ip6_sv_reass.c

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/*
 * 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 Shallow Virtual Reassembly.
 *
 * This file contains the source code for IPv6 Shallow Virtual reassembly.
 */

#include <vppinfra/vec.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip6_to_ip4.h>
#include <vppinfra/bihash_48_8.h>
#include <vnet/ip/reass/ip6_sv_reass.h>

#define MSEC_PER_SEC 1000
#define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
#define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000      // 10 seconds default
#define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
#define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
#define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)

typedef enum
{
  IP6_SV_REASS_RC_OK,
  IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
  IP6_SV_REASS_RC_INTERNAL_ERROR,
  IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
} ip6_sv_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_sv_reass_key_t;

typedef union
{
  struct
  {
    u32 reass_index;
    u32 thread_index;
  };
  u64 as_u64;
} ip6_sv_reass_val_t;

typedef union
{
  struct
  {
    ip6_sv_reass_key_t k;
    ip6_sv_reass_val_t v;
  };
  clib_bihash_kv_48_8_t kv;
} ip6_sv_reass_kv_t;

typedef struct
{
  // hash table key
  ip6_sv_reass_key_t key;
  // time when last packet was received
  f64 last_heard;
  // internal id of this reassembly
  u64 id;
  // trace operation counter
  u32 trace_op_counter;
  // buffer indexes of buffers in this reassembly in chronological order -
  // including overlaps and duplicate fragments
  u32 *cached_buffers;
  // set to true when this reassembly is completed
  bool is_complete;
  // ip protocol
  u8 ip_proto;
  u8 icmp_type_or_tcp_flags;
  u32 tcp_ack_number;
  u32 tcp_seq_number;
  // l4 src port
  u16 l4_src_port;
  // l4 dst port
  u16 l4_dst_port;
  // lru indexes
  u32 lru_prev;
  u32 lru_next;
} ip6_sv_reass_t;

typedef struct
{
  ip6_sv_reass_t *pool;
  u32 reass_n;
  u32 id_counter;
  clib_spinlock_t lock;
  // lru indexes
  u32 lru_first;
  u32 lru_last;
} ip6_sv_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_sv_reass_per_thread_t *per_thread_data;

  // convenience
  vlib_main_t *vlib_main;
  vnet_main_t *vnet_main;

  // node index of ip6-drop node
  u32 ip6_drop_idx;
  u32 ip6_icmp_error_idx;
  u32 ip6_sv_reass_expire_node_idx;

  /** Worker handoff */
  u32 fq_index;
  u32 fq_feature_index;

  // reference count for enabling/disabling feature - per interface
  u32 *feature_use_refcount_per_intf;
} ip6_sv_reass_main_t;

extern ip6_sv_reass_main_t ip6_sv_reass_main;

#ifndef CLIB_MARCH_VARIANT
ip6_sv_reass_main_t ip6_sv_reass_main;
#endif /* CLIB_MARCH_VARIANT */

typedef enum
{
  IP6_SV_REASSEMBLY_NEXT_INPUT,
  IP6_SV_REASSEMBLY_NEXT_DROP,
  IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
  IP6_SV_REASSEMBLY_NEXT_HANDOFF,
  IP6_SV_REASSEMBLY_N_NEXT,
} ip6_sv_reass_next_t;

typedef enum
{
  REASS_FRAGMENT_CACHE,
  REASS_FINISH,
  REASS_FRAGMENT_FORWARD,
  REASS_PASSTHROUGH,
} ip6_sv_reass_trace_operation_e;

typedef struct
{
  ip6_sv_reass_trace_operation_e action;
  u32 reass_id;
  u32 op_id;
  u8 ip_proto;
  u16 l4_src_port;
  u16 l4_dst_port;
} ip6_sv_reass_trace_t;

static u8 *
format_ip6_sv_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_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
  if (REASS_PASSTHROUGH != t->action)
    {
      s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
    }
  switch (t->action)
    {
    case REASS_FRAGMENT_CACHE:
      s = format (s, "[cached]");
      break;
    case REASS_FINISH:
      s =
        format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
                t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
                clib_net_to_host_u16 (t->l4_dst_port));
      break;
    case REASS_FRAGMENT_FORWARD:
      s =
        format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
                t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
                clib_net_to_host_u16 (t->l4_dst_port));
      break;
    case REASS_PASSTHROUGH:
      s = format (s, "[not-fragmented]");
      break;
    }
  return s;
}

static void
ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
                        ip6_sv_reass_main_t * rm,
                        ip6_sv_reass_t * reass, u32 bi,
                        ip6_sv_reass_trace_operation_e action,
                        u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
{
  vlib_buffer_t *b = vlib_get_buffer (vm, bi);
  if (pool_is_free_index
      (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
    {
      // this buffer's trace is gone
      b->flags &= ~VLIB_BUFFER_IS_TRACED;
      return;
    }
  ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
  if (reass)
    {
      t->reass_id = reass->id;
      t->op_id = reass->trace_op_counter;
      ++reass->trace_op_counter;
    }
  t->action = action;
  t->ip_proto = ip_proto;
  t->l4_src_port = l4_src_port;
  t->l4_dst_port = l4_dst_port;
#if 0
  static u8 *s = NULL;
  s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
  printf ("%.*s\n", vec_len (s), s);
  fflush (stdout);
  vec_reset_length (s);
#endif
}

always_inline void
ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
                   ip6_sv_reass_per_thread_t * rt, ip6_sv_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);
  vlib_buffer_free (vm, reass->cached_buffers,
                    vec_len (reass->cached_buffers));
  vec_free (reass->cached_buffers);
  reass->cached_buffers = NULL;
  if (~0 != reass->lru_prev)
    {
      ip6_sv_reass_t *lru_prev =
        pool_elt_at_index (rt->pool, reass->lru_prev);
      lru_prev->lru_next = reass->lru_next;
    }
  if (~0 != reass->lru_next)
    {
      ip6_sv_reass_t *lru_next =
        pool_elt_at_index (rt->pool, reass->lru_next);
      lru_next->lru_prev = reass->lru_prev;
    }
  if (rt->lru_first == reass - rt->pool)
    {
      rt->lru_first = reass->lru_next;
    }
  if (rt->lru_last == reass - rt->pool)
    {
      rt->lru_last = reass->lru_prev;
    }
  pool_put (rt->pool, reass);
  --rt->reass_n;
}

always_inline void
ip6_sv_reass_init (ip6_sv_reass_t * reass)
{
  reass->cached_buffers = NULL;
  reass->is_complete = false;
}

always_inline ip6_sv_reass_t *
ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
                             ip6_sv_reass_main_t * rm,
                             ip6_sv_reass_per_thread_t * rt,
                             ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
                             u8 * do_handoff)
{
  ip6_sv_reass_t *reass = NULL;
  f64 now = vlib_time_now (vm);

  if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
    {
      if (vm->thread_index != kv->v.thread_index)
        {
          *do_handoff = 1;
          return NULL;
        }
      reass = pool_elt_at_index (rt->pool, kv->v.reass_index);

      if (now > reass->last_heard + rm->timeout)
        {
          ip6_sv_reass_free (vm, rm, rt, reass);
          reass = NULL;
        }
    }

  if (reass)
    {
      reass->last_heard = now;
      return reass;
    }

  if (rt->reass_n >= rm->max_reass_n)
    {
      reass = pool_elt_at_index (rt->pool, rt->lru_first);
      ip6_sv_reass_free (vm, rm, rt, reass);
    }

  pool_get (rt->pool, reass);
  clib_memset (reass, 0, sizeof (*reass));
  reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
  ++rt->id_counter;
  ip6_sv_reass_init (reass);
  ++rt->reass_n;

  reass->lru_prev = reass->lru_next = ~0;

  if (~0 != rt->lru_last)
    {
      ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
      reass->lru_prev = rt->lru_last;
      lru_last->lru_next = rt->lru_last = reass - rt->pool;
    }

  if (~0 == rt->lru_first)
    {
      rt->lru_first = rt->lru_last = reass - rt->pool;
    }

  reass->key.as_u64[0] = kv->kv.key[0];
  reass->key.as_u64[1] = kv->kv.key[1];
  reass->key.as_u64[2] = kv->kv.key[2];
  reass->key.as_u64[3] = kv->kv.key[3];
  reass->key.as_u64[4] = kv->kv.key[4];
  reass->key.as_u64[5] = kv->kv.key[5];
  kv->v.reass_index = (reass - rt->pool);
  kv->v.thread_index = vm->thread_index;
  reass->last_heard = now;

  if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
    {
      ip6_sv_reass_free (vm, rm, rt, reass);
      reass = NULL;
    }

  return reass;
}

always_inline ip6_sv_reass_rc_t
ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
                     ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
                     ip6_sv_reass_t * reass, u32 bi0,
                     ip6_frag_hdr_t * frag_hdr)
{
  vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
  vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
  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_SV_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;
  fvnb->ip.reass.range_first = fragment_first;
  fvnb->ip.reass.range_last = fragment_last;
  fvnb->ip.reass.next_range_bi = ~0;
  if (0 == fragment_first)
    {
      if (!ip6_get_port
          (vm, fb, fip, fb->current_length, &reass->ip_proto,
           &reass->l4_src_port, &reass->l4_dst_port,
           &reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
           &reass->tcp_seq_number))
        return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;

      reass->is_complete = true;
      vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
      if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
        {
          ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
                                  reass->ip_proto, reass->l4_src_port,
                                  reass->l4_dst_port);
        }
    }
  vec_add1 (reass->cached_buffers, bi0);
  if (!reass->is_complete)
    {
      if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
        {
          ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
                                  REASS_FRAGMENT_CACHE, reass->ip_proto,
                                  reass->l4_src_port, reass->l4_dst_port);
        }
      if (vec_len (reass->cached_buffers) > rm->max_reass_len)
        {
          return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
        }
    }
  return IP6_SV_REASS_RC_OK;
}

always_inline bool
ip6_sv_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_sv_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_sv_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_sv_reassembly_inline (vlib_main_t * vm,
                          vlib_node_runtime_t * node,
                          vlib_frame_t * frame, bool is_feature)
{
  u32 *from = vlib_frame_vector_args (frame);
  u32 n_left_from, n_left_to_next, *to_next, next_index;
  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
  ip6_sv_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_SV_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))
            {
              frag_hdr =
                ip6_ext_header_find (vm, b0, ip0,
                                     IP_PROTOCOL_IPV6_FRAGMENTATION,
                                     &prev_hdr);
            }
          if (!frag_hdr)
            {
              // this is a regular packet - no fragmentation
              if (!ip6_get_port
                  (vm, b0, ip0, b0->current_length,
                   &(vnet_buffer (b0)->ip.reass.ip_proto),
                   &(vnet_buffer (b0)->ip.reass.l4_src_port),
                   &(vnet_buffer (b0)->ip.reass.l4_dst_port),
                   &(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
                   &(vnet_buffer (b0)->ip.reass.tcp_ack_number),
                   &(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
                {
                  error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
                  b0->error = node->errors[error0];
                  next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
                  goto packet_enqueue;
                }
              vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
              next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
              if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
                {
                  ip6_sv_reass_add_trace (vm, node, rm, NULL, bi0,
                                          REASS_PASSTHROUGH,
                                          vnet_buffer (b0)->ip.reass.ip_proto,
                                          vnet_buffer (b0)->ip.
                                          reass.l4_src_port,
                                          vnet_buffer (b0)->ip.
                                          reass.l4_dst_port);
                }
              goto packet_enqueue;
            }
          vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
            (u8 *) frag_hdr - (u8 *) ip0;
          if (0 == ip6_frag_hdr_offset (frag_hdr))
            {
              // first fragment - verify upper-layer is present
              if (!ip6_sv_reass_verify_upper_layer_present
                  (node, b0, frag_hdr))
                {
                  next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
                  goto packet_enqueue;
                }
            }
          if (!ip6_sv_reass_verify_fragment_multiple_8
              (vm, node, b0, frag_hdr)
              || !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
                                                          frag_hdr))
            {
              next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
              goto packet_enqueue;
            }

          ip6_sv_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_sv_reass_t *reass =
            ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
                                         &do_handoff);

          if (PREDICT_FALSE (do_handoff))
            {
              next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
              vnet_buffer (b0)->ip.reass.owner_thread_index =
                kv.v.thread_index;
              goto packet_enqueue;
            }

          if (!reass)
            {
              next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
              error0 = IP6_ERROR_REASS_LIMIT_REACHED;
              b0->error = node->errors[error0];
              goto packet_enqueue;
            }

          if (reass->is_complete)
            {
              vnet_buffer (b0)->ip.reass.is_non_first_fragment =
                ! !ip6_frag_hdr_offset (frag_hdr);
              vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
              vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
                reass->icmp_type_or_tcp_flags;
              vnet_buffer (b0)->ip.reass.tcp_ack_number =
                reass->tcp_ack_number;
              vnet_buffer (b0)->ip.reass.tcp_seq_number =
                reass->tcp_seq_number;
              vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
              vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
              next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
              if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
                {
                  ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
                                          REASS_FRAGMENT_FORWARD,
                                          reass->ip_proto,
                                          reass->l4_src_port,
                                          reass->l4_dst_port);
                }
              goto packet_enqueue;
            }

          switch (ip6_sv_reass_update
                  (vm, node, rm, rt, reass, bi0, frag_hdr))
            {
            case IP6_SV_REASS_RC_OK:
              /* nothing to do here */
              break;
            case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
              vlib_node_increment_counter (vm, node->node_index,
                                           IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
                                           1);
              ip6_sv_reass_free (vm, rm, rt, reass);
              goto next_packet;
              break;
            case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
              vlib_node_increment_counter (vm, node->node_index,
                                           IP6_ERROR_REASS_UNSUPP_IP_PROTO,
                                           1);
              ip6_sv_reass_free (vm, rm, rt, reass);
              goto next_packet;
              break;
            case IP6_SV_REASS_RC_INTERNAL_ERROR:
              vlib_node_increment_counter (vm, node->node_index,
                                           IP6_ERROR_REASS_INTERNAL_ERROR, 1);
              ip6_sv_reass_free (vm, rm, rt, reass);
              goto next_packet;
              break;
            }

          if (reass->is_complete)
            {
              u32 idx;
              vec_foreach_index (idx, reass->cached_buffers)
              {
                u32 bi0 = vec_elt (reass->cached_buffers, idx);
                if (0 == n_left_to_next)
                  {
                    vlib_put_next_frame (vm, node, next_index,
                                         n_left_to_next);
                    vlib_get_next_frame (vm, node, next_index, to_next,
                                         n_left_to_next);
                  }
                to_next[0] = bi0;
                to_next += 1;
                n_left_to_next -= 1;
                b0 = vlib_get_buffer (vm, bi0);
                if (is_feature)
                  {
                    vnet_feature_next (&next0, b0);
                  }
                frag_hdr =
                  vlib_buffer_get_current (b0) +
                  vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
                vnet_buffer (b0)->ip.reass.is_non_first_fragment =
                  ! !ip6_frag_hdr_offset (frag_hdr);
                vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
                vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
                  reass->icmp_type_or_tcp_flags;
                vnet_buffer (b0)->ip.reass.tcp_ack_number =
                  reass->tcp_ack_number;
                vnet_buffer (b0)->ip.reass.tcp_seq_number =
                  reass->tcp_seq_number;
                vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
                vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
                if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
                  {
                    ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
                                            REASS_FRAGMENT_FORWARD,
                                            reass->ip_proto,
                                            reass->l4_src_port,
                                            reass->l4_dst_port);
                  }
                vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
                                                 to_next, n_left_to_next, bi0,
                                                 next0);
              }
              _vec_len (reass->cached_buffers) = 0;     // buffers are owned by frame now
            }
          goto next_packet;

        packet_enqueue:
          to_next[0] = bi0;
          to_next += 1;
          n_left_to_next -= 1;
          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_SV_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_sv_reassembly_error_strings[] = {
#define _(sym, string) string,
  foreach_ip6_error
#undef _
};

VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
                                  vlib_node_runtime_t * node,
                                  vlib_frame_t * frame)
{
  return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
    .name = "ip6-sv-reassembly",
    .vector_size = sizeof (u32),
    .format_trace = format_ip6_sv_reass_trace,
    .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
    .error_strings = ip6_sv_reassembly_error_strings,
    .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
    .next_nodes =
        {
                [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
                [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
                [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
                [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
        },
};
/* *INDENT-ON* */

VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
                                          vlib_node_runtime_t * node,
                                          vlib_frame_t * frame)
{
  return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
    .name = "ip6-sv-reassembly-feature",
    .vector_size = sizeof (u32),
    .format_trace = format_ip6_sv_reass_trace,
    .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
    .error_strings = ip6_sv_reassembly_error_strings,
    .n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
    .next_nodes =
        {
                [IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
                [IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
                [IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
                [IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
        },
};
/* *INDENT-ON* */

/* *INDENT-OFF* */
VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
    .arc_name = "ip6-unicast",
    .node_name = "ip6-sv-reassembly-feature",
    .runs_before = VNET_FEATURES ("ip6-lookup"),
    .runs_after = 0,
};
/* *INDENT-ON* */

#ifndef CLIB_MARCH_VARIANT
static u32
ip6_sv_reass_get_nbuckets ()
{
  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
  u32 nbuckets;
  u8 i;

  nbuckets = (u32) (rm->max_reass_n / IP6_SV_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_sv_reass_event_t;

#ifndef CLIB_MARCH_VARIANT
typedef struct
{
  int failure;
  clib_bihash_48_8_t *new_hash;
} ip6_rehash_cb_ctx;

static int
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;
    }
  return (BIHASH_WALK_CONTINUE);
}

static void
ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
                         u32 max_reassembly_length,
                         u32 expire_walk_interval_ms)
{
  ip6_sv_reass_main.timeout_ms = timeout_ms;
  ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
  ip6_sv_reass_main.max_reass_n = max_reassemblies;
  ip6_sv_reass_main.max_reass_len = max_reassembly_length;
  ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
}

vnet_api_error_t
ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
                  u32 max_reassembly_length, u32 expire_walk_interval_ms)
{
  u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
  ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
                           max_reassembly_length, expire_walk_interval_ms);
  vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
                             ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
                             IP6_EVENT_CONFIG_CHANGED, 0);
  u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
  if (ip6_sv_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-sv-reass", new_nbuckets,
                             new_nbuckets * 1024);
      clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_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_sv_reass_main.hash);
          clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
                            sizeof (ip6_sv_reass_main.hash));
          clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
        }
    }
  return 0;
}

vnet_api_error_t
ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
                  u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
{
  *timeout_ms = ip6_sv_reass_main.timeout_ms;
  *max_reassemblies = ip6_sv_reass_main.max_reass_n;
  *max_reassembly_length = ip6_sv_reass_main.max_reass_len;
  *expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
  return 0;
}

static clib_error_t *
ip6_sv_reass_init_function (vlib_main_t * vm)
{
  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
  clib_error_t *error = 0;
  u32 nbuckets;
  vlib_node_t *node;

  rm->vlib_main = vm;
  rm->vnet_main = vnet_get_main ();

  vec_validate (rm->per_thread_data, vlib_num_workers ());
  ip6_sv_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);
    rt->lru_first = rt->lru_last = ~0;
  }

  node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
  ASSERT (node);
  rm->ip6_sv_reass_expire_node_idx = node->index;

  ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
                           IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
                           IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
                           IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);

  nbuckets = ip6_sv_reass_get_nbuckets ();
  clib_bihash_init_48_8 (&rm->hash, "ip6-sv-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_sv_reass_node.index);

  rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
  rm->fq_feature_index =
    vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);

  rm->feature_use_refcount_per_intf = NULL;

  return error;
}

VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
#endif /* CLIB_MARCH_VARIANT */

static uword
ip6_sv_reass_walk_expired (vlib_main_t * vm,
                           vlib_node_runtime_t * node, vlib_frame_t * f)
{
  ip6_sv_reass_main_t *rm = &ip6_sv_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_sv_reass_t *reass;
      int *pool_indexes_to_free = NULL;

      uword thread_index = 0;
      int index;
      const uword nthreads = vlib_num_workers () + 1;
      for (thread_index = 0; thread_index < nthreads; ++thread_index)
        {
          ip6_sv_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_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
            ip6_sv_reass_free (vm, rm, rt, reass);
          }
          /* *INDENT-ON* */

          clib_spinlock_unlock (&rt->lock);
        }

      vec_free (pool_indexes_to_free);
      if (event_data)
        {
          _vec_len (event_data) = 0;
        }
    }

  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
    .function = ip6_sv_reass_walk_expired,
    .format_trace = format_ip6_sv_reass_trace,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "ip6-sv-reassembly-expire-walk",

    .n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
    .error_strings = ip6_sv_reassembly_error_strings,

};
/* *INDENT-ON* */

static u8 *
format_ip6_sv_reass_key (u8 * s, va_list * args)
{
  ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_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_sv_reass (u8 * s, va_list * args)
{
  vlib_main_t *vm = va_arg (*args, vlib_main_t *);
  ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);

  s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
              reass->id, format_ip6_sv_reass_key, &reass->key,
              reass->trace_op_counter);
  vlib_buffer_t *b;
  u32 *bip;
  u32 counter = 0;
  vec_foreach (bip, reass->cached_buffers)
  {
    u32 bi = *bip;
    do
      {
        b = vlib_get_buffer (vm, bi);
        s = format (s, "  #%03u: bi: %u\n", counter, bi);
        ++counter;
        bi = b->next_buffer;
      }
    while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
  }
  return s;
}

static clib_error_t *
show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
                   CLIB_UNUSED (vlib_cli_command_t * lmd))
{
  ip6_sv_reass_main_t *rm = &ip6_sv_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_sv_reass_t *reass;
  uword thread_index;
  const uword nthreads = vlib_num_workers () + 1;
  for (thread_index = 0; thread_index < nthreads; ++thread_index)
    {
      ip6_sv_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_sv_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 shallow virtual IP6 reassemblies per worker-thread: %lu\n",
                   (long unsigned) rm->max_reass_n);
  vlib_cli_output (vm,
                   "Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
                   (long unsigned) rm->timeout_ms);
  vlib_cli_output (vm,
                   "Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
                   (long unsigned) rm->expire_walk_interval_ms);
  vlib_cli_output (vm, "Buffers in use: %lu\n",
                   (long unsigned) sum_buffers_n);
  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
    .path = "show ip6-sv-reassembly",
    .short_help = "show ip6-sv-reassembly [details]",
    .function = show_ip6_sv_reass,
};
/* *INDENT-ON* */

#ifndef CLIB_MARCH_VARIANT
vnet_api_error_t
ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
{
  return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
                                                  enable_disable);
}
#endif /* CLIB_MARCH_VARIANT */

#define foreach_ip6_sv_reassembly_handoff_error                       \
_(CONGESTION_DROP, "congestion drop")


typedef enum
{
#define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
  foreach_ip6_sv_reassembly_handoff_error
#undef _
    IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
} ip6_sv_reassembly_handoff_error_t;

static char *ip6_sv_reassembly_handoff_error_strings[] = {
#define _(sym,string) string,
  foreach_ip6_sv_reassembly_handoff_error
#undef _
};

typedef struct
{
  u32 next_worker_index;
} ip6_sv_reassembly_handoff_trace_t;

static u8 *
format_ip6_sv_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_sv_reassembly_handoff_trace_t *t =
    va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);

  s =
    format (s, "ip6-sv-reassembly-handoff: next-worker %d",
            t->next_worker_index);

  return s;
}

always_inline uword
ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
                                  vlib_node_runtime_t * node,
                                  vlib_frame_t * frame, bool is_feature)
{
  ip6_sv_reass_main_t *rm = &ip6_sv_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] = 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_sv_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_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
                                 frame->n_vectors - n_enq);
  return frame->n_vectors;
}

VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
                                               vlib_node_runtime_t * node,
                                               vlib_frame_t * frame)
{
  return ip6_sv_reassembly_handoff_inline (vm, node, frame,
                                           false /* is_feature */ );
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
  .name = "ip6-sv-reassembly-handoff",
  .vector_size = sizeof (u32),
  .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
  .error_strings = ip6_sv_reassembly_handoff_error_strings,
  .format_trace = format_ip6_sv_reassembly_handoff_trace,

  .n_next_nodes = 1,

  .next_nodes = {
    [0] = "error-drop",
  },
};


VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
                               vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
}


/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
  .name = "ip6-sv-reass-feature-hoff",
  .vector_size = sizeof (u32),
  .n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
  .error_strings = ip6_sv_reassembly_handoff_error_strings,
  .format_trace = format_ip6_sv_reassembly_handoff_trace,

  .n_next_nodes = 1,

  .next_nodes = {
    [0] = "error-drop",
  },
};
/* *INDENT-ON* */

#ifndef CLIB_MARCH_VARIANT
int
ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
{
  ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
  vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
  if (is_enable)
    {
      if (!rm->feature_use_refcount_per_intf[sw_if_index])
        {
          ++rm->feature_use_refcount_per_intf[sw_if_index];
          return vnet_feature_enable_disable ("ip6-unicast",
                                              "ip6-sv-reassembly-feature",
                                              sw_if_index, 1, 0, 0);
        }
      ++rm->feature_use_refcount_per_intf[sw_if_index];
    }
  else
    {
      --rm->feature_use_refcount_per_intf[sw_if_index];
      if (!rm->feature_use_refcount_per_intf[sw_if_index])
        return vnet_feature_enable_disable ("ip6-unicast",
                                            "ip6-sv-reassembly-feature",
                                            sw_if_index, 0, 0, 0);
    }
  return 0;
}
#endif

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */