_t lock;
-} ip6_reass_per_thread_t;
-
-typedef struct
-{
-  // IPv6 config
-  u32 timeout_ms;
-  f64 timeout;
-  u32 expire_walk_interval_ms;
-  // maximum number of fragments in one reassembly
-  u32 max_reass_len;
-  // maximum number of reassemblies
-  u32 max_reass_n;
-
-  // IPv6 runtime
-  clib_bihash_48_8_t hash;
-
-  // per-thread data
-  ip6_reass_per_thread_t *per_thread_data;
-
-  // convenience
-  vlib_main_t *vlib_main;
-
-  // node index of ip6-drop node
-  u32 ip6_drop_idx;
-  u32 ip6_icmp_error_idx;
-  u32 ip6_reass_expire_node_idx;
-
-  /** Worker handoff */
-  u32 fq_index;
-  u32 fq_feature_index;
-
-} ip6_reass_main_t;
-
-extern ip6_reass_main_t ip6_reass_main;
-
-#ifndef CLIB_MARCH_VARIANT
-ip6_reass_main_t ip6_reass_main;
-#endif /* CLIB_MARCH_VARIANT */
-
-typedef enum
-{
-  IP6_REASSEMBLY_NEXT_INPUT,
-  IP6_REASSEMBLY_NEXT_DROP,
-  IP6_REASSEMBLY_NEXT_ICMP_ERROR,
-  IP6_REASSEMBLY_NEXT_HANDOFF,
-  IP6_REASSEMBLY_N_NEXT,
-} ip6_reass_next_t;
-
-typedef enum
-{
-  RANGE_NEW,
-  RANGE_OVERLAP,
-  ICMP_ERROR_RT_EXCEEDED,
-  ICMP_ERROR_FL_TOO_BIG,
-  ICMP_ERROR_FL_NOT_MULT_8,
-  FINALIZE,
-  HANDOFF,
-} ip6_reass_trace_operation_e;
-
-typedef struct
-{
-  u16 range_first;
-  u16 range_last;
-  u32 range_bi;
-  i32 data_offset;
-  u32 data_len;
-  u32 first_bi;
-} ip6_reass_range_trace_t;
-
-typedef struct
-{
-  ip6_reass_trace_operation_e action;
-  u32 reass_id;
-  ip6_reass_range_trace_t trace_range;
-  u32 op_id;
-  u32 fragment_first;
-  u32 fragment_last;
-  u32 total_data_len;
-  u32 thread_id;
-  u32 thread_id_to;
-} ip6_reass_trace_t;
-
-static void
-ip6_reass_trace_details (vlib_main_t * vm, u32 bi,
-			 ip6_reass_range_trace_t * trace)
-{
-  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
-  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
-  trace->range_first = vnb->ip.reass.range_first;
-  trace->range_last = vnb->ip.reass.range_last;
-  trace->data_offset = ip6_reass_buffer_get_data_offset (b);
-  trace->data_len = ip6_reass_buffer_get_data_len (b);
-  trace->range_bi = bi;
-}
-
-static u8 *
-format_ip6_reass_range_trace (u8 * s, va_list * args)
-{
-  ip6_reass_range_trace_t *trace = va_arg (*args, ip6_reass_range_trace_t *);
-  s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
-	      trace->range_last, trace->data_offset, trace->data_len,
-	      trace->range_bi);
-  return s;
-}
-
-static u8 *
-format_ip6_reass_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 *);
-  ip6_reass_trace_t *t = va_arg (*args, ip6_reass_trace_t *);
-  u32 indent = 0;
-  if (~0 != t->reass_id)
-    {
-      s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
-      indent = format_get_indent (s);
-      s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]",
-		  t->trace_range.first_bi, t->total_data_len,
-		  t->fragment_first, t->fragment_last);
-    }
-  switch (t->action)
-    {
-    case RANGE_NEW:
-      s = format (s, "\n%Unew %U", format_white_space, indent,
-		  format_ip6_reass_range_trace, &t->trace_range);
-      break;
-    case RANGE_OVERLAP:
-      s = format (s, "\n%Uoverlap %U", format_white_space, indent,
-		  format_ip6_reass_range_trace, &t->trace_range);
-      break;
-    case ICMP_ERROR_FL_TOO_BIG:
-      s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
-		  format_white_space, indent, format_ip6_reass_range_trace,
-		  &t->trace_range);
-      break;
-    case ICMP_ERROR_FL_NOT_MULT_8:
-      s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
-		  format_white_space, indent, format_ip6_reass_range_trace,
-		  &t->trace_range);
-      break;
-    case ICMP_ERROR_RT_EXCEEDED:
-      s = format (s, "\n%Uicmp-error - reassembly time exceeded",
-		  format_white_space, indent);
-      break;
-    case FINALIZE:
-      s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
-      break;
-    case HANDOFF:
-      s =
-	format (s, "handoff from thread #%u to thread #%u", t->thread_id,
-		t->thread_id_to);
-      break;
-    }
-  return s;
-}
-
-static void
-ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
-		     ip6_reass_main_t * rm, u32 reass_id, u32 op_id,
-		     u32 bi, u32 first_bi, u32 data_len,
-		     ip6_reass_trace_operation_e action, u32 thread_id_to)
-{
-  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
-  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
-  ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
-  t->reass_id = reass_id;
-  t->action = action;
-  ip6_reass_trace_details (vm, bi, &t->trace_range);
-  t->op_id = op_id;
-  t->thread_id = vm->thread_index;
-  t->thread_id_to = thread_id_to;
-  t->fragment_first = vnb->ip.reass.fragment_first;
-  t->fragment_last = vnb->ip.reass.fragment_last;
-  t->trace_range.first_bi = first_bi;
-  t->total_data_len = data_len;
-#if 0
-  static u8 *s = NULL;
-  s = format (s, "%U", format_ip6_reass_trace, NULL, NULL, t);
-  printf ("%.*s\n", vec_len (s), s);
-  fflush (stdout);
-  vec_reset_length (s);
-#endif
-}
-
-always_inline void
-ip6_reass_free_ctx (ip6_reass_per_thread_t * rt, ip6_reass_t * reass)
-{
-  pool_put (rt->pool, reass);
-  --rt->reass_n;
-}
-
-always_inline void
-ip6_reass_free (ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
-		ip6_reass_t * reass)
-{
-  clib_bihash_kv_48_8_t kv;
-  kv.key[0] = reass->key.as_u64[0];
-  kv.key[1] = reass->key.as_u64[1];
-  kv.key[2] = reass->key.as_u64[2];
-  kv.key[3] = reass->key.as_u64[3];
-  kv.key[4] = reass->key.as_u64[4];
-  kv.key[5] = reass->key.as_u64[5];
-  clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
-  ip6_reass_free_ctx (rt, reass);
-}
-
-always_inline void
-ip6_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
-		    ip6_reass_main_t * rm, ip6_reass_t * reass)
-{
-  u32 range_bi = reass->first_bi;
-  vlib_buffer_t *range_b;
-  vnet_buffer_opaque_t *range_vnb;
-  u32 *to_free = NULL;
-  while (~0 != range_bi)
-    {
-      range_b = vlib_get_buffer (vm, range_bi);
-      range_vnb = vnet_buffer (range_b);
-      u32 bi = range_bi;
-      while (~0 != bi)
-	{
-	  vec_add1 (to_free, bi);
-	  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
-	  if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
-	    {
-	      bi = b->next_buffer;
-	      b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
-	    }
-	  else
-	    {
-	      bi = ~0;
-	    }
-	}
-      range_bi = range_vnb->ip.reass.next_range_bi;
-    }
-  /* send to next_error_index */
-  if (~0 != reass->error_next_index)
-    {
-      u32 n_left_to_next, *to_next, next_index;
-
-      next_index = reass->error_next_index;
-      u32 bi = ~0;
-
-      while (vec_len (to_free) > 0)
-	{
-	  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
-	  while (vec_len (to_free) > 0 && n_left_to_next > 0)
-	    {
-	      bi = vec_pop (to_free);
-
-	      if (~0 != bi)
-		{
-		  to_next[0] = bi;
-		  to_next += 1;
-		  n_left_to_next -= 1;
-		}
-	    }
-	  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
-	}
-    }
-  else
-    {
-      vlib_buffer_free (vm, to_free, vec_len (to_free));
-    }
-  vec_free (to_free);
-}
-
-always_inline void
-ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
-		      ip6_reass_main_t * rm, ip6_reass_t * reass,
-		      u32 * icmp_bi)
-{
-  if (~0 == reass->first_bi)
-    {
-      return;
-    }
-  if (~0 == reass->next_index)	// custom apps don't want icmp
-    {
-      vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
-      if (0 == vnet_buffer (b)->ip.reass.fragment_first)
-	{
-	  *icmp_bi = reass->first_bi;
-	  if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
-	    {
-	      ip6_reass_add_trace (vm, node, rm, reass->id,
-				   reass->trace_op_counter, reass->first_bi,
-				   reass->first_bi, reass->data_len,
-				   ICMP_ERROR_RT_EXCEEDED, ~0);
-	      ++reass->trace_op_counter;
-	    }
-	  // fragment with offset zero received - send icmp message back
-	  if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
-	    {
-	      // separate first buffer from chain and steer it towards icmp node
-	      b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
-	      reass->first_bi = b->next_buffer;
-	    }
-	  else
-	    {
-	      reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
-	    }
-	  icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
-				       ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
-				       0);
-	}
-    }
-  ip6_reass_drop_all (vm, node, rm, reass);
-}
-
-always_inline ip6_reass_t *
-ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
-			  ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
-			  ip6_reass_kv_t * kv, u32 * icmp_bi, u8 * do_handoff)
-{
-  ip6_reass_t *reass;
-  f64 now;
-
-again:
-
-  reass = NULL;
-  now = vlib_time_now (vm);
-
-  if (!clib_bihash_search_48_8
-      (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
-    {
-      reass =
-	pool_elt_at_index (rm->per_thread_data
-			   [kv->v.memory_owner_thread_index].pool,
-			   kv->v.reass_index);
-      if (vm->thread_index != kv->v.memory_owner_thread_index)
-	{
-	  *do_handoff = 1;
-	  return reass;
-	}
-
-      if (now > reass->last_heard + rm->timeout)
-	{
-	  ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi);
-	  ip6_reass_free (rm, rt, reass);
-	  reass = NULL;
-	}
-    }
-
-  if (reass)
-    {
-      reass->last_heard = now;
-      return reass;
-    }
-
-  if (rt->reass_n >= rm->max_reass_n)
-    {
-      reass = NULL;
-      return reass;
-    }
-  else
-    {
-      pool_get (rt->pool, reass);
-      clib_memset (reass, 0, sizeof (*reass));
-      reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
-      ++rt->id_counter;
-      reass->first_bi = ~0;
-      reass->last_packet_octet = ~0;
-      reass->data_len = 0;
-      reass->next_index = ~0;
-      reass->error_next_index = ~0;
-      ++rt->reass_n;
-    }
-
-  reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
-  reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
-  reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
-  reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
-  reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
-  reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
-  kv->v.reass_index = (reass - rt->pool);
-  kv->v.memory_owner_thread_index = vm->thread_index;
-  reass->last_heard = now;
-
-  int rv =
-    clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2);
-  if (rv)
-    {
-      ip6_reass_free_ctx (rt, reass);
-      reass = NULL;
-      // if other worker created a context already work with the other copy
-      if (-2 == rv)
-	goto again;
-    }
-
-  return reass;
-}
-
-always_inline ip6_reass_rc_t
-ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
-		    ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
-		    ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0,
-		    bool is_custom_app)
-{
-  *bi0 = reass->first_bi;
-  *error0 = IP6_ERROR_NONE;
-  ip6_frag_hdr_t *frag_hdr;
-  vlib_buffer_t *last_b = NULL;
-  u32 sub_chain_bi = reass->first_bi;
-  u32 total_length = 0;
-  u32 buf_cnt = 0;
-  u32 dropped_cnt = 0;
-  u32 *vec_drop_compress = NULL;
-  ip6_reass_rc_t rv = IP6_REASS_RC_OK;
-  do
-    {
-      u32 tmp_bi = sub_chain_bi;
-      vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
-      vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
-      if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
-	  !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
-	{
-	  rv = IP6_REASS_RC_INTERNAL_ERROR;
-	  goto free_buffers_and_return;
-	}
-
-      u32 data_len = ip6_reass_buffer_get_data_len (tmp);
-      u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
-	sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp);
-      u32 trim_end =
-	vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
-      if (tmp_bi == reass->first_bi)
-	{
-	  /* first buffer - keep ip6 header */
-	  if (0 != ip6_reass_buffer_get_data_offset (tmp))
-	    {
-	      rv = IP6_REASS_RC_INTERNAL_ERROR;
-	      goto free_buffers_and_return;
-	    }
-	  trim_front = 0;
-	  trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
-	    (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
-	     sizeof (*frag_hdr));
-	  if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
-	    {
-	      rv = IP6_REASS_RC_INTERNAL_ERROR;
-	      goto free_buffers_and_return;
-	    }
-	}
-      u32 keep_data =
-	vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
-      while (1)
-	{
-	  ++buf_cnt;
-	  if (trim_front)
-	    {
-	      if (trim_front > tmp->current_length)
-		{
-		  /* drop whole buffer */
-		  vec_add1 (vec_drop_compress, tmp_bi);
-		  trim_front -= tmp->current_length;
-		  if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
-		    {
-		      rv = IP6_REASS_RC_INTERNAL_ERROR;
-		      goto free_buffers_and_return;
-		    }
-		  tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
-		  tmp_bi = tmp->next_buffer;
-		  tmp = vlib_get_buffer (vm, tmp_bi);
-		  continue;
-		}
-	      else
-		{
-		  vlib_buffer_advance (tmp, trim_front);
-		  trim_front = 0;
-		}
-	    }
-	  if (keep_data)
-	    {
-	      if (last_b)
-		{
-		  last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
-		  last_b->next_buffer = tmp_bi;
-		}
-	      last_b = tmp;
-	      if (keep_data <= tmp->current_length)
-		{
-		  tmp->current_length = keep_data;
-		  keep_data = 0;
-		}
-	      else
-		{
-		  keep_data -= tmp->current_length;
-		  if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
-		    {
-		      rv = IP6_REASS_RC_INTERNAL_ERROR;
-		      goto free_buffers_and_return;
-		    }
-		}
-	      total_length += tmp->current_length;
-	    }
-	  else
-	    {
-	      vec_add1 (vec_drop_compress, tmp_bi);
-	      if (reass->first_bi == tmp_bi)
-		{
-		  rv = IP6_REASS_RC_INTERNAL_ERROR;
-		  goto free_buffers_and_return;
-		}
-	      ++dropped_cnt;
-	    }
-	  if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
-	    {
-	      tmp_bi = tmp->next_buffer;
-	      tmp = vlib_get_buffer (vm, tmp->next_buffer);
-	    }
-	  else
-	    {
-	      break;
-	    }
-	}
-      sub_chain_bi =
-	vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
-	reass.next_range_bi;
-    }
-  while (~0 != sub_chain_bi);
-
-  if (!last_b)
-    {
-      rv = IP6_REASS_RC_INTERNAL_ERROR;
-      goto free_buffers_and_return;
-    }
-  last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
-  vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
-  if (total_length < first_b->current_length)
-    {
-      rv = IP6_REASS_RC_INTERNAL_ERROR;
-      goto free_buffers_and_return;
-    }
-  total_length -= first_b->current_length;
-  first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
-  first_b->total_length_not_including_first_buffer = total_length;
-  // drop fragment header
-  vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
-  ip6_header_t *ip = vlib_buffer_get_current (first_b);
-  u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
-  ip6_ext_header_t *prev_hdr;
-  ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
-			 IP_PROTOCOL_IPV6_FRAGMENTATION);
-  if (prev_hdr)
-    {
-      prev_hdr->next_hdr = frag_hdr->next_hdr;
-    }
-  else
-    {
-      ip->protocol = frag_hdr->next_hdr;
-    }
-  if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
-    {
-      rv = IP6_REASS_RC_INTERNAL_ERROR;
-      goto free_buffers_and_return;
-    }
-  memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
-	   first_b->current_length - ip6_frag_hdr_offset -
-	   sizeof (ip6_frag_hdr_t));
-  first_b->current_length -= sizeof (*frag_hdr);
-  ip->payload_length =
-    clib_host_to_net_u16 (total_length + first_b->current_length -
-			  sizeof (*ip));
-  if (!vlib_buffer_chain_linearize (vm, first_b))
-    {
-      rv = IP6_REASS_RC_NO_BUF;
-      goto free_buffers_and_return;
-    }
-  first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
-  if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
-    {
-      ip6_reass_add_trace (vm, node, rm, reass->id, reass->trace_op_counter,
-			   reass->first_bi, reass->first_bi, reass->data_len,
-			   FINALIZE, ~0);
-      ++reass->trace_op_counter;
-#if 0
-      // following code does a hexdump of packet fragments to stdout ...
-      do
-	{
-	  u32 bi = reass->first_bi;
-	  u8 *s = NULL;
-	  while (~0 != bi)
-	    {
-	      vlib_buffer_t *b = vlib_get_buffer (vm, bi);
-	      s = format (s, "%u: %U\n", bi, format_hexdump,
-			  vlib_buffer_get_current (b), b->current_length);
-	      if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
-		{
-		  bi = b->next_buffer;
-		}
-	      else
-		{
-		  break;
-		}
-	    }
-	  printf ("%.*s\n", vec_len (s), s);
-	  fflush (stdout);
-	  vec_free (s);
-	}
-      while (0);
-#endif
-    }
-  if (!is_custom_app)
-    {
-      *next0 = IP6_REASSEMBLY_NEXT_INPUT;
-    }
-  else
-    {
-      *next0 = reass->next_index;
-    }
-  vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
-  ip6_reass_free (rm, rt, reass);
-  reass = NULL;
-free_buffers_and_return:
-  vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
-  vec_free (vec_drop_compress);
-  return rv;
-}
-
-always_inline void
-ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm,
-				 ip6_reass_per_thread_t * rt,
-				 ip6_reass_t * reass, u32 prev_range_bi,
-				 u32 new_next_bi)
-{
-
-  vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
-  vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
-  if (~0 != prev_range_bi)
-    {
-      vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
-      vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
-      new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
-      prev_vnb->ip.reass.next_range_bi = new_next_bi;
-    }
-  else
-    {
-      if (~0 != reass->first_bi)
-	{
-	  new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
-	}
-      reass->first_bi = new_next_bi;
-    }
-  reass->data_len += ip6_reass_buffer_get_data_len (new_next_b);
-}
-
-always_inline ip6_reass_rc_t
-ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
-		  ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
-		  ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0,
-		  ip6_frag_hdr_t * frag_hdr, bool is_custom_app,
-		  u32 * handoff_thread_idx)
-{
-  int consumed = 0;
-  vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
-  vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
-  if (is_custom_app)
-    {
-      reass->next_index = fvnb->ip.reass.next_index;	// store next_index before it's overwritten
-      reass->error_next_index = fvnb->ip.reass.error_next_index;	// store error_next_index before it is overwritten
-    }
-
-  fvnb->ip.reass.ip6_frag_hdr_offset =
-    (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
-  ip6_header_t *fip = vlib_buffer_get_current (fb);
-  if (fb->current_length < sizeof (*fip) ||
-      fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
-      fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
-    {
-      return IP6_REASS_RC_INTERNAL_ERROR;
-    }
-
-  u32 fragment_first = fvnb->ip.reass.fragment_first =
-    ip6_frag_hdr_offset_bytes (frag_hdr);
-  u32 fragment_length =
-    vlib_buffer_length_in_chain (vm, fb) -
-    (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
-  u32 fragment_last = fvnb->ip.reass.fragment_last =
-    fragment_first + fragment_length - 1;
-  int more_fragments = ip6_frag_hdr_more (frag_hdr);
-  u32 candidate_range_bi = reass->first_bi;
-  u32 prev_range_bi = ~0;
-  fvnb->ip.reass.range_first = fragment_first;
-  fvnb->ip.reass.range_last = fragment_last;
-  fvnb->ip.reass.next_range_bi = ~0;
-  if (!more_fragments)
-    {
-      reass->last_packet_octet = fragment_last;
-    }
-  if (~0 == reass->first_bi)
-    {
-      // starting a new reassembly
-      ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
-				       *bi0);
-      reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
-      consumed = 1;
-      reass->fragments_n = 1;
-      goto check_if_done_maybe;
-    }
-  reass->min_fragment_length =
-    clib_min (clib_net_to_host_u16 (fip->payload_length),
-	      fvnb->ip.reass.estimated_mtu);
-  while (~0 != candidate_range_bi)
-    {
-      vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
-      vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
-      if (fragment_first > candidate_vnb->ip.reass.range_last)
-	{
-	  // this fragments starts after candidate range
-	  prev_range_bi = candidate_range_bi;
-	  candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
-	  if (candidate_vnb->ip.reass.range_last < fragment_last &&
-	      ~0 == candidate_range_bi)
-	    {
-	      // special case - this fragment falls beyond all known ranges
-	      ip6_reass_insert_range_in_chain (vm, rm, rt, reass,
-					       prev_range_bi, *bi0);
-	      consumed = 1;
-	      break;
-	    }
-	  continue;
-	}
-      if (fragment_last < candidate_vnb->ip.reass.range_first)
-	{
-	  // this fragment ends before candidate range without any overlap
-	  ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
-					   *bi0);
-	  consumed = 1;
-	}
-      else if (fragment_first == candidate_vnb->ip.reass.range_first &&
-	       fragment_last == candidate_vnb->ip.reass.range_last)
-	{
-	  // duplicate fragment - ignore
-	}
-      else
-	{
-	  // overlapping fragment - not allowed by RFC 8200
-	  ip6_reass_drop_all (vm, node, rm, reass);
-	  ip6_reass_free (rm, rt, reass);
-	  if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
-	    {
-	      ip6_reass_add_trace (vm, node, rm, reass->id,
-				   reass->trace_op_counter, *bi0,
-				   reass->first_bi, reass->data_len,
-				   RANGE_OVERLAP, ~0);
-	      ++reass->trace_op_counter;
-	    }
-	  *next0 = IP6_REASSEMBLY_NEXT_DROP;
-	  *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
-	  return IP6_REASS_RC_OK;
-	}
-      break;
-    }
-  ++reass->fragments_n;
-check_if_done_maybe:
-  if (consumed)
-    {
-      if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
-	{
-	  ip6_reass_add_trace (vm, node, rm, reass->id,
-			       reass->trace_op_counter, *bi0, reass->first_bi,
-			       reass->data_len, RANGE_NEW, ~0);
-	  ++reass->trace_op_counter;
-	}
-    }
-  if (~0 != reass->last_packet_octet &&
-      reass->data_len == reass->last_packet_octet + 1)
-    {
-      *handoff_thread_idx = reass->sendout_thread_index;
-      ip6_reass_rc_t rc =
-	ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
-			    is_custom_app);
-      if (IP6_REASS_RC_OK == rc
-	  && reass->memory_owner_thread_index != reass->sendout_thread_index)
-	{
-	  return IP6_REASS_RC_HANDOFF;
-	}
-      return rc;
-    }
-  else
-    {
-      if (consumed)
-	{
-	  *bi0 = ~0;
-	  if (reass->fragments_n > rm->max_reass_len)
-	    {
-	      return IP6_REASS_RC_TOO_MANY_FRAGMENTS;
-	    }
-	}
-      else
-	{
-	  *next0 = IP6_REASSEMBLY_NEXT_DROP;
-	  *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
-	}
-    }
-  return IP6_REASS_RC_OK;
-}
-
-always_inline bool
-ip6_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
-				      vlib_buffer_t * b,
-				      ip6_frag_hdr_t * frag_hdr)
-{
-  ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
-  while (ip6_ext_hdr (tmp->next_hdr))
-    {
-      tmp = ip6_ext_next_header (tmp);
-    }
-  if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
-    {
-      icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
-				   ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
-				   0);
-      b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
-
-      return false;
-    }
-  return true;
-}
-
-always_inline bool
-ip6_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
-				      vlib_node_runtime_t * node,
-				      vlib_buffer_t * b,
-				      ip6_frag_hdr_t * frag_hdr)
-{
-  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
-  ip6_header_t *ip = vlib_buffer_get_current (b);
-  int more_fragments = ip6_frag_hdr_more (frag_hdr);
-  u32 fragment_length =
-    vlib_buffer_length_in_chain (vm, b) -
-    (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
-  if (more_fragments && 0 != fragment_length % 8)
-    {
-      icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
-				   ICMP6_parameter_problem_erroneous_header_field,
-				   (u8 *) & ip->payload_length - (u8 *) ip);
-      return false;
-    }
-  return true;
-}
-
-always_inline bool
-ip6_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
-				     vlib_node_runtime_t * node,
-				     vlib_buffer_t * b,
-				     ip6_frag_hdr_t * frag_hdr)
-{
-  vnet_buffer_opaque_t *vnb = vnet_buffer (b);
-  u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
-  u32 fragment_length =
-    vlib_buffer_length_in_chain (vm, b) -
-    (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
-  if (fragment_first + fragment_length > 65535)
-    {
-      ip6_header_t *ip0 = vlib_buffer_get_current (b);
-      icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
-				   ICMP6_parameter_problem_erroneous_header_field,
-				   (u8 *) & frag_hdr->fragment_offset_and_more
-				   - (u8 *) ip0);
-      return false;
-    }
-  return true;
-}
-
-always_inline uword
-ip6_reassembly_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
-		       vlib_frame_t * frame, bool is_feature,
-		       bool is_custom_app)
-{
-  u32 *from = vlib_frame_vector_args (frame);
-  u32 n_left_from, n_left_to_next, *to_next, next_index;
-  ip6_reass_main_t *rm = &ip6_reass_main;
-  ip6_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
-  clib_spinlock_lock (&rt->lock);
-
-  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 bi0;
-	  vlib_buffer_t *b0;
-	  u32 next0 = IP6_REASSEMBLY_NEXT_DROP;
-	  u32 error0 = IP6_ERROR_NONE;
-	  u32 icmp_bi = ~0;
-
-	  bi0 = from[0];
-	  b0 = vlib_get_buffer (vm, bi0);
-
-	  ip6_header_t *ip0 = vlib_buffer_get_current (b0);
-	  ip6_frag_hdr_t *frag_hdr = NULL;
-	  ip6_ext_header_t *prev_hdr;
-	  if (ip6_ext_hdr (ip0->protocol))
-	    {
-	      ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
-				     IP_PROTOCOL_IPV6_FRAGMENTATION);
-	    }
-	  if (!frag_hdr)
-	    {
-	      // this is a regular packet - no fragmentation
-	      next0 = IP6_REASSEMBLY_NEXT_INPUT;
-	      goto skip_reass;
-	    }
-	  if (0 == ip6_frag_hdr_offset (frag_hdr))
-	    {
-	      // first fragment - verify upper-layer is present
-	      if (!ip6_reass_verify_upper_layer_present (node, b0, frag_hdr))
-		{
-		  next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
-		  goto skip_reass;
-		}
-	    }
-	  if (!ip6_reass_verify_fragment_multiple_8 (vm, node, b0, frag_hdr)
-	      || !ip6_reass_verify_packet_size_lt_64k (vm, node, b0,
-						       frag_hdr))
-	    {
-	      next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
-	      goto skip_reass;
-	    }
-	  vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
-	    (u8 *) frag_hdr - (u8 *) ip0;
-
-	  ip6_reass_kv_t kv;
-	  u8 do_handoff = 0;
-
-	  kv.k.as_u64[0] = ip0->src_address.as_u64[0];
-	  kv.k.as_u64[1] = ip0->src_address.as_u64[1];
-	  kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
-	  kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
-	  kv.k.as_u64[4] =
-	    ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
-			    vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
-	    (u64) frag_hdr->identification;
-	  kv.k.as_u64[5] = ip0->protocol;
-
-	  ip6_reass_t *reass =
-	    ip6_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
-				      &do_handoff);
-
-	  if (reass)
-	    {
-	      const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
-	      if (0 == fragment_first)
-		{
-		  reass->sendout_thread_index = vm->thread_index;
-		}
-	    }
-	  if (PREDICT_FALSE (do_handoff))
-	    {
-	      next0 = IP6_REASSEMBLY_NEXT_HANDOFF;
-	      if (is_feature)
-		vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
-		  kv.v.memory_owner_thread_index;
-	      else
-		vnet_buffer (b0)->ip.reass.owner_thread_index =
-		  kv.v.memory_owner_thread_index;
-	    }
-	  else if (reass)
-	    {
-	      u32 handoff_thread_idx;
-	      switch (ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0,
-					&error0, frag_hdr, is_custom_app,
-					&handoff_thread_idx))
-		{
-		case IP6_REASS_RC_OK:
-		  /* nothing to do here */
-		  break;
-		case IP6_REASS_RC_HANDOFF:
-		  next0 = IP6_REASSEMBLY_NEXT_HANDOFF;
-		  b0 = vlib_get_buffer (vm, bi0);
-		  if (is_feature)
-		    vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
-		      handoff_thread_idx;
-		  else
-		    vnet_buffer (b0)->ip.reass.owner_thread_index =
-		      handoff_thread_idx;
-		  break;
-		case IP6_REASS_RC_TOO_MANY_FRAGMENTS:
-		  vlib_node_increment_counter (vm, node->node_index,
-					       IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
-					       1);
-		  ip6_reass_drop_all (vm, node, rm, reass);
-		  ip6_reass_free (rm, rt, reass);
-		  goto next_packet;
-		  break;
-		case IP6_REASS_RC_NO_BUF:
-		  vlib_node_increment_counter (vm, node->node_index,
-					       IP6_ERROR_REASS_NO_BUF, 1);
-		  ip6_reass_drop_all (vm, node, rm, reass);
-		  ip6_reass_free (rm, rt, reass);
-		  goto next_packet;
-		  break;
-		case IP6_REASS_RC_INTERNAL_ERROR:
-		  /* drop everything and start with a clean slate */
-		  vlib_node_increment_counter (vm, node->node_index,
-					       IP6_ERROR_REASS_INTERNAL_ERROR,
-					       1);
-		  ip6_reass_drop_all (vm, node, rm, reass);
-		  ip6_reass_free (rm, rt, reass);
-		  goto next_packet;
-		  break;
-		}
-	    }
-	  else
-	    {
-	      if (is_feature)
-		{
-		  next0 = IP6_REASSEMBLY_NEXT_DROP;
-		}
-	      else
-		{
-		  vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
-		  next0 = fvnb->ip.reass.error_next_index;
-		}
-	      error0 = IP6_ERROR_REASS_LIMIT_REACHED;
-	    }
-
-	  b0->error = node->errors[error0];
-
-	  if (~0 != bi0)
-	    {
-	    skip_reass:
-	      to_next[0] = bi0;
-	      to_next += 1;
-	      n_left_to_next -= 1;
-	      if (next0 == IP6_REASSEMBLY_NEXT_HANDOFF)
-		{
-		  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
-		    {
-		      if (is_feature)
-			ip6_reass_add_trace (vm, node, rm, ~0,
-					     ~0,
-					     bi0, ~0, ~0, HANDOFF,
-					     vnet_buffer (b0)->ip.
-					     reass.owner_feature_thread_index);
-		      else
-			ip6_reass_add_trace (vm, node, rm, ~0, ~0, bi0,
-					     ~0, ~0, HANDOFF,
-					     vnet_buffer (b0)->ip.
-					     reass.owner_thread_index);
-		    }
-		}
-	      else if (is_feature && IP6_ERROR_NONE == error0)
-		{
-		  b0 = vlib_get_buffer (vm, bi0);
-		  vnet_feature_next (&next0, b0);
-		}
-	      vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
-					       n_left_to_next, bi0, next0);
-	    }
-
-	  if (~0 != icmp_bi)
-	    {
-	      next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
-	      to_next[0] = icmp_bi;
-	      to_next += 1;
-	      n_left_to_next -= 1;
-	      vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
-					       n_left_to_next, icmp_bi,
-					       next0);
-	    }
-	next_packet:
-	  from += 1;
-	  n_left_from -= 1;
-	}
-
-      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
-    }
-
-  clib_spinlock_unlock (&rt->lock);
-  return frame->n_vectors;
-}
-
-static char *ip6_reassembly_error_strings[] = {
-#define _(sym, string) string,
-  foreach_ip6_error
-#undef _
-};
-
-VLIB_NODE_FN (ip6_reass_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
-			       vlib_frame_t * frame)
-{
-  return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ ,
-				false /* is_custom_app */ );
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reass_node) = {
-    .name = "ip6-reassembly",
-    .vector_size = sizeof (u32),
-    .format_trace = format_ip6_reass_trace,
-    .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
-    .error_strings = ip6_reassembly_error_strings,
-    .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
-    .next_nodes =
-        {
-                [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
-                [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
-                [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
-                [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reassembly-handoff",
-        },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FN (ip6_reass_node_feature) (vlib_main_t * vm,
-				       vlib_node_runtime_t * node,
-				       vlib_frame_t * frame)
-{
-  return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ ,
-				false /* is_custom_app */ );
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reass_node_feature) = {
-    .name = "ip6-reassembly-feature",
-    .vector_size = sizeof (u32),
-    .format_trace = format_ip6_reass_trace,
-    .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
-    .error_strings = ip6_reassembly_error_strings,
-    .n_next_nodes = IP6_REASSEMBLY_N_NEXT,
-    .next_nodes =
-        {
-                [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
-                [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
-                [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
-                [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reass-feature-hoff",
-        },
-};
-/* *INDENT-ON* */
-
-/* *INDENT-OFF* */
-VNET_FEATURE_INIT (ip6_reassembly_feature, static) = {
-    .arc_name = "ip6-unicast",
-    .node_name = "ip6-reassembly-feature",
-    .runs_before = VNET_FEATURES ("ip6-lookup",
-                                  "ipsec6-input-feature"),
-    .runs_after = 0,
-};
-/* *INDENT-ON* */
-
-#ifndef CLIB_MARCH_VARIANT
-static u32
-ip6_reass_get_nbuckets ()
-{
-  ip6_reass_main_t *rm = &ip6_reass_main;
-  u32 nbuckets;
-  u8 i;
-
-  nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR);
-
-  for (i = 0; i < 31; i++)
-    if ((1 << i) >= nbuckets)
-      break;
-  nbuckets = 1 << i;
-
-  return nbuckets;
-}
-#endif /* CLIB_MARCH_VARIANT */
-
-typedef enum
-{
-  IP6_EVENT_CONFIG_CHANGED = 1,
-} ip6_reass_event_t;
-
-#ifndef CLIB_MARCH_VARIANT
-typedef struct
-{
-  int failure;
-  clib_bihash_48_8_t *new_hash;
-} ip6_rehash_cb_ctx;
-
-static void
-ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
-{
-  ip6_rehash_cb_ctx *ctx = _ctx;
-  if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
-    {
-      ctx->failure = 1;
-    }
-}
-
-static void
-ip6_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
-		      u32 max_reassembly_length, u32 expire_walk_interval_ms)
-{
-  ip6_reass_main.timeout_ms = timeout_ms;
-  ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
-  ip6_reass_main.max_reass_n = max_reassemblies;
-  ip6_reass_main.max_reass_len = max_reassembly_length;
-  ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
-}
-
-vnet_api_error_t
-ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
-	       u32 max_reassembly_length, u32 expire_walk_interval_ms)
-{
-  u32 old_nbuckets = ip6_reass_get_nbuckets ();
-  ip6_reass_set_params (timeout_ms, max_reassemblies, max_reassembly_length,
-			expire_walk_interval_ms);
-  vlib_process_signal_event (ip6_reass_main.vlib_main,
-			     ip6_reass_main.ip6_reass_expire_node_idx,
-			     IP6_EVENT_CONFIG_CHANGED, 0);
-  u32 new_nbuckets = ip6_reass_get_nbuckets ();
-  if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
-    {
-      clib_bihash_48_8_t new_hash;
-      clib_memset (&new_hash, 0, sizeof (new_hash));
-      ip6_rehash_cb_ctx ctx;
-      ctx.failure = 0;
-      ctx.new_hash = &new_hash;
-      clib_bihash_init_48_8 (&new_hash, "ip6-reass", new_nbuckets,
-			     new_nbuckets * 1024);
-      clib_bihash_foreach_key_value_pair_48_8 (&ip6_reass_main.hash,
-					       ip6_rehash_cb, &ctx);
-      if (ctx.failure)
-	{
-	  clib_bihash_free_48_8 (&new_hash);
-	  return -1;
-	}
-      else
-	{
-	  clib_bihash_free_48_8 (&ip6_reass_main.hash);
-	  clib_memcpy_fast (&ip6_reass_main.hash, &new_hash,
-			    sizeof (ip6_reass_main.hash));
-	  clib_bihash_copied (&ip6_reass_main.hash, &new_hash);
-	}
-    }
-  return 0;
-}
-
-vnet_api_error_t
-ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
-	       u32 * expire_walk_interval_ms)
-{
-  *timeout_ms = ip6_reass_main.timeout_ms;
-  *max_reassemblies = ip6_reass_main.max_reass_n;
-  *expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms;
-  return 0;
-}
-
-static clib_error_t *
-ip6_reass_init_function (vlib_main_t * vm)
-{
-  ip6_reass_main_t *rm = &ip6_reass_main;
-  clib_error_t *error = 0;
-  u32 nbuckets;
-  vlib_node_t *node;
-
-  rm->vlib_main = vm;
-
-  vec_validate (rm->per_thread_data, vlib_num_workers ());
-  ip6_reass_per_thread_t *rt;
-  vec_foreach (rt, rm->per_thread_data)
-  {
-    clib_spinlock_init (&rt->lock);
-    pool_alloc (rt->pool, rm->max_reass_n);
-  }
-
-  node = vlib_get_node_by_name (vm, (u8 *) "ip6-reassembly-expire-walk");
-  ASSERT (node);
-  rm->ip6_reass_expire_node_idx = node->index;
-
-  ip6_reass_set_params (IP6_REASS_TIMEOUT_DEFAULT_MS,
-			IP6_REASS_MAX_REASSEMBLIES_DEFAULT,
-			IP6_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
-			IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
-
-  nbuckets = ip6_reass_get_nbuckets ();
-  clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
-
-  node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
-  ASSERT (node);
-  rm->ip6_drop_idx = node->index;
-  node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
-  ASSERT (node);
-  rm->ip6_icmp_error_idx = node->index;
-
-  if ((error = vlib_call_init_function (vm, ip_main_init)))
-    return error;
-  ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
-			 ip6_reass_node.index);
-
-  rm->fq_index = vlib_frame_queue_main_init (ip6_reass_node.index, 0);
-  rm->fq_feature_index =
-    vlib_frame_queue_main_init (ip6_reass_node_feature.index, 0);
-
-  return error;
-}
-
-VLIB_INIT_FUNCTION (ip6_reass_init_function);
-#endif /* CLIB_MARCH_VARIANT */
-
-static uword
-ip6_reass_walk_expired (vlib_main_t * vm,
-			vlib_node_runtime_t * node, vlib_frame_t * f)
-{
-  ip6_reass_main_t *rm = &ip6_reass_main;
-  uword event_type, *event_data = 0;
-
-  while (true)
-    {
-      vlib_process_wait_for_event_or_clock (vm,
-					    (f64) rm->expire_walk_interval_ms
-					    / (f64) MSEC_PER_SEC);
-      event_type = vlib_process_get_events (vm, &event_data);
-
-      switch (event_type)
-	{
-	case ~0:		/* no events => timeout */
-	  /* nothing to do here */
-	  break;
-	case IP6_EVENT_CONFIG_CHANGED:
-	  break;
-	default:
-	  clib_warning ("BUG: event type 0x%wx", event_type);
-	  break;
-	}
-      f64 now = vlib_time_now (vm);
-
-      ip6_reass_t *reass;
-      int *pool_indexes_to_free = NULL;
-
-      uword thread_index = 0;
-      int index;
-      const uword nthreads = vlib_num_workers () + 1;
-      u32 *vec_icmp_bi = NULL;
-      for (thread_index = 0; thread_index < nthreads; ++thread_index)
-	{
-	  ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
-	  clib_spinlock_lock (&rt->lock);
-
-	  vec_reset_length (pool_indexes_to_free);
-          /* *INDENT-OFF* */
-          pool_foreach_index (index, rt->pool, ({
-                                reass = pool_elt_at_index (rt->pool, index);
-                                if (now > reass->last_heard + rm->timeout)
-                                  {
-                                    vec_add1 (pool_indexes_to_free, index);
-                                  }
-                              }));
-          /* *INDENT-ON* */
-	  int *i;
-          /* *INDENT-OFF* */
-          vec_foreach (i, pool_indexes_to_free)
-          {
-            ip6_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
-            u32 icmp_bi = ~0;
-            ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
-            if (~0 != icmp_bi)
-              vec_add1 (vec_icmp_bi, icmp_bi);
-
-            ip6_reass_free (rm, rt, reass);
-          }
-          /* *INDENT-ON* */
-
-	  clib_spinlock_unlock (&rt->lock);
-	}
-
-      while (vec_len (vec_icmp_bi) > 0)
-	{
-	  vlib_frame_t *f =
-	    vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
-	  u32 *to_next = vlib_frame_vector_args (f);
-	  u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
-	  int trace_frame = 0;
-	  while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
-	    {
-	      u32 bi = vec_pop (vec_icmp_bi);
-	      vlib_buffer_t *b = vlib_get_buffer (vm, bi);
-	      if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
-		trace_frame = 1;
-	      b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
-	      to_next[0] = bi;
-	      ++f->n_vectors;
-	      to_next += 1;
-	      n_left_to_next -= 1;
-	    }
-	  f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
-	  vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
-	}
-
-      vec_free (pool_indexes_to_free);
-      vec_free (vec_icmp_bi);
-      if (event_data)
-	{
-	  _vec_len (event_data) = 0;
-	}
-    }
-
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reass_expire_node) = {
-    .function = ip6_reass_walk_expired,
-    .format_trace = format_ip6_reass_trace,
-    .type = VLIB_NODE_TYPE_PROCESS,
-    .name = "ip6-reassembly-expire-walk",
-
-    .n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
-    .error_strings = ip6_reassembly_error_strings,
-
-};
-/* *INDENT-ON* */
-
-static u8 *
-format_ip6_reass_key (u8 * s, va_list * args)
-{
-  ip6_reass_key_t *key = va_arg (*args, ip6_reass_key_t *);
-  s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
-	      key->xx_id, format_ip6_address, &key->src, format_ip6_address,
-	      &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
-  return s;
-}
-
-static u8 *
-format_ip6_reass (u8 * s, va_list * args)
-{
-  vlib_main_t *vm = va_arg (*args, vlib_main_t *);
-  ip6_reass_t *reass = va_arg (*args, ip6_reass_t *);
-
-  s = format (s, "ID: %lu, key: %U\n  first_bi: %u, data_len: %u, "
-	      "last_packet_octet: %u, trace_op_counter: %u\n",
-	      reass->id, format_ip6_reass_key, &reass->key, reass->first_bi,
-	      reass->data_len, reass->last_packet_octet,
-	      reass->trace_op_counter);
-  u32 bi = reass->first_bi;
-  u32 counter = 0;
-  while (~0 != bi)
-    {
-      vlib_buffer_t *b = vlib_get_buffer (vm, bi);
-      vnet_buffer_opaque_t *vnb = vnet_buffer (b);
-      s = format (s, "  #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
-		  "fragment[%u, %u]\n",
-		  counter, vnb->ip.reass.range_first,
-		  vnb->ip.reass.range_last, bi,
-		  ip6_reass_buffer_get_data_offset (b),
-		  ip6_reass_buffer_get_data_len (b),
-		  vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
-      if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
-	{
-	  bi = b->next_buffer;
-	}
-      else
-	{
-	  bi = ~0;
-	}
-    }
-  return s;
-}
-
-static clib_error_t *
-show_ip6_reass (vlib_main_t * vm, unformat_input_t * input,
-		CLIB_UNUSED (vlib_cli_command_t * lmd))
-{
-  ip6_reass_main_t *rm = &ip6_reass_main;
-
-  vlib_cli_output (vm, "---------------------");
-  vlib_cli_output (vm, "IP6 reassembly status");
-  vlib_cli_output (vm, "---------------------");
-  bool details = false;
-  if (unformat (input, "details"))
-    {
-      details = true;
-    }
-
-  u32 sum_reass_n = 0;
-  u64 sum_buffers_n = 0;
-  ip6_reass_t *reass;
-  uword thread_index;
-  const uword nthreads = vlib_num_workers () + 1;
-  for (thread_index = 0; thread_index < nthreads; ++thread_index)
-    {
-      ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
-      clib_spinlock_lock (&rt->lock);
-      if (details)
-	{
-          /* *INDENT-OFF* */
-          pool_foreach (reass, rt->pool, {
-            vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
-          });
-          /* *INDENT-ON* */
-	}
-      sum_reass_n += rt->reass_n;
-      clib_spinlock_unlock (&rt->lock);
-    }
-  vlib_cli_output (vm, "---------------------");
-  vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
-		   (long unsigned) sum_reass_n);
-  vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per "
-		   "worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
-  vlib_cli_output (vm, "Buffers in use: %lu\n",
-		   (long unsigned) sum_buffers_n);
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = {
-    .path = "show ip6-reassembly",
-    .short_help = "show ip6-reassembly [details]",
-    .function = show_ip6_reass,
-};
-/* *INDENT-ON* */
-
-#ifndef CLIB_MARCH_VARIANT
-vnet_api_error_t
-ip6_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
-{
-  return vnet_feature_enable_disable ("ip6-unicast", "ip6-reassembly-feature",
-				      sw_if_index, enable_disable, 0, 0);
-}
-#endif /* CLIB_MARCH_VARIANT */
-
-#define foreach_ip6_reassembly_handoff_error                       \
-_(CONGESTION_DROP, "congestion drop")
-
-
-typedef enum
-{
-#define _(sym,str) IP6_REASSEMBLY_HANDOFF_ERROR_##sym,
-  foreach_ip6_reassembly_handoff_error
-#undef _
-    IP6_REASSEMBLY_HANDOFF_N_ERROR,
-} ip6_reassembly_handoff_error_t;
-
-static char *ip6_reassembly_handoff_error_strings[] = {
-#define _(sym,string) string,
-  foreach_ip6_reassembly_handoff_error
-#undef _
-};
-
-typedef struct
-{
-  u32 next_worker_index;
-} ip6_reassembly_handoff_trace_t;
-
-static u8 *
-format_ip6_reassembly_handoff_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 *);
-  ip6_reassembly_handoff_trace_t *t =
-    va_arg (*args, ip6_reassembly_handoff_trace_t *);
-
-  s =
-    format (s, "ip6-reassembly-handoff: next-worker %d",
-	    t->next_worker_index);
-
-  return s;
-}
-
-always_inline uword
-ip6_reassembly_handoff_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
-			       vlib_frame_t * frame, bool is_feature)
-{
-  ip6_reass_main_t *rm = &ip6_reass_main;
-
-  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
-  u32 n_enq, n_left_from, *from;
-  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
-  u32 fq_index;
-
-  from = vlib_frame_vector_args (frame);
-  n_left_from = frame->n_vectors;
-  vlib_get_buffers (vm, from, bufs, n_left_from);
-
-  b = bufs;
-  ti = thread_indices;
-
-  fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
-
-  while (n_left_from > 0)
-    {
-      ti[0] =
-	(is_feature) ? vnet_buffer (b[0])->ip.
-	reass.owner_feature_thread_index : vnet_buffer (b[0])->ip.
-	reass.owner_thread_index;
-
-      if (PREDICT_FALSE
-	  ((node->flags & VLIB_NODE_FLAG_TRACE)
-	   && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
-	{
-	  ip6_reassembly_handoff_trace_t *t =
-	    vlib_add_trace (vm, node, b[0], sizeof (*t));
-	  t->next_worker_index = ti[0];
-	}
-
-      n_left_from -= 1;
-      ti += 1;
-      b += 1;
-    }
-  n_enq =
-    vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
-				   frame->n_vectors, 1);
-
-  if (n_enq < frame->n_vectors)
-    vlib_node_increment_counter (vm, node->node_index,
-				 IP6_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
-				 frame->n_vectors - n_enq);
-  return frame->n_vectors;
-}
-
-VLIB_NODE_FN (ip6_reassembly_handoff_node) (vlib_main_t * vm,
-					    vlib_node_runtime_t * node,
-					    vlib_frame_t * frame)
-{
-  return ip6_reassembly_handoff_inline (vm, node, frame,
-					false /* is_feature */ );
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reassembly_handoff_node) = {
-  .name = "ip6-reassembly-handoff",
-  .vector_size = sizeof (u32),
-  .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings),
-  .error_strings = ip6_reassembly_handoff_error_strings,
-  .format_trace = format_ip6_reassembly_handoff_trace,
-
-  .n_next_nodes = 1,
-
-  .next_nodes = {
-    [0] = "error-drop",
-  },
-};
-
-
-VLIB_NODE_FN (ip6_reassembly_feature_handoff_node) (vlib_main_t * vm,
-                               vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
-  return ip6_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
-}
-
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reassembly_feature_handoff_node) = {
-  .name = "ip6-reass-feature-hoff",
-  .vector_size = sizeof (u32),
-  .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings),
-  .error_strings = ip6_reassembly_handoff_error_strings,
-  .format_trace = format_ip6_reassembly_handoff_trace,
-
-  .n_next_nodes = 1,
-
-  .next_nodes = {
-    [0] = "error-drop",
-  },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */