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/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
  Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef included_math_h
#define included_math_h

#include <vppinfra/clib.h>

always_inline f64
sqrt (f64 x)
{
  return __builtin_sqrt (x);
}

always_inline f64
fabs (f64 x)
{
  return __builtin_fabs (x);
}

#endif /* included_math_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
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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;
  // 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,
} 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 *);
  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;
    }
  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);
  ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
  t->reass_id = reass->id;
  t->action = action;
  t->op_id = reass->trace_op_counter;
  t->ip_proto = ip_proto;
  t->l4_src_port = l4_src_port;
  t->l4_dst_port = l4_dst_port;
  ++reass->trace_op_counter;
#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 (rm->vlib_main);

  if (!clib_bihash_search_48_8
      (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) 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_last);
      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] = ((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.thread_index = vm->thread_index;
  reass->last_heard = now;

  if (clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) 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)
    {
      ip6_ext_header_t *ext_hdr = (void *) frag_hdr;
      while (ip6_ext_hdr (ext_hdr->next_hdr)
	     && vlib_object_within_buffer_data (vm, fb, ext_hdr,
						ext_hdr->n_data_u64s * 8))
	{
	  ext_hdr = ip6_ext_next_header (ext_hdr);
	}
      reass->ip_proto = ext_hdr->next_hdr;
      reass->l4_src_port = ip6_get_port (fip, 1, fb->current_length);
      reass->l4_dst_port = ip6_get_port (fip, 0, fb->current_length);
      if (!reass->l4_src_port || !reass->l4_dst_port)
	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
	      vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
	      vnet_buffer (b0)->ip.reass.l4_src_port =
		ip6_get_port (ip0, 1, b0->current_length);
	      vnet_buffer (b0)->ip.reass.l4_dst_port =
		ip6_get_port (ip0, 0, b0->current_length);
	      next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
	      goto packet_enqueue;
	    }
	  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;
	    }
	  vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
	    (u8 *) frag_hdr - (u8 *) ip0;

	  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;
	      goto packet_enqueue;
	    }

	  if (reass->is_complete)
	    {
	      vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
	      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;
	      error0 = IP6_ERROR_NONE;
	      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;
	    }

	  b0->error = node->errors[error0];

	  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);
		  }
		vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
		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 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_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 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_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 vnet_feature_enable_disable ("ip6-unicast",
				      "ip6-sv-reassembly-feature",
				      sw_if_index, enable_disable, 0, 0);
}
#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 -1;
}
#endif

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