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ospf6_message.c
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/*
* Copyright (C) 2003 Yasuhiro Ohara
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <zebra.h>
#include "memory.h"
#include "log.h"
#include "vty.h"
#include "command.h"
#include "thread.h"
#include "linklist.h"
#include "ospf6_proto.h"
#include "ospf6_lsa.h"
#include "ospf6_lsdb.h"
#include "ospf6_network.h"
#include "ospf6_message.h"
#include "ospf6_top.h"
#include "ospf6_area.h"
#include "ospf6_neighbor.h"
#include "ospf6_interface.h"
#include "ospf6_flood.h"
#include "ospf6d.h"
unsigned char conf_debug_ospf6_message[6] = {0x03, 0, 0, 0, 0, 0};
const char *ospf6_message_type_str[] =
{ "Unknown", "Hello", "DbDesc", "LSReq", "LSUpdate", "LSAck" };
/* print functions */
static void
ospf6_header_print (struct ospf6_header *oh)
{
char router_id[16], area_id[16];
inet_ntop (AF_INET, &oh->router_id, router_id, sizeof (router_id));
inet_ntop (AF_INET, &oh->area_id, area_id, sizeof (area_id));
zlog_debug (" OSPFv%d Type:%d Len:%hu Router-ID:%s",
oh->version, oh->type, ntohs (oh->length), router_id);
zlog_debug (" Area-ID:%s Cksum:%hx Instance-ID:%d",
area_id, ntohs (oh->checksum), oh->instance_id);
}
void
ospf6_hello_print (struct ospf6_header *oh)
{
struct ospf6_hello *hello;
char options[16];
char drouter[16], bdrouter[16], neighbor[16];
char *p;
ospf6_header_print (oh);
assert (oh->type == OSPF6_MESSAGE_TYPE_HELLO);
hello = (struct ospf6_hello *)
((caddr_t) oh + sizeof (struct ospf6_header));
inet_ntop (AF_INET, &hello->drouter, drouter, sizeof (drouter));
inet_ntop (AF_INET, &hello->bdrouter, bdrouter, sizeof (bdrouter));
ospf6_options_printbuf (hello->options, options, sizeof (options));
zlog_debug (" I/F-Id:%ld Priority:%d Option:%s",
(u_long) ntohl (hello->interface_id), hello->priority, options);
zlog_debug (" HelloInterval:%hu DeadInterval:%hu",
ntohs (hello->hello_interval), ntohs (hello->dead_interval));
zlog_debug (" DR:%s BDR:%s", drouter, bdrouter);
for (p = (char *) ((caddr_t) hello + sizeof (struct ospf6_hello));
p + sizeof (u_int32_t) <= OSPF6_MESSAGE_END (oh);
p += sizeof (u_int32_t))
{
inet_ntop (AF_INET, (void *) p, neighbor, sizeof (neighbor));
zlog_debug (" Neighbor: %s", neighbor);
}
if (p != OSPF6_MESSAGE_END (oh))
zlog_debug ("Trailing garbage exists");
}
void
ospf6_dbdesc_print (struct ospf6_header *oh)
{
struct ospf6_dbdesc *dbdesc;
char options[16];
char *p;
ospf6_header_print (oh);
assert (oh->type == OSPF6_MESSAGE_TYPE_DBDESC);
dbdesc = (struct ospf6_dbdesc *)
((caddr_t) oh + sizeof (struct ospf6_header));
ospf6_options_printbuf (dbdesc->options, options, sizeof (options));
zlog_debug (" MBZ: %#x Option: %s IfMTU: %hu",
dbdesc->reserved1, options, ntohs (dbdesc->ifmtu));
zlog_debug (" MBZ: %#x Bits: %s%s%s SeqNum: %#lx",
dbdesc->reserved2,
(CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_IBIT) ? "I" : "-"),
(CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_MBIT) ? "M" : "-"),
(CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_MSBIT) ? "m" : "s"),
(u_long) ntohl (dbdesc->seqnum));
for (p = (char *) ((caddr_t) dbdesc + sizeof (struct ospf6_dbdesc));
p + sizeof (struct ospf6_lsa_header) <= OSPF6_MESSAGE_END (oh);
p += sizeof (struct ospf6_lsa_header))
ospf6_lsa_header_print_raw ((struct ospf6_lsa_header *) p);
if (p != OSPF6_MESSAGE_END (oh))
zlog_debug ("Trailing garbage exists");
}
void
ospf6_lsreq_print (struct ospf6_header *oh)
{
char id[16], adv_router[16];
char *p;
ospf6_header_print (oh);
assert (oh->type == OSPF6_MESSAGE_TYPE_LSREQ);
for (p = (char *) ((caddr_t) oh + sizeof (struct ospf6_header));
p + sizeof (struct ospf6_lsreq_entry) <= OSPF6_MESSAGE_END (oh);
p += sizeof (struct ospf6_lsreq_entry))
{
struct ospf6_lsreq_entry *e = (struct ospf6_lsreq_entry *) p;
inet_ntop (AF_INET, &e->adv_router, adv_router, sizeof (adv_router));
inet_ntop (AF_INET, &e->id, id, sizeof (id));
zlog_debug (" [%s Id:%s Adv:%s]",
ospf6_lstype_name (e->type), id, adv_router);
}
if (p != OSPF6_MESSAGE_END (oh))
zlog_debug ("Trailing garbage exists");
}
void
ospf6_lsupdate_print (struct ospf6_header *oh)
{
struct ospf6_lsupdate *lsupdate;
u_long num;
char *p;
ospf6_header_print (oh);
assert (oh->type == OSPF6_MESSAGE_TYPE_LSUPDATE);
lsupdate = (struct ospf6_lsupdate *)
((caddr_t) oh + sizeof (struct ospf6_header));
num = ntohl (lsupdate->lsa_number);
zlog_debug (" Number of LSA: %ld", num);
for (p = (char *) ((caddr_t) lsupdate + sizeof (struct ospf6_lsupdate));
p < OSPF6_MESSAGE_END (oh) &&
p + OSPF6_LSA_SIZE (p) <= OSPF6_MESSAGE_END (oh);
p += OSPF6_LSA_SIZE (p))
{
ospf6_lsa_header_print_raw ((struct ospf6_lsa_header *) p);
if (OSPF6_LSA_SIZE (p) < sizeof (struct ospf6_lsa_header))
{
zlog_debug (" Malformed LSA length, quit printing");
break;
}
}
if (p != OSPF6_MESSAGE_END (oh))
{
char buf[32];
int num = 0;
memset (buf, 0, sizeof (buf));
zlog_debug (" Trailing garbage exists");
while (p < OSPF6_MESSAGE_END (oh))
{
snprintf (buf, sizeof (buf), "%s %2x", buf, *p++);
num++;
if (num == 8)
{
zlog_debug (" %s", buf);
memset (buf, 0, sizeof (buf));
num = 0;
}
}
if (num)
zlog_debug (" %s", buf);
}
}
void
ospf6_lsack_print (struct ospf6_header *oh)
{
char *p;
ospf6_header_print (oh);
assert (oh->type == OSPF6_MESSAGE_TYPE_LSACK);
for (p = (char *) ((caddr_t) oh + sizeof (struct ospf6_header));
p + sizeof (struct ospf6_lsa_header) <= OSPF6_MESSAGE_END (oh);
p += sizeof (struct ospf6_lsa_header))
ospf6_lsa_header_print_raw ((struct ospf6_lsa_header *) p);
if (p != OSPF6_MESSAGE_END (oh))
zlog_debug ("Trailing garbage exists");
}
/* Receive function */
#define MSG_OK 0
#define MSG_NG 1
static int
ospf6_header_examin (struct in6_addr *src, struct in6_addr *dst,
struct ospf6_interface *oi, struct ospf6_header *oh)
{
u_char type;
type = OSPF6_MESSAGE_TYPE_CANONICAL (oh->type);
/* version check */
if (oh->version != OSPFV3_VERSION)
{
if (IS_OSPF6_DEBUG_MESSAGE (type, RECV))
zlog_debug ("Message with unknown version");
return MSG_NG;
}
/* Area-ID check */
if (oh->area_id != oi->area->area_id)
{
if (oh->area_id == BACKBONE_AREA_ID)
{
if (IS_OSPF6_DEBUG_MESSAGE (type, RECV))
zlog_debug ("Message may be via Virtual Link: not supported");
return MSG_NG;
}
if (IS_OSPF6_DEBUG_MESSAGE (type, RECV))
zlog_debug ("Area-ID mismatch");
return MSG_NG;
}
/* Instance-ID check */
if (oh->instance_id != oi->instance_id)
{
if (IS_OSPF6_DEBUG_MESSAGE (type, RECV))
zlog_debug ("Instance-ID mismatch");
return MSG_NG;
}
/* Router-ID check */
if (oh->router_id == oi->area->ospf6->router_id)
zlog_warn ("Detect duplicate Router-ID");
return MSG_OK;
}
static void
ospf6_hello_recv (struct in6_addr *src, struct in6_addr *dst,
struct ospf6_interface *oi, struct ospf6_header *oh)
{
struct ospf6_hello *hello;
struct ospf6_neighbor *on;
char *p;
int twoway = 0;
int neighborchange = 0;
int backupseen = 0;
if (ospf6_header_examin (src, dst, oi, oh) != MSG_OK)
return;
hello = (struct ospf6_hello *)
((caddr_t) oh + sizeof (struct ospf6_header));
/* HelloInterval check */
if (ntohs (hello->hello_interval) != oi->hello_interval)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("HelloInterval mismatch");
return;
}
/* RouterDeadInterval check */
if (ntohs (hello->dead_interval) != oi->dead_interval)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("RouterDeadInterval mismatch");
return;
}
/* E-bit check */
if (OSPF6_OPT_ISSET (hello->options, OSPF6_OPT_E) !=
OSPF6_OPT_ISSET (oi->area->options, OSPF6_OPT_E))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("E-bit mismatch");
return;
}
/* Find neighbor, create if not exist */
on = ospf6_neighbor_lookup (oh->router_id, oi);
if (on == NULL)
{
on = ospf6_neighbor_create (oh->router_id, oi);
on->prev_drouter = on->drouter = hello->drouter;
on->prev_bdrouter = on->bdrouter = hello->bdrouter;
on->priority = hello->priority;
}
/* always override neighbor's source address and ifindex */
on->ifindex = ntohl (hello->interface_id);
memcpy (&on->linklocal_addr, src, sizeof (struct in6_addr));
/* TwoWay check */
for (p = (char *) ((caddr_t) hello + sizeof (struct ospf6_hello));
p + sizeof (u_int32_t) <= OSPF6_MESSAGE_END (oh);
p += sizeof (u_int32_t))
{
u_int32_t *router_id = (u_int32_t *) p;
if (*router_id == oi->area->ospf6->router_id)
twoway++;
}
if (p != OSPF6_MESSAGE_END (oh))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Trailing garbage ignored");
}
/* RouterPriority check */
if (on->priority != hello->priority)
{
on->priority = hello->priority;
neighborchange++;
}
/* DR check */
if (on->drouter != hello->drouter)
{
on->prev_drouter = on->drouter;
on->drouter = hello->drouter;
if (on->prev_drouter == on->router_id || on->drouter == on->router_id)
neighborchange++;
}
/* BDR check */
if (on->bdrouter != hello->bdrouter)
{
on->prev_bdrouter = on->bdrouter;
on->bdrouter = hello->bdrouter;
if (on->prev_bdrouter == on->router_id || on->bdrouter == on->router_id)
neighborchange++;
}
/* BackupSeen check */
if (oi->state == OSPF6_INTERFACE_WAITING)
{
if (hello->bdrouter == on->router_id)
backupseen++;
else if (hello->drouter == on->router_id && hello->bdrouter == htonl (0))
backupseen++;
}
/* Execute neighbor events */
thread_execute (master, hello_received, on, 0);
if (twoway)
thread_execute (master, twoway_received, on, 0);
else
thread_execute (master, oneway_received, on, 0);
/* Schedule interface events */
if (backupseen)
thread_add_event (master, backup_seen, oi, 0);
if (neighborchange)
thread_add_event (master, neighbor_change, oi, 0);
}
static void
ospf6_dbdesc_recv_master (struct ospf6_header *oh,
struct ospf6_neighbor *on)
{
struct ospf6_dbdesc *dbdesc;
char *p;
dbdesc = (struct ospf6_dbdesc *)
((caddr_t) oh + sizeof (struct ospf6_header));
if (on->state < OSPF6_NEIGHBOR_INIT)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor state less than Init, ignore");
return;
}
switch (on->state)
{
case OSPF6_NEIGHBOR_TWOWAY:
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor state is 2-Way, ignore");
return;
case OSPF6_NEIGHBOR_INIT:
thread_execute (master, twoway_received, on, 0);
if (on->state != OSPF6_NEIGHBOR_EXSTART)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor state is not ExStart, ignore");
return;
}
/* else fall through to ExStart */
case OSPF6_NEIGHBOR_EXSTART:
/* if neighbor obeys us as our slave, schedule negotiation_done
and process LSA Headers. Otherwise, ignore this message */
if (! CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_MSBIT) &&
! CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_IBIT) &&
ntohl (dbdesc->seqnum) == on->dbdesc_seqnum)
{
/* execute NegotiationDone */
thread_execute (master, negotiation_done, on, 0);
/* Record neighbor options */
memcpy (on->options, dbdesc->options, sizeof (on->options));
}
else
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Negotiation failed");
return;
}
/* fall through to exchange */
case OSPF6_NEIGHBOR_EXCHANGE:
if (! memcmp (dbdesc, &on->dbdesc_last, sizeof (struct ospf6_dbdesc)))
{
/* Duplicated DatabaseDescription is dropped by master */
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Duplicated dbdesc discarded by Master, ignore");
return;
}
if (CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_MSBIT))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Master/Slave bit mismatch");
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
if (CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_IBIT))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Initialize bit mismatch");
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
if (memcmp (on->options, dbdesc->options, sizeof (on->options)))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Option field mismatch");
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
if (ntohl (dbdesc->seqnum) != on->dbdesc_seqnum)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Sequence number mismatch (%#lx expected)",
(u_long) on->dbdesc_seqnum);
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
break;
case OSPF6_NEIGHBOR_LOADING:
case OSPF6_NEIGHBOR_FULL:
if (! memcmp (dbdesc, &on->dbdesc_last, sizeof (struct ospf6_dbdesc)))
{
/* Duplicated DatabaseDescription is dropped by master */
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Duplicated dbdesc discarded by Master, ignore");
return;
}
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Not duplicate dbdesc in state %s",
ospf6_neighbor_state_str[on->state]);
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
default:
assert (0);
break;
}
/* Process LSA headers */
for (p = (char *) ((caddr_t) dbdesc + sizeof (struct ospf6_dbdesc));
p + sizeof (struct ospf6_lsa_header) <= OSPF6_MESSAGE_END (oh);
p += sizeof (struct ospf6_lsa_header))
{
struct ospf6_lsa *his, *mine;
struct ospf6_lsdb *lsdb = NULL;
his = ospf6_lsa_create_headeronly ((struct ospf6_lsa_header *) p);
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("%s", his->name);
switch (OSPF6_LSA_SCOPE (his->header->type))
{
case OSPF6_SCOPE_LINKLOCAL:
lsdb = on->ospf6_if->lsdb;
break;
case OSPF6_SCOPE_AREA:
lsdb = on->ospf6_if->area->lsdb;
break;
case OSPF6_SCOPE_AS:
lsdb = on->ospf6_if->area->ospf6->lsdb;
break;
case OSPF6_SCOPE_RESERVED:
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Ignoring LSA of reserved scope");
ospf6_lsa_delete (his);
continue;
break;
}
if (ntohs (his->header->type) == OSPF6_LSTYPE_AS_EXTERNAL &&
IS_AREA_STUB (on->ospf6_if->area))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("SeqNumMismatch (E-bit mismatch), discard");
ospf6_lsa_delete (his);
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
mine = ospf6_lsdb_lookup (his->header->type, his->header->id,
his->header->adv_router, lsdb);
if (mine == NULL)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Add request (No database copy)");
ospf6_lsdb_add (his, on->request_list);
}
else if (ospf6_lsa_compare (his, mine) < 0)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Add request (Received MoreRecent)");
ospf6_lsdb_add (his, on->request_list);
}
else
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Discard (Existing MoreRecent)");
ospf6_lsa_delete (his);
}
}
if (p != OSPF6_MESSAGE_END (oh))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Trailing garbage ignored");
}
/* Increment sequence number */
on->dbdesc_seqnum ++;
/* schedule send lsreq */
if (on->thread_send_lsreq == NULL)
on->thread_send_lsreq =
thread_add_event (master, ospf6_lsreq_send, on, 0);
THREAD_OFF (on->thread_send_dbdesc);
/* More bit check */
if (! CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_MBIT) &&
! CHECK_FLAG (on->dbdesc_bits, OSPF6_DBDESC_MBIT))
thread_add_event (master, exchange_done, on, 0);
else
on->thread_send_dbdesc =
thread_add_event (master, ospf6_dbdesc_send_newone, on, 0);
/* save last received dbdesc */
memcpy (&on->dbdesc_last, dbdesc, sizeof (struct ospf6_dbdesc));
}
static void
ospf6_dbdesc_recv_slave (struct ospf6_header *oh,
struct ospf6_neighbor *on)
{
struct ospf6_dbdesc *dbdesc;
char *p;
dbdesc = (struct ospf6_dbdesc *)
((caddr_t) oh + sizeof (struct ospf6_header));
if (on->state < OSPF6_NEIGHBOR_INIT)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor state less than Init, ignore");
return;
}
switch (on->state)
{
case OSPF6_NEIGHBOR_TWOWAY:
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor state is 2-Way, ignore");
return;
case OSPF6_NEIGHBOR_INIT:
thread_execute (master, twoway_received, on, 0);
if (on->state != OSPF6_NEIGHBOR_EXSTART)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor state is not ExStart, ignore");
return;
}
/* else fall through to ExStart */
case OSPF6_NEIGHBOR_EXSTART:
/* If the neighbor is Master, act as Slave. Schedule negotiation_done
and process LSA Headers. Otherwise, ignore this message */
if (CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_IBIT) &&
CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_MBIT) &&
CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_MSBIT) &&
ntohs (oh->length) == sizeof (struct ospf6_header) +
sizeof (struct ospf6_dbdesc))
{
/* set the master/slave bit to slave */
UNSET_FLAG (on->dbdesc_bits, OSPF6_DBDESC_MSBIT);
/* set the DD sequence number to one specified by master */
on->dbdesc_seqnum = ntohl (dbdesc->seqnum);
/* schedule NegotiationDone */
thread_execute (master, negotiation_done, on, 0);
/* Record neighbor options */
memcpy (on->options, dbdesc->options, sizeof (on->options));
}
else
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Negotiation failed");
return;
}
break;
case OSPF6_NEIGHBOR_EXCHANGE:
if (! memcmp (dbdesc, &on->dbdesc_last, sizeof (struct ospf6_dbdesc)))
{
/* Duplicated DatabaseDescription causes slave to retransmit */
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Duplicated dbdesc causes retransmit");
THREAD_OFF (on->thread_send_dbdesc);
on->thread_send_dbdesc =
thread_add_event (master, ospf6_dbdesc_send, on, 0);
return;
}
if (! CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_MSBIT))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Master/Slave bit mismatch");
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
if (CHECK_FLAG (dbdesc->bits, OSPF6_DBDESC_IBIT))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Initialize bit mismatch");
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
if (memcmp (on->options, dbdesc->options, sizeof (on->options)))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Option field mismatch");
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
if (ntohl (dbdesc->seqnum) != on->dbdesc_seqnum + 1)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Sequence number mismatch (%#lx expected)",
(u_long) on->dbdesc_seqnum + 1);
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
break;
case OSPF6_NEIGHBOR_LOADING:
case OSPF6_NEIGHBOR_FULL:
if (! memcmp (dbdesc, &on->dbdesc_last, sizeof (struct ospf6_dbdesc)))
{
/* Duplicated DatabaseDescription causes slave to retransmit */
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Duplicated dbdesc causes retransmit");
THREAD_OFF (on->thread_send_dbdesc);
on->thread_send_dbdesc =
thread_add_event (master, ospf6_dbdesc_send, on, 0);
return;
}
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Not duplicate dbdesc in state %s",
ospf6_neighbor_state_str[on->state]);
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
default:
assert (0);
break;
}
/* Process LSA headers */
for (p = (char *) ((caddr_t) dbdesc + sizeof (struct ospf6_dbdesc));
p + sizeof (struct ospf6_lsa_header) <= OSPF6_MESSAGE_END (oh);
p += sizeof (struct ospf6_lsa_header))
{
struct ospf6_lsa *his, *mine;
struct ospf6_lsdb *lsdb = NULL;
his = ospf6_lsa_create_headeronly ((struct ospf6_lsa_header *) p);
switch (OSPF6_LSA_SCOPE (his->header->type))
{
case OSPF6_SCOPE_LINKLOCAL:
lsdb = on->ospf6_if->lsdb;
break;
case OSPF6_SCOPE_AREA:
lsdb = on->ospf6_if->area->lsdb;
break;
case OSPF6_SCOPE_AS:
lsdb = on->ospf6_if->area->ospf6->lsdb;
break;
case OSPF6_SCOPE_RESERVED:
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Ignoring LSA of reserved scope");
ospf6_lsa_delete (his);
continue;
break;
}
if (OSPF6_LSA_SCOPE (his->header->type) == OSPF6_SCOPE_AS &&
IS_AREA_STUB (on->ospf6_if->area))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("E-bit mismatch with LSA Headers");
ospf6_lsa_delete (his);
thread_add_event (master, seqnumber_mismatch, on, 0);
return;
}
mine = ospf6_lsdb_lookup (his->header->type, his->header->id,
his->header->adv_router, lsdb);
if (mine == NULL || ospf6_lsa_compare (his, mine) < 0)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Add request-list: %s", his->name);
ospf6_lsdb_add (his, on->request_list);
}
else
ospf6_lsa_delete (his);
}
if (p != OSPF6_MESSAGE_END (oh))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Trailing garbage ignored");
}
/* Set sequence number to Master's */
on->dbdesc_seqnum = ntohl (dbdesc->seqnum);
/* schedule send lsreq */
if (on->thread_send_lsreq == NULL)
on->thread_send_lsreq =
thread_add_event (master, ospf6_lsreq_send, on, 0);
THREAD_OFF (on->thread_send_dbdesc);
on->thread_send_dbdesc =
thread_add_event (master, ospf6_dbdesc_send_newone, on, 0);
/* save last received dbdesc */
memcpy (&on->dbdesc_last, dbdesc, sizeof (struct ospf6_dbdesc));
}
static void
ospf6_dbdesc_recv (struct in6_addr *src, struct in6_addr *dst,
struct ospf6_interface *oi, struct ospf6_header *oh)
{
struct ospf6_neighbor *on;
struct ospf6_dbdesc *dbdesc;
if (ospf6_header_examin (src, dst, oi, oh) != MSG_OK)
return;
on = ospf6_neighbor_lookup (oh->router_id, oi);
if (on == NULL)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor not found, ignore");
return;
}
dbdesc = (struct ospf6_dbdesc *)
((caddr_t) oh + sizeof (struct ospf6_header));
/* Interface MTU check */
if (ntohs (dbdesc->ifmtu) != oi->ifmtu)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("I/F MTU mismatch");
return;
}
if (dbdesc->reserved1 || dbdesc->reserved2)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Non-0 reserved field in %s's DbDesc, correct",
on->name);
dbdesc->reserved1 = 0;
dbdesc->reserved2 = 0;
}
if (ntohl (oh->router_id) < ntohl (ospf6->router_id))
ospf6_dbdesc_recv_master (oh, on);
else if (ntohl (ospf6->router_id) < ntohl (oh->router_id))
ospf6_dbdesc_recv_slave (oh, on);
else
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Can't decide which is master, ignore");
}
}
static void
ospf6_lsreq_recv (struct in6_addr *src, struct in6_addr *dst,
struct ospf6_interface *oi, struct ospf6_header *oh)
{
struct ospf6_neighbor *on;
char *p;
struct ospf6_lsreq_entry *e;
struct ospf6_lsdb *lsdb = NULL;
struct ospf6_lsa *lsa;
if (ospf6_header_examin (src, dst, oi, oh) != MSG_OK)
return;
on = ospf6_neighbor_lookup (oh->router_id, oi);
if (on == NULL)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor not found, ignore");
return;
}
if (on->state != OSPF6_NEIGHBOR_EXCHANGE &&
on->state != OSPF6_NEIGHBOR_LOADING &&
on->state != OSPF6_NEIGHBOR_FULL)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor state less than Exchange, ignore");
return;
}
/* Process each request */
for (p = (char *) ((caddr_t) oh + sizeof (struct ospf6_header));
p + sizeof (struct ospf6_lsreq_entry) <= OSPF6_MESSAGE_END (oh);
p += sizeof (struct ospf6_lsreq_entry))
{
e = (struct ospf6_lsreq_entry *) p;
switch (OSPF6_LSA_SCOPE (e->type))
{
case OSPF6_SCOPE_LINKLOCAL:
lsdb = on->ospf6_if->lsdb;
break;
case OSPF6_SCOPE_AREA:
lsdb = on->ospf6_if->area->lsdb;
break;
case OSPF6_SCOPE_AS:
lsdb = on->ospf6_if->area->ospf6->lsdb;
break;
default:
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Ignoring LSA of reserved scope");
continue;
break;
}
/* Find database copy */
lsa = ospf6_lsdb_lookup (e->type, e->id, e->adv_router, lsdb);
if (lsa == NULL)
{
char id[16], adv_router[16];
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
{
inet_ntop (AF_INET, &e->id, id, sizeof (id));
inet_ntop (AF_INET, &e->adv_router, adv_router,
sizeof (adv_router));
zlog_debug ("Can't find requested [%s Id:%s Adv:%s]",
ospf6_lstype_name (e->type), id, adv_router);
}
thread_add_event (master, bad_lsreq, on, 0);
return;
}
ospf6_lsdb_add (ospf6_lsa_copy (lsa), on->lsupdate_list);
}
if (p != OSPF6_MESSAGE_END (oh))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Trailing garbage ignored");
}
/* schedule send lsupdate */
THREAD_OFF (on->thread_send_lsupdate);
on->thread_send_lsupdate =
thread_add_event (master, ospf6_lsupdate_send_neighbor, on, 0);
}
static void
ospf6_lsupdate_recv (struct in6_addr *src, struct in6_addr *dst,
struct ospf6_interface *oi, struct ospf6_header *oh)
{
struct ospf6_neighbor *on;
struct ospf6_lsupdate *lsupdate;
unsigned long num;
char *p;
if (ospf6_header_examin (src, dst, oi, oh) != MSG_OK)
return;
on = ospf6_neighbor_lookup (oh->router_id, oi);
if (on == NULL)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor not found, ignore");
return;
}
if (on->state != OSPF6_NEIGHBOR_EXCHANGE &&
on->state != OSPF6_NEIGHBOR_LOADING &&
on->state != OSPF6_NEIGHBOR_FULL)
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Neighbor state less than Exchange, ignore");
return;
}
lsupdate = (struct ospf6_lsupdate *)
((caddr_t) oh + sizeof (struct ospf6_header));
num = ntohl (lsupdate->lsa_number);
/* Process LSAs */
for (p = (char *) ((caddr_t) lsupdate + sizeof (struct ospf6_lsupdate));
p < OSPF6_MESSAGE_END (oh) &&
p + OSPF6_LSA_SIZE (p) <= OSPF6_MESSAGE_END (oh);
p += OSPF6_LSA_SIZE (p))
{
if (num == 0)
break;
if (OSPF6_LSA_SIZE (p) < sizeof (struct ospf6_lsa_header))
{
if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
zlog_debug ("Malformed LSA length, quit processing");
break;
}
ospf6_receive_lsa (on, (struct ospf6_lsa_header *) p);
num--;
}