Logo Search packages:      
Sourcecode: ipsec-tools version File versions  Download package

isakmp_inf.c

/*    $NetBSD: isakmp_inf.c,v 1.14.4.14 2008/07/11 08:08:42 tteras Exp $      */

/* Id: isakmp_inf.c,v 1.44 2006/05/06 20:45:52 manubsd Exp */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>

#include <net/pfkeyv2.h>
#include <netinet/in.h>
#include <sys/queue.h>
#include PATH_IPSEC_H

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
#ifdef ENABLE_HYBRID
#include <resolv.h>
#endif

#include "libpfkey.h"

#include "var.h"
#include "vmbuf.h"
#include "schedule.h"
#include "str2val.h"
#include "misc.h"
#include "plog.h"
#include "debug.h"

#include "localconf.h"
#include "remoteconf.h"
#include "sockmisc.h"
#include "handler.h"
#include "policy.h"
#include "proposal.h"
#include "isakmp_var.h"
#include "evt.h"
#include "isakmp.h"
#ifdef ENABLE_HYBRID
#include "isakmp_xauth.h"
#include "isakmp_unity.h"
#include "isakmp_cfg.h" 
#endif
#include "isakmp_inf.h"
#include "oakley.h"
#include "ipsec_doi.h"
#include "crypto_openssl.h"
#include "pfkey.h"
#include "policy.h"
#include "algorithm.h"
#include "proposal.h"
#include "admin.h"
#include "strnames.h"
#ifdef ENABLE_NATT
#include "nattraversal.h"
#endif

/* information exchange */
static int isakmp_info_recv_n (struct ph1handle *, struct isakmp_pl_n *, u_int32_t, int);
static int isakmp_info_recv_d (struct ph1handle *, struct isakmp_pl_d *, u_int32_t, int);

#ifdef ENABLE_DPD
static int isakmp_info_recv_r_u __P((struct ph1handle *,
      struct isakmp_pl_ru *, u_int32_t));
static int isakmp_info_recv_r_u_ack __P((struct ph1handle *,
      struct isakmp_pl_ru *, u_int32_t));
static void isakmp_info_send_r_u __P((void *));
#endif

static void purge_isakmp_spi __P((int, isakmp_index *, size_t));
static void info_recv_initialcontact __P((struct ph1handle *));

/* %%%
 * Information Exchange
 */
/*
 * receive Information
 */
int
isakmp_info_recv(iph1, msg0)
      struct ph1handle *iph1;
      vchar_t *msg0;
{
      vchar_t *msg = NULL;
      vchar_t *pbuf = NULL;
      u_int32_t msgid = 0;
      int error = -1;
      struct isakmp *isakmp;
      struct isakmp_gen *gen;
      struct isakmp_parse_t *pa, *pap;
      void *p;
      vchar_t *hash, *payload;
      struct isakmp_gen *nd;
      u_int8_t np;
      int encrypted;
      int flag;

      plog(LLV_DEBUG, LOCATION, NULL, "receive Information.\n");

      encrypted = ISSET(((struct isakmp *)msg0->v)->flags, ISAKMP_FLAG_E);
      msgid = ((struct isakmp *)msg0->v)->msgid;

      /* Use new IV to decrypt Informational message. */
      if (encrypted) {
            struct isakmp_ivm *ivm;

            if (iph1->ivm == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL, "iph1->ivm == NULL\n");
                  return -1;
            }

            /* compute IV */
            ivm = oakley_newiv2(iph1, ((struct isakmp *)msg0->v)->msgid);
            if (ivm == NULL)
                  return -1;

            msg = oakley_do_decrypt(iph1, msg0, ivm->iv, ivm->ive);
            oakley_delivm(ivm);
            if (msg == NULL)
                  return -1;

      } else
            msg = vdup(msg0);

      /* Safety check */
      if (msg->l < sizeof(*isakmp) + sizeof(*gen)) {
            plog(LLV_ERROR, LOCATION, NULL, 
                  "ignore information because the "
                  "message is way too short - %zu byte(s).\n", msg->l);
            goto end;
      }

      isakmp = (struct isakmp *)msg->v;
      gen = (struct isakmp_gen *)((caddr_t)isakmp + sizeof(struct isakmp));
      np = gen->np;

      if (encrypted) {
            if (isakmp->np != ISAKMP_NPTYPE_HASH) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "ignore information because the"
                      "message has no hash payload.\n");
                  goto end;
            }

            if (iph1->status != PHASE1ST_ESTABLISHED) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "ignore information because ISAKMP-SA"
                      "has not been established yet.\n");
                  goto end;
            }
            
            /* Safety check */
            if (msg->l < sizeof(*isakmp) + ntohs(gen->len) + sizeof(*nd)) {
                  plog(LLV_ERROR, LOCATION, NULL, 
                        "ignore information because the "
                        "message is too short - %zu byte(s).\n", msg->l);
                  goto end;
            }

            p = (caddr_t) gen + sizeof(struct isakmp_gen);
            nd = (struct isakmp_gen *) ((caddr_t) gen + ntohs(gen->len));

            /* nd length check */
            if (ntohs(nd->len) > msg->l - (sizeof(struct isakmp) +
                ntohs(gen->len))) {
                  plog(LLV_ERROR, LOCATION, NULL,
                         "too long payload length (broken message?)\n");
                  goto end;
            }

            if (ntohs(nd->len) < sizeof(*nd)) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "too short payload length (broken message?)\n");
                  goto end;
            }

            payload = vmalloc(ntohs(nd->len));
            if (payload == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "cannot allocate memory\n");
                  goto end;
            }

            memcpy(payload->v, (caddr_t) nd, ntohs(nd->len));

            /* compute HASH */
            hash = oakley_compute_hash1(iph1, isakmp->msgid, payload);
            if (hash == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "cannot compute hash\n");

                  vfree(payload);
                  goto end;
            }
            
            if (ntohs(gen->len) - sizeof(struct isakmp_gen) != hash->l) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "ignore information due to hash length mismatch\n");

                  vfree(hash);
                  vfree(payload);
                  goto end;
            }

            if (memcmp(p, hash->v, hash->l) != 0) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "ignore information due to hash mismatch\n");

                  vfree(hash);
                  vfree(payload);
                  goto end;
            }

            plog(LLV_DEBUG, LOCATION, NULL, "hash validated.\n");

            vfree(hash);
            vfree(payload);
      } else {
            /* make sure the packet was encrypted after the beginning of phase 1. */
            switch (iph1->etype) {
            case ISAKMP_ETYPE_AGG:
            case ISAKMP_ETYPE_BASE:
            case ISAKMP_ETYPE_IDENT:
                  if ((iph1->side == INITIATOR && iph1->status < PHASE1ST_MSG3SENT)
                   || (iph1->side == RESPONDER && iph1->status < PHASE1ST_MSG2SENT)) {
                        break;
                  }
                  /*FALLTHRU*/
            default:
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "%s message must be encrypted\n",
                        s_isakmp_nptype(np));
                  error = 0;
                  goto end;
            }
      }

      if (!(pbuf = isakmp_parse(msg))) {
            error = -1;
            goto end;
      }

      error = 0;
      for (pa = (struct isakmp_parse_t *)pbuf->v; pa->type; pa++) {
            switch (pa->type) {
            case ISAKMP_NPTYPE_HASH:
                  /* Handled above */
                  break;
            case ISAKMP_NPTYPE_N:
                  error = isakmp_info_recv_n(iph1,
                        (struct isakmp_pl_n *)pa->ptr,
                        msgid, encrypted);
                  break;
            case ISAKMP_NPTYPE_D:
                  error = isakmp_info_recv_d(iph1,
                        (struct isakmp_pl_d *)pa->ptr,
                        msgid, encrypted);
                  break;
            case ISAKMP_NPTYPE_NONCE:
                  /* XXX to be 6.4.2 ike-01.txt */
                  /* XXX IV is to be synchronized. */
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "ignore Acknowledged Informational\n");
                  break;
            default:
                  /* don't send information, see isakmp_ident_r1() */
                  error = 0;
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "reject the packet, "
                        "received unexpected payload type %s.\n",
                        s_isakmp_nptype(gen->np));
            }
            if(error < 0) {
                  break;
            } else {
                  flag |= error;
            }
      }
    end:
      if (msg != NULL)
            vfree(msg);
      if (pbuf != NULL)
            vfree(pbuf);
      return error;
}

/*
 * handling of Notification payload
 */
static int
isakmp_info_recv_n(iph1, notify, msgid, encrypted)
      struct ph1handle *iph1;
      struct isakmp_pl_n *notify;
      u_int32_t msgid;
      int encrypted;
{
      u_int type;
      vchar_t *pbuf;
      vchar_t *ndata;
      char *nraw;
      size_t l;
      char *spi;

      type = ntohs(notify->type);

      switch (type) {
      case ISAKMP_NTYPE_CONNECTED:
      case ISAKMP_NTYPE_RESPONDER_LIFETIME:
      case ISAKMP_NTYPE_REPLAY_STATUS:
#ifdef ENABLE_HYBRID
      case ISAKMP_NTYPE_UNITY_HEARTBEAT:
#endif
            /* do something */
            break;
      case ISAKMP_NTYPE_INITIAL_CONTACT:
            if (encrypted)
                  info_recv_initialcontact(iph1);
                  return 0;
            break;
#ifdef ENABLE_DPD
      case ISAKMP_NTYPE_R_U_THERE:
            if (encrypted)
                  return isakmp_info_recv_r_u(iph1,
                        (struct isakmp_pl_ru *)notify, msgid);
            break;
      case ISAKMP_NTYPE_R_U_THERE_ACK:
            if (encrypted)
                  return isakmp_info_recv_r_u_ack(iph1,
                        (struct isakmp_pl_ru *)notify, msgid);
            break;
#endif
      default:
          {
            /* XXX there is a potential of dos attack. */
            if(type >= ISAKMP_NTYPE_MINERROR &&
               type <= ISAKMP_NTYPE_MAXERROR) {
                  if (msgid == 0) {
                        /* don't think this realy deletes ph1 ? */
                        plog(LLV_ERROR, LOCATION, iph1->remote,
                              "delete phase1 handle.\n");
                        return -1;
                  } else {
                        if (getph2bymsgid(iph1, msgid) == NULL) {
                              plog(LLV_ERROR, LOCATION, iph1->remote,
                                    "fatal %s notify messsage, "
                                    "phase1 should be deleted.\n",
                                    s_isakmp_notify_msg(type));
                        } else {
                              plog(LLV_ERROR, LOCATION, iph1->remote,
                                    "fatal %s notify messsage, "
                                    "phase2 should be deleted.\n",
                                    s_isakmp_notify_msg(type));
                        }
                  }
            } else {
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "unhandled notify message %s, "
                        "no phase2 handle found.\n",
                        s_isakmp_notify_msg(type));
            }
          }
          break;
      }

      /* get spi if specified and allocate */
      if(notify->spi_size > 0) {
            if (ntohs(notify->h.len) < sizeof(*notify) + notify->spi_size) {
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "invalid spi_size in notification payload.\n");
                  return -1;
            }
            spi = val2str((char *)(notify + 1), notify->spi_size);

            plog(LLV_DEBUG, LOCATION, iph1->remote,
                  "notification message %d:%s, "
                  "doi=%d proto_id=%d spi=%s(size=%d).\n",
                  type, s_isakmp_notify_msg(type),
                  ntohl(notify->doi), notify->proto_id, spi, notify->spi_size);

            racoon_free(spi);
      }

      /* Send the message data to the logs */
      if(type >= ISAKMP_NTYPE_MINERROR &&
         type <= ISAKMP_NTYPE_MAXERROR) {
            l = ntohs(notify->h.len) - sizeof(*notify) - notify->spi_size;
            if (l > 0) {
                  nraw = (char*)notify;   
                  nraw += sizeof(*notify) + notify->spi_size;
                  if ((ndata = vmalloc(l)) != NULL) {
                        memcpy(ndata->v, nraw, ndata->l);
                        plog(LLV_ERROR, LOCATION, iph1->remote,
                            "Message: '%s'.\n", 
                            binsanitize(ndata->v, ndata->l));
                        vfree(ndata);
                  } else {
                        plog(LLV_ERROR, LOCATION, iph1->remote,
                            "Cannot allocate memory\n");
                  }
            }
      }
      return 0;
}

/*
 * handling of Deletion payload
 */
static int
isakmp_info_recv_d(iph1, delete, msgid, encrypted)
      struct ph1handle *iph1;
      struct isakmp_pl_d *delete;
      u_int32_t msgid;
      int encrypted;
{
      int tlen, num_spi;
      vchar_t *pbuf;
      int protected = 0;
      struct ph1handle *del_ph1;
      struct ph2handle *iph2;
      union {
            u_int32_t spi32;
            u_int16_t spi16[2];
      } spi;

      if (ntohl(delete->doi) != IPSEC_DOI) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "delete payload with invalid doi:%d.\n",
                  ntohl(delete->doi));
#ifdef ENABLE_HYBRID
            /*
             * At deconnexion time, Cisco VPN client does this
             * with a zero DOI. Don't give up in that situation.
             */
            if (((iph1->mode_cfg->flags &
                ISAKMP_CFG_VENDORID_UNITY) == 0) || (delete->doi != 0))
                  return 0;
#else
            return 0;
#endif
      }

      num_spi = ntohs(delete->num_spi);
      tlen = ntohs(delete->h.len) - sizeof(struct isakmp_pl_d);

      if (tlen != num_spi * delete->spi_size) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "deletion payload with invalid length.\n");
            return 0;
      }

      plog(LLV_DEBUG, LOCATION, iph1->remote,
            "delete payload for protocol %s\n",
            s_ipsecdoi_proto(delete->proto_id));

      if(!iph1->rmconf->weak_phase1_check && !encrypted) {
            plog(LLV_WARNING, LOCATION, iph1->remote,
                  "Ignoring unencrypted delete payload "
                  "(check the weak_phase1_check option)\n");
            return 0;
      }

      switch (delete->proto_id) {
      case IPSECDOI_PROTO_ISAKMP:
            if (delete->spi_size != sizeof(isakmp_index)) {
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "delete payload with strange spi "
                        "size %d(proto_id:%d)\n",
                        delete->spi_size, delete->proto_id);
                  return 0;
            }

            del_ph1=getph1byindex((isakmp_index *)(delete + 1));
            if(del_ph1 != NULL){

                  EVT_PUSH(del_ph1->local, del_ph1->remote,
                  EVTT_PEERPH1_NOPROP, NULL);
                  if (del_ph1->scr)
                        SCHED_KILL(del_ph1->scr);

                  /*
                   * Do not delete IPsec SAs when receiving an IKE delete notification.
                   * Just delete the IKE SA.
                   */
                  isakmp_ph1expire(del_ph1);
            }
            break;

      case IPSECDOI_PROTO_IPSEC_AH:
      case IPSECDOI_PROTO_IPSEC_ESP:
            if (delete->spi_size != sizeof(u_int32_t)) {
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "delete payload with strange spi "
                        "size %d(proto_id:%d)\n",
                        delete->spi_size, delete->proto_id);
                  return 0;
            }
            EVT_PUSH(iph1->local, iph1->remote, 
                EVTT_PEER_DELETE, NULL);
            purge_ipsec_spi(iph1->remote, delete->proto_id,
                (u_int32_t *)(delete + 1), num_spi);
            break;

      case IPSECDOI_PROTO_IPCOMP:
            /* need to handle both 16bit/32bit SPI */
            memset(&spi, 0, sizeof(spi));
            if (delete->spi_size == sizeof(spi.spi16[1])) {
                  memcpy(&spi.spi16[1], delete + 1,
                      sizeof(spi.spi16[1]));
            } else if (delete->spi_size == sizeof(spi.spi32))
                  memcpy(&spi.spi32, delete + 1, sizeof(spi.spi32));
            else {
                  plog(LLV_ERROR, LOCATION, iph1->remote,
                        "delete payload with strange spi "
                        "size %d(proto_id:%d)\n",
                        delete->spi_size, delete->proto_id);
                  return 0;
            }
            purge_ipsec_spi(iph1->remote, delete->proto_id,
                &spi.spi32, num_spi);
            break;

      default:
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "deletion message received, "
                  "invalid proto_id: %d\n",
                  delete->proto_id);
            return 0;
      }

      plog(LLV_DEBUG, LOCATION, NULL, "purged SAs.\n");

      return 0;
}

/*
 * send Delete payload (for ISAKMP SA) in Informational exchange.
 */
int
isakmp_info_send_d1(iph1)
      struct ph1handle *iph1;
{
      struct isakmp_pl_d *d;
      vchar_t *payload = NULL;
      int tlen;
      int error = 0;

      if (iph1->status != PHASE2ST_ESTABLISHED)
            return 0;

      /* create delete payload */

      /* send SPIs of inbound SAs. */
      /* XXX should send outbound SAs's ? */
      tlen = sizeof(*d) + sizeof(isakmp_index);
      payload = vmalloc(tlen);
      if (payload == NULL) {
            plog(LLV_ERROR, LOCATION, NULL, 
                  "failed to get buffer for payload.\n");
            return errno;
      }

      d = (struct isakmp_pl_d *)payload->v;
      d->h.np = ISAKMP_NPTYPE_NONE;
      d->h.len = htons(tlen);
      d->doi = htonl(IPSEC_DOI);
      d->proto_id = IPSECDOI_PROTO_ISAKMP;
      d->spi_size = sizeof(isakmp_index);
      d->num_spi = htons(1);
      memcpy(d + 1, &iph1->index, sizeof(isakmp_index));

      error = isakmp_info_send_common(iph1, payload,
                              ISAKMP_NPTYPE_D, 0);
      vfree(payload);

      return error;
}

/*
 * send Delete payload (for IPsec SA) in Informational exchange, based on
 * pfkey msg.  It sends always single SPI.
 */
int
isakmp_info_send_d2(iph2)
      struct ph2handle *iph2;
{
      struct ph1handle *iph1;
      struct saproto *pr;
      struct isakmp_pl_d *d;
      vchar_t *payload = NULL;
      int tlen;
      int error = 0;
      u_int8_t *spi;

      if (iph2->status != PHASE2ST_ESTABLISHED)
            return 0;

      /*
       * don't send delete information if there is no phase 1 handler.
       * It's nonsensical to negotiate phase 1 to send the information.
       */
      iph1 = getph1byaddr(iph2->src, iph2->dst, 0);
      if (iph1 == NULL){
            plog(LLV_DEBUG2, LOCATION, NULL,
                   "No ph1 handler found, could not send DELETE_SA\n");
            return 0;
      }

      /* create delete payload */
      for (pr = iph2->approval->head; pr != NULL; pr = pr->next) {

            /* send SPIs of inbound SAs. */
            /*
             * XXX should I send outbound SAs's ?
             * I send inbound SAs's SPI only at the moment because I can't
             * decode any more if peer send encoded packet without aware of
             * deletion of SA.  Outbound SAs don't come under the situation.
             */
            tlen = sizeof(*d) + pr->spisize;
            payload = vmalloc(tlen);
            if (payload == NULL) {
                  plog(LLV_ERROR, LOCATION, NULL, 
                        "failed to get buffer for payload.\n");
                  return errno;
            }

            d = (struct isakmp_pl_d *)payload->v;
            d->h.np = ISAKMP_NPTYPE_NONE;
            d->h.len = htons(tlen);
            d->doi = htonl(IPSEC_DOI);
            d->proto_id = pr->proto_id;
            d->spi_size = pr->spisize;
            d->num_spi = htons(1);
            /*
             * XXX SPI bits are left-filled, for use with IPComp.
             * we should be switching to variable-length spi field...
             */
            spi = (u_int8_t *)&pr->spi;
            spi += sizeof(pr->spi);
            spi -= pr->spisize;
            memcpy(d + 1, spi, pr->spisize);

            error = isakmp_info_send_common(iph1, payload,
                                    ISAKMP_NPTYPE_D, 0);
            vfree(payload);
      }

      return error;
}

/*
 * send Notification payload (for without ISAKMP SA) in Informational exchange
 */
int
isakmp_info_send_nx(isakmp, remote, local, type, data)
      struct isakmp *isakmp;
      struct sockaddr *remote, *local;
      int type;
      vchar_t *data;
{
      struct ph1handle *iph1 = NULL;
      struct remoteconf *rmconf;
      vchar_t *payload = NULL;
      int tlen;
      int error = -1;
      struct isakmp_pl_n *n;
      int spisiz = 0;         /* see below */

      /* search appropreate configuration */
      rmconf = getrmconf(remote);
      if (rmconf == NULL) {
            plog(LLV_ERROR, LOCATION, remote,
                  "no configuration found for peer address.\n");
            goto end;
      }

      /* add new entry to isakmp status table. */
      iph1 = newph1();
      if (iph1 == NULL)
            return -1;

      memcpy(&iph1->index.i_ck, &isakmp->i_ck, sizeof(cookie_t));
      isakmp_newcookie((char *)&iph1->index.r_ck, remote, local);
      iph1->status = PHASE1ST_START;
      iph1->rmconf = rmconf;
      iph1->side = INITIATOR;
      iph1->version = isakmp->v;
      iph1->flags = 0;
      iph1->msgid = 0;  /* XXX */
#ifdef ENABLE_HYBRID
      if ((iph1->mode_cfg = isakmp_cfg_mkstate()) == NULL)
            goto end;
#endif
#ifdef ENABLE_FRAG
      iph1->frag = 0;
      iph1->frag_chain = NULL;
#endif

      /* copy remote address */
      if (copy_ph1addresses(iph1, rmconf, remote, local) < 0)
            goto end;

      tlen = sizeof(*n) + spisiz;
      if (data)
            tlen += data->l;
      payload = vmalloc(tlen);
      if (payload == NULL) { 
            plog(LLV_ERROR, LOCATION, NULL,
                  "failed to get buffer to send.\n");
            goto end;
      }

      n = (struct isakmp_pl_n *)payload->v;
      n->h.np = ISAKMP_NPTYPE_NONE;
      n->h.len = htons(tlen);
      n->doi = htonl(IPSEC_DOI);
      n->proto_id = IPSECDOI_KEY_IKE;
      n->spi_size = spisiz;
      n->type = htons(type);
      if (spisiz)
            memset(n + 1, 0, spisiz);     /* XXX spisiz is always 0 */
      if (data)
            memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l);

      error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0);
      vfree(payload);

    end:
      if (iph1 != NULL)
            delph1(iph1);

      return error;
}

/*
 * send Notification payload (for ISAKMP SA) in Informational exchange
 */
int
isakmp_info_send_n1(iph1, type, data)
      struct ph1handle *iph1;
      int type;
      vchar_t *data;
{
      vchar_t *payload = NULL;
      int tlen;
      int error = 0;
      struct isakmp_pl_n *n;
      int spisiz;

      /*
       * note on SPI size: which description is correct?  I have chosen
       * this to be 0.
       *
       * RFC2408 3.1, 2nd paragraph says: ISAKMP SA is identified by
       * Initiator/Responder cookie and SPI has no meaning, SPI size = 0.
       * RFC2408 3.1, first paragraph on page 40: ISAKMP SA is identified
       * by cookie and SPI has no meaning, 0 <= SPI size <= 16.
       * RFC2407 4.6.3.3, INITIAL-CONTACT is required to set to 16.
       */
      if (type == ISAKMP_NTYPE_INITIAL_CONTACT)
            spisiz = sizeof(isakmp_index);
      else
            spisiz = 0;

      tlen = sizeof(*n) + spisiz;
      if (data)
            tlen += data->l;
      payload = vmalloc(tlen);
      if (payload == NULL) { 
            plog(LLV_ERROR, LOCATION, NULL,
                  "failed to get buffer to send.\n");
            return errno;
      }

      n = (struct isakmp_pl_n *)payload->v;
      n->h.np = ISAKMP_NPTYPE_NONE;
      n->h.len = htons(tlen);
      n->doi = htonl(iph1->rmconf->doitype);
      n->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX to be configurable ? */
      n->spi_size = spisiz;
      n->type = htons(type);
      if (spisiz)
            memcpy(n + 1, &iph1->index, sizeof(isakmp_index));
      if (data)
            memcpy((caddr_t)(n + 1) + spisiz, data->v, data->l);

      error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph1->flags);
      vfree(payload);

      return error;
}

/*
 * send Notification payload (for IPsec SA) in Informational exchange
 */
int
isakmp_info_send_n2(iph2, type, data)
      struct ph2handle *iph2;
      int type;
      vchar_t *data;
{
      struct ph1handle *iph1 = iph2->ph1;
      vchar_t *payload = NULL;
      int tlen;
      int error = 0;
      struct isakmp_pl_n *n;
      struct saproto *pr;

      if (!iph2->approval)
            return EINVAL;

      pr = iph2->approval->head;

      /* XXX must be get proper spi */
      tlen = sizeof(*n) + pr->spisize;
      if (data)
            tlen += data->l;
      payload = vmalloc(tlen);
      if (payload == NULL) { 
            plog(LLV_ERROR, LOCATION, NULL,
                  "failed to get buffer to send.\n");
            return errno;
      }

      n = (struct isakmp_pl_n *)payload->v;
      n->h.np = ISAKMP_NPTYPE_NONE;
      n->h.len = htons(tlen);
      n->doi = htonl(IPSEC_DOI);          /* IPSEC DOI (1) */
      n->proto_id = pr->proto_id;         /* IPSEC AH/ESP/whatever*/
      n->spi_size = pr->spisize;
      n->type = htons(type);
      *(u_int32_t *)(n + 1) = pr->spi;
      if (data)
            memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l);

      iph2->flags |= ISAKMP_FLAG_E; /* XXX Should we do FLAG_A ? */
      error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, iph2->flags);
      vfree(payload);

      return error;
}

/*
 * send Information
 * When ph1->skeyid_a == NULL, send message without encoding.
 */
int
isakmp_info_send_common(iph1, payload, np, flags)
      struct ph1handle *iph1;
      vchar_t *payload;
      u_int32_t np;
      int flags;
{
      struct ph2handle *iph2 = NULL;
      vchar_t *hash = NULL;
      struct isakmp *isakmp;
      struct isakmp_gen *gen;
      char *p;
      int tlen;
      int error = -1;

      /* add new entry to isakmp status table */
      iph2 = newph2();
      if (iph2 == NULL)
            goto end;

      iph2->dst = dupsaddr(iph1->remote);
      if (iph2->dst == NULL) {
            delph2(iph2);
            goto end;
      }
      iph2->src = dupsaddr(iph1->local);
      if (iph2->src == NULL) {
            delph2(iph2);
            goto end;
      }
#if (!defined(ENABLE_NATT)) || (defined(BROKEN_NATT))
      if (set_port(iph2->dst, 0) == NULL ||
          set_port(iph2->src, 0) == NULL) {
            plog(LLV_ERROR, LOCATION, NULL,
                 "invalid family: %d\n", iph1->remote->sa_family);
            delph2(iph2);
            goto end;
      }
#endif
      iph2->ph1 = iph1;
      iph2->side = INITIATOR;
      iph2->status = PHASE2ST_START;
      iph2->msgid = isakmp_newmsgid2(iph1);

      /* get IV and HASH(1) if skeyid_a was generated. */
      if (iph1->skeyid_a != NULL) {
            iph2->ivm = oakley_newiv2(iph1, iph2->msgid);
            if (iph2->ivm == NULL) {
                  delph2(iph2);
                  goto end;
            }

            /* generate HASH(1) */
            hash = oakley_compute_hash1(iph2->ph1, iph2->msgid, payload);
            if (hash == NULL) {
                  delph2(iph2);
                  goto end;
            }

            /* initialized total buffer length */
            tlen = hash->l;
            tlen += sizeof(*gen);
      } else {
            /* IKE-SA is not established */
            hash = NULL;

            /* initialized total buffer length */
            tlen = 0;
      }
      if ((flags & ISAKMP_FLAG_A) == 0)
            iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_E);
      else
            iph2->flags = (hash == NULL ? 0 : ISAKMP_FLAG_A);

      insph2(iph2);
      bindph12(iph1, iph2);

      tlen += sizeof(*isakmp) + payload->l;

      /* create buffer for isakmp payload */
      iph2->sendbuf = vmalloc(tlen);
      if (iph2->sendbuf == NULL) { 
            plog(LLV_ERROR, LOCATION, NULL,
                  "failed to get buffer to send.\n");
            goto err;
      }

      /* create isakmp header */
      isakmp = (struct isakmp *)iph2->sendbuf->v;
      memcpy(&isakmp->i_ck, &iph1->index.i_ck, sizeof(cookie_t));
      memcpy(&isakmp->r_ck, &iph1->index.r_ck, sizeof(cookie_t));
      isakmp->np = hash == NULL ? (np & 0xff) : ISAKMP_NPTYPE_HASH;
      isakmp->v = iph1->version;
      isakmp->etype = ISAKMP_ETYPE_INFO;
      isakmp->flags = iph2->flags;
      memcpy(&isakmp->msgid, &iph2->msgid, sizeof(isakmp->msgid));
      isakmp->len   = htonl(tlen);
      p = (char *)(isakmp + 1);

      /* create HASH payload */
      if (hash != NULL) {
            gen = (struct isakmp_gen *)p;
            gen->np = np & 0xff;
            gen->len = htons(sizeof(*gen) + hash->l);
            p += sizeof(*gen);
            memcpy(p, hash->v, hash->l);
            p += hash->l;
      }

      /* add payload */
      memcpy(p, payload->v, payload->l);
      p += payload->l;

#ifdef HAVE_PRINT_ISAKMP_C
      isakmp_printpacket(iph2->sendbuf, iph1->local, iph1->remote, 1);
#endif

      /* encoding */
      if (ISSET(isakmp->flags, ISAKMP_FLAG_E)) {
            vchar_t *tmp;

            tmp = oakley_do_encrypt(iph2->ph1, iph2->sendbuf, iph2->ivm->ive,
                        iph2->ivm->iv);
            VPTRINIT(iph2->sendbuf);
            if (tmp == NULL)
                  goto err;
            iph2->sendbuf = tmp;
      }

      /* HDR*, HASH(1), N */
      if (isakmp_send(iph2->ph1, iph2->sendbuf) < 0) {
            VPTRINIT(iph2->sendbuf);
            goto err;
      }

      plog(LLV_DEBUG, LOCATION, NULL,
            "sendto Information %s.\n", s_isakmp_nptype(np));

      /*
       * don't resend notify message because peer can use Acknowledged
       * Informational if peer requires the reply of the notify message.
       */

      /* XXX If Acknowledged Informational required, don't delete ph2handle */
      error = 0;
      VPTRINIT(iph2->sendbuf);
      goto err;   /* XXX */

end:
      if (hash)
            vfree(hash);
      return error;

err:
      unbindph12(iph2);
      remph2(iph2);
      delph2(iph2);
      goto end;
}

/*
 * add a notify payload to buffer by reallocating buffer.
 * If buf == NULL, the function only create a notify payload.
 *
 * XXX Which is SPI to be included, inbound or outbound ?
 */
vchar_t *
isakmp_add_pl_n(buf0, np_p, type, pr, data)
      vchar_t *buf0;
      u_int8_t **np_p;
      int type;
      struct saproto *pr;
      vchar_t *data;
{
      vchar_t *buf = NULL;
      struct isakmp_pl_n *n;
      int tlen;
      int oldlen = 0;

      if (*np_p)
            **np_p = ISAKMP_NPTYPE_N;

      tlen = sizeof(*n) + pr->spisize;

      if (data)
            tlen += data->l;
      if (buf0) {
            oldlen = buf0->l;
            buf = vrealloc(buf0, buf0->l + tlen);
      } else
            buf = vmalloc(tlen);
      if (!buf) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "failed to get a payload buffer.\n");
            return NULL;
      }

      n = (struct isakmp_pl_n *)(buf->v + oldlen);
      n->h.np = ISAKMP_NPTYPE_NONE;
      n->h.len = htons(tlen);
      n->doi = htonl(IPSEC_DOI);          /* IPSEC DOI (1) */
      n->proto_id = pr->proto_id;         /* IPSEC AH/ESP/whatever*/
      n->spi_size = pr->spisize;
      n->type = htons(type);
      *(u_int32_t *)(n + 1) = pr->spi;    /* XXX */
      if (data)
            memcpy((caddr_t)(n + 1) + pr->spisize, data->v, data->l);

      /* save the pointer of next payload type */
      *np_p = &n->h.np;

      return buf;
}

static void
purge_isakmp_spi(proto, spi, n)
      int proto;
      isakmp_index *spi;      /*network byteorder*/
      size_t n;
{
      struct ph1handle *iph1;
      size_t i;

      for (i = 0; i < n; i++) {
            iph1 = getph1byindex(&spi[i]);
            if (!iph1)
                  continue;

            plog(LLV_INFO, LOCATION, NULL,
                  "purged ISAKMP-SA proto_id=%s spi=%s.\n",
                  s_ipsecdoi_proto(proto),
                  isakmp_pindex(&spi[i], 0));

            SCHED_KILL(iph1->sce);
            iph1->status = PHASE1ST_EXPIRED;
            iph1->sce = sched_new(1, isakmp_ph1delete_stub, iph1);
      }
}



void
purge_ipsec_spi(dst0, proto, spi, n)
      struct sockaddr *dst0;
      int proto;
      u_int32_t *spi;   /*network byteorder*/
      size_t n;
{
      vchar_t *buf = NULL;
      struct sadb_msg *msg, *next, *end;
      struct sadb_sa *sa;
      struct sadb_lifetime *lt;
      struct sockaddr *src, *dst;
      struct ph2handle *iph2;
      u_int64_t created;
      size_t i;
      caddr_t mhp[SADB_EXT_MAX + 1];
#ifdef ENABLE_NATT
      struct sadb_x_nat_t_type *natt_type;
      struct sadb_x_nat_t_port *natt_port;
#endif

      plog(LLV_DEBUG2, LOCATION, NULL,
             "purge_ipsec_spi:\n");
      plog(LLV_DEBUG2, LOCATION, NULL, "dst0: %s\n", saddr2str(dst0));
      plog(LLV_DEBUG2, LOCATION, NULL, "SPI: %08X\n", ntohl(spi[0]));

      buf = pfkey_dump_sadb(ipsecdoi2pfkey_proto(proto));
      if (buf == NULL) {
            plog(LLV_DEBUG, LOCATION, NULL,
                  "pfkey_dump_sadb returned nothing.\n");
            return;
      }

      msg = (struct sadb_msg *)buf->v;
      end = (struct sadb_msg *)(buf->v + buf->l);

      while (msg < end) {
            if ((msg->sadb_msg_len << 3) < sizeof(*msg))
                  break;
            next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3));
            if (msg->sadb_msg_type != SADB_DUMP) {
                  msg = next;
                  continue;
            }

            if (pfkey_align(msg, mhp) || pfkey_check(mhp)) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "pfkey_check (%s)\n", ipsec_strerror());
                  msg = next;
                  continue;
            }

            sa = (struct sadb_sa *)(mhp[SADB_EXT_SA]);
            if (!sa
             || !mhp[SADB_EXT_ADDRESS_SRC]
             || !mhp[SADB_EXT_ADDRESS_DST]) {
                  msg = next;
                  continue;
            }
            src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]);
            dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]);
            lt = (struct sadb_lifetime*)mhp[SADB_EXT_LIFETIME_HARD];
            if(lt != NULL)
                  created = lt->sadb_lifetime_addtime;
            else
                  created = 0;

            if (sa->sadb_sa_state != SADB_SASTATE_MATURE
             && sa->sadb_sa_state != SADB_SASTATE_DYING) {
                  msg = next;
                  continue;
            }
#ifdef ENABLE_NATT
            natt_type = (void *)mhp[SADB_X_EXT_NAT_T_TYPE];
            if (natt_type && natt_type->sadb_x_nat_t_type_type) {
                  /* NAT-T is enabled for this SADB entry; copy
                   * the ports from NAT-T extensions */
                  natt_port = (void *)mhp[SADB_X_EXT_NAT_T_SPORT];
                  if (extract_port(src) == 0 && natt_port != NULL)
                        set_port(src, ntohs(natt_port->sadb_x_nat_t_port_port));

                  natt_port = (void *)mhp[SADB_X_EXT_NAT_T_DPORT];
                  if (extract_port(dst) == 0 && natt_port != NULL)
                        set_port(dst, ntohs(natt_port->sadb_x_nat_t_port_port));
            }
#endif
            plog(LLV_DEBUG2, LOCATION, NULL, "src: %s\n", saddr2str(src));
            plog(LLV_DEBUG2, LOCATION, NULL, "dst: %s\n", saddr2str(dst));

            /* XXX n^2 algorithm, inefficient */

            /* don't delete inbound SAs at the moment */
            /* XXX should we remove SAs with opposite direction as well? */
            if (CMPSADDR(dst0, dst)) {
                  msg = next;
                  continue;
            }

            for (i = 0; i < n; i++) {
                  plog(LLV_DEBUG, LOCATION, NULL,
                        "check spi(packet)=%u spi(db)=%u.\n",
                        ntohl(spi[i]), ntohl(sa->sadb_sa_spi));
                  if (spi[i] != sa->sadb_sa_spi)
                        continue;

                  pfkey_send_delete(lcconf->sock_pfkey,
                        msg->sadb_msg_satype,
                        IPSEC_MODE_ANY,
                        src, dst, sa->sadb_sa_spi);

                  /*
                   * delete a relative phase 2 handler.
                   * continue to process if no relative phase 2 handler
                   * exists.
                   */
                  iph2 = getph2bysaidx(src, dst, proto, spi[i]);
                  if(iph2 != NULL){
                        delete_spd(iph2, created);
                        unbindph12(iph2);
                        remph2(iph2);
                        delph2(iph2);
                  }

                  plog(LLV_INFO, LOCATION, NULL,
                        "purged IPsec-SA proto_id=%s spi=%u.\n",
                        s_ipsecdoi_proto(proto),
                        ntohl(spi[i]));
            }

            msg = next;
      }

      if (buf)
            vfree(buf);
}

/*
 * delete all phase2 sa relatived to the destination address.
 * Don't delete Phase 1 handlers on INITIAL-CONTACT, and don't ignore
 * an INITIAL-CONTACT if we have contacted the peer.  This matches the
 * Sun IKE behavior, and makes rekeying work much better when the peer
 * restarts.
 */
static void
info_recv_initialcontact(iph1)
      struct ph1handle *iph1;
{
      vchar_t *buf = NULL;
      struct sadb_msg *msg, *next, *end;
      struct sadb_sa *sa;
      struct sockaddr *src, *dst;
      caddr_t mhp[SADB_EXT_MAX + 1];
      int proto_id, i;
      struct ph2handle *iph2;
#if 0
      char *loc, *rem;
#endif

      if (f_local)
            return;

#if 0
      loc = racoon_strdup(saddrwop2str(iph1->local));
      rem = racoon_strdup(saddrwop2str(iph1->remote));
      STRDUP_FATAL(loc);
      STRDUP_FATAL(rem);

      /*
       * Purge all IPSEC-SAs for the peer.  We can do this
       * the easy way (using a PF_KEY SADB_DELETE extension)
       * or we can do it the hard way.
       */
      for (i = 0; i < pfkey_nsatypes; i++) {
            proto_id = pfkey2ipsecdoi_proto(pfkey_satypes[i].ps_satype);

            plog(LLV_INFO, LOCATION, NULL,
                "purging %s SAs for %s -> %s\n",
                pfkey_satypes[i].ps_name, loc, rem);
            if (pfkey_send_delete_all(lcconf->sock_pfkey,
                pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY,
                iph1->local, iph1->remote) == -1) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "delete_all %s -> %s failed for %s (%s)\n",
                      loc, rem,
                      pfkey_satypes[i].ps_name, ipsec_strerror());
                  goto the_hard_way;
            }

            deleteallph2(iph1->local, iph1->remote, proto_id);

            plog(LLV_INFO, LOCATION, NULL,
                "purging %s SAs for %s -> %s\n",
                pfkey_satypes[i].ps_name, rem, loc);
            if (pfkey_send_delete_all(lcconf->sock_pfkey,
                pfkey_satypes[i].ps_satype, IPSEC_MODE_ANY,
                iph1->remote, iph1->local) == -1) {
                  plog(LLV_ERROR, LOCATION, NULL,
                      "delete_all %s -> %s failed for %s (%s)\n",
                      rem, loc,
                      pfkey_satypes[i].ps_name, ipsec_strerror());
                  goto the_hard_way;
            }

            deleteallph2(iph1->remote, iph1->local, proto_id);
      }

      racoon_free(loc);
      racoon_free(rem);
      return;

 the_hard_way:
      racoon_free(loc);
      racoon_free(rem);
#endif

      buf = pfkey_dump_sadb(SADB_SATYPE_UNSPEC);
      if (buf == NULL) {
            plog(LLV_DEBUG, LOCATION, NULL,
                  "pfkey_dump_sadb returned nothing.\n");
            return;
      }

      msg = (struct sadb_msg *)buf->v;
      end = (struct sadb_msg *)(buf->v + buf->l);

      while (msg < end) {
            if ((msg->sadb_msg_len << 3) < sizeof(*msg))
                  break;
            next = (struct sadb_msg *)((caddr_t)msg + (msg->sadb_msg_len << 3));
            if (msg->sadb_msg_type != SADB_DUMP) {
                  msg = next;
                  continue;
            }

            if (pfkey_align(msg, mhp) || pfkey_check(mhp)) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "pfkey_check (%s)\n", ipsec_strerror());
                  msg = next;
                  continue;
            }

            if (mhp[SADB_EXT_SA] == NULL
             || mhp[SADB_EXT_ADDRESS_SRC] == NULL
             || mhp[SADB_EXT_ADDRESS_DST] == NULL) {
                  msg = next;
                  continue;
            }
            sa = (struct sadb_sa *)mhp[SADB_EXT_SA];
            src = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_SRC]);
            dst = PFKEY_ADDR_SADDR(mhp[SADB_EXT_ADDRESS_DST]);

            if (sa->sadb_sa_state != SADB_SASTATE_MATURE
             && sa->sadb_sa_state != SADB_SASTATE_DYING) {
                  msg = next;
                  continue;
            }

            /*
             * RFC2407 4.6.3.3 INITIAL-CONTACT is the message that
             * announces the sender of the message was rebooted.
             * it is interpreted to delete all SAs which source address
             * is the sender of the message.
             * racoon only deletes SA which is matched both the
             * source address and the destination accress.
             */
#ifdef ENABLE_NATT
            /* 
             * XXX RFC 3947 says that whe MUST NOT use IP+port to find old SAs
             * from this peer !
             */
            if(iph1->natt_flags & NAT_DETECTED){
                  if (CMPSADDR(iph1->local, src) == 0 &&
                        CMPSADDR(iph1->remote, dst) == 0)
                        ;
                  else if (CMPSADDR(iph1->remote, src) == 0 &&
                               CMPSADDR(iph1->local, dst) == 0)
                        ;
                  else {
                        msg = next;
                        continue;
                  }
            } else
#endif
            /* If there is no NAT-T, we don't have to check addr + port...
             * XXX what about a configuration with a remote peers which is not
             * NATed, but which NATs some other peers ?
             * Here, the INITIAl-CONTACT would also flush all those NATed peers !!
             */
            if (cmpsaddrwop(iph1->local, src) == 0 &&
                cmpsaddrwop(iph1->remote, dst) == 0)
                  ;
            else if (cmpsaddrwop(iph1->remote, src) == 0 &&
                cmpsaddrwop(iph1->local, dst) == 0)
                  ;
            else {
                  msg = next;
                  continue;
            }

            /*
             * Make sure this is an SATYPE that we manage.
             * This is gross; too bad we couldn't do it the
             * easy way.
             */
            for (i = 0; i < pfkey_nsatypes; i++) {
                  if (pfkey_satypes[i].ps_satype ==
                      msg->sadb_msg_satype)
                        break;
            }
            if (i == pfkey_nsatypes) {
                  msg = next;
                  continue;
            }

            plog(LLV_INFO, LOCATION, NULL,
                  "purging spi=%u.\n", ntohl(sa->sadb_sa_spi));
            pfkey_send_delete(lcconf->sock_pfkey,
                  msg->sadb_msg_satype,
                  IPSEC_MODE_ANY, src, dst, sa->sadb_sa_spi);

            /*
             * delete a relative phase 2 handler.
             * continue to process if no relative phase 2 handler
             * exists.
             */
            proto_id = pfkey2ipsecdoi_proto(msg->sadb_msg_satype);
            iph2 = getph2bysaidx(src, dst, proto_id, sa->sadb_sa_spi);
            if (iph2) {
                  delete_spd(iph2, 0);
                  unbindph12(iph2);
                  remph2(iph2);
                  delph2(iph2);
            }

            msg = next;
      }

      vfree(buf);
}

void
isakmp_check_notify(gen, iph1)
      struct isakmp_gen *gen;       /* points to Notify payload */
      struct ph1handle *iph1;
{
      struct isakmp_pl_n *notify = (struct isakmp_pl_n *)gen;

      plog(LLV_DEBUG, LOCATION, iph1->remote,
            "Notify Message received\n");

      switch (ntohs(notify->type)) {
      case ISAKMP_NTYPE_CONNECTED:
      case ISAKMP_NTYPE_RESPONDER_LIFETIME:
      case ISAKMP_NTYPE_REPLAY_STATUS:
      case ISAKMP_NTYPE_HEARTBEAT:
#ifdef ENABLE_HYBRID
      case ISAKMP_NTYPE_UNITY_HEARTBEAT:
#endif
            plog(LLV_WARNING, LOCATION, iph1->remote,
                  "ignore %s notification.\n",
                  s_isakmp_notify_msg(ntohs(notify->type)));
            break;
      case ISAKMP_NTYPE_INITIAL_CONTACT:
            plog(LLV_WARNING, LOCATION, iph1->remote,
                  "ignore INITIAL-CONTACT notification, "
                  "because it is only accepted after phase1.\n");
            break;
      default:
            isakmp_info_send_n1(iph1, ISAKMP_NTYPE_INVALID_PAYLOAD_TYPE, NULL);
            plog(LLV_ERROR, LOCATION, iph1->remote,
                  "received unknown notification type %s.\n",
                  s_isakmp_notify_msg(ntohs(notify->type)));
      }

      return;
}


#ifdef ENABLE_DPD
static int
isakmp_info_recv_r_u (iph1, ru, msgid)
      struct ph1handle *iph1;
      struct isakmp_pl_ru *ru;
      u_int32_t msgid;
{
      struct isakmp_pl_ru *ru_ack;
      vchar_t *payload = NULL;
      int tlen;
      int error = 0;

      plog(LLV_DEBUG, LOCATION, iph1->remote,
             "DPD R-U-There received\n");

      /* XXX should compare cookies with iph1->index?
         Or is this already done by calling function?  */
      tlen = sizeof(*ru_ack);
      payload = vmalloc(tlen);
      if (payload == NULL) { 
            plog(LLV_ERROR, LOCATION, NULL,
                  "failed to get buffer to send.\n");
            return errno;
      }

      ru_ack = (struct isakmp_pl_ru *)payload->v;
      ru_ack->h.np = ISAKMP_NPTYPE_NONE;
      ru_ack->h.len = htons(tlen);
      ru_ack->doi = htonl(IPSEC_DOI);
      ru_ack->type = htons(ISAKMP_NTYPE_R_U_THERE_ACK);
      ru_ack->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ? */
      ru_ack->spi_size = sizeof(isakmp_index);
      memcpy(ru_ack->i_ck, ru->i_ck, sizeof(cookie_t));
      memcpy(ru_ack->r_ck, ru->r_ck, sizeof(cookie_t));     
      ru_ack->data = ru->data;

      /* XXX Should we do FLAG_A ?  */
      error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N,
                              ISAKMP_FLAG_E);
      vfree(payload);

      plog(LLV_DEBUG, LOCATION, NULL, "received a valid R-U-THERE, ACK sent\n");

      /* Should we mark tunnel as active ? */
      return error;
}

static int
isakmp_info_recv_r_u_ack (iph1, ru, msgid)
      struct ph1handle *iph1;
      struct isakmp_pl_ru *ru;
      u_int32_t msgid;
{

      plog(LLV_DEBUG, LOCATION, iph1->remote,
             "DPD R-U-There-Ack received\n");

      /* XXX Maintain window of acceptable sequence numbers ?
       * => ru->data <= iph2->dpd_seq &&
       *    ru->data >= iph2->dpd_seq - iph2->dpd_fails ? */
      if (ntohl(ru->data) != iph1->dpd_seq-1) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                   "Wrong DPD sequence number (%d, %d expected).\n", 
                   ntohl(ru->data), iph1->dpd_seq-1);
            return 0;
      }

      if (memcmp(ru->i_ck, iph1->index.i_ck, sizeof(cookie_t)) ||
          memcmp(ru->r_ck, iph1->index.r_ck, sizeof(cookie_t))) {
            plog(LLV_ERROR, LOCATION, iph1->remote,
                   "Cookie mismatch in DPD ACK!.\n");
            return 0;
      }

      iph1->dpd_fails = 0;

      /* Useless ??? */
      iph1->dpd_lastack = time(NULL);

      SCHED_KILL(iph1->dpd_r_u);

      isakmp_sched_r_u(iph1, 0);

      plog(LLV_DEBUG, LOCATION, NULL, "received an R-U-THERE-ACK\n");

      return 0;
}




/*
 * send DPD R-U-THERE payload in Informational exchange.
 */
static void
isakmp_info_send_r_u(arg)
      void *arg;
{
      struct ph1handle *iph1 = arg;

      /* create R-U-THERE payload */
      struct isakmp_pl_ru *ru;
      vchar_t *payload = NULL;
      int tlen;
      int error = 0;

      plog(LLV_DEBUG, LOCATION, iph1->remote, "DPD monitoring....\n");

      iph1->dpd_r_u=NULL;

      if (iph1->dpd_fails >= iph1->rmconf->dpd_maxfails) {

            plog(LLV_INFO, LOCATION, iph1->remote,
                  "DPD: remote (ISAKMP-SA spi=%s) seems to be dead.\n",
                  isakmp_pindex(&iph1->index, 0));

            EVT_PUSH(iph1->local, iph1->remote, EVTT_DPD_TIMEOUT, NULL);
            purge_remote(iph1);

            /* Do not reschedule here: phase1 is deleted,
             * DPD will be reactivated when a new ph1 will be negociated
             */
            return;
      }

      /* TODO: check recent activity to avoid useless sends... */

      tlen = sizeof(*ru);
      payload = vmalloc(tlen);
      if (payload == NULL) {
            plog(LLV_ERROR, LOCATION, NULL, 
                   "failed to get buffer for payload.\n");
            return;
      }
      ru = (struct isakmp_pl_ru *)payload->v;
      ru->h.np = ISAKMP_NPTYPE_NONE;
      ru->h.len = htons(tlen);
      ru->doi = htonl(IPSEC_DOI);
      ru->type = htons(ISAKMP_NTYPE_R_U_THERE);
      ru->proto_id = IPSECDOI_PROTO_ISAKMP; /* XXX ?*/
      ru->spi_size = sizeof(isakmp_index);

      memcpy(ru->i_ck, iph1->index.i_ck, sizeof(cookie_t));
      memcpy(ru->r_ck, iph1->index.r_ck, sizeof(cookie_t));

      if (iph1->dpd_seq == 0){
            /* generate a random seq which is not too big */
            srand(time(NULL));
            iph1->dpd_seq = rand() & 0x0fff;
      }

      ru->data = htonl(iph1->dpd_seq);

      error = isakmp_info_send_common(iph1, payload, ISAKMP_NPTYPE_N, 0);
      vfree(payload);

      plog(LLV_DEBUG, LOCATION, iph1->remote,
             "DPD R-U-There sent (%d)\n", error);

      /* will be decreased if ACK received... */
      iph1->dpd_fails++;

      /* XXX should be increased only when ACKed ? */
      iph1->dpd_seq++;

      /* Reschedule the r_u_there with a short delay,
       * will be deleted/rescheduled if ACK received before */
      isakmp_sched_r_u(iph1, 1);

      plog(LLV_DEBUG, LOCATION, iph1->remote,
             "rescheduling send_r_u (%d).\n", iph1->rmconf->dpd_retry);
}

/* Schedule a new R-U-THERE */
int
isakmp_sched_r_u(iph1, retry)
      struct ph1handle *iph1;
      int retry;
{
      if(iph1 == NULL ||
         iph1->rmconf == NULL)
            return 1;


      if(iph1->dpd_support == 0 ||
         iph1->rmconf->dpd_interval == 0)
            return 0;

      if(retry)
            iph1->dpd_r_u = sched_new(iph1->rmconf->dpd_retry,
                                                  isakmp_info_send_r_u, iph1);
      else
            iph1->dpd_r_u = sched_new(iph1->rmconf->dpd_interval,
                                                  isakmp_info_send_r_u, iph1);

      return 0;
}
#endif

Generated by  Doxygen 1.6.0   Back to index