/* $NetBSD: fsm.c,v 1.16 2022/06/26 17:55:38 riastradh Exp $ */

/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Mihai Chelaru <[email protected]>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <net/if.h>

#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>

#include "ldp.h"
#include "ldp_peer.h"
#include "socketops.h"
#include "ldp_errors.h"
#include "fsm.h"

char            my_ldp_id[20];
struct sockaddr mplssockaddr;

/* Process a hello */
void
run_ldp_hello(const struct ldp_pdu * pduid, const struct hello_tlv * ht,
   const struct sockaddr * padd, const struct in_addr * ladd, int mysock,
   bool may_connect)
{
       struct ldp_peer *peer = NULL;
       const struct transport_address_tlv *trtlv;
       struct hello_info *hi = NULL;
       union sockunion traddr;
       struct in_addr ldp_id;

       if ((!pduid) || (!ht))
               return;

       debugp("Hello received for address: %s\n", inet_ntoa(*ladd));
       debugp("Hello: Type: 0x%.4X Length: %.2d ID: %.8X\n", ht->type,
           ht->length, ht->messageid);

       if (ht->length <= 4)    /* Common hello parameters */
               return;
       debugp("Common hello Type: 0x%.4X Length: %.2d"
           " Hold time: %d\n", ntohs(ht->ch.type), ntohs(ht->ch.length),
           ht->ch.holdtime);

       memset(&traddr, 0, sizeof(traddr));
       /* Check transport TLV */
       if (pduid->length - PDU_PAYLOAD_LENGTH -
           sizeof(struct hello_tlv) >= 8) {
               trtlv = (const struct transport_address_tlv *)(ht + 1);
               if (trtlv->type == htons(TLV_IPV4_TRANSPORT)) {
                       traddr.sin.sin_family = AF_INET;
                       traddr.sin.sin_len = sizeof(struct sockaddr_in);
                       memcpy(&traddr.sin.sin_addr,
                           &trtlv->address, sizeof(struct in_addr));
               } else if (trtlv->type == htons(TLV_IPV6_TRANSPORT)) {
                       traddr.sin6.sin6_family = AF_INET6;
                       traddr.sin6.sin6_len = sizeof(struct sockaddr_in6);
                       memcpy(&traddr.sin6.sin6_addr,
                           &trtlv->address, sizeof(struct in6_addr));
               } else
                       warnp("Unknown AF %x for transport address\n",
                           ntohs(trtlv->type));
       } else {
               /* Use LDP ID as transport address */
               traddr.sin.sin_family = AF_INET;
               traddr.sin.sin_len = sizeof(struct sockaddr_in);
               memcpy(&traddr.sin.sin_addr,
                   &pduid->ldp_id, sizeof(struct in_addr));
       }
       /* Add it to hello list or just update timer */
       SLIST_FOREACH(hi, &hello_info_head, infos)
               if (hi->ldp_id.s_addr == pduid->ldp_id.s_addr &&
                   sockaddr_cmp(&hi->transport_address.sa, &traddr.sa) == 0)
                       break;
       if (hi == NULL) {
               hi = calloc(1, sizeof(*hi));
               if (!hi) {
                       fatalp("Cannot alloc a hello info structure");
                       return;
               }
               hi->ldp_id.s_addr = pduid->ldp_id.s_addr;
               memcpy(&hi->transport_address, &traddr, traddr.sa.sa_len);
               SLIST_INSERT_HEAD(&hello_info_head, hi, infos);
               may_connect = false;
       }

       /* Update expire timer */
       if (ht->ch.holdtime != 0)
               hi->keepalive = ntohs(ht->ch.holdtime);
       else {
               if (ntohs(ht->ch.res) >> 15 == 0)
                       hi->keepalive = LDP_HELLO_KEEP;
               else
                       hi->keepalive = LDP_THELLO_KEEP;
       }

       ldp_id = pduid->ldp_id;
       if (!get_ldp_peer_by_id(&ldp_id)) {
               /*
                * RFC 5036 2.5.2: If A1 > A2, LSR1 plays the active role;
                * otherwise it is passive.
                */
               if (may_connect == true &&
                   (hi->transport_address.sa.sa_family == AF_INET &&
                   ntohl(hi->transport_address.sin.sin_addr.s_addr) <
                   ntohl(ladd->s_addr))) {
                       peer = ldp_peer_new(&ldp_id, padd,
                               &hi->transport_address.sa,
                               ntohs(ht->ch.holdtime), 0);
                       if (peer == NULL)
                               return;
                       if (peer->state == LDP_PEER_CONNECTED)
                               send_initialize(peer);
               }
       }
}

struct address_list_tlv *
build_address_list_tlv(void)
{
       struct address_list_tlv *t;
       struct ifaddrs *ifa, *ifb;
       struct sockaddr_in *sa;
       char *ia;
       uint16_t       adrcount = 0;

       if (getifaddrs(&ifa) == -1)
               return NULL;

       /* Find out the number of addresses */
       /* Ignore loopback */
       for (ifb = ifa; ifb; ifb = ifb->ifa_next)
               if ((ifb->ifa_addr->sa_family == AF_INET) &&
                   (ifb->ifa_flags & IFF_UP)) {
                       sa = (struct sockaddr_in *) ifb->ifa_addr;
                       if (ntohl(sa->sin_addr.s_addr) >> 24 != IN_LOOPBACKNET)
                               adrcount++;
               }
       t = malloc(sizeof(*t) + (adrcount - 1) * sizeof(struct in_addr));

       if (!t) {
               fatalp("build_address_list_tlv: malloc problem\n");
               freeifaddrs(ifa);
               return NULL;
       }

       t->type = htons(LDP_ADDRESS);
       t->length = htons(sizeof(struct address_list_tlv) - TLV_TYPE_LENGTH
                         + (adrcount - 1) * sizeof(struct in_addr));
       t->messageid = htonl(get_message_id());

       t->a_type = htons(TLV_ADDRESS_LIST);
       t->a_length = htons(sizeof(t->a_af) +
           adrcount * sizeof(struct in_addr));
       t->a_af = htons(LDP_AF_INET);

       ia = (void *)&t->a_address;
       for (adrcount = 0, ifb = ifa; ifb; ifb = ifb->ifa_next) {
               if ((ifb->ifa_addr->sa_family != AF_INET) ||
                   (!(ifb->ifa_flags & IFF_UP)))
                       continue;
               sa = (struct sockaddr_in *) ifb->ifa_addr;
               if (ntohl(sa->sin_addr.s_addr) >> 24 == IN_LOOPBACKNET)
                       continue;
               memcpy(ia + adrcount*sizeof(struct in_addr), &sa->sin_addr,
                   sizeof(struct in_addr));
               adrcount++;
       }
       freeifaddrs(ifa);

       return t;
}

/*
* Calculate LDP ID
* Get also mpls pseudo-interface address
*/
int
set_my_ldp_id()
{
       struct ifaddrs *ifa, *ifb;
       struct in_addr  a;
       struct sockaddr_in *sa;

       a.s_addr = 0;
       my_ldp_id[0] = '\0';
       mplssockaddr.sa_len = 0;

       if (getifaddrs(&ifa) == -1)
               return LDP_E_GENERIC;

       for (ifb = ifa; ifb; ifb = ifb->ifa_next)
               if(ifb->ifa_flags & IFF_UP) {
                       if (strncmp("mpls", ifb->ifa_name, 4) == 0 &&
                           ifb->ifa_addr->sa_family == AF_LINK)
                               memcpy(&mplssockaddr, ifb->ifa_addr,
                                   ifb->ifa_addr->sa_len);

                       if (ifb->ifa_addr->sa_family != AF_INET)
                               continue;

                       sa = (struct sockaddr_in *) ifb->ifa_addr;
                       if (ntohl(sa->sin_addr.s_addr) >> 24 == IN_LOOPBACKNET)
                               continue;       /* No 127/8 */
                       if (ntohl(sa->sin_addr.s_addr) > ntohl(a.s_addr))
                               a.s_addr = sa->sin_addr.s_addr;
               }
       freeifaddrs(ifa);
       debugp("LDP ID: %s\n", inet_ntoa(a));
       strlcpy(my_ldp_id, inet_ntoa(a), INET_ADDRSTRLEN);
       setproctitle("LDP ID: %s", my_ldp_id);
       return LDP_E_OK;
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.