ikev2.c

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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.
 */

#include <vlib/vlib.h>
#include <vlib/unix/plugin.h>
#include <vlibmemory/api.h>
#include <vpp/app/version.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vppinfra/error.h>
#include <vppinfra/random.h>
#include <vnet/udp/udp.h>
#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/ipsec_tun.h>
#include <vnet/ipip/ipip.h>
#include <plugins/ikev2/ikev2.h>
#include <plugins/ikev2/ikev2_priv.h>
#include <openssl/sha.h>

#define IKEV2_LIVENESS_RETRIES 3
#define IKEV2_LIVENESS_PERIOD_CHECK 30

ikev2_main_t ikev2_main;

static int ikev2_delete_tunnel_interface (vnet_main_t * vnm,
                                          ikev2_sa_t * sa,
                                          ikev2_child_sa_t * child);

#define ikev2_set_state(sa, v) do { \
    (sa)->state = v; \
    ikev2_elog_sa_state("ispi %lx SA state changed to " #v, sa->ispi); \
  } while(0);

typedef struct
{
  u32 next_index;
  u32 sw_if_index;
} ikev2_trace_t;

static u8 *
format_ikev2_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 *);
  ikev2_trace_t *t = va_arg (*args, ikev2_trace_t *);

  s = format (s, "ikev2: sw_if_index %d, next index %d",
              t->sw_if_index, t->next_index);
  return s;
}

static vlib_node_registration_t ikev2_node;

#define foreach_ikev2_error \
_(PROCESSED, "IKEv2 packets processed") \
_(IKE_SA_INIT_RETRANSMIT, "IKE_SA_INIT retransmit ") \
_(IKE_SA_INIT_IGNORE, "IKE_SA_INIT ignore (IKE SA already auth)") \
_(IKE_REQ_RETRANSMIT, "IKE request retransmit") \
_(IKE_REQ_IGNORE, "IKE request ignore (old msgid)") \
_(NOT_IKEV2, "Non IKEv2 packets received")

typedef enum
{
#define _(sym,str) IKEV2_ERROR_##sym,
  foreach_ikev2_error
#undef _
    IKEV2_N_ERROR,
} ikev2_error_t;

static char *ikev2_error_strings[] = {
#define _(sym,string) string,
  foreach_ikev2_error
#undef _
};

typedef enum
{
  IKEV2_NEXT_IP4_LOOKUP,
  IKEV2_NEXT_ERROR_DROP,
  IKEV2_N_NEXT,
} ikev2_next_t;

static ikev2_sa_transform_t *
ikev2_find_transform_data (ikev2_sa_transform_t * t)
{
  ikev2_main_t *km = &ikev2_main;
  ikev2_sa_transform_t *td;

  vec_foreach (td, km->supported_transforms)
  {
    if (td->type != t->type)
      continue;

    if (td->transform_id != t->transform_id)
      continue;

    if (td->type == IKEV2_TRANSFORM_TYPE_ENCR)
      {
        if (vec_len (t->attrs) != 4 || t->attrs[0] != 0x80
            || t->attrs[1] != 14)
          continue;

        if (((t->attrs[2] << 8 | t->attrs[3]) / 8) != td->key_len)
          continue;
      }
    return td;
  }
  return 0;
}

static ikev2_sa_proposal_t *
ikev2_select_proposal (ikev2_sa_proposal_t * proposals,
                       ikev2_protocol_id_t prot_id)
{
  ikev2_sa_proposal_t *rv = 0;
  ikev2_sa_proposal_t *proposal;
  ikev2_sa_transform_t *transform, *new_t;
  u8 mandatory_bitmap, optional_bitmap;

  if (prot_id == IKEV2_PROTOCOL_IKE)
    {
      mandatory_bitmap = (1 << IKEV2_TRANSFORM_TYPE_ENCR) |
        (1 << IKEV2_TRANSFORM_TYPE_PRF) |
        (1 << IKEV2_TRANSFORM_TYPE_INTEG) | (1 << IKEV2_TRANSFORM_TYPE_DH);
      optional_bitmap = mandatory_bitmap;
    }
  else if (prot_id == IKEV2_PROTOCOL_ESP)
    {
      mandatory_bitmap = (1 << IKEV2_TRANSFORM_TYPE_ENCR) |
        (1 << IKEV2_TRANSFORM_TYPE_ESN);
      optional_bitmap = mandatory_bitmap |
        (1 << IKEV2_TRANSFORM_TYPE_INTEG) | (1 << IKEV2_TRANSFORM_TYPE_DH);
    }
  else if (prot_id == IKEV2_PROTOCOL_AH)
    {
      mandatory_bitmap = (1 << IKEV2_TRANSFORM_TYPE_INTEG) |
        (1 << IKEV2_TRANSFORM_TYPE_ESN);
      optional_bitmap = mandatory_bitmap | (1 << IKEV2_TRANSFORM_TYPE_DH);
    }
  else
    return 0;

  vec_add2 (rv, proposal, 1);

  vec_foreach (proposal, proposals)
  {
    u8 bitmap = 0;
    if (proposal->protocol_id != prot_id)
      continue;

    vec_foreach (transform, proposal->transforms)
    {
      if ((1 << transform->type) & bitmap)
        continue;

      if (ikev2_find_transform_data (transform))
        {
          bitmap |= 1 << transform->type;
          vec_add2 (rv->transforms, new_t, 1);
          clib_memcpy_fast (new_t, transform, sizeof (*new_t));
          new_t->attrs = vec_dup (transform->attrs);
        }
    }

    if ((bitmap & mandatory_bitmap) == mandatory_bitmap &&
        (bitmap & ~optional_bitmap) == 0)
      {
        rv->proposal_num = proposal->proposal_num;
        rv->protocol_id = proposal->protocol_id;
        RAND_bytes ((u8 *) & rv->spi, sizeof (rv->spi));
        goto done;
      }
    else
      {
        vec_free (rv->transforms);
      }
  }

  vec_free (rv);
done:
  return rv;
}

ikev2_sa_transform_t *
ikev2_sa_get_td_for_type (ikev2_sa_proposal_t * p,
                          ikev2_transform_type_t type)
{
  ikev2_sa_transform_t *t;

  if (!p)
    return 0;

  vec_foreach (t, p->transforms)
  {
    if (t->type == type)
      return ikev2_find_transform_data (t);
  }
  return 0;
}

ikev2_child_sa_t *
ikev2_sa_get_child (ikev2_sa_t * sa, u32 spi, ikev2_protocol_id_t prot_id,
                    int by_initiator)
{
  ikev2_child_sa_t *c;
  vec_foreach (c, sa->childs)
  {
    ikev2_sa_proposal_t *proposal =
      by_initiator ? &c->i_proposals[0] : &c->r_proposals[0];
    if (proposal && proposal->spi == spi && proposal->protocol_id == prot_id)
      return c;
  }

  return 0;
}

void
ikev2_sa_free_proposal_vector (ikev2_sa_proposal_t ** v)
{
  ikev2_sa_proposal_t *p;
  ikev2_sa_transform_t *t;

  if (!*v)
    return;

  vec_foreach (p, *v)
  {
    vec_foreach (t, p->transforms)
    {
      vec_free (t->attrs);
    }
    vec_free (p->transforms);
  }
  vec_free (*v);
};

static void
ikev2_sa_free_child_sa (ikev2_child_sa_t * c)
{
  ikev2_sa_free_proposal_vector (&c->r_proposals);
  ikev2_sa_free_proposal_vector (&c->i_proposals);
  vec_free (c->sk_ai);
  vec_free (c->sk_ar);
  vec_free (c->sk_ei);
  vec_free (c->sk_er);
  vec_free (c->tsi);
  vec_free (c->tsr);
}

static void
ikev2_sa_free_all_child_sa (ikev2_child_sa_t ** childs)
{
  ikev2_child_sa_t *c;
  vec_foreach (c, *childs) ikev2_sa_free_child_sa (c);

  vec_free (*childs);
}

static void
ikev2_sa_del_child_sa (ikev2_sa_t * sa, ikev2_child_sa_t * child)
{
  ikev2_sa_free_child_sa (child);
  vec_del1 (sa->childs, child - sa->childs);
}

static void
ikev2_sa_free_all_vec (ikev2_sa_t * sa)
{
  vec_free (sa->i_nonce);
  vec_free (sa->i_dh_data);
  vec_free (sa->dh_shared_key);
  vec_free (sa->dh_private_key);

  ikev2_sa_free_proposal_vector (&sa->r_proposals);
  ikev2_sa_free_proposal_vector (&sa->i_proposals);

  vec_free (sa->sk_d);
  vec_free (sa->sk_ai);
  vec_free (sa->sk_ar);
  vec_free (sa->sk_ei);
  vec_free (sa->sk_er);
  vec_free (sa->sk_pi);
  vec_free (sa->sk_pr);

  vec_free (sa->i_id.data);
  vec_free (sa->i_auth.data);
  vec_free (sa->r_id.data);
  vec_free (sa->r_auth.data);
  if (sa->r_auth.key)
    EVP_PKEY_free (sa->r_auth.key);

  vec_free (sa->del);

  ikev2_sa_free_all_child_sa (&sa->childs);
}

static void
ikev2_delete_sa (ikev2_sa_t * sa)
{
  ikev2_main_t *km = &ikev2_main;
  u32 thread_index = vlib_get_thread_index ();
  uword *p;

  ikev2_sa_free_all_vec (sa);

  p = hash_get (km->per_thread_data[thread_index].sa_by_rspi, sa->rspi);
  if (p)
    {
      hash_unset (km->per_thread_data[thread_index].sa_by_rspi, sa->rspi);
      pool_put (km->per_thread_data[thread_index].sas, sa);
    }
}

static void
ikev2_generate_sa_init_data (ikev2_sa_t * sa)
{
  ikev2_sa_transform_t *t = 0, *t2;
  ikev2_main_t *km = &ikev2_main;

  if (sa->dh_group == IKEV2_TRANSFORM_DH_TYPE_NONE)
    {
      return;
    }

  /* check if received DH group is on our list of supported groups */
  vec_foreach (t2, km->supported_transforms)
  {
    if (t2->type == IKEV2_TRANSFORM_TYPE_DH && sa->dh_group == t2->dh_type)
      {
        t = t2;
        break;
      }
  }

  if (!t)
    {
      sa->dh_group = IKEV2_TRANSFORM_DH_TYPE_NONE;
      return;
    }

  if (sa->is_initiator)
    {
      /* generate rspi */
      RAND_bytes ((u8 *) & sa->ispi, 8);

      /* generate nonce */
      sa->i_nonce = vec_new (u8, IKEV2_NONCE_SIZE);
      RAND_bytes ((u8 *) sa->i_nonce, IKEV2_NONCE_SIZE);
    }
  else
    {
      /* generate rspi */
      RAND_bytes ((u8 *) & sa->rspi, 8);

      /* generate nonce */
      sa->r_nonce = vec_new (u8, IKEV2_NONCE_SIZE);
      RAND_bytes ((u8 *) sa->r_nonce, IKEV2_NONCE_SIZE);
    }

  /* generate dh keys */
  ikev2_generate_dh (sa, t);

}

static void
ikev2_complete_sa_data (ikev2_sa_t * sa, ikev2_sa_t * sai)
{
  ikev2_sa_transform_t *t = 0, *t2;
  ikev2_main_t *km = &ikev2_main;

  /*move some data to the new SA */
#define _(A) ({void* __tmp__ = (A); (A) = 0; __tmp__;})
  sa->i_nonce = _(sai->i_nonce);
  sa->i_dh_data = _(sai->i_dh_data);
  sa->dh_private_key = _(sai->dh_private_key);
  sa->iaddr.as_u32 = sai->iaddr.as_u32;
  sa->raddr.as_u32 = sai->raddr.as_u32;
  sa->is_initiator = sai->is_initiator;
  sa->i_id.type = sai->i_id.type;
  sa->profile_index = sai->profile_index;
  sa->is_profile_index_set = sai->is_profile_index_set;
  sa->tun_itf = sai->tun_itf;
  sa->is_tun_itf_set = sai->is_tun_itf_set;
  sa->i_id.data = _(sai->i_id.data);
  sa->i_auth.method = sai->i_auth.method;
  sa->i_auth.hex = sai->i_auth.hex;
  sa->i_auth.data = _(sai->i_auth.data);
  sa->i_auth.key = _(sai->i_auth.key);
  sa->last_sa_init_req_packet_data = _(sai->last_sa_init_req_packet_data);
  sa->childs = _(sai->childs);
  sa->udp_encap = sai->udp_encap;
  sa->dst_port = sai->dst_port;
#undef _


  if (sa->dh_group == IKEV2_TRANSFORM_DH_TYPE_NONE)
    {
      return;
    }

  /* check if received DH group is on our list of supported groups */
  vec_foreach (t2, km->supported_transforms)
  {
    if (t2->type == IKEV2_TRANSFORM_TYPE_DH && sa->dh_group == t2->dh_type)
      {
        t = t2;
        break;
      }
  }

  if (!t)
    {
      sa->dh_group = IKEV2_TRANSFORM_DH_TYPE_NONE;
      return;
    }


  /* generate dh keys */
  ikev2_complete_dh (sa, t);

}

static void
ikev2_calc_keys (ikev2_sa_t * sa)
{
  u8 *tmp;
  /* calculate SKEYSEED = prf(Ni | Nr, g^ir) */
  u8 *skeyseed = 0;
  u8 *s = 0;
  u16 integ_key_len = 0;
  ikev2_sa_transform_t *tr_encr, *tr_prf, *tr_integ;
  tr_encr =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_ENCR);
  tr_prf =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF);
  tr_integ =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG);

  if (tr_integ)
    integ_key_len = tr_integ->key_len;

  vec_append (s, sa->i_nonce);
  vec_append (s, sa->r_nonce);
  skeyseed = ikev2_calc_prf (tr_prf, s, sa->dh_shared_key);

  /* Calculate S = Ni | Nr | SPIi | SPIr */
  u64 *spi;
  vec_add2 (s, tmp, 2 * sizeof (*spi));
  spi = (u64 *) tmp;
  spi[0] = clib_host_to_net_u64 (sa->ispi);
  spi[1] = clib_host_to_net_u64 (sa->rspi);

  /* calculate PRFplus */
  u8 *keymat;
  int len = tr_prf->key_trunc + /* SK_d */
    integ_key_len * 2 +         /* SK_ai, SK_ar */
    tr_encr->key_len * 2 +      /* SK_ei, SK_er */
    tr_prf->key_len * 2;        /* SK_pi, SK_pr */

  keymat = ikev2_calc_prfplus (tr_prf, skeyseed, s, len);
  vec_free (skeyseed);
  vec_free (s);

  int pos = 0;

  /* SK_d */
  sa->sk_d = vec_new (u8, tr_prf->key_trunc);
  clib_memcpy_fast (sa->sk_d, keymat + pos, tr_prf->key_trunc);
  pos += tr_prf->key_trunc;

  if (integ_key_len)
    {
      /* SK_ai */
      sa->sk_ai = vec_new (u8, integ_key_len);
      clib_memcpy_fast (sa->sk_ai, keymat + pos, integ_key_len);
      pos += integ_key_len;

      /* SK_ar */
      sa->sk_ar = vec_new (u8, integ_key_len);
      clib_memcpy_fast (sa->sk_ar, keymat + pos, integ_key_len);
      pos += integ_key_len;
    }

  /* SK_ei */
  sa->sk_ei = vec_new (u8, tr_encr->key_len);
  clib_memcpy_fast (sa->sk_ei, keymat + pos, tr_encr->key_len);
  pos += tr_encr->key_len;

  /* SK_er */
  sa->sk_er = vec_new (u8, tr_encr->key_len);
  clib_memcpy_fast (sa->sk_er, keymat + pos, tr_encr->key_len);
  pos += tr_encr->key_len;

  /* SK_pi */
  sa->sk_pi = vec_new (u8, tr_prf->key_len);
  clib_memcpy_fast (sa->sk_pi, keymat + pos, tr_prf->key_len);
  pos += tr_prf->key_len;

  /* SK_pr */
  sa->sk_pr = vec_new (u8, tr_prf->key_len);
  clib_memcpy_fast (sa->sk_pr, keymat + pos, tr_prf->key_len);
  pos += tr_prf->key_len;

  vec_free (keymat);
}

static void
ikev2_calc_child_keys (ikev2_sa_t * sa, ikev2_child_sa_t * child)
{
  u8 *s = 0;
  u16 integ_key_len = 0;
  u8 salt_len = 0;

  ikev2_sa_transform_t *tr_prf, *ctr_encr, *ctr_integ;
  tr_prf =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF);
  ctr_encr =
    ikev2_sa_get_td_for_type (child->r_proposals, IKEV2_TRANSFORM_TYPE_ENCR);
  ctr_integ =
    ikev2_sa_get_td_for_type (child->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG);

  if (ctr_integ)
    integ_key_len = ctr_integ->key_len;
  else
    salt_len = sizeof (u32);

  vec_append (s, sa->i_nonce);
  vec_append (s, sa->r_nonce);
  /* calculate PRFplus */
  u8 *keymat;
  int len = ctr_encr->key_len * 2 + integ_key_len * 2 + salt_len * 2;

  keymat = ikev2_calc_prfplus (tr_prf, sa->sk_d, s, len);

  int pos = 0;

  /* SK_ei */
  child->sk_ei = vec_new (u8, ctr_encr->key_len);
  clib_memcpy_fast (child->sk_ei, keymat + pos, ctr_encr->key_len);
  pos += ctr_encr->key_len;

  if (ctr_integ)
    {
      /* SK_ai */
      child->sk_ai = vec_new (u8, ctr_integ->key_len);
      clib_memcpy_fast (child->sk_ai, keymat + pos, ctr_integ->key_len);
      pos += ctr_integ->key_len;
    }
  else
    {
      clib_memcpy (&child->salt_ei, keymat + pos, salt_len);
      pos += salt_len;
    }

  /* SK_er */
  child->sk_er = vec_new (u8, ctr_encr->key_len);
  clib_memcpy_fast (child->sk_er, keymat + pos, ctr_encr->key_len);
  pos += ctr_encr->key_len;

  if (ctr_integ)
    {
      /* SK_ar */
      child->sk_ar = vec_new (u8, integ_key_len);
      clib_memcpy_fast (child->sk_ar, keymat + pos, integ_key_len);
      pos += integ_key_len;
    }
  else
    {
      clib_memcpy (&child->salt_er, keymat + pos, salt_len);
      pos += salt_len;
    }

  ASSERT (pos == len);

  vec_free (keymat);
}

static void
ikev2_process_sa_init_req (vlib_main_t * vm, ikev2_sa_t * sa,
                           ike_header_t * ike)
{
  int p = 0;
  u32 len = clib_net_to_host_u32 (ike->length);
  u8 payload = ike->nextpayload;

  ikev2_elog_exchange ("ispi %lx rspi %lx IKE_INIT request received "
                       "from %d.%d.%d.%d",
                       clib_net_to_host_u64 (ike->ispi),
                       clib_net_to_host_u64 (ike->rspi), sa->iaddr.as_u32);

  sa->ispi = clib_net_to_host_u64 (ike->ispi);

  /* store whole IKE payload - needed for PSK auth */
  vec_free (sa->last_sa_init_req_packet_data);
  vec_add (sa->last_sa_init_req_packet_data, ike, len);

  while (p < len && payload != IKEV2_PAYLOAD_NONE)
    {
      ike_payload_header_t *ikep = (ike_payload_header_t *) & ike->payload[p];
      u32 plen = clib_net_to_host_u16 (ikep->length);

      if (plen < sizeof (ike_payload_header_t))
        return;

      if (payload == IKEV2_PAYLOAD_SA)
        {
          ikev2_sa_free_proposal_vector (&sa->i_proposals);
          sa->i_proposals = ikev2_parse_sa_payload (ikep);
        }
      else if (payload == IKEV2_PAYLOAD_KE)
        {
          ike_ke_payload_header_t *ke = (ike_ke_payload_header_t *) ikep;
          sa->dh_group = clib_net_to_host_u16 (ke->dh_group);
          vec_free (sa->i_dh_data);
          vec_add (sa->i_dh_data, ke->payload, plen - sizeof (*ke));
        }
      else if (payload == IKEV2_PAYLOAD_NONCE)
        {
          vec_free (sa->i_nonce);
          vec_add (sa->i_nonce, ikep->payload, plen - sizeof (*ikep));
        }
      else if (payload == IKEV2_PAYLOAD_NOTIFY)
        {
          ikev2_notify_t *n = ikev2_parse_notify_payload (ikep);
          vec_free (n);
        }
      else if (payload == IKEV2_PAYLOAD_VENDOR)
        {
          ikev2_parse_vendor_payload (ikep);
        }
      else
        {
          ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d",
                           payload);
          if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL)
            {
              ikev2_set_state (sa, IKEV2_STATE_NOTIFY_AND_DELETE);
              sa->unsupported_cp = payload;
              return;
            }
        }

      payload = ikep->nextpayload;
      p += plen;
    }

  ikev2_set_state (sa, IKEV2_STATE_SA_INIT);
}

static void
ikev2_process_sa_init_resp (vlib_main_t * vm, ikev2_sa_t * sa,
                            ike_header_t * ike)
{
  int p = 0;
  u32 len = clib_net_to_host_u32 (ike->length);
  u8 payload = ike->nextpayload;

  sa->ispi = clib_net_to_host_u64 (ike->ispi);
  sa->rspi = clib_net_to_host_u64 (ike->rspi);

  ikev2_elog_exchange ("ispi %lx rspi %lx IKE_INIT response received "
                       "from %d.%d.%d.%d", sa->ispi, sa->rspi,
                       sa->raddr.as_u32);

  /* store whole IKE payload - needed for PSK auth */
  vec_free (sa->last_sa_init_res_packet_data);
  vec_add (sa->last_sa_init_res_packet_data, ike, len);

  while (p < len && payload != IKEV2_PAYLOAD_NONE)
    {
      ike_payload_header_t *ikep = (ike_payload_header_t *) & ike->payload[p];
      u32 plen = clib_net_to_host_u16 (ikep->length);

      if (plen < sizeof (ike_payload_header_t))
        return;

      if (payload == IKEV2_PAYLOAD_SA)
        {
          ikev2_sa_free_proposal_vector (&sa->r_proposals);
          sa->r_proposals = ikev2_parse_sa_payload (ikep);
          if (sa->r_proposals)
            {
              ikev2_set_state (sa, IKEV2_STATE_SA_INIT);
              ike->msgid =
                clib_host_to_net_u32 (clib_net_to_host_u32 (ike->msgid) + 1);
            }
        }
      else if (payload == IKEV2_PAYLOAD_KE)
        {
          ike_ke_payload_header_t *ke = (ike_ke_payload_header_t *) ikep;
          sa->dh_group = clib_net_to_host_u16 (ke->dh_group);
          vec_free (sa->r_dh_data);
          vec_add (sa->r_dh_data, ke->payload, plen - sizeof (*ke));
        }
      else if (payload == IKEV2_PAYLOAD_NONCE)
        {
          vec_free (sa->r_nonce);
          vec_add (sa->r_nonce, ikep->payload, plen - sizeof (*ikep));
        }
      else if (payload == IKEV2_PAYLOAD_NOTIFY)
        {
          ikev2_notify_t *n = ikev2_parse_notify_payload (ikep);
          vec_free (n);
        }
      else if (payload == IKEV2_PAYLOAD_VENDOR)
        {
          ikev2_parse_vendor_payload (ikep);
        }
      else
        {
          ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d",
                           payload);
          if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL)
            {
              ikev2_set_state (sa, IKEV2_STATE_NOTIFY_AND_DELETE);
              sa->unsupported_cp = payload;
              return;
            }
        }

      payload = ikep->nextpayload;
      p += plen;
    }
}

static u8 *
ikev2_decrypt_sk_payload (ikev2_sa_t * sa, ike_header_t * ike, u8 * payload)
{
  int p = 0;
  u8 last_payload = 0;
  u8 *hmac = 0;
  u32 len = clib_net_to_host_u32 (ike->length);
  ike_payload_header_t *ikep = 0;
  u32 plen = 0;
  ikev2_sa_transform_t *tr_integ;
  tr_integ =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG);

  while (p < len &&
         *payload != IKEV2_PAYLOAD_NONE && last_payload != IKEV2_PAYLOAD_SK)
    {
      ikep = (ike_payload_header_t *) & ike->payload[p];
      plen = clib_net_to_host_u16 (ikep->length);

      if (plen < sizeof (*ikep))
        return 0;

      if (*payload == IKEV2_PAYLOAD_SK)
        {
          last_payload = *payload;
        }
      else
        {
          ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d",
                           *payload);
          if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL)
            {
              sa->unsupported_cp = *payload;
              return 0;
            }
        }

      *payload = ikep->nextpayload;
      p += plen;
    }

  if (last_payload != IKEV2_PAYLOAD_SK)
    {
      ikev2_elog_error ("Last payload must be SK");
      return 0;
    }

  hmac =
    ikev2_calc_integr (tr_integ, sa->is_initiator ? sa->sk_ar : sa->sk_ai,
                       (u8 *) ike, len - tr_integ->key_trunc);

  plen = plen - sizeof (*ikep) - tr_integ->key_trunc;

  if (memcmp (hmac, &ikep->payload[plen], tr_integ->key_trunc))
    {
      ikev2_elog_error ("message integrity check failed");
      vec_free (hmac);
      return 0;
    }
  vec_free (hmac);

  return ikev2_decrypt_data (sa, ikep->payload, plen);
}

static void
ikev2_initial_contact_cleanup (ikev2_sa_t * sa)
{
  ikev2_main_t *km = &ikev2_main;
  ikev2_sa_t *tmp;
  u32 i, *delete = 0;
  ikev2_child_sa_t *c;
  u32 thread_index = vlib_get_thread_index ();

  if (!sa->initial_contact)
    return;

  /* find old IKE SAs with the same authenticated identity */
  /* *INDENT-OFF* */
  pool_foreach (tmp, km->per_thread_data[thread_index].sas, ({
        if (tmp->i_id.type != sa->i_id.type ||
            vec_len(tmp->i_id.data) != vec_len(sa->i_id.data) ||
            memcmp(sa->i_id.data, tmp->i_id.data, vec_len(sa->i_id.data)))
          continue;

        if (sa->rspi != tmp->rspi)
          vec_add1(delete, tmp - km->per_thread_data[thread_index].sas);
  }));
  /* *INDENT-ON* */

  for (i = 0; i < vec_len (delete); i++)
    {
      tmp =
        pool_elt_at_index (km->per_thread_data[thread_index].sas, delete[i]);
      vec_foreach (c,
                   tmp->childs) ikev2_delete_tunnel_interface (km->vnet_main,
                                                               tmp, c);
      ikev2_delete_sa (tmp);
    }

  vec_free (delete);
  sa->initial_contact = 0;
}

static void
ikev2_process_auth_req (vlib_main_t * vm, ikev2_sa_t * sa, ike_header_t * ike)
{
  ikev2_child_sa_t *first_child_sa;
  int p = 0;
  u8 payload = ike->nextpayload;
  u8 *plaintext = 0;
  ike_payload_header_t *ikep;
  u32 plen;

  ikev2_elog_exchange ("ispi %lx rspi %lx EXCHANGE_IKE_AUTH received "
                       "from %d.%d.%d.%d", clib_host_to_net_u64 (ike->ispi),
                       clib_host_to_net_u64 (ike->rspi),
                       sa->is_initiator ? sa->raddr.as_u32 : sa->
                       iaddr.as_u32);

  ikev2_calc_keys (sa);

  plaintext = ikev2_decrypt_sk_payload (sa, ike, &payload);

  if (!plaintext)
    {
      if (sa->unsupported_cp)
        ikev2_set_state (sa, IKEV2_STATE_NOTIFY_AND_DELETE);
      goto cleanup_and_exit;
    }

  /* select or create 1st child SA */
  if (sa->is_initiator)
    {
      first_child_sa = &sa->childs[0];
    }
  else
    {
      ikev2_sa_free_all_child_sa (&sa->childs);
      vec_add2 (sa->childs, first_child_sa, 1);
    }


  /* process encrypted payload */
  p = 0;
  while (p < vec_len (plaintext) && payload != IKEV2_PAYLOAD_NONE)
    {
      ikep = (ike_payload_header_t *) & plaintext[p];
      plen = clib_net_to_host_u16 (ikep->length);

      if (plen < sizeof (ike_payload_header_t))
        goto cleanup_and_exit;

      if (payload == IKEV2_PAYLOAD_SA)  /* 33 */
        {
          if (sa->is_initiator)
            {
              ikev2_sa_free_proposal_vector (&first_child_sa->r_proposals);
              first_child_sa->r_proposals = ikev2_parse_sa_payload (ikep);
            }
          else
            {
              ikev2_sa_free_proposal_vector (&first_child_sa->i_proposals);
              first_child_sa->i_proposals = ikev2_parse_sa_payload (ikep);
            }
        }
      else if (payload == IKEV2_PAYLOAD_IDI)    /* 35 */
        {
          ike_id_payload_header_t *id = (ike_id_payload_header_t *) ikep;

          sa->i_id.type = id->id_type;
          vec_free (sa->i_id.data);
          vec_add (sa->i_id.data, id->payload, plen - sizeof (*id));
        }
      else if (payload == IKEV2_PAYLOAD_IDR)    /* 36 */
        {
          ike_id_payload_header_t *id = (ike_id_payload_header_t *) ikep;

          sa->r_id.type = id->id_type;
          vec_free (sa->r_id.data);
          vec_add (sa->r_id.data, id->payload, plen - sizeof (*id));
        }
      else if (payload == IKEV2_PAYLOAD_AUTH)   /* 39 */
        {
          ike_auth_payload_header_t *a = (ike_auth_payload_header_t *) ikep;

          if (sa->is_initiator)
            {
              sa->r_auth.method = a->auth_method;
              vec_free (sa->r_auth.data);
              vec_add (sa->r_auth.data, a->payload, plen - sizeof (*a));
            }
          else
            {
              sa->i_auth.method = a->auth_method;
              vec_free (sa->i_auth.data);
              vec_add (sa->i_auth.data, a->payload, plen - sizeof (*a));
            }
        }
      else if (payload == IKEV2_PAYLOAD_NOTIFY) /* 41 */
        {
          ikev2_notify_t *n = ikev2_parse_notify_payload (ikep);
          if (n->msg_type == IKEV2_NOTIFY_MSG_INITIAL_CONTACT)
            {
              sa->initial_contact = 1;
            }
          vec_free (n);
        }
      else if (payload == IKEV2_PAYLOAD_VENDOR) /* 43 */
        {
          ikev2_parse_vendor_payload (ikep);
        }
      else if (payload == IKEV2_PAYLOAD_TSI)    /* 44 */
        {
          vec_free (first_child_sa->tsi);
          first_child_sa->tsi = ikev2_parse_ts_payload (ikep);
        }
      else if (payload == IKEV2_PAYLOAD_TSR)    /* 45 */
        {
          vec_free (first_child_sa->tsr);
          first_child_sa->tsr = ikev2_parse_ts_payload (ikep);
        }
      else
        {
          ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d",
                           payload);

          if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL)
            {
              ikev2_set_state (sa, IKEV2_STATE_NOTIFY_AND_DELETE);
              sa->unsupported_cp = payload;
              return;
            }
        }

      payload = ikep->nextpayload;
      p += plen;
    }

cleanup_and_exit:
  vec_free (plaintext);
}

static void
ikev2_process_informational_req (vlib_main_t * vm, ikev2_sa_t * sa,
                                 ike_header_t * ike)
{
  int p = 0;
  u8 payload = ike->nextpayload;
  u8 *plaintext = 0;
  ike_payload_header_t *ikep;
  u32 plen;

  sa->liveness_retries = 0;
  ikev2_elog_exchange ("ispi %lx rspi %lx INFORMATIONAL received "
                       "from %d.%d.%d.%d", clib_host_to_net_u64 (ike->ispi),
                       clib_host_to_net_u64 (ike->rspi), sa->iaddr.as_u32);

  plaintext = ikev2_decrypt_sk_payload (sa, ike, &payload);

  if (!plaintext)
    goto cleanup_and_exit;

  /* process encrypted payload */
  p = 0;
  while (p < vec_len (plaintext) && payload != IKEV2_PAYLOAD_NONE)
    {
      ikep = (ike_payload_header_t *) & plaintext[p];
      plen = clib_net_to_host_u16 (ikep->length);

      if (plen < sizeof (ike_payload_header_t))
        goto cleanup_and_exit;

      if (payload == IKEV2_PAYLOAD_NOTIFY)      /* 41 */
        {
          ikev2_notify_t *n = ikev2_parse_notify_payload (ikep);
          if (n->msg_type == IKEV2_NOTIFY_MSG_AUTHENTICATION_FAILED)
            ikev2_set_state (sa, IKEV2_STATE_AUTH_FAILED);
          vec_free (n);
        }
      else if (payload == IKEV2_PAYLOAD_DELETE) /* 42 */
        {
          sa->del = ikev2_parse_delete_payload (ikep);
        }
      else if (payload == IKEV2_PAYLOAD_VENDOR) /* 43 */
        {
          ikev2_parse_vendor_payload (ikep);
        }
      else
        {
          ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d",
                           payload);
          if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL)
            {
              sa->unsupported_cp = payload;
              return;
            }
        }

      payload = ikep->nextpayload;
      p += plen;
    }

cleanup_and_exit:
  vec_free (plaintext);
}

static void
ikev2_process_create_child_sa_req (vlib_main_t * vm, ikev2_sa_t * sa,
                                   ike_header_t * ike)
{
  int p = 0;
  u8 payload = ike->nextpayload;
  u8 *plaintext = 0;
  u8 rekeying = 0;
  u8 nonce[IKEV2_NONCE_SIZE];

  ike_payload_header_t *ikep;
  u32 plen;
  ikev2_notify_t *n = 0;
  ikev2_ts_t *tsi = 0;
  ikev2_ts_t *tsr = 0;
  ikev2_sa_proposal_t *proposal = 0;
  ikev2_child_sa_t *child_sa;

  ikev2_elog_exchange ("ispi %lx rspi %lx CREATE_CHILD_SA received "
                       "from %d.%d.%d.%d", clib_host_to_net_u64 (ike->ispi),
                       clib_host_to_net_u64 (ike->rspi), sa->raddr.as_u32);

  plaintext = ikev2_decrypt_sk_payload (sa, ike, &payload);

  if (!plaintext)
    goto cleanup_and_exit;

  /* process encrypted payload */
  p = 0;
  while (p < vec_len (plaintext) && payload != IKEV2_PAYLOAD_NONE)
    {
      ikep = (ike_payload_header_t *) & plaintext[p];
      plen = clib_net_to_host_u16 (ikep->length);

      if (plen < sizeof (ike_payload_header_t))
        goto cleanup_and_exit;

      else if (payload == IKEV2_PAYLOAD_SA)
        {
          proposal = ikev2_parse_sa_payload (ikep);
        }
      else if (payload == IKEV2_PAYLOAD_NOTIFY)
        {
          n = ikev2_parse_notify_payload (ikep);
          if (n->msg_type == IKEV2_NOTIFY_MSG_REKEY_SA)
            {
              rekeying = 1;
            }
        }
      else if (payload == IKEV2_PAYLOAD_DELETE)
        {
          sa->del = ikev2_parse_delete_payload (ikep);
        }
      else if (payload == IKEV2_PAYLOAD_VENDOR)
        {
          ikev2_parse_vendor_payload (ikep);
        }
      else if (payload == IKEV2_PAYLOAD_NONCE)
        {
          clib_memcpy_fast (nonce, ikep->payload, plen - sizeof (*ikep));
        }
      else if (payload == IKEV2_PAYLOAD_TSI)
        {
          tsi = ikev2_parse_ts_payload (ikep);
        }
      else if (payload == IKEV2_PAYLOAD_TSR)
        {
          tsr = ikev2_parse_ts_payload (ikep);
        }
      else
        {
          ikev2_elog_uint (IKEV2_LOG_ERROR, "Unknown payload! type=%d",
                           payload);
          if (ikep->flags & IKEV2_PAYLOAD_FLAG_CRITICAL)
            {
              sa->unsupported_cp = payload;
              return;
            }
        }

      payload = ikep->nextpayload;
      p += plen;
    }

  if (sa->is_initiator && proposal->protocol_id == IKEV2_PROTOCOL_ESP)
    {
      ikev2_rekey_t *rekey = &sa->rekey[0];
      rekey->protocol_id = proposal->protocol_id;
      rekey->i_proposal =
        ikev2_select_proposal (proposal, IKEV2_PROTOCOL_ESP);
      rekey->i_proposal->spi = rekey->spi;
      rekey->r_proposal = proposal;
      rekey->tsi = tsi;
      rekey->tsr = tsr;
      /* update Nr */
      vec_free (sa->r_nonce);
      vec_add (sa->r_nonce, nonce, IKEV2_NONCE_SIZE);
      child_sa = ikev2_sa_get_child (sa, rekey->ispi, IKEV2_PROTOCOL_ESP, 1);
      if (child_sa)
        {
          child_sa->rekey_retries = 0;
        }
    }
  else if (rekeying)
    {
      ikev2_rekey_t *rekey;
      child_sa = ikev2_sa_get_child (sa, n->spi, n->protocol_id, 1);
      if (!child_sa)
        {
          ikev2_elog_uint (IKEV2_LOG_ERROR, "child SA spi %lx not found",
                           n->spi);
          goto cleanup_and_exit;
        }
      vec_add2 (sa->rekey, rekey, 1);
      rekey->protocol_id = n->protocol_id;
      rekey->spi = n->spi;
      rekey->i_proposal = proposal;
      rekey->r_proposal =
        ikev2_select_proposal (proposal, IKEV2_PROTOCOL_ESP);
      rekey->tsi = tsi;
      rekey->tsr = tsr;
      /* update Ni */
      vec_free (sa->i_nonce);
      vec_add (sa->i_nonce, nonce, IKEV2_NONCE_SIZE);
      /* generate new Nr */
      vec_free (sa->r_nonce);
      sa->r_nonce = vec_new (u8, IKEV2_NONCE_SIZE);
      RAND_bytes ((u8 *) sa->r_nonce, IKEV2_NONCE_SIZE);
    }

cleanup_and_exit:
  vec_free (plaintext);
  vec_free (n);
}

static u8 *
ikev2_sa_generate_authmsg (ikev2_sa_t * sa, int is_responder)
{
  u8 *authmsg = 0;
  u8 *data;
  u8 *nonce;
  ikev2_id_t *id;
  u8 *key;
  u8 *packet_data;
  ikev2_sa_transform_t *tr_prf;

  tr_prf =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF);

  if (is_responder)
    {
      id = &sa->r_id;
      key = sa->sk_pr;
      nonce = sa->i_nonce;
      packet_data = sa->last_sa_init_res_packet_data;
    }
  else
    {
      id = &sa->i_id;
      key = sa->sk_pi;
      nonce = sa->r_nonce;
      packet_data = sa->last_sa_init_req_packet_data;
    }

  data = vec_new (u8, 4);
  data[0] = id->type;
  vec_append (data, id->data);

  u8 *id_hash = ikev2_calc_prf (tr_prf, key, data);
  vec_append (authmsg, packet_data);
  vec_append (authmsg, nonce);
  vec_append (authmsg, id_hash);
  vec_free (id_hash);
  vec_free (data);

  return authmsg;
}

static int
ikev2_ts_cmp (ikev2_ts_t * ts1, ikev2_ts_t * ts2)
{
  if (ts1->ts_type == ts2->ts_type && ts1->protocol_id == ts2->protocol_id &&
      ts1->start_port == ts2->start_port && ts1->end_port == ts2->end_port &&
      ts1->start_addr.as_u32 == ts2->start_addr.as_u32 &&
      ts1->end_addr.as_u32 == ts2->end_addr.as_u32)
    return 1;

  return 0;
}

static void
ikev2_sa_match_ts (ikev2_sa_t * sa)
{
  ikev2_main_t *km = &ikev2_main;
  ikev2_profile_t *p;
  ikev2_ts_t *ts, *p_tsi, *p_tsr, *tsi = 0, *tsr = 0;
  ikev2_id_t *id;

  /* *INDENT-OFF* */
  pool_foreach (p, km->profiles, ({

    if (sa->is_initiator)
      {
        p_tsi = &p->loc_ts;
        p_tsr = &p->rem_ts;
        id = &sa->r_id;
      }
    else
      {
        p_tsi = &p->rem_ts;
        p_tsr = &p->loc_ts;
        id = &sa->i_id;
      }

    /* check id */
    if (p->rem_id.type != id->type ||
        vec_len(p->rem_id.data) != vec_len(id->data) ||
        memcmp(p->rem_id.data, id->data, vec_len(p->rem_id.data)))
      continue;

    vec_foreach(ts, sa->childs[0].tsi)
      {
        if (ikev2_ts_cmp(p_tsi, ts))
          {
            vec_add1 (tsi, ts[0]);
            break;
          }
      }

    vec_foreach(ts, sa->childs[0].tsr)
      {
        if (ikev2_ts_cmp(p_tsr, ts))
          {
            vec_add1 (tsr, ts[0]);
            break;
          }
      }

    break;
  }));
  /* *INDENT-ON* */

  if (tsi && tsr)
    {
      vec_free (sa->childs[0].tsi);
      vec_free (sa->childs[0].tsr);
      sa->childs[0].tsi = tsi;
      sa->childs[0].tsr = tsr;
    }
  else
    {
      vec_free (tsi);
      vec_free (tsr);
      ikev2_set_state (sa, IKEV2_STATE_TS_UNACCEPTABLE);
    }
}

static void
ikev2_sa_auth (ikev2_sa_t * sa)
{
  ikev2_main_t *km = &ikev2_main;
  ikev2_profile_t *p, *sel_p = 0;
  u8 *authmsg, *key_pad, *psk = 0, *auth = 0;
  ikev2_sa_transform_t *tr_prf;

  tr_prf =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF);

  /* only shared key and rsa signature */
  if (!(sa->i_auth.method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC ||
        sa->i_auth.method == IKEV2_AUTH_METHOD_RSA_SIG))
    {
      ikev2_elog_uint (IKEV2_LOG_ERROR,
                       "unsupported authentication method %u",
                       sa->i_auth.method);
      ikev2_set_state (sa, IKEV2_STATE_AUTH_FAILED);
      return;
    }

  key_pad = format (0, "%s", IKEV2_KEY_PAD);
  authmsg = ikev2_sa_generate_authmsg (sa, sa->is_initiator);

  ikev2_id_t *sa_id;
  ikev2_auth_t *sa_auth;

  if (sa->is_initiator)
    {
      sa_id = &sa->r_id;
      sa_auth = &sa->r_auth;
    }
  else
    {
      sa_id = &sa->i_id;
      sa_auth = &sa->i_auth;
    }

  /* *INDENT-OFF* */
  pool_foreach (p, km->profiles, ({

    /* check id */
    if (p->rem_id.type != sa_id->type ||
        vec_len(p->rem_id.data) != vec_len(sa_id->data) ||
        memcmp(p->rem_id.data, sa_id->data, vec_len(p->rem_id.data)))
      continue;

    if (sa_auth->method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC)
      {
        if (!p->auth.data ||
             p->auth.method != IKEV2_AUTH_METHOD_SHARED_KEY_MIC)
          continue;

        psk = ikev2_calc_prf(tr_prf, p->auth.data, key_pad);
        auth = ikev2_calc_prf(tr_prf, psk, authmsg);

        if (!memcmp(auth, sa_auth->data, vec_len(sa_auth->data)))
          {
            ikev2_set_state(sa, IKEV2_STATE_AUTHENTICATED);
            vec_free(auth);
            sel_p = p;
            break;
          }

      }
    else if (sa_auth->method == IKEV2_AUTH_METHOD_RSA_SIG)
      {
        if (p->auth.method != IKEV2_AUTH_METHOD_RSA_SIG)
          continue;

        if (ikev2_verify_sign(p->auth.key, sa_auth->data, authmsg) == 1)
          {
            ikev2_set_state(sa, IKEV2_STATE_AUTHENTICATED);
            sel_p = p;
            break;
          }
      }

    vec_free(auth);
    vec_free(psk);
  }));
  /* *INDENT-ON* */

  if (sel_p)
    {
      sa->udp_encap = sel_p->udp_encap;
      sa->dst_port = sel_p->dst_port;
    }
  vec_free (authmsg);

  if (sa->state == IKEV2_STATE_AUTHENTICATED)
    {
      if (!sa->is_initiator)
        {
          vec_free (sa->r_id.data);
          sa->r_id.data = vec_dup (sel_p->loc_id.data);
          sa->r_id.type = sel_p->loc_id.type;

          /* generate our auth data */
          authmsg = ikev2_sa_generate_authmsg (sa, 1);
          if (sel_p->auth.method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC)
            {
              sa->r_auth.data = ikev2_calc_prf (tr_prf, psk, authmsg);
              sa->r_auth.method = IKEV2_AUTH_METHOD_SHARED_KEY_MIC;
            }
          else if (sel_p->auth.method == IKEV2_AUTH_METHOD_RSA_SIG)
            {
              sa->r_auth.data = ikev2_calc_sign (km->pkey, authmsg);
              sa->r_auth.method = IKEV2_AUTH_METHOD_RSA_SIG;
            }
          vec_free (authmsg);

          /* select transforms for 1st child sa */
          ikev2_sa_free_proposal_vector (&sa->childs[0].r_proposals);
          sa->childs[0].r_proposals =
            ikev2_select_proposal (sa->childs[0].i_proposals,
                                   IKEV2_PROTOCOL_ESP);

          if (~0 != sel_p->tun_itf)
            {
              sa->is_tun_itf_set = 1;
              sa->tun_itf = sel_p->tun_itf;
            }
        }
    }
  else
    {
      ikev2_elog_uint (IKEV2_LOG_ERROR, "authentication failed, no matching "
                       "profile found! ispi %lx", sa->ispi);
      ikev2_set_state (sa, IKEV2_STATE_AUTH_FAILED);
    }
  vec_free (psk);
  vec_free (key_pad);
}


static void
ikev2_sa_auth_init (ikev2_sa_t * sa)
{
  ikev2_main_t *km = &ikev2_main;
  u8 *authmsg, *key_pad, *psk = 0, *auth = 0;
  ikev2_sa_transform_t *tr_prf;

  tr_prf =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_PRF);

  /* only shared key and rsa signature */
  if (!(sa->i_auth.method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC ||
        sa->i_auth.method == IKEV2_AUTH_METHOD_RSA_SIG))
    {
      ikev2_elog_uint (IKEV2_LOG_ERROR,
                       "unsupported authentication method %u",
                       sa->i_auth.method);
      ikev2_set_state (sa, IKEV2_STATE_AUTH_FAILED);
      return;
    }

  key_pad = format (0, "%s", IKEV2_KEY_PAD);
  authmsg = ikev2_sa_generate_authmsg (sa, 0);
  psk = ikev2_calc_prf (tr_prf, sa->i_auth.data, key_pad);
  auth = ikev2_calc_prf (tr_prf, psk, authmsg);


  if (sa->i_auth.method == IKEV2_AUTH_METHOD_SHARED_KEY_MIC)
    {
      sa->i_auth.data = ikev2_calc_prf (tr_prf, psk, authmsg);
      sa->i_auth.method = IKEV2_AUTH_METHOD_SHARED_KEY_MIC;
    }
  else if (sa->i_auth.method == IKEV2_AUTH_METHOD_RSA_SIG)
    {
      sa->i_auth.data = ikev2_calc_sign (km->pkey, authmsg);
      sa->i_auth.method = IKEV2_AUTH_METHOD_RSA_SIG;
    }

  vec_free (psk);
  vec_free (key_pad);
  vec_free (auth);
  vec_free (authmsg);
}

static u32
ikev2_mk_local_sa_id (u32 sai, u32 ci, u32 ti)
{
  return (0x80000000 | (ti << 24) | (sai << 12) | ci);
}

static u32
ikev2_mk_remote_sa_id (u32 sai, u32 ci, u32 ti)
{
  return (0xc0000000 | (ti << 24) | (sai << 12) | ci);
}

typedef struct
{
  u32 sw_if_index;
  u32 salt_local;
  u32 salt_remote;
  u32 local_sa_id;
  u32 remote_sa_id;
  ipsec_sa_flags_t flags;
  u32 local_spi;
  u32 remote_spi;
  ipsec_crypto_alg_t encr_type;
  ipsec_integ_alg_t integ_type;
  ip46_address_t local_ip;
  ip46_address_t remote_ip;
  ipsec_key_t loc_ckey, rem_ckey, loc_ikey, rem_ikey;
  u8 is_rekey;
  u32 old_remote_sa_id;
  u16 dst_port;
} ikev2_add_ipsec_tunnel_args_t;

static void
ikev2_add_tunnel_from_main (ikev2_add_ipsec_tunnel_args_t * a)
{
  ikev2_main_t *km = &ikev2_main;
  u32 sw_if_index;
  int rv = 0;

  if (~0 == a->sw_if_index)
    {
      /* no tunnel associated with the SA/profile - create a new one */
      rv = ipip_add_tunnel (IPIP_TRANSPORT_IP4, ~0,
                            &a->local_ip, &a->remote_ip, 0,
                            TUNNEL_ENCAP_DECAP_FLAG_NONE, IP_DSCP_CS0,
                            TUNNEL_MODE_P2P, &sw_if_index);

      if (rv == VNET_API_ERROR_IF_ALREADY_EXISTS)
        {
          if (hash_get (km->sw_if_indices, sw_if_index))
            /* interface is managed by IKE; proceed with updating SAs */
            rv = 0;
        }
      hash_set1 (km->sw_if_indices, sw_if_index);
    }
  else
    {
      sw_if_index = a->sw_if_index;
      vnet_sw_interface_admin_up (vnet_get_main (), sw_if_index);
    }

  if (rv)
    {
      ikev2_elog_peers (IKEV2_LOG_ERROR, "installing ipip tunnel failed! "
                        "loc:%d.%d.%d.%d rem:%d.%d.%d.%d",
                        a->local_ip.ip4.as_u32, a->remote_ip.ip4.as_u32);
      return;
    }

  u32 *sas_in = NULL;
  vec_add1 (sas_in, a->remote_sa_id);
  if (a->is_rekey)
    {
      ipsec_tun_protect_del (sw_if_index, NULL);

      /* replace local SA immediately */
      ipsec_sa_unlock_id (a->local_sa_id);

      /* keep the old sa */
      vec_add1 (sas_in, a->old_remote_sa_id);
    }

  rv |= ipsec_sa_add_and_lock (a->local_sa_id,
                               a->local_spi,
                               IPSEC_PROTOCOL_ESP, a->encr_type,
                               &a->loc_ckey, a->integ_type, &a->loc_ikey,
                               a->flags, 0, a->salt_local, &a->local_ip,
                               &a->remote_ip, NULL, a->dst_port, a->dst_port);
  rv |= ipsec_sa_add_and_lock (a->remote_sa_id, a->remote_spi,
                               IPSEC_PROTOCOL_ESP, a->encr_type, &a->rem_ckey,
                               a->integ_type, &a->rem_ikey,
                               (a->flags | IPSEC_SA_FLAG_IS_INBOUND), 0,
                               a->salt_remote, &a->remote_ip,
                               &a->local_ip, NULL, a->dst_port, a->dst_port);

  rv |= ipsec_tun_protect_update (sw_if_index, NULL, a->local_sa_id, sas_in);
}

static int
ikev2_create_tunnel_interface (vlib_main_t * vm,
                               u32 thread_index,
                               ikev2_sa_t * sa,
                               ikev2_child_sa_t * child, u32 sa_index,
                               u32 child_index, u8 is_rekey)
{
  ikev2_main_t *km = &ikev2_main;
  ipsec_crypto_alg_t encr_type;
  ipsec_integ_alg_t integ_type;
  ikev2_profile_t *p = 0;
  ikev2_sa_transform_t *tr;
  ikev2_sa_proposal_t *proposals;
  u8 is_aead = 0;
  ikev2_add_ipsec_tunnel_args_t a;

  clib_memset (&a, 0, sizeof (a));

  if (!child->r_proposals)
    {
      ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN);
      return 1;
    }

  if (sa->is_initiator)
    {
      ip46_address_set_ip4 (&a.local_ip, &sa->iaddr);
      ip46_address_set_ip4 (&a.remote_ip, &sa->raddr);
      proposals = child->i_proposals;
      a.local_spi = child->r_proposals[0].spi;
      a.remote_spi = child->i_proposals[0].spi;
    }
  else
    {
      ip46_address_set_ip4 (&a.local_ip, &sa->raddr);
      ip46_address_set_ip4 (&a.remote_ip, &sa->iaddr);
      proposals = child->r_proposals;
      a.local_spi = child->i_proposals[0].spi;
      a.remote_spi = child->r_proposals[0].spi;
    }

  a.flags = IPSEC_SA_FLAG_USE_ANTI_REPLAY;
  if (sa->udp_encap)
    {
      a.flags |= IPSEC_SA_FLAG_IS_TUNNEL;
      a.flags |= IPSEC_SA_FLAG_UDP_ENCAP;
    }
  a.is_rekey = is_rekey;

  tr = ikev2_sa_get_td_for_type (proposals, IKEV2_TRANSFORM_TYPE_ESN);
  if (tr && tr->esn_type)
    a.flags |= IPSEC_SA_FLAG_USE_ESN;

  tr = ikev2_sa_get_td_for_type (proposals, IKEV2_TRANSFORM_TYPE_ENCR);
  if (tr)
    {
      if (tr->encr_type == IKEV2_TRANSFORM_ENCR_TYPE_AES_CBC && tr->key_len)
        {
          switch (tr->key_len)
            {
            case 16:
              encr_type = IPSEC_CRYPTO_ALG_AES_CBC_128;
              break;
            case 24:
              encr_type = IPSEC_CRYPTO_ALG_AES_CBC_192;
              break;
            case 32:
              encr_type = IPSEC_CRYPTO_ALG_AES_CBC_256;
              break;
            default:
              ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN);
              return 1;
              break;
            }
        }
      else if (tr->encr_type == IKEV2_TRANSFORM_ENCR_TYPE_AES_GCM_16
               && tr->key_len)
        {
          switch (tr->key_len)
            {
            case 16:
              encr_type = IPSEC_CRYPTO_ALG_AES_GCM_128;
              break;
            case 24:
              encr_type = IPSEC_CRYPTO_ALG_AES_GCM_192;
              break;
            case 32:
              encr_type = IPSEC_CRYPTO_ALG_AES_GCM_256;
              break;
            default:
              ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN);
              return 1;
              break;
            }
          is_aead = 1;
        }
      else
        {
          ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN);
          return 1;
        }
    }
  else
    {
      ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN);
      return 1;
    }
  a.encr_type = encr_type;

  if (!is_aead)
    {
      tr = ikev2_sa_get_td_for_type (proposals, IKEV2_TRANSFORM_TYPE_INTEG);
      if (tr)
        {
          switch (tr->integ_type)
            {
            case IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA2_256_128:
              integ_type = IPSEC_INTEG_ALG_SHA_256_128;
              break;
            case IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA2_384_192:
              integ_type = IPSEC_INTEG_ALG_SHA_384_192;
              break;
            case IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA2_512_256:
              integ_type = IPSEC_INTEG_ALG_SHA_512_256;
              break;
            case IKEV2_TRANSFORM_INTEG_TYPE_AUTH_HMAC_SHA1_96:
              integ_type = IPSEC_INTEG_ALG_SHA1_96;
              break;
            default:
              ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN);
              return 1;
            }
        }
      else
        {
          ikev2_set_state (sa, IKEV2_STATE_NO_PROPOSAL_CHOSEN);
          return 1;
        }
    }
  else
    {
      integ_type = IPSEC_INTEG_ALG_NONE;
    }

  a.integ_type = integ_type;
  ikev2_calc_child_keys (sa, child);

  if (sa->is_initiator)
    {
      ipsec_mk_key (&a.loc_ikey, child->sk_ai, vec_len (child->sk_ai));
      ipsec_mk_key (&a.rem_ikey, child->sk_ar, vec_len (child->sk_ar));
      ipsec_mk_key (&a.loc_ckey, child->sk_ei, vec_len (child->sk_ei));
      ipsec_mk_key (&a.rem_ckey, child->sk_er, vec_len (child->sk_er));
      if (is_aead)
        {
          a.salt_remote = child->salt_er;
          a.salt_local = child->salt_ei;
        }
    }
  else
    {
      ipsec_mk_key (&a.loc_ikey, child->sk_ar, vec_len (child->sk_ar));
      ipsec_mk_key (&a.rem_ikey, child->sk_ai, vec_len (child->sk_ai));
      ipsec_mk_key (&a.loc_ckey, child->sk_er, vec_len (child->sk_er));
      ipsec_mk_key (&a.rem_ckey, child->sk_ei, vec_len (child->sk_ei));
      if (is_aead)
        {
          a.salt_remote = child->salt_ei;
          a.salt_local = child->salt_er;
        }
    }

  if (sa->is_profile_index_set)
    p = pool_elt_at_index (km->profiles, sa->profile_index);

  if (p && p->lifetime)
    {
      child->time_to_expiration = vlib_time_now (vm) + p->lifetime;
      if (p->lifetime_jitter)
        {
          // This is not much better than rand(3), which Coverity warns
          // is unsuitable for security applications; random_u32 is
          // however fast. If this perturbance to the expiration time
          // needs to use a better RNG then we may need to use something
          // like /dev/urandom which has significant overhead.
          u32 rnd = (u32) (vlib_time_now (vm) * 1e6);
          rnd = random_u32 (&rnd);

          child->time_to_expiration += 1 + (rnd % p->lifetime_jitter);
        }
    }

  if (thread_index & 0xffffffc0)
    ikev2_elog_error ("error: thread index exceeds max range 0x3f!");

  if (child_index & 0xfffff000 || sa_index & 0xfffff000)
    ikev2_elog_error ("error: sa/child index exceeds max range 0xfff!");

  child->local_sa_id =
    a.local_sa_id =
    ikev2_mk_local_sa_id (sa_index, child_index, thread_index);

  u32 remote_sa_id = ikev2_mk_remote_sa_id (sa_index, child_index,
                                            thread_index);

  if (is_rekey)
    {
      /* create a new remote SA ID to keep the old SA for a bit longer
       * so the peer has some time to swap their SAs */

      /* use most significat bit of child index part in id */
      u32 mask = 0x800;
      if (sa->current_remote_id_mask)
        {
          sa->old_remote_id = a.old_remote_sa_id = remote_sa_id | mask;
          sa->current_remote_id_mask = 0;
        }
      else
        {
          sa->old_remote_id = a.old_remote_sa_id = remote_sa_id;
          sa->current_remote_id_mask = mask;
          remote_sa_id |= mask;
        }
      sa->old_id_expiration = 3.0;
      sa->old_remote_id_present = 1;
    }

  child->remote_sa_id = a.remote_sa_id = remote_sa_id;

  a.sw_if_index = (sa->is_tun_itf_set ? sa->tun_itf : ~0);
  a.dst_port = sa->dst_port;

  vl_api_rpc_call_main_thread (ikev2_add_tunnel_from_main,
                               (u8 *) & a, sizeof (a));
  return 0;
}

typedef struct
{
  ip46_address_t local_ip;
  ip46_address_t remote_ip;
  u32 remote_sa_id;
  u32 local_sa_id;
  u32 sw_if_index;
} ikev2_del_ipsec_tunnel_args_t;

static_always_inline u32
ikev2_flip_alternate_sa_bit (u32 id)
{
  u32 mask = 0x800;
  if (mask & id)
    return id & ~mask;
  return id | mask;
}

static void
ikev2_del_tunnel_from_main (ikev2_del_ipsec_tunnel_args_t * a)
{
  ikev2_main_t *km = &ikev2_main;
  ipip_tunnel_t *ipip = NULL;
  u32 sw_if_index;

  if (~0 == a->sw_if_index)
    {
    /* *INDENT-OFF* */
    ipip_tunnel_key_t key = {
      .src = a->local_ip,
      .dst = a->remote_ip,
      .transport = IPIP_TRANSPORT_IP4,
      .fib_index = 0,
    };
    /* *INDENT-ON* */

      ipip = ipip_tunnel_db_find (&key);

      if (ipip)
        {
          sw_if_index = ipip->sw_if_index;
          hash_unset (km->sw_if_indices, ipip->sw_if_index);
        }
      else
        sw_if_index = ~0;
    }
  else
    {
      sw_if_index = a->sw_if_index;
      vnet_sw_interface_admin_down (vnet_get_main (), sw_if_index);
    }

  if (~0 != sw_if_index)
    ipsec_tun_protect_del (sw_if_index, NULL);

  ipsec_sa_unlock_id (a->remote_sa_id);
  ipsec_sa_unlock_id (a->local_sa_id);
  ipsec_sa_unlock_id (ikev2_flip_alternate_sa_bit (a->remote_sa_id));

  if (ipip)
    ipip_del_tunnel (ipip->sw_if_index);
}

static int
ikev2_delete_tunnel_interface (vnet_main_t * vnm, ikev2_sa_t * sa,
                               ikev2_child_sa_t * child)
{
  ikev2_del_ipsec_tunnel_args_t a;

  clib_memset (&a, 0, sizeof (a));

  if (sa->is_initiator)
    {
      ip46_address_set_ip4 (&a.local_ip, &sa->iaddr);
      ip46_address_set_ip4 (&a.remote_ip, &sa->raddr);
    }
  else
    {
      ip46_address_set_ip4 (&a.local_ip, &sa->raddr);
      ip46_address_set_ip4 (&a.remote_ip, &sa->iaddr);
    }

  a.remote_sa_id = child->remote_sa_id;
  a.local_sa_id = child->local_sa_id;
  a.sw_if_index = (sa->is_tun_itf_set ? sa->tun_itf : ~0);

  vl_api_rpc_call_main_thread (ikev2_del_tunnel_from_main, (u8 *) & a,
                               sizeof (a));
  return 0;
}

static u32
ikev2_generate_message (ikev2_sa_t * sa, ike_header_t * ike, void *user)
{
  v8 *integ = 0;
  ike_payload_header_t *ph;
  u16 plen;
  u32 tlen = 0;

  ikev2_sa_transform_t *tr_encr, *tr_integ;
  tr_encr =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_ENCR);
  tr_integ =
    ikev2_sa_get_td_for_type (sa->r_proposals, IKEV2_TRANSFORM_TYPE_INTEG);

  ikev2_payload_chain_t *chain = 0;
  ikev2_payload_new_chain (chain);

  if (ike->exchange == IKEV2_EXCHANGE_SA_INIT)
    {
      if (sa->r_proposals == 0)
        {
          ikev2_payload_add_notify (chain,
                                    IKEV2_NOTIFY_MSG_NO_PROPOSAL_CHOSEN, 0);
          ikev2_set_state (sa, IKEV2_STATE_NOTIFY_AND_DELETE);
        }
      else if (sa->dh_group == IKEV2_TRANSFORM_DH_TYPE_NONE)
        {
          u8 *data = vec_new (u8, 2);
          ikev2_sa_transform_t *tr_dh;
          tr_dh =
            ikev2_sa_get_td_for_type (sa->r_proposals,
                                      IKEV2_TRANSFORM_TYPE_DH);
          ASSERT (tr_dh && tr_dh->dh_type);

          data[0] = (tr_dh->dh_type >> 8) & 0xff;
          data[1] = (tr_dh->dh_type) & 0xff;

          ikev2_payload_add_notify (chain,
                                    IKEV2_NOTIFY_MSG_INVALID_KE_PAYLOAD,
                                    data);
          vec_free (data);
          ikev2_set_state (sa, IKEV2_STATE_NOTIFY_AND_DELETE);
        }
      else if (sa->state == IKEV2_STATE_NOTIFY_AND_DELETE)
        {
          u8 *data = vec_new (u8, 1);

          data[0] = sa->unsupported_cp;
          ikev2_payload_add_notify (chain,
                                    IKEV2_NOTIFY_MSG_UNSUPPORTED_CRITICAL_PAYLOAD,
                                    data);
          vec_free (data);
        }
      else
        {
          ike->rspi = clib_host_to_net_u64 (sa->rspi);
          ikev2_payload_add_sa (chain, sa->r_proposals);
          ikev2_payload_add_ke (chain, sa->dh_group, sa->r_dh_data);
          ikev2_payload_add_nonce (chain, sa->r_nonce);
        }
    }
  else if (ike->exchange == IKEV2_EXCHANGE_IKE_AUTH)
    {
      if (sa->state == IKEV2_STATE_AUTHENTICATED)
        {
          ikev2_payload_add_id (chain, &sa->r_id, IKEV2_PAYLOAD_IDR);
          ikev2_payload_add_auth (chain, &sa->r_auth);
          ikev2_payload_add_sa (chain, sa->childs[0].r_proposals);
          ikev2_payload_add_ts (chain, sa->childs[0].tsi, IKEV2_PAYLOAD_TSI);
          ikev2_payload_add_ts (chain, sa->childs[0].tsr, IKEV2_PAYLOAD_TSR);
        }
      else if (sa->state == IKEV2_STATE_AUTH_FAILED)
        {
          ikev2_payload_add_notify (chain,
                                    IKEV2_NOTIFY_MSG_AUTHENTICATION_FAILED,
                                    0);
          ikev2_set_state (sa, IKEV2_STATE_NOTIFY_AND_DELETE);
        }
      else if (sa->state == IKEV2_STATE_TS_UNACCEPTABLE)
        {
          ikev2_payload_add_notify (chain, IKEV2_NOTIFY_MSG_TS_UNACCEPTABLE,
                                    0);
          ikev2_payload_add_id (chain, &sa->r_id, IKEV2_PAYLOAD_IDR);
          ikev2_payload_add_auth (chain, &sa->r_auth);
        }
      else if (sa->state == IKEV2_STATE_NO_PROPOSAL_CHOSEN)
        {
          ikev2_payload_add_notify (chain,
                                    IKEV2_NOTIFY_MSG_NO_PROPOSAL_CHOSEN, 0);
          ikev2_payload_add_id (chain, &sa->r_id, IKEV2_PAYLOAD_IDR);
          ikev2_payload_add_auth (chain, &sa->r_auth);
          ikev2_payload_add_ts (chain, sa->childs[0].tsi, IKEV2_PAYLOAD_TSI);
          ikev2_payload_add_ts (chain, sa->childs[0].tsr, IKEV2_PAYLOAD_TSR);
        }
      else if (sa->state == IKEV2_STATE_NOTIFY_AND_DELETE)
        {
          u8 *data = vec_new (u8, 1);

          data[0] = sa->unsupported_cp;
          ikev2_payload_add_notify (chain,
                                    IKEV2_NOTIFY_MSG_UNSUPPORTED_CRITICAL_PAYLOAD,
                                    data);
          vec_free (data);
        }
      else if (sa->state == IKEV2_STATE_SA_INIT)
        {
          ikev2_payload_add_id (chain, &sa->i_id, IKEV2_PAYLOAD_IDI);
          ikev2_payload_add_auth (chain, &sa->i_auth);
          ikev2_payload_add_sa (chain, sa->childs[0].i_proposals);
          ikev2_payload_add_ts (chain, sa->childs[0].tsi, IKEV2_PAYLOAD_TSI);
          ikev2_payload_add_ts (chain, sa->childs[0].tsr, IKEV2_PAYLOAD_TSR);
          ikev2_payload_add_notify (chain, IKEV2_NOTIFY_MSG_INITIAL_CONTACT,
                                    0);
        }
      else
        {
          ikev2_set_state (sa, IKEV2_STATE_DELETED);
          goto done;
        }
    }
  else if (ike->exchange == IKEV2_EXCHANGE_INFORMATIONAL)
    {
      /* if pending delete */
      if (sa->del)
        {
          if (sa->del[0].protocol_id == IKEV2_PROTOCOL_IKE)
            {
              if (sa->is_initiator)
                ikev2_payload_add_delete (chain, sa->del);

              /* The response to a request that deletes the IKE SA is an empty
                 INFORMATIONAL response. */
              ikev2_set_state (sa, IKEV2_STATE_NOTIFY_AND_DELETE);
            }
          /* The response to a request that deletes ESP or AH SAs will contain
             delete payloads for the paired SAs going in the other direction. */
          else
            {
              ikev2_payload_add_delete (chain, sa->del);
            }
          vec_free (sa->del);
          sa->del = 0;
        }
      /* received N(AUTHENTICATION_FAILED) */
      else if (sa->state == IKEV2_STATE_AUTH_FAILED)
        {
          ikev2_set_state (sa, IKEV2_STATE_DELETED);
          goto done;
        }
      /* received unsupported critical payload */
      else if (sa->unsupported_cp)
        {
          u8 *data = vec_new (u8, 1);

          data[0] = sa->unsupported_cp;
          ikev2_payload_add_notify (chain,
                                    IKEV2_NOTIFY_MSG_UNSUPPORTED_CRITICAL_PAYLOAD,
                                    data);
          vec_free (data);
          sa->unsupported_cp = 0;
        }
      /* else send empty response */
    }
  else if (ike->exchange == IKEV2_EXCHANGE_CREATE_CHILD_SA)
    {
      if (sa->is_initiator)
        {

          ikev2_sa_proposal_t *proposals = (ikev2_sa_proposal_t *) user;
          ikev2_notify_t notify;
          u8 *data = vec_new (u8, 4);
          clib_memset (&notify, 0, sizeof (notify));
          notify.protocol_id = IKEV2_PROTOCOL_ESP;
          notify.spi = sa->childs[0].i_proposals->spi;
          *(u32 *) data = clib_host_to_net_u32 (notify.spi);

          ikev2_payload_add_sa (chain, proposals);
          ikev2_payload_add_nonce (chain, sa->i_nonce);
          ikev2_payload_add_ts (chain, sa->childs[0].tsi, IKEV2_PAYLOAD_TSI);
          ikev2_payload_add_ts (chain, sa->childs[0].tsr, IKEV2_PAYLOAD_TSR);
          ikev2_payload_add_notify_2 (chain, IKEV2_NOTIFY_MSG_REKEY_SA, data,
                                      &notify);

          vec_free (data);
        }
      else
        {
          if (sa->rekey)
            {
              ikev2_payload_add_sa (chain, sa->rekey[0].r_proposal);
              ikev2_payload_add_nonce (chain, sa->r_nonce);
              ikev2_payload_add_ts (chain, sa->rekey[0].tsi,
                                    IKEV2_PAYLOAD_TSI);
              ikev2_payload_add_ts (chain, sa->rekey[0].tsr,
                                    IKEV2_PAYLOAD_TSR);
              vec_del1 (sa->rekey, 0);
            }
          else if (sa->unsupported_cp)
            {
              u8 *data = vec_new (u8, 1);

              data[0] = sa->unsupported_cp;
              ikev2_payload_add_notify (chain,
                                        IKEV2_NOTIFY_MSG_UNSUPPORTED_CRITICAL_PAYLOAD,
                                        data);
              vec_free (data);
              sa->unsupported_cp = 0;
            }
          else
            {
              ikev2_payload_add_notify (chain,
                                        IKEV2_NOTIFY_MSG_NO_ADDITIONAL_SAS,
                                        0);
            }
        }
    }

  /* IKEv2 header */
  ike->version = IKE_VERSION_2;
  ike->nextpayload = IKEV2_PAYLOAD_SK;
  tlen = sizeof (*ike);
  if (sa->is_initiator)
    {
      ike->flags = IKEV2_HDR_FLAG_INITIATOR;
      sa->last_init_msg_id = clib_net_to_host_u32 (ike->msgid);
    }
  else
    {
      ike->flags = IKEV2_HDR_FLAG_RESPONSE;
    }


  if (ike->exchange == IKEV2_EXCHANGE_SA_INIT)
    {
      tlen += vec_len (chain->data);
      ike->nextpayload = chain->first_payload_type;
      ike->length = clib_host_to_net_u32 (tlen);
      clib_memcpy_fast (ike->payload, chain->data, vec_len (chain->data));

      /* store whole IKE payload - needed for PSK auth */
      vec_free (sa->last_sa_init_res_packet_data);
      vec_add (sa->last_sa_init_res_packet_data, ike, tlen);
    }
  else
    {

      ikev2_payload_chain_add_padding (chain, tr_encr->block_size);

      /* SK payload */
      plen = sizeof (*ph);
      ph = (ike_payload_header_t *) & ike->payload[0];
      ph->nextpayload = chain->first_payload_type;
      ph->flags = 0;
      int enc_len = ikev2_encrypt_data (sa, chain->data, ph->payload);
      plen += enc_len;

      /* add space for hmac */
      plen += tr_integ->key_trunc;
      tlen += plen;

      /* payload and total length */
      ph->length = clib_host_to_net_u16 (plen);
      ike->length = clib_host_to_net_u32 (tlen);

      /* calc integrity data for whole packet except hash itself */
      integ =
        ikev2_calc_integr (tr_integ, sa->is_initiator ? sa->sk_ai : sa->sk_ar,
                           (u8 *) ike, tlen - tr_integ->key_trunc);

      clib_memcpy_fast (ike->payload + tlen - tr_integ->key_trunc -
                        sizeof (*ike), integ, tr_integ->key_trunc);

      /* store whole IKE payload - needed for retransmit */
      vec_free (sa->last_res_packet_data);
      vec_add (sa->last_res_packet_data, ike, tlen);
    }

done:
  ikev2_payload_destroy_chain (chain);
  vec_free (integ);
  return tlen;
}

static int
ikev2_retransmit_sa_init (ike_header_t * ike,
                          ip4_address_t iaddr, ip4_address_t raddr)
{
  ikev2_main_t *km = &ikev2_main;
  ikev2_sa_t *sa;
  u32 thread_index = vlib_get_thread_index ();

  /* *INDENT-OFF* */
  pool_foreach (sa, km->per_thread_data[thread_index].sas, ({
    if (sa->ispi == clib_net_to_host_u64(ike->ispi) &&
        sa->iaddr.as_u32 == iaddr.as_u32 &&
        sa->raddr.as_u32 == raddr.as_u32)
      {
        int p = 0;
        u32 len = clib_net_to_host_u32(ike->length);
        u8 payload = ike->nextpayload;

        while (p < len && payload!= IKEV2_PAYLOAD_NONE) {
          ike_payload_header_t * ikep = (ike_payload_header_t *) &ike->payload[p];
          u32 plen = clib_net_to_host_u16(ikep->length);

          if (plen < sizeof(ike_payload_header_t))
            return -1;

          if (payload == IKEV2_PAYLOAD_NONCE)
            {
              if (!memcmp(sa->i_nonce, ikep->payload, plen - sizeof(*ikep)))
                {
                  /* req is retransmit */
                  if (sa->state == IKEV2_STATE_SA_INIT)
                    {
                      ike_header_t * tmp;
                      tmp = (ike_header_t*)sa->last_sa_init_res_packet_data;
                      ike->ispi = tmp->ispi;
                      ike->rspi = tmp->rspi;
                      ike->nextpayload = tmp->nextpayload;
                      ike->version = tmp->version;
                      ike->exchange = tmp->exchange;
                      ike->flags = tmp->flags;
                      ike->msgid = tmp->msgid;
                      ike->length = tmp->length;
                      clib_memcpy_fast(ike->payload, tmp->payload,
                             clib_net_to_host_u32(tmp->length) - sizeof(*ike));
                      ikev2_elog_uint_peers (IKEV2_LOG_DEBUG,
                                             "ispi %lx IKE_SA_INIT retransmit "
                                             "from %d.%d.%d.%d to %d.%d.%d.%d",
                                             ike->ispi,
                                             raddr.as_u32, iaddr.as_u32);
                      return 1;
                    }
                  /* else ignore req */
                  else
                    {
                      ikev2_elog_uint_peers (IKEV2_LOG_DEBUG,
                                             "ispi %lx IKE_SA_INIT ignore "
                                             "from %d.%d.%d.%d to %d.%d.%d.%d",
                                             ike->ispi,
                                             raddr.as_u32, iaddr.as_u32);
                      return -1;
                    }
                }
            }
          payload = ikep->nextpayload;
          p+=plen;
        }
      }
  }));
  /* *INDENT-ON* */

  /* req is not retransmit */
  return 0;
}

static int
ikev2_retransmit_resp (ikev2_sa_t * sa, ike_header_t * ike)
{
  u32 msg_id = clib_net_to_host_u32 (ike->msgid);

  /* new req */
  if (msg_id > sa->last_msg_id)
    {
      sa->last_msg_id = msg_id;
      return 0;
    }
  /* retransmitted req */
  else if (msg_id == sa->last_msg_id)
    {
      ike_header_t *tmp;
      tmp = (ike_header_t *) sa->last_res_packet_data;
      ike->ispi = tmp->ispi;
      ike->rspi = tmp->rspi;
      ike->nextpayload = tmp->nextpayload;
      ike->version = tmp->version;
      ike->exchange = tmp->exchange;
      ike->flags = tmp->flags;
      ike->msgid = tmp->msgid;
      ike->length = tmp->length;
      clib_memcpy_fast (ike->payload, tmp->payload,
                        clib_net_to_host_u32 (tmp->length) - sizeof (*ike));
      ikev2_elog_uint_peers (IKEV2_LOG_DEBUG, "IKE retransmit msgid %d",
                             msg_id, sa->raddr.as_u32, sa->iaddr.as_u32);
      return 1;
    }
  /* old req ignore */
  else
    {
      ikev2_elog_uint_peers (IKEV2_LOG_DEBUG, "IKE req ignore msgid %d",
                             msg_id, sa->raddr.as_u32, sa->iaddr.as_u32);
    }
  return -1;
}

static void
ikev2_init_sa (vlib_main_t * vm, ikev2_sa_t * sa)
{
  ikev2_main_t *km = &ikev2_main;
  sa->liveness_period_check = vlib_time_now (vm) + km->liveness_period;
}

static void
ikev2_del_sa_init_from_main (u64 * ispi)
{
  ikev2_main_t *km = &ikev2_main;
  uword *p = hash_get (km->sa_by_ispi, *ispi);
  if (p)
    {
      ikev2_sa_t *sai = pool_elt_at_index (km->sais, p[0]);
      hash_unset (km->sa_by_ispi, sai->ispi);
      ikev2_sa_free_all_vec (sai);
      pool_put (km->sais, sai);
    }
}

static void
ikev2_del_sa_init (u64 ispi)
{
  vl_api_rpc_call_main_thread (ikev2_del_sa_init_from_main, (u8 *) & ispi,
                               sizeof (ispi));
}

static uword
ikev2_node_fn (vlib_main_t * vm,
               vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  u32 n_left_from, *from, *to_next;
  ikev2_next_t next_index;
  ikev2_main_t *km = &ikev2_main;
  u32 thread_index = vlib_get_thread_index ();

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
        {
          u32 bi0;
          vlib_buffer_t *b0;
          u32 next0 = IKEV2_NEXT_ERROR_DROP;
          u32 sw_if_index0;
          ip4_header_t *ip40;
          udp_header_t *udp0;
          ike_header_t *ike0;
          ikev2_sa_t *sa0 = 0;
          ikev2_sa_t sa;        /* temporary store for SA */
          int len = 0;
          int r;

          /* speculatively enqueue b0 to the current next frame */
          bi0 = from[0];
          to_next[0] = bi0;
          from += 1;
          to_next += 1;
          n_left_from -= 1;
          n_left_to_next -= 1;

          b0 = vlib_get_buffer (vm, bi0);
          ike0 = vlib_buffer_get_current (b0);
          vlib_buffer_advance (b0, -sizeof (*udp0));
          udp0 = vlib_buffer_get_current (b0);
          vlib_buffer_advance (b0, -sizeof (*ip40));
          ip40 = vlib_buffer_get_current (b0);

          if (ike0->version != IKE_VERSION_2)
            {
              vlib_node_increment_counter (vm, ikev2_node.index,
                                           IKEV2_ERROR_NOT_IKEV2, 1);
              goto dispatch0;
            }

          if (ike0->exchange == IKEV2_EXCHANGE_SA_INIT)
            {
              sa0 = &sa;
              clib_memset (sa0, 0, sizeof (*sa0));

              if (ike0->flags & IKEV2_HDR_FLAG_INITIATOR)
                {
                  if (ike0->rspi == 0)
                    {
                      sa0->raddr.as_u32 = ip40->dst_address.as_u32;
                      sa0->iaddr.as_u32 = ip40->src_address.as_u32;

                      r = ikev2_retransmit_sa_init (ike0, sa0->iaddr,
                                                    sa0->raddr);
                      if (r == 1)
                        {
                          vlib_node_increment_counter (vm, ikev2_node.index,
                                                       IKEV2_ERROR_IKE_SA_INIT_RETRANSMIT,
                                                       1);
                          len = clib_net_to_host_u32 (ike0->length);
                          goto dispatch0;
                        }
                      else if (r == -1)
                        {
                          vlib_node_increment_counter (vm, ikev2_node.index,
                                                       IKEV2_ERROR_IKE_SA_INIT_IGNORE,
                                                       1);
                          goto dispatch0;
                        }

                      ikev2_process_sa_init_req (vm, sa0, ike0);

                      if (sa0->state == IKEV2_STATE_SA_INIT)
                        {
                          ikev2_sa_free_proposal_vector (&sa0->r_proposals);
                          sa0->r_proposals =
                            ikev2_select_proposal (sa0->i_proposals,
                                                   IKEV2_PROTOCOL_IKE);
                          ikev2_generate_sa_init_data (sa0);
                        }

                      if (sa0->state == IKEV2_STATE_SA_INIT
                          || sa0->state == IKEV2_STATE_NOTIFY_AND_DELETE)
                        {
                          len = ikev2_generate_message (sa0, ike0, 0);
                        }

                      if (sa0->state == IKEV2_STATE_SA_INIT)
                        {
                          /* add SA to the pool */
                          pool_get (km->per_thread_data[thread_index].sas,
                                    sa0);
                          clib_memcpy_fast (sa0, &sa, sizeof (*sa0));
                          ikev2_init_sa (vm, sa0);
                          hash_set (km->
                                    per_thread_data[thread_index].sa_by_rspi,
                                    sa0->rspi,
                                    sa0 -
                                    km->per_thread_data[thread_index].sas);
                        }
                      else
                        {
                          ikev2_sa_free_all_vec (sa0);
                        }
                    }
                }
              else              //received sa_init without initiator flag
                {
                  ikev2_process_sa_init_resp (vm, sa0, ike0);

                  if (sa0->state == IKEV2_STATE_SA_INIT)
                    {
                      ike0->exchange = IKEV2_EXCHANGE_IKE_AUTH;
                      uword *p = hash_get (km->sa_by_ispi, ike0->ispi);
                      if (p)
                        {
                          ikev2_sa_t *sai =
                            pool_elt_at_index (km->sais, p[0]);

                          if (clib_atomic_bool_cmp_and_swap
                              (&sai->init_response_received, 0, 1))
                            {
                              ikev2_complete_sa_data (sa0, sai);
                              ikev2_calc_keys (sa0);
                              ikev2_sa_auth_init (sa0);
                              len = ikev2_generate_message (sa0, ike0, 0);
                            }
                          else
                            {
                              /* we've already processed sa-init response */
                              sa0->state = IKEV2_STATE_UNKNOWN;
                            }
                        }
                    }

                  if (sa0->state == IKEV2_STATE_SA_INIT)
                    {
                      /* add SA to the pool */
                      pool_get (km->per_thread_data[thread_index].sas, sa0);
                      clib_memcpy_fast (sa0, &sa, sizeof (*sa0));
                      hash_set (km->per_thread_data[thread_index].sa_by_rspi,
                                sa0->rspi,
                                sa0 - km->per_thread_data[thread_index].sas);
                    }
                  else
                    {
                      ikev2_sa_free_all_vec (sa0);
                    }
                }
            }
          else if (ike0->exchange == IKEV2_EXCHANGE_IKE_AUTH)
            {
              uword *p;
              p = hash_get (km->per_thread_data[thread_index].sa_by_rspi,
                            clib_net_to_host_u64 (ike0->rspi));
              if (p)
                {
                  sa0 =
                    pool_elt_at_index (km->per_thread_data[thread_index].sas,
                                       p[0]);

                  r = ikev2_retransmit_resp (sa0, ike0);
                  if (r == 1)
                    {
                      vlib_node_increment_counter (vm, ikev2_node.index,
                                                   IKEV2_ERROR_IKE_REQ_RETRANSMIT,
                                                   1);
                      len = clib_net_to_host_u32 (ike0->length);
                      goto dispatch0;
                    }
                  else if (r == -1)
                    {
                      vlib_node_increment_counter (vm, ikev2_node.index,
                                                   IKEV2_ERROR_IKE_REQ_IGNORE,
                                                   1);
                      goto dispatch0;
                    }

                  ikev2_process_auth_req (vm, sa0, ike0);
                  ikev2_sa_auth (sa0);
                  if (sa0->state == IKEV2_STATE_AUTHENTICATED)
                    {
                      ikev2_initial_contact_cleanup (sa0);
                      ikev2_sa_match_ts (sa0);
                      if (sa0->state != IKEV2_STATE_TS_UNACCEPTABLE)
                        ikev2_create_tunnel_interface (vm, thread_index, sa0,
                                                       &sa0->childs[0],
                                                       p[0], 0, 0);
                    }

                  if (sa0->is_initiator)
                    {
                      ikev2_del_sa_init (ike0->ispi);
                    }
                  else
                    {
                      len = ikev2_generate_message (sa0, ike0, 0);
                    }
                }
            }
          else if (ike0->exchange == IKEV2_EXCHANGE_INFORMATIONAL)
            {
              uword *p;
              p = hash_get (km->per_thread_data[thread_index].sa_by_rspi,
                            clib_net_to_host_u64 (ike0->rspi));
              if (p)
                {
                  sa0 =
                    pool_elt_at_index (km->per_thread_data[thread_index].sas,
                                       p[0]);

                  r = ikev2_retransmit_resp (sa0, ike0);
                  if (r == 1)
                    {
                      vlib_node_increment_counter (vm, ikev2_node.index,
                                                   IKEV2_ERROR_IKE_REQ_RETRANSMIT,
                                                   1);
                      len = clib_net_to_host_u32 (ike0->length);
                      goto dispatch0;
                    }
                  else if (r == -1)
                    {
                      vlib_node_increment_counter (vm, ikev2_node.index,
                                                   IKEV2_ERROR_IKE_REQ_IGNORE,
                                                   1);
                      goto dispatch0;
                    }

                  ikev2_process_informational_req (vm, sa0, ike0);
                  if (sa0->del)
                    {
                      if (sa0->del[0].protocol_id != IKEV2_PROTOCOL_IKE)
                        {
                          ikev2_delete_t *d, *tmp, *resp = 0;
                          vec_foreach (d, sa0->del)
                          {
                            ikev2_child_sa_t *ch_sa;
                            ch_sa = ikev2_sa_get_child (sa0, d->spi,
                                                        d->protocol_id,
                                                        !sa0->is_initiator);
                            if (ch_sa)
                              {
                                ikev2_delete_tunnel_interface (km->vnet_main,
                                                               sa0, ch_sa);
                                if (!sa0->is_initiator)
                                  {
                                    vec_add2 (resp, tmp, 1);
                                    tmp->protocol_id = d->protocol_id;
                                    tmp->spi = ch_sa->r_proposals[0].spi;
                                  }
                                ikev2_sa_del_child_sa (sa0, ch_sa);
                              }
                          }
                          if (!sa0->is_initiator)
                            {
                              vec_free (sa0->del);
                              sa0->del = resp;
                            }
                        }
                    }
                  if (!(ike0->flags & IKEV2_HDR_FLAG_RESPONSE))
                    {
                      ike0->flags |= IKEV2_HDR_FLAG_RESPONSE;
                      len = ikev2_generate_message (sa0, ike0, 0);
                    }
                }
            }
          else if (ike0->exchange == IKEV2_EXCHANGE_CREATE_CHILD_SA)
            {
              uword *p;
              p = hash_get (km->per_thread_data[thread_index].sa_by_rspi,
                            clib_net_to_host_u64 (ike0->rspi));
              if (p)
                {
                  sa0 =
                    pool_elt_at_index (km->per_thread_data[thread_index].sas,
                                       p[0]);

                  r = ikev2_retransmit_resp (sa0, ike0);
                  if (r == 1)
                    {
                      vlib_node_increment_counter (vm, ikev2_node.index,
                                                   IKEV2_ERROR_IKE_REQ_RETRANSMIT,
                                                   1);
                      len = clib_net_to_host_u32 (ike0->length);
                      goto dispatch0;
                    }
                  else if (r == -1)
                    {
                      vlib_node_increment_counter (vm, ikev2_node.index,
                                                   IKEV2_ERROR_IKE_REQ_IGNORE,
                                                   1);
                      goto dispatch0;
                    }

                  ikev2_process_create_child_sa_req (vm, sa0, ike0);
                  if (sa0->rekey)
                    {
                      if (sa0->rekey[0].protocol_id != IKEV2_PROTOCOL_IKE)
                        {
                          if (sa0->childs)
                            vec_free (sa0->childs);
                          ikev2_child_sa_t *child;
                          vec_add2 (sa0->childs, child, 1);
                          child->r_proposals = sa0->rekey[0].r_proposal;
                          child->i_proposals = sa0->rekey[0].i_proposal;
                          child->tsi = sa0->rekey[0].tsi;
                          child->tsr = sa0->rekey[0].tsr;
                          ikev2_create_tunnel_interface (vm, thread_index,
                                                         sa0, child, p[0],
                                                         child - sa0->childs,
                                                         1);
                        }
                      if (sa0->is_initiator)
                        {
                          vec_del1 (sa0->rekey, 0);
                        }
                      else
                        {
                          len = ikev2_generate_message (sa0, ike0, 0);
                        }
                    }
                }
            }
          else
            {
              ikev2_elog_uint_peers (IKEV2_LOG_WARNING, "IKEv2 exchange %d "
                                     "received from %d.%d.%d.%d to %d.%d.%d.%d",
                                     ike0->exchange,
                                     ip40->src_address.as_u32,
                                     ip40->dst_address.as_u32);
            }

        dispatch0:
          /* if we are sending packet back, rewrite headers */
          if (len)
            {
              next0 = IKEV2_NEXT_IP4_LOOKUP;
              if (sa0->is_initiator)
                {
                  ip40->dst_address.as_u32 = sa0->raddr.as_u32;
                  ip40->src_address.as_u32 = sa0->iaddr.as_u32;
                }
              else
                {
                  ip40->dst_address.as_u32 = sa0->iaddr.as_u32;
                  ip40->src_address.as_u32 = sa0->raddr.as_u32;
                }
              udp0->length =
                clib_host_to_net_u16 (len + sizeof (udp_header_t));
              udp0->checksum = 0;
              b0->current_length =
                len + sizeof (ip4_header_t) + sizeof (udp_header_t);
              ip40->length = clib_host_to_net_u16 (b0->current_length);
              ip40->checksum = ip4_header_checksum (ip40);
            }
          /* delete sa */
          if (sa0 && (sa0->state == IKEV2_STATE_DELETED ||
                      sa0->state == IKEV2_STATE_NOTIFY_AND_DELETE))
            {
              ikev2_child_sa_t *c;

              vec_foreach (c, sa0->childs)
                ikev2_delete_tunnel_interface (km->vnet_main, sa0, c);

              ikev2_delete_sa (sa0);
            }
          sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];

          if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
                             && (b0->flags & VLIB_BUFFER_IS_TRACED)))
            {
              ikev2_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
              t->sw_if_index = sw_if_index0;
              t->next_index = next0;
            }

          vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
                                           n_left_to_next, bi0, next0);
        }

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  vlib_node_increment_counter (vm, ikev2_node.index,
                               IKEV2_ERROR_PROCESSED, frame->n_vectors);
  return frame->n_vectors;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ikev2_node,static) = {
  .function = ikev2_node_fn,
  .name = "ikev2",
  .vector_size = sizeof (u32),
  .format_trace = format_ikev2_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(ikev2_error_strings),
  .error_strings = ikev2_error_strings,

  .n_next_nodes = IKEV2_N_NEXT,

  .next_nodes = {
    [IKEV2_NEXT_IP4_LOOKUP] = "ip4-lookup",
        [IKEV2_NEXT_ERROR_DROP] = "error-drop",
  },
};
/* *INDENT-ON* */

// set ikev2 proposals when vpp is used as initiator
static clib_error_t *
ikev2_set_initiator_proposals (vlib_main_t * vm, ikev2_sa_t * sa,
                               ikev2_transforms_set * ts,
                               ikev2_sa_proposal_t ** proposals, int is_ike)
{
  clib_error_t *r;
  ikev2_main_t *km = &ikev2_main;
  ikev2_sa_proposal_t *proposal;
  vec_add2 (*proposals, proposal, 1);
  ikev2_sa_transform_t *td;
  int error;

  /* Encryption */
  error = 1;
  vec_foreach (td, km->supported_transforms)
  {
    if (td->type == IKEV2_TRANSFORM_TYPE_ENCR
        && td->encr_type == ts->crypto_alg
        && td->key_len == ts->crypto_key_size / 8)
      {
        u16 attr[2];
        attr[0] = clib_host_to_net_u16 (14 | (1 << 15));
        attr[1] = clib_host_to_net_u16 (td->key_len << 3);
        vec_add (td->attrs, (u8 *) attr, 4);
        vec_add1 (proposal->transforms, *td);
        td->attrs = 0;

        error = 0;
        break;
      }
  }
  if (error)
    {
      r = clib_error_return (0, "Unsupported algorithm");
      return r;
    }

  if (is_ike || IKEV2_TRANSFORM_ENCR_TYPE_AES_GCM_16 != ts->crypto_alg)
    {
      /* Integrity */
      error = 1;
      vec_foreach (td, km->supported_transforms)
      {
        if (td->type == IKEV2_TRANSFORM_TYPE_INTEG
            && td->integ_type == ts->integ_alg)
          {
            vec_add1 (proposal->transforms, *td);
            error = 0;
            break;
          }
      }
      if (error)
        {
          ikev2_elog_error
            ("Didn't find any supported algorithm for IKEV2_TRANSFORM_TYPE_INTEG");
          r = clib_error_return (0, "Unsupported algorithm");
          return r;
        }
    }

  /* PRF */
  if (is_ike)
    {
      error = 1;
      vec_foreach (td, km->supported_transforms)
      {
        if (td->type == IKEV2_TRANSFORM_TYPE_PRF
            && td->prf_type == IKEV2_TRANSFORM_PRF_TYPE_PRF_HMAC_SHA2_256)
          {
            vec_add1 (proposal->transforms, *td);
            error = 0;
            break;
          }
      }
      if (error)
        {
          r = clib_error_return (0, "Unsupported algorithm");
          return r;
        }
    }

  /* DH */
  if (is_ike || ts->dh_type != IKEV2_TRANSFORM_DH_TYPE_NONE)
    {
      error = 1;
      vec_foreach (td, km->supported_transforms)
      {
        if (td->type == IKEV2_TRANSFORM_TYPE_DH && td->dh_type == ts->dh_type)
          {
            vec_add1 (proposal->transforms, *td);
            if (is_ike)
              {
                sa->dh_group = td->dh_type;
              }
            error = 0;
            break;
          }
      }
      if (error)
        {
          r = clib_error_return (0, "Unsupported algorithm");
          return r;
        }
    }

  if (!is_ike)
    {
      error = 1;
      vec_foreach (td, km->supported_transforms)
      {
        if (td->type == IKEV2_TRANSFORM_TYPE_ESN)
          {
            vec_add1 (proposal->transforms, *td);
            error = 0;
            break;
          }
      }
      if (error)
        {
          r = clib_error_return (0, "Unsupported algorithm");
          return r;
        }
    }


  return 0;
}

static ikev2_profile_t *
ikev2_profile_index_by_name (u8 * name)
{
  ikev2_main_t *km = &ikev2_main;
  uword *p;

  p = mhash_get (&km->profile_index_by_name, name);
  if (!p)
    return 0;

  return pool_elt_at_index (km->profiles, p[0]);
}


static void
ikev2_send_ike (vlib_main_t * vm, ip4_address_t * src, ip4_address_t * dst,
                u32 bi0, u32 len)
{
  ip4_header_t *ip40;
  udp_header_t *udp0;
  vlib_buffer_t *b0;
  vlib_frame_t *f;
  u32 *to_next;

  b0 = vlib_get_buffer (vm, bi0);
  vlib_buffer_advance (b0, -sizeof (udp_header_t));
  udp0 = vlib_buffer_get_current (b0);
  vlib_buffer_advance (b0, -sizeof (ip4_header_t));
  ip40 = vlib_buffer_get_current (b0);


  ip40->ip_version_and_header_length = 0x45;
  ip40->tos = 0;
  ip40->fragment_id = 0;
  ip40->flags_and_fragment_offset = 0;
  ip40->ttl = 0xff;
  ip40->protocol = IP_PROTOCOL_UDP;
  ip40->dst_address.as_u32 = dst->as_u32;
  ip40->src_address.as_u32 = src->as_u32;
  udp0->dst_port = clib_host_to_net_u16 (500);
  udp0->src_port = clib_host_to_net_u16 (500);
  udp0->length = clib_host_to_net_u16 (len + sizeof (udp_header_t));
  udp0->checksum = 0;
  b0->current_length = len + sizeof (ip4_header_t) + sizeof (udp_header_t);
  ip40->length = clib_host_to_net_u16 (b0->current_length);
  ip40->checksum = ip4_header_checksum (ip40);


  /* send the request */
  f = vlib_get_frame_to_node (vm, ip4_lookup_node.index);
  to_next = vlib_frame_vector_args (f);
  to_next[0] = bi0;
  f->n_vectors = 1;
  vlib_put_frame_to_node (vm, ip4_lookup_node.index, f);

}

static u32
ikev2_get_new_ike_header_buff (vlib_main_t * vm, ike_header_t ** ike)
{
  u32 bi0;
  if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
    {
      *ike = 0;
      return 0;
    }
  vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
  *ike = vlib_buffer_get_current (b0);
  return bi0;
}

clib_error_t *
ikev2_set_local_key (vlib_main_t * vm, u8 * file)
{
  ikev2_main_t *km = &ikev2_main;

  km->pkey = ikev2_load_key_file (file);
  if (km->pkey == NULL)
    return clib_error_return (0, "load key '%s' failed", file);

  return 0;
}

static_always_inline vnet_api_error_t
ikev2_register_udp_port (ikev2_profile_t * p, u16 port)
{
  ikev2_main_t *km = &ikev2_main;
  udp_dst_port_info_t *pi;

  uword *v = hash_get (km->udp_ports, port);
  pi = udp_get_dst_port_info (&udp_main, port, UDP_IP4);

  if (v)
    {
      /* IKE already uses this port, only increment reference counter */
      ASSERT (pi);
      v[0]++;
    }
  else
    {
      if (pi)
        return VNET_API_ERROR_UDP_PORT_TAKEN;

      udp_register_dst_port (km->vlib_main, port,
                             ipsec4_tun_input_node.index, 1);
      hash_set (km->udp_ports, port, 1);
    }
  p->dst_port = port;
  return 0;
}

static_always_inline void
ikev2_unregister_udp_port (ikev2_profile_t * p)
{
  ikev2_main_t *km = &ikev2_main;
  uword *v;

  if (p->dst_port == IPSEC_UDP_PORT_NONE)
    return;

  v = hash_get (km->udp_ports, p->dst_port);
  if (!v)
    return;

  v[0]--;

  if (v[0] == 0)
    {
      udp_unregister_dst_port (km->vlib_main, p->dst_port, 1);
      hash_unset (km->udp_ports, p->dst_port);
    }

  p->dst_port = IPSEC_UDP_PORT_NONE;
}

clib_error_t *
ikev2_add_del_profile (vlib_main_t * vm, u8 * name, int is_add)
{
  ikev2_main_t *km = &ikev2_main;
  ikev2_profile_t *p;

  if (is_add)
    {
      if (ikev2_profile_index_by_name (name))
        return clib_error_return (0, "policy %v already exists", name);

      pool_get (km->profiles, p);
      clib_memset (p, 0, sizeof (*p));
      p->name = vec_dup (name);
      p->dst_port = IPSEC_UDP_PORT_NONE;
      p->responder.sw_if_index = ~0;
      p->tun_itf = ~0;
      uword index = p - km->profiles;
      mhash_set_mem (&km->profile_index_by_name, name, &index, 0);
    }
  else
    {
      p = ikev2_profile_index_by_name (name);
      if (!p)
        return clib_error_return (0, "policy %v does not exists", name);

      ikev2_unregister_udp_port (p);

      vec_free (p->name);
      pool_put (km->profiles, p);
      mhash_unset (&km->profile_index_by_name, name, 0);
    }
  return 0;
}

clib_error_t *
ikev2_set_profile_auth (vlib_main_t * vm, u8 * name, u8 auth_method,
                        u8 * auth_data, u8 data_hex_format)
{
  ikev2_profile_t *p;
  clib_error_t *r;

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }
  vec_free (p->auth.data);
  p->auth.method = auth_method;
  p->auth.data = vec_dup (auth_data);
  p->auth.hex = data_hex_format;

  if (auth_method == IKEV2_AUTH_METHOD_RSA_SIG)
    {
      vec_add1 (p->auth.data, 0);
      if (p->auth.key)
        EVP_PKEY_free (p->auth.key);
      p->auth.key = ikev2_load_cert_file (auth_data);
      if (p->auth.key == NULL)
        return clib_error_return (0, "load cert '%s' failed", auth_data);
    }

  return 0;
}

clib_error_t *
ikev2_set_profile_id (vlib_main_t * vm, u8 * name, u8 id_type, u8 * data,
                      int is_local)
{
  ikev2_profile_t *p;
  clib_error_t *r;

  if (id_type > IKEV2_ID_TYPE_ID_RFC822_ADDR
      && id_type < IKEV2_ID_TYPE_ID_KEY_ID)
    {
      r = clib_error_return (0, "unsupported identity type %U",
                             format_ikev2_id_type, id_type);
      return r;
    }

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  if (is_local)
    {
      vec_free (p->loc_id.data);
      p->loc_id.type = id_type;
      p->loc_id.data = vec_dup (data);
    }
  else
    {
      vec_free (p->rem_id.data);
      p->rem_id.type = id_type;
      p->rem_id.data = vec_dup (data);
    }

  return 0;
}

clib_error_t *
ikev2_set_profile_ts (vlib_main_t * vm, u8 * name, u8 protocol_id,
                      u16 start_port, u16 end_port, ip4_address_t start_addr,
                      ip4_address_t end_addr, int is_local)
{
  ikev2_profile_t *p;
  clib_error_t *r;

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  if (is_local)
    {
      p->loc_ts.start_addr.as_u32 = start_addr.as_u32;
      p->loc_ts.end_addr.as_u32 = end_addr.as_u32;
      p->loc_ts.start_port = start_port;
      p->loc_ts.end_port = end_port;
      p->loc_ts.protocol_id = protocol_id;
      p->loc_ts.ts_type = 7;
    }
  else
    {
      p->rem_ts.start_addr.as_u32 = start_addr.as_u32;
      p->rem_ts.end_addr.as_u32 = end_addr.as_u32;
      p->rem_ts.start_port = start_port;
      p->rem_ts.end_port = end_port;
      p->rem_ts.protocol_id = protocol_id;
      p->rem_ts.ts_type = 7;
    }

  return 0;
}


clib_error_t *
ikev2_set_profile_responder (vlib_main_t * vm, u8 * name,
                             u32 sw_if_index, ip4_address_t ip4)
{
  ikev2_profile_t *p;
  clib_error_t *r;

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  p->responder.sw_if_index = sw_if_index;
  p->responder.ip4 = ip4;

  return 0;
}

clib_error_t *
ikev2_set_profile_ike_transforms (vlib_main_t * vm, u8 * name,
                                  ikev2_transform_encr_type_t crypto_alg,
                                  ikev2_transform_integ_type_t integ_alg,
                                  ikev2_transform_dh_type_t dh_type,
                                  u32 crypto_key_size)
{
  ikev2_profile_t *p;
  clib_error_t *r;

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  p->ike_ts.crypto_alg = crypto_alg;
  p->ike_ts.integ_alg = integ_alg;
  p->ike_ts.dh_type = dh_type;
  p->ike_ts.crypto_key_size = crypto_key_size;
  return 0;
}

clib_error_t *
ikev2_set_profile_esp_transforms (vlib_main_t * vm, u8 * name,
                                  ikev2_transform_encr_type_t crypto_alg,
                                  ikev2_transform_integ_type_t integ_alg,
                                  ikev2_transform_dh_type_t dh_type,
                                  u32 crypto_key_size)
{
  ikev2_profile_t *p;
  clib_error_t *r;

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  p->esp_ts.crypto_alg = crypto_alg;
  p->esp_ts.integ_alg = integ_alg;
  p->esp_ts.dh_type = dh_type;
  p->esp_ts.crypto_key_size = crypto_key_size;
  return 0;
}

clib_error_t *
ikev2_set_profile_tunnel_interface (vlib_main_t * vm,
                                    u8 * name, u32 sw_if_index)
{
  ikev2_profile_t *p;
  clib_error_t *r;

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  p->tun_itf = sw_if_index;

  return 0;
}

vnet_api_error_t
ikev2_set_profile_ipsec_udp_port (vlib_main_t * vm, u8 * name, u16 port,
                                  u8 is_set)
{
  ikev2_profile_t *p = ikev2_profile_index_by_name (name);
  ikev2_main_t *km = &ikev2_main;
  vnet_api_error_t rv = 0;
  uword *v;

  if (!p)
    return VNET_API_ERROR_INVALID_VALUE;

  if (is_set)
    {
      if (p->dst_port != IPSEC_UDP_PORT_NONE)
        return VNET_API_ERROR_VALUE_EXIST;

      rv = ikev2_register_udp_port (p, port);
    }
  else
    {
      v = hash_get (km->udp_ports, port);
      if (!v)
        return VNET_API_ERROR_IKE_NO_PORT;

      if (p->dst_port == IPSEC_UDP_PORT_NONE)
        return VNET_API_ERROR_INVALID_VALUE;

      ikev2_unregister_udp_port (p);
    }
  return rv;
}

clib_error_t *
ikev2_set_profile_udp_encap (vlib_main_t * vm, u8 * name)
{
  ikev2_profile_t *p = ikev2_profile_index_by_name (name);
  clib_error_t *r;

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  p->udp_encap = 1;
  return 0;
}

clib_error_t *
ikev2_set_profile_sa_lifetime (vlib_main_t * vm, u8 * name,
                               u64 lifetime, u32 jitter, u32 handover,
                               u64 maxdata)
{
  ikev2_profile_t *p;
  clib_error_t *r;

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  p->lifetime = lifetime;
  p->lifetime_jitter = jitter;
  p->handover = handover;
  p->lifetime_maxdata = maxdata;
  return 0;
}

clib_error_t *
ikev2_initiate_sa_init (vlib_main_t * vm, u8 * name)
{
  ikev2_profile_t *p;
  clib_error_t *r;
  ip4_main_t *im = &ip4_main;
  ikev2_main_t *km = &ikev2_main;

  p = ikev2_profile_index_by_name (name);

  if (!p)
    {
      r = clib_error_return (0, "unknown profile %v", name);
      return r;
    }

  if (p->responder.sw_if_index == ~0 || p->responder.ip4.data_u32 == 0)
    {
      r = clib_error_return (0, "responder not set for profile %v", name);
      return r;
    }


  /* Create the Initiator Request */
  {
    ike_header_t *ike0;
    u32 bi0 = 0;
    ip_lookup_main_t *lm = &im->lookup_main;
    u32 if_add_index0;
    int len = sizeof (ike_header_t);

    /* Get own iface IP */
    if_add_index0 =
      lm->if_address_pool_index_by_sw_if_index[p->responder.sw_if_index];
    ip_interface_address_t *if_add =
      pool_elt_at_index (lm->if_address_pool, if_add_index0);
    ip4_address_t *if_ip = ip_interface_address_get_address (lm, if_add);

    bi0 = ikev2_get_new_ike_header_buff (vm, &ike0);

    /* Prepare the SA and the IKE payload */
    ikev2_sa_t sa;
    clib_memset (&sa, 0, sizeof (ikev2_sa_t));
    ikev2_payload_chain_t *chain = 0;
    ikev2_payload_new_chain (chain);

    /* Build the IKE proposal payload */
    ikev2_sa_proposal_t *proposals = 0;
    ikev2_set_initiator_proposals (vm, &sa, &p->ike_ts, &proposals, 1);
    proposals[0].proposal_num = 1;
    proposals[0].protocol_id = IKEV2_PROTOCOL_IKE;

    /* Add and then cleanup proposal data */
    ikev2_payload_add_sa (chain, proposals);
    ikev2_sa_free_proposal_vector (&proposals);

    sa.is_initiator = 1;
    sa.profile_index = p - km->profiles;
    sa.is_profile_index_set = 1;
    sa.state = IKEV2_STATE_SA_INIT;
    sa.tun_itf = p->tun_itf;
    sa.udp_encap = p->udp_encap;
    sa.dst_port = p->dst_port;
    sa.is_tun_itf_set = 1;
    sa.initial_contact = 1;
    ikev2_generate_sa_init_data (&sa);
    ikev2_payload_add_ke (chain, sa.dh_group, sa.i_dh_data);
    ikev2_payload_add_nonce (chain, sa.i_nonce);

    /* Build the child SA proposal */
    vec_resize (sa.childs, 1);
    ikev2_set_initiator_proposals (vm, &sa, &p->esp_ts,
                                   &sa.childs[0].i_proposals, 0);
    sa.childs[0].i_proposals[0].proposal_num = 1;
    sa.childs[0].i_proposals[0].protocol_id = IKEV2_PROTOCOL_ESP;
    RAND_bytes ((u8 *) & sa.childs[0].i_proposals[0].spi,
                sizeof (sa.childs[0].i_proposals[0].spi));



    /* Add NAT detection notification messages (mandatory) */
    u8 nat_detection_source[8 + 8 + 4 + 2];
    u8 *nat_detection_sha1 = vec_new (u8, 20);

    u64 tmpspi = clib_host_to_net_u64 (sa.ispi);
    clib_memcpy_fast (&nat_detection_source[0], &tmpspi, sizeof (tmpspi));
    tmpspi = clib_host_to_net_u64 (sa.rspi);
    clib_memcpy_fast (&nat_detection_source[8], &tmpspi, sizeof (tmpspi));
    u16 tmpport = clib_host_to_net_u16 (500);
    clib_memcpy_fast (&nat_detection_source[8 + 8 + 4], &tmpport,
                      sizeof (tmpport));
    u32 tmpip = clib_host_to_net_u32 (if_ip->as_u32);
    clib_memcpy_fast (&nat_detection_source[8 + 8], &tmpip, sizeof (tmpip));
    SHA1 (nat_detection_source, sizeof (nat_detection_source),
          nat_detection_sha1);
    ikev2_payload_add_notify (chain, IKEV2_NOTIFY_MSG_NAT_DETECTION_SOURCE_IP,
                              nat_detection_sha1);
    tmpip = clib_host_to_net_u32 (p->responder.ip4.as_u32);
    clib_memcpy_fast (&nat_detection_source[8 + 8], &tmpip, sizeof (tmpip));
    SHA1 (nat_detection_source, sizeof (nat_detection_source),
          nat_detection_sha1);
    ikev2_payload_add_notify (chain,
                              IKEV2_NOTIFY_MSG_NAT_DETECTION_DESTINATION_IP,
                              nat_detection_sha1);
    vec_free (nat_detection_sha1);

    u8 *sig_hash_algo = vec_new (u8, 8);
    u64 tmpsig = clib_host_to_net_u64 (0x0001000200030004);
    clib_memcpy_fast (sig_hash_algo, &tmpsig, sizeof (tmpsig));
    ikev2_payload_add_notify (chain,
                              IKEV2_NOTIFY_MSG_SIGNATURE_HASH_ALGORITHMS,
                              sig_hash_algo);
    vec_free (sig_hash_algo);


    /* Buffer update and boilerplate */
    len += vec_len (chain->data);
    ike0->nextpayload = chain->first_payload_type;
    ike0->length = clib_host_to_net_u32 (len);
    clib_memcpy_fast (ike0->payload, chain->data, vec_len (chain->data));
    ikev2_payload_destroy_chain (chain);

    ike0->version = IKE_VERSION_2;
    ike0->flags = IKEV2_HDR_FLAG_INITIATOR;
    ike0->exchange = IKEV2_EXCHANGE_SA_INIT;
    ike0->ispi = sa.ispi;
    ike0->rspi = 0;
    ike0->msgid = 0;

    /* store whole IKE payload - needed for PSK auth */
    vec_free (sa.last_sa_init_req_packet_data);
    vec_add (sa.last_sa_init_req_packet_data, ike0, len);

    /* add data to the SA then add it to the pool */
    sa.iaddr.as_u32 = if_ip->as_u32;
    sa.raddr.as_u32 = p->responder.ip4.as_u32;
    sa.i_id.type = p->loc_id.type;
    sa.i_id.data = vec_dup (p->loc_id.data);
    sa.i_auth.method = p->auth.method;
    sa.i_auth.hex = p->auth.hex;
    sa.i_auth.data = vec_dup (p->auth.data);
    vec_add (sa.childs[0].tsi, &p->loc_ts, 1);
    vec_add (sa.childs[0].tsr, &p->rem_ts, 1);

    ikev2_initial_contact_cleanup (&sa);

    /* add SA to the pool */
    ikev2_sa_t *sa0 = 0;
    pool_get (km->sais, sa0);
    clib_memcpy_fast (sa0, &sa, sizeof (*sa0));
    hash_set (km->sa_by_ispi, sa0->ispi, sa0 - km->sais);

    ikev2_send_ike (vm, if_ip, &p->responder.ip4, bi0, len);

    ikev2_elog_exchange ("ispi %lx rspi %lx IKEV2_EXCHANGE_SA_INIT sent to "
                         "%d.%d.%d.%d", clib_host_to_net_u64 (sa0->ispi), 0,
                         p->responder.ip4.as_u32);
  }

  return 0;
}

static void
ikev2_delete_child_sa_internal (vlib_main_t * vm, ikev2_sa_t * sa,
                                ikev2_child_sa_t * csa)
{
  /* Create the Initiator notification for child SA removal */
  ikev2_main_t *km = &ikev2_main;
  ike_header_t *ike0;
  u32 bi0 = 0;
  int len;

  bi0 = ikev2_get_new_ike_header_buff (vm, &ike0);


  ike0->exchange = IKEV2_EXCHANGE_INFORMATIONAL;
  ike0->ispi = clib_host_to_net_u64 (sa->ispi);
  ike0->rspi = clib_host_to_net_u64 (sa->rspi);
  vec_resize (sa->del, 1);
  sa->del->protocol_id = IKEV2_PROTOCOL_ESP;
  sa->del->spi = csa->i_proposals->spi;
  ike0->msgid = clib_host_to_net_u32 (sa->last_init_msg_id + 1);
  sa->last_init_msg_id = clib_net_to_host_u32 (ike0->msgid);
  len = ikev2_generate_message (sa, ike0, 0);

  ikev2_send_ike (vm, &sa->iaddr, &sa->raddr, bi0, len);

  /* delete local child SA */
  ikev2_delete_tunnel_interface (km->vnet_main, sa, csa);
  ikev2_sa_del_child_sa (sa, csa);
}

clib_error_t *
ikev2_initiate_delete_child_sa (vlib_main_t * vm, u32 ispi)
{
  clib_error_t *r;
  ikev2_main_t *km = &ikev2_main;
  ikev2_main_per_thread_data_t *tkm;
  ikev2_sa_t *fsa = 0;
  ikev2_child_sa_t *fchild = 0;

  /* Search for the child SA */
  vec_foreach (tkm, km->per_thread_data)
  {
    ikev2_sa_t *sa;
    if (fchild)
      break;
    /* *INDENT-OFF* */
    pool_foreach (sa, tkm->sas, ({
      fchild = ikev2_sa_get_child(sa, ispi, IKEV2_PROTOCOL_ESP, 1);
      if (fchild)
        {
          fsa = sa;
          break;
        }
    }));
    /* *INDENT-ON* */
  }

  if (!fchild || !fsa)
    {
      r = clib_error_return (0, "Child SA not found");
      return r;
    }
  else
    {
      ikev2_delete_child_sa_internal (vm, fsa, fchild);
    }

  return 0;
}

clib_error_t *
ikev2_initiate_delete_ike_sa (vlib_main_t * vm, u64 ispi)
{
  clib_error_t *r;
  ikev2_main_t *km = &ikev2_main;
  ikev2_main_per_thread_data_t *tkm;
  ikev2_sa_t *fsa = 0;
  ikev2_main_per_thread_data_t *ftkm = 0;

  /* Search for the IKE SA */
  vec_foreach (tkm, km->per_thread_data)
  {
    ikev2_sa_t *sa;
    if (fsa)
      break;
    /* *INDENT-OFF* */
    pool_foreach (sa, tkm->sas, ({
      if (sa->ispi == ispi)
        {
          fsa = sa;
          ftkm = tkm;
          break;
        }
    }));
    /* *INDENT-ON* */
  }

  if (!fsa)
    {
      r = clib_error_return (0, "IKE SA not found");
      return r;
    }


  /* Create the Initiator notification for IKE SA removal */
  {
    ike_header_t *ike0;
    u32 bi0 = 0;
    int len;

    bi0 = ikev2_get_new_ike_header_buff (vm, &ike0);


    ike0->exchange = IKEV2_EXCHANGE_INFORMATIONAL;
    ike0->ispi = clib_host_to_net_u64 (fsa->ispi);
    ike0->rspi = clib_host_to_net_u64 (fsa->rspi);
    vec_resize (fsa->del, 1);
    fsa->del->protocol_id = IKEV2_PROTOCOL_IKE;
    fsa->del->spi = ispi;
    ike0->msgid = clib_host_to_net_u32 (fsa->last_init_msg_id + 1);
    fsa->last_init_msg_id = clib_net_to_host_u32 (ike0->msgid);
    len = ikev2_generate_message (fsa, ike0, 0);

    ikev2_send_ike (vm, &fsa->iaddr, &fsa->raddr, bi0, len);
  }


  /* delete local SA */
  ikev2_child_sa_t *c;
  vec_foreach (c, fsa->childs)
  {
    ikev2_delete_tunnel_interface (km->vnet_main, fsa, c);
    ikev2_sa_del_child_sa (fsa, c);
  }
  ikev2_sa_free_all_vec (fsa);
  uword *p = hash_get (ftkm->sa_by_rspi, fsa->rspi);
  if (p)
    {
      hash_unset (ftkm->sa_by_rspi, fsa->rspi);
      pool_put (ftkm->sas, fsa);
    }


  return 0;
}

static void
ikev2_rekey_child_sa_internal (vlib_main_t * vm, ikev2_sa_t * sa,
                               ikev2_child_sa_t * csa)
{
  /* Create the Initiator request for create child SA */
  ike_header_t *ike0;
  u32 bi0 = 0;
  int len;


  bi0 = ikev2_get_new_ike_header_buff (vm, &ike0);


  ike0->version = IKE_VERSION_2;
  ike0->flags = IKEV2_HDR_FLAG_INITIATOR;
  ike0->exchange = IKEV2_EXCHANGE_CREATE_CHILD_SA;
  ike0->ispi = clib_host_to_net_u64 (sa->ispi);
  ike0->rspi = clib_host_to_net_u64 (sa->rspi);
  ike0->msgid = clib_host_to_net_u32 (sa->last_init_msg_id + 1);
  sa->last_init_msg_id = clib_net_to_host_u32 (ike0->msgid);

  ikev2_rekey_t *rekey;
  vec_add2 (sa->rekey, rekey, 1);
  ikev2_sa_proposal_t *proposals = vec_dup (csa->i_proposals);

  /*need new ispi */
  RAND_bytes ((u8 *) & proposals[0].spi, sizeof (proposals[0].spi));
  rekey->spi = proposals[0].spi;
  rekey->ispi = csa->i_proposals->spi;
  len = ikev2_generate_message (sa, ike0, proposals);
  ikev2_send_ike (vm, &sa->iaddr, &sa->raddr, bi0, len);
  vec_free (proposals);
}

clib_error_t *
ikev2_initiate_rekey_child_sa (vlib_main_t * vm, u32 ispi)
{
  clib_error_t *r;
  ikev2_main_t *km = &ikev2_main;
  ikev2_main_per_thread_data_t *tkm;
  ikev2_sa_t *fsa = 0;
  ikev2_child_sa_t *fchild = 0;

  /* Search for the child SA */
  vec_foreach (tkm, km->per_thread_data)
  {
    ikev2_sa_t *sa;
    if (fchild)
      break;
    /* *INDENT-OFF* */
    pool_foreach (sa, tkm->sas, ({
      fchild = ikev2_sa_get_child(sa, ispi, IKEV2_PROTOCOL_ESP, 1);
      if (fchild)
        {
          fsa = sa;
          break;
        }
    }));
    /* *INDENT-ON* */
  }

  if (!fchild || !fsa)
    {
      r = clib_error_return (0, "Child SA not found");
      return r;
    }
  else
    {
      ikev2_rekey_child_sa_internal (vm, fsa, fchild);
    }

  return 0;
}

clib_error_t *
ikev2_init (vlib_main_t * vm)
{
  ikev2_main_t *km = &ikev2_main;
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  int thread_id;

  clib_memset (km, 0, sizeof (ikev2_main_t));
  km->vnet_main = vnet_get_main ();
  km->vlib_main = vm;

  km->liveness_period = IKEV2_LIVENESS_PERIOD_CHECK;
  km->liveness_max_retries = IKEV2_LIVENESS_RETRIES;
  ikev2_crypto_init (km);

  mhash_init_vec_string (&km->profile_index_by_name, sizeof (uword));

  vec_validate_aligned (km->per_thread_data, tm->n_vlib_mains - 1,
                        CLIB_CACHE_LINE_BYTES);
  for (thread_id = 0; thread_id < tm->n_vlib_mains - 1; thread_id++)
    {
      km->per_thread_data[thread_id].sa_by_rspi =
        hash_create (0, sizeof (uword));
    }

  km->sa_by_ispi = hash_create (0, sizeof (uword));
  km->sw_if_indices = hash_create (0, 0);
  km->udp_ports = hash_create (0, sizeof (uword));

  udp_register_dst_port (vm, 500, ikev2_node.index, 1);

  ikev2_cli_reference ();

  km->log_level = IKEV2_LOG_ERROR;
  km->log_class = vlib_log_register_class ("ikev2", 0);
  return 0;
}

/* *INDENT-OFF* */
VLIB_INIT_FUNCTION (ikev2_init) =
{
  .runs_after = VLIB_INITS("ipsec_init"),
};
/* *INDENT-ON* */

static u8
ikev2_mngr_process_child_sa (ikev2_sa_t * sa, ikev2_child_sa_t * csa,
                             u8 del_old_ids)
{
  ikev2_main_t *km = &ikev2_main;
  ikev2_profile_t *p = 0;
  vlib_main_t *vm = km->vlib_main;
  f64 now = vlib_time_now (vm);
  u8 res = 0;

  if (sa->is_profile_index_set)
    p = pool_elt_at_index (km->profiles, sa->profile_index);

  if (sa->is_initiator && p && csa->time_to_expiration
      && now > csa->time_to_expiration)
    {
      if (!csa->is_expired || csa->rekey_retries > 0)
        {
          ikev2_rekey_child_sa_internal (vm, sa, csa);
          csa->time_to_expiration = now + p->handover;
          csa->is_expired = 1;
          if (csa->rekey_retries == 0)
            {
              csa->rekey_retries = 5;
            }
          else if (csa->rekey_retries > 0)
            {
              csa->rekey_retries--;
              ikev2_log_debug ("Rekeying Child SA 0x%x, retries left %d",
                               csa->i_proposals->spi, csa->rekey_retries);
              if (csa->rekey_retries == 0)
                {
                  csa->rekey_retries = -1;
                }
            }
          res |= 1;
        }
      else
        {
          csa->time_to_expiration = 0;
          ikev2_delete_child_sa_internal (vm, sa, csa);
          res |= 1;
        }
    }

  if (del_old_ids)
    {
      ipip_tunnel_t *ipip = NULL;
      u32 sw_if_index = sa->is_tun_itf_set ? sa->tun_itf : ~0;
      if (~0 == sw_if_index)
        {
          ip46_address_t local_ip;
          ip46_address_t remote_ip;
          if (sa->is_initiator)
            {
              ip46_address_set_ip4 (&local_ip, &sa->iaddr);
              ip46_address_set_ip4 (&remote_ip, &sa->raddr);
            }
          else
            {
              ip46_address_set_ip4 (&local_ip, &sa->raddr);
              ip46_address_set_ip4 (&remote_ip, &sa->iaddr);
            }

       /* *INDENT-OFF* */
       ipip_tunnel_key_t key = {
         .src = local_ip,
         .dst = remote_ip,
         .transport = IPIP_TRANSPORT_IP4,
         .fib_index = 0,
       };
       /* *INDENT-ON* */

          ipip = ipip_tunnel_db_find (&key);

          if (ipip)
            sw_if_index = ipip->sw_if_index;
          else
            return res;
        }

      u32 *sas_in = NULL;
      vec_add1 (sas_in, csa->remote_sa_id);
      ipsec_tun_protect_update (sw_if_index, NULL, csa->local_sa_id, sas_in);
      ipsec_sa_unlock_id (ikev2_flip_alternate_sa_bit (csa->remote_sa_id));
    }

  return res;
}

int
ikev2_set_log_level (ikev2_log_level_t log_level)
{
  ikev2_main_t *km = &ikev2_main;

  if (log_level >= IKEV2_LOG_MAX)
    {
      ikev2_log_error ("unknown logging level %d", log_level);
      return -1;
    }

  km->log_level = log_level;
  return 0;
}

clib_error_t *
ikev2_set_liveness_params (u32 period, u32 max_retries)
{
  ikev2_main_t *km = &ikev2_main;

  if (period == 0 || max_retries == 0)
    return clib_error_return (0, "invalid args");

  km->liveness_period = period;
  km->liveness_max_retries = max_retries;
  return 0;
}

static void
ikev2_mngr_process_ipsec_sa (ipsec_sa_t * ipsec_sa)
{
  ikev2_main_t *km = &ikev2_main;
  vlib_main_t *vm = km->vlib_main;
  ikev2_main_per_thread_data_t *tkm;
  ikev2_sa_t *fsa = 0;
  ikev2_profile_t *p = 0;
  ikev2_child_sa_t *fchild = 0;
  f64 now = vlib_time_now (vm);
  vlib_counter_t counts;

  /* Search for the SA and child SA */
  vec_foreach (tkm, km->per_thread_data)
  {
    ikev2_sa_t *sa;
    if (fchild)
      break;
    /* *INDENT-OFF* */
    pool_foreach (sa, tkm->sas, ({
      fchild = ikev2_sa_get_child(sa, ipsec_sa->spi, IKEV2_PROTOCOL_ESP, 1);
      if (fchild)
        {
          fsa = sa;
          break;
        }
    }));
    /* *INDENT-ON* */
  }
  vlib_get_combined_counter (&ipsec_sa_counters,
                             ipsec_sa->stat_index, &counts);

  if (fsa && fsa->is_profile_index_set)
    p = pool_elt_at_index (km->profiles, fsa->profile_index);

  if (fchild && p && p->lifetime_maxdata)
    {
      if (!fchild->is_expired && counts.bytes > p->lifetime_maxdata)
        {
          fchild->time_to_expiration = now;
        }
    }
}

static void
ikev2_process_pending_sa_init (ikev2_main_t * km)
{
  u32 sai;
  u64 ispi;
  ikev2_sa_t *sa;

  /* *INDENT-OFF* */
  hash_foreach (ispi, sai, km->sa_by_ispi,
  ({
    sa = pool_elt_at_index (km->sais, sai);
    if (sa->init_response_received)
      continue;

    u32 bi0;
    if (vlib_buffer_alloc (km->vlib_main, &bi0, 1) != 1)
      return;

    vlib_buffer_t * b = vlib_get_buffer (km->vlib_main, bi0);
    clib_memcpy_fast (vlib_buffer_get_current (b),
        sa->last_sa_init_req_packet_data,
        vec_len (sa->last_sa_init_req_packet_data));
    ikev2_send_ike (km->vlib_main, &sa->iaddr, &sa->raddr, bi0,
        vec_len (sa->last_sa_init_req_packet_data));
  }));
  /* *INDENT-ON* */
}

static vlib_node_registration_t ikev2_mngr_process_node;

static void
ikev2_send_informational_request (ikev2_sa_t * sa)
{
  ikev2_main_t *km = &ikev2_main;
  ip4_address_t *src, *dst;
  ike_header_t *ike0;
  u32 bi0 = 0;
  int len;

  bi0 = ikev2_get_new_ike_header_buff (km->vlib_main, &ike0);

  ike0->exchange = IKEV2_EXCHANGE_INFORMATIONAL;
  ike0->ispi = clib_host_to_net_u64 (sa->ispi);
  ike0->rspi = clib_host_to_net_u64 (sa->rspi);
  ike0->msgid = clib_host_to_net_u32 (sa->last_init_msg_id + 1);
  sa->last_init_msg_id = clib_net_to_host_u32 (ike0->msgid);
  len = ikev2_generate_message (sa, ike0, 0);

  if (sa->is_initiator)
    {
      src = &sa->iaddr;
      dst = &sa->raddr;
    }
  else
    {

      dst = &sa->iaddr;
      src = &sa->raddr;
    }

  ikev2_send_ike (km->vlib_main, src, dst, bi0, len);
}

static_always_inline int
ikev2_mngr_process_responder_sas (ikev2_sa_t * sa)
{
  ikev2_main_t *km = &ikev2_main;
  vlib_main_t *vm = km->vlib_main;

  if (!sa->sk_ai || !sa->sk_ar)
    return 0;

  if (sa->liveness_retries >= km->liveness_max_retries)
    return 1;

  f64 now = vlib_time_now (vm);

  if (sa->liveness_period_check < now)
    {
      sa->liveness_retries++;
      sa->liveness_period_check = now + km->liveness_period;
      ikev2_send_informational_request (sa);
    }
  return 0;
}

static uword
ikev2_mngr_process_fn (vlib_main_t * vm, vlib_node_runtime_t * rt,
                       vlib_frame_t * f)
{
  ikev2_main_t *km = &ikev2_main;
  ipsec_main_t *im = &ipsec_main;
  ikev2_profile_t *p;
  ikev2_child_sa_t *c;
  u32 *sai;

  while (1)
    {
      u8 req_sent = 0;
      vlib_process_wait_for_event_or_clock (vm, 1);
      vlib_process_get_events (vm, NULL);

      /* process ike child sas */
      ikev2_main_per_thread_data_t *tkm;
      vec_foreach (tkm, km->per_thread_data)
      {
        ikev2_sa_t *sa;
        u32 *to_be_deleted = 0;

        /* *INDENT-OFF* */
        pool_foreach (sa, tkm->sas, ({
          ikev2_child_sa_t *c;
          u8 del_old_ids = 0;
          if (sa->old_remote_id_present && 0 > sa->old_id_expiration)
            {
              sa->old_remote_id_present = 0;
              del_old_ids = 1;
            }
          else
            sa->old_id_expiration -= 1;

          vec_foreach (c, sa->childs)
            {
            req_sent |= ikev2_mngr_process_child_sa(sa, c, del_old_ids);
            }

          if (ikev2_mngr_process_responder_sas (sa))
            vec_add1 (to_be_deleted, sa - tkm->sas);
        }));
        /* *INDENT-ON* */

        vec_foreach (sai, to_be_deleted)
        {
          sa = pool_elt_at_index (tkm->sas, sai[0]);
          if (sa->is_initiator && sa->is_profile_index_set)
            {
              p = pool_elt_at_index (km->profiles, sa->profile_index);
              if (p)
                {
                  ikev2_initiate_sa_init (vm, p->name);
                }
            }
          vec_foreach (c, sa->childs)
            ikev2_delete_tunnel_interface (km->vnet_main, sa, c);
          hash_unset (tkm->sa_by_rspi, sa->rspi);
          pool_put (tkm->sas, sa);
        }
        vec_free (to_be_deleted);
      }

      /* process ipsec sas */
      ipsec_sa_t *sa;
      /* *INDENT-OFF* */
      pool_foreach (sa, im->sad, ({
        ikev2_mngr_process_ipsec_sa(sa);
      }));
      /* *INDENT-ON* */

      ikev2_process_pending_sa_init (km);

      if (req_sent)
        {
          vlib_process_wait_for_event_or_clock (vm, 5);
          vlib_process_get_events (vm, NULL);
          req_sent = 0;
        }

    }
  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ikev2_mngr_process_node, static) = {
    .function = ikev2_mngr_process_fn,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name =
    "ikev2-manager-process",
};

VLIB_PLUGIN_REGISTER () = {
    .version = VPP_BUILD_VER,
    .description = "Internet Key Exchange (IKEv2) Protocol",
};
/* *INDENT-ON* */

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