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bird/proto/ospf/lsupd.c
Ondrej Filip 86c84d76b7 Huge OSPF database redesign. Since now, all LSAs of all areas 
are in single database. This avoids duplication of external LSAs and
fixes bug in external LSA distribution.
2004-07-15 16:37:52 +00:00

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/*
* BIRD -- OSPF
*
* (c) 2000--2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
/**
* ospf_lsupd_flood - send received or generated lsa to the neighbors
* @n: neighbor than sent this lsa (or NULL if generated)
* @hn: LSA header followed by lsa body in network endianity (may be NULL)
* @hh: LSA header in host endianity (must be filled)
* @iff: interface which received this LSA (or NULL if LSA is generated)
* @oa: ospf_area which is the LSA generated for
* @rtl: add this LSA into retransmission list
*
* return value - was the LSA flooded back?
*/
int
ospf_lsupd_flood(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
struct ospf_lsa_header *hh, struct ospf_iface *iff,
struct ospf_area *oa, int rtl)
{
struct ospf_iface *ifa;
struct ospf_neighbor *nn;
struct top_hash_entry *en;
struct proto_ospf *po = oa->po;
struct proto *p = &po->proto;
int ret, retval = 0;
/* pg 148 */
WALK_LIST(NODE ifa, po->iface_list)
{
if (ifa->stub)
continue;
if (hh->type == LSA_T_EXT)
{
if (ifa->type == OSPF_IT_VLINK)
continue;
if (ifa->oa->stub)
continue;
}
else
{
if (ifa->oa != oa)
continue;
}
ret = 0;
WALK_LIST(NODE nn, ifa->neigh_list)
{
if (nn->state < NEIGHBOR_EXCHANGE)
continue;
if (nn->state < NEIGHBOR_FULL)
{
if ((en = ospf_hash_find_header(nn->lsrqh, nn->ifa->oa->areaid, hh)) != NULL)
{
switch (lsa_comp(hh, &en->lsa))
{
case CMP_OLDER:
continue;
break;
case CMP_SAME:
s_rem_node(SNODE en);
if (en->lsa_body != NULL)
mb_free(en->lsa_body);
en->lsa_body = NULL;
DBG("Removing from lsreq list for neigh %I\n", nn->rid);
ospf_hash_delete(nn->lsrqh, en);
if (EMPTY_SLIST(nn->lsrql))
ospf_neigh_sm(nn, INM_LOADDONE);
continue;
break;
case CMP_NEWER:
s_rem_node(SNODE en);
if (en->lsa_body != NULL)
mb_free(en->lsa_body);
en->lsa_body = NULL;
DBG("Removing from lsreq list for neigh %I\n", nn->rid);
ospf_hash_delete(nn->lsrqh, en);
if (EMPTY_SLIST(nn->lsrql))
ospf_neigh_sm(nn, INM_LOADDONE);
break;
default:
bug("Bug in lsa_comp?");
}
}
}
if (nn == n)
continue;
if (rtl)
{
if ((en = ospf_hash_find_header(nn->lsrth, nn->ifa->oa->areaid, hh)) == NULL)
{
en = ospf_hash_get_header(nn->lsrth, nn->ifa->oa, hh);
}
else
{
s_rem_node(SNODE en);
}
s_add_tail(&nn->lsrtl, SNODE en);
memcpy(&en->lsa, hh, sizeof(struct ospf_lsa_header));
DBG("Adding LSA lsrt RT: %I, Id: %I, Type: %u for n: %I\n",
en->lsa.rt, en->lsa.id, en->lsa.type, nn->ip);
}
else
{
if ((en = ospf_hash_find_header(nn->lsrth, nn->ifa->oa->areaid, hh)) != NULL)
{
s_rem_node(SNODE en);
if (en->lsa_body != NULL)
mb_free(en->lsa_body);
en->lsa_body = NULL;
ospf_hash_delete(nn->lsrth, en);
}
}
ret = 1;
}
if (ret == 0)
continue; /* pg 150 (2) */
if (ifa == iff)
{
if ((n->rid == iff->drid) || n->rid == iff->bdrid)
continue; /* pg 150 (3) */
if (iff->state == OSPF_IS_BACKUP)
continue; /* pg 150 (4) */
retval = 1;
}
{
sock *sk;
u16 len, age;
struct ospf_lsupd_packet *pk;
struct ospf_packet *op;
struct ospf_lsa_header *lh;
if ((ifa->type == OSPF_IT_NBMA) || (ifa->type == OSPF_IT_VLINK))
sk = ifa->ip_sk;
else
sk = ifa->hello_sk;
pk = (struct ospf_lsupd_packet *) sk->tbuf;
op = (struct ospf_packet *) sk->tbuf;
ospf_pkt_fill_hdr(ifa, pk, LSUPD_P);
pk->lsano = htonl(1);
lh = (struct ospf_lsa_header *) (pk + 1);
/* Copy LSA into the packet */
if (hn)
{
memcpy(lh, hn, ntohs(hn->length));
}
else
{
u8 *help;
struct top_hash_entry *en;
htonlsah(hh, lh);
help = (u8 *) (lh + 1);
en = ospf_hash_find_header(po->gr, oa->areaid, hh);
htonlsab(en->lsa_body, help, hh->type, hh->length
- sizeof(struct ospf_lsa_header));
}
len = sizeof(struct ospf_lsupd_packet) + ntohs(lh->length);
age = ntohs(lh->age);
age += ifa->inftransdelay;
if (age > LSA_MAXAGE)
age = LSA_MAXAGE;
lh->age = htons(age);
op->length = htons(len);
OSPF_TRACE(D_PACKETS, "LS upd flooded via %s", ifa->iface->name);
DBG("ID=%I, AGE=%d, SEQ=%x", ntohl(lh->id), ntohs(lh->age),
ntohl(lh->sn));
switch (ifa->type)
{
case OSPF_IT_NBMA:
if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR))
ospf_send_to_agt(sk, ifa, NEIGHBOR_EXCHANGE);
else
ospf_send_to_bdr(sk, ifa);
break;
case OSPF_IT_VLINK:
ospf_send_to(sk, ifa->vip, ifa);
break;
default:
if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR) ||
(ifa->type == OSPF_IT_PTP))
ospf_send_to(sk, AllSPFRouters, ifa);
else
ospf_send_to(sk, AllDRouters, ifa);
}
}
}
return retval;
}
void /* I send all I received in LSREQ */
ospf_lsupd_send_list(struct ospf_neighbor *n, list * l)
{
struct l_lsr_head *llsh;
u16 len;
u32 lsano;
struct top_hash_entry *en;
struct ospf_lsupd_packet *pk;
struct ospf_packet *op;
struct ospf_area *oa = n->ifa->oa;
struct proto_ospf *po = oa->po;
struct proto *p = &po->proto;
void *pktpos;
if (EMPTY_LIST(*l))
return;
pk = (struct ospf_lsupd_packet *) n->ifa->ip_sk->tbuf;
op = (struct ospf_packet *) n->ifa->ip_sk->tbuf;
DBG("LSupd: 1st packet\n");
ospf_pkt_fill_hdr(n->ifa, pk, LSUPD_P);
len = sizeof(struct ospf_lsupd_packet);
lsano = 0;
pktpos = (pk + 1);
WALK_LIST(llsh, *l)
{
if ((en = ospf_hash_find(po->gr, oa->areaid, llsh->lsh.id, llsh->lsh.rt,
llsh->lsh.type)) == NULL)
continue; /* Probably flushed LSA */
/* FIXME This is a bug! I cannot flush LSA that is in lsrt */
DBG("Sending ID=%I, Type=%u, RT=%I Sn: 0x%x Age: %u\n",
llsh->lsh.id, llsh->lsh.type, llsh->lsh.rt, en->lsa.sn, en->lsa.age);
if (((u32) (len + en->lsa.length)) > ospf_pkt_maxsize(n->ifa))
{
pk->lsano = htonl(lsano);
op->length = htons(len);
ospf_send_to(n->ifa->ip_sk, n->ip, n->ifa);
OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", n->ip, lsano);
DBG("LSupd: next packet\n");
ospf_pkt_fill_hdr(n->ifa, pk, LSUPD_P);
len = sizeof(struct ospf_lsupd_packet);
lsano = 0;
pktpos = (pk + 1);
}
htonlsah(&(en->lsa), pktpos);
pktpos = pktpos + sizeof(struct ospf_lsa_header);
htonlsab(en->lsa_body, pktpos, en->lsa.type, en->lsa.length
- sizeof(struct ospf_lsa_header));
pktpos = pktpos + en->lsa.length - sizeof(struct ospf_lsa_header);
len += en->lsa.length;
lsano++;
}
if (lsano > 0)
{
pk->lsano = htonl(lsano);
op->length = htons(len);
OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", n->ip, lsano);
ospf_send_to(n->ifa->ip_sk, n->ip, n->ifa);
}
}
void
ospf_lsupd_receive(struct ospf_lsupd_packet *ps,
struct ospf_iface *ifa, struct ospf_neighbor *n)
{
u32 area;
struct ospf_neighbor *ntmp;
struct ospf_lsa_header *lsa;
struct ospf_area *oa;
struct proto_ospf *po = ifa->oa->po;
struct proto *p = &po->proto;
unsigned int i, sendreq = 1, size = ntohs(ps->ospf_packet.length);
if (n->state < NEIGHBOR_EXCHANGE)
{
OSPF_TRACE(D_PACKETS,
"Received lsupd in lesser state than EXCHANGE from (%I)",
n->ip);
return;
}
if (size <=
(sizeof(struct ospf_lsupd_packet) + sizeof(struct ospf_lsa_header)))
{
log(L_WARN "Received lsupd from %I is too short!", n->ip);
return;
}
OSPF_TRACE(D_PACKETS, "Received LS upd from %I", n->ip);
ospf_neigh_sm(n, INM_HELLOREC); /* Questionable */
lsa = (struct ospf_lsa_header *) (ps + 1);
area = htonl(ps->ospf_packet.areaid);
oa = ospf_find_area((struct proto_ospf *) p, area);
for (i = 0; i < ntohl(ps->lsano); i++,
lsa = (struct ospf_lsa_header *) (((u8 *) lsa) + ntohs(lsa->length)))
{
struct ospf_lsa_header lsatmp;
struct top_hash_entry *lsadb;
unsigned diff = ((u8 *) lsa) - ((u8 *) ps), lenn = ntohs(lsa->length);
u16 chsum;
if (((diff + sizeof(struct ospf_lsa_header)) >= size)
|| ((lenn + diff) > size))
{
log(L_WARN "Received lsupd from %I is too short!", n->ip);
ospf_neigh_sm(n, INM_BADLSREQ);
break;
}
if ((lenn <= sizeof(struct ospf_lsa_header))
|| (lenn != (4 * (lenn / 4))))
{
log(L_WARN "Received LSA from %I with bad length", n->ip);
ospf_neigh_sm(n, INM_BADLSREQ);
break;
}
/* pg 143 (1) */
chsum = lsa->checksum;
if (chsum != lsasum_check(lsa, NULL))
{
log(L_WARN "Received bad lsa checksum from %I", n->ip);
continue;
}
/* pg 143 (2) */
if ((lsa->type < LSA_T_RT) || (lsa->type > LSA_T_EXT))
{
log(L_WARN "Unknown LSA type from %I", n->ip);
continue;
}
/* pg 143 (3) */
if ((lsa->type == LSA_T_EXT) && oa->stub)
{
log(L_WARN "Received External LSA in stub area from %I", n->ip);
continue;
}
ntohlsah(lsa, &lsatmp);
DBG("Update Type: %u ID: %I RT: %I, Sn: 0x%08x Age: %u, Sum: %u\n",
lsatmp.type, lsatmp.id, lsatmp.rt, lsatmp.sn, lsatmp.age,
lsatmp.checksum);
lsadb = ospf_hash_find_header(po->gr, oa->areaid, &lsatmp);
#ifdef LOCAL_DEBUG
if (lsadb)
DBG("I have Type: %u ID: %I RT: %I, Sn: 0x%08x Age: %u, Sum: %u\n",
lsadb->lsa.type, lsadb->lsa.id, lsadb->lsa.rt, lsadb->lsa.sn,
lsadb->lsa.age, lsadb->lsa.checksum);
#endif
/* pg 143 (4) */
if ((lsatmp.age == LSA_MAXAGE) && (lsadb == NULL) && can_flush_lsa(po))
{
ospf_lsack_enqueue(n, lsa, ACKL_DIRECT);
continue;
}
/* pg 144 (5) */
if ((lsadb == NULL) || (lsa_comp(&lsatmp, &lsadb->lsa) == CMP_NEWER))
{
struct ospf_iface *ift = NULL;
void *body;
struct ospf_iface *nifa;
int self = (lsatmp.rt == p->cf->global->router_id);
DBG("PG143(5): Received LSA is newer\n");
/* pg 145 (5f) - premature aging of self originated lsa */
if ((!self) && (lsatmp.type == LSA_T_NET))
{
WALK_LIST(nifa, po->iface_list)
{
if (!nifa->iface)
continue;
if (ipa_equal(nifa->iface->addr->ip, ipa_from_u32(lsatmp.id)))
{
self = 1;
break;
}
}
}
if (self)
{
struct top_hash_entry *en;
if ((lsatmp.age == LSA_MAXAGE) && (lsatmp.sn == LSA_MAXSEQNO))
{
ospf_lsack_enqueue(n, lsa, ACKL_DIRECT);
continue;
}
lsatmp.age = LSA_MAXAGE;
lsatmp.sn = LSA_MAXSEQNO;
lsa->age = htons(LSA_MAXAGE);
lsa->sn = htonl(LSA_MAXSEQNO);
OSPF_TRACE(D_EVENTS, "Premature aging self originated lsa.");
OSPF_TRACE(D_EVENTS, "Type: %d, Id: %I, Rt: %I", lsatmp.type,
lsatmp.id, lsatmp.rt);
lsasum_check(lsa, (lsa + 1)); /* It also calculates chsum! */
lsatmp.checksum = ntohs(lsa->checksum);
ospf_lsupd_flood(NULL, lsa, &lsatmp, NULL, oa, 0);
if (en = ospf_hash_find_header(po->gr, oa->areaid, &lsatmp))
{
ospf_lsupd_flood(NULL, NULL, &en->lsa, NULL, oa, 1);
}
continue;
}
/* pg 144 (5a) */
if (lsadb && ((now - lsadb->inst_t) <= MINLSARRIVAL)) /* FIXME: test for flooding? */
{
DBG("I got it in less that MINLSARRIVAL\n");
sendreq = 0;
continue;
}
if (ospf_lsupd_flood(n, lsa, &lsatmp, ifa, ifa->oa, 1) == 0)
{
DBG("Wasn't flooded back\n"); /* ps 144(5e), pg 153 */
if (ifa->state == OSPF_IS_BACKUP)
{
if (ifa->drid == n->rid)
ospf_lsack_enqueue(n, lsa, ACKL_DELAY);
}
else
ospf_lsack_enqueue(n, lsa, ACKL_DELAY);
}
/* Remove old from all ret lists */
/* pg 144 (5c) */
if (lsadb)
WALK_LIST(NODE ift, po->iface_list)
WALK_LIST(NODE ntmp, ift->neigh_list)
{
struct top_hash_entry *en;
if (ntmp->state > NEIGHBOR_EXSTART)
if ((en = ospf_hash_find_header(ntmp->lsrth, ntmp->ifa->oa->areaid, &lsadb->lsa)) != NULL)
{
s_rem_node(SNODE en);
if (en->lsa_body != NULL)
mb_free(en->lsa_body);
en->lsa_body = NULL;
ospf_hash_delete(ntmp->lsrth, en);
}
}
if ((lsatmp.age == LSA_MAXAGE) && (lsatmp.sn == LSA_MAXSEQNO)
&& lsadb && can_flush_lsa(po))
{
flush_lsa(lsadb, po);
schedule_rtcalc(po);
continue;
} /* FIXME lsack? */
/* pg 144 (5d) */
body =
mb_alloc(p->pool, lsatmp.length - sizeof(struct ospf_lsa_header));
ntohlsab(lsa + 1, body, lsatmp.type,
lsatmp.length - sizeof(struct ospf_lsa_header));
lsadb = lsa_install_new(&lsatmp, body, oa);
DBG("New LSA installed in DB\n");
continue;
}
/* FIXME pg145 (6) */
/* pg145 (7) */
if (lsa_comp(&lsatmp, &lsadb->lsa) == CMP_SAME)
{
struct top_hash_entry *en;
DBG("PG145(7) Got the same LSA\n");
if ((en = ospf_hash_find_header(n->lsrth, n->ifa->oa->areaid, &lsadb->lsa)) != NULL)
{
/* pg145 (7a) */
s_rem_node(SNODE en);
if (en->lsa_body != NULL)
mb_free(en->lsa_body);
en->lsa_body = NULL;
ospf_hash_delete(n->lsrth, en);
if (ifa->state == OSPF_IS_BACKUP)
{
if (n->rid == ifa->drid)
ospf_lsack_enqueue(n, lsa, ACKL_DELAY);
}
}
else
{
/* pg145 (7b) */
ospf_lsack_enqueue(n, lsa, ACKL_DIRECT);
}
sendreq = 0;
continue;
}
/* pg145 (8) */
if ((lsadb->lsa.age == LSA_MAXAGE) && (lsadb->lsa.sn == LSA_MAXSEQNO))
{
continue;
}
{
list l;
struct l_lsr_head ll;
init_list(&l);
ll.lsh.id = lsadb->lsa.id;
ll.lsh.rt = lsadb->lsa.rt;
ll.lsh.type = lsadb->lsa.type;
add_tail(&l, NODE & ll);
ospf_lsupd_send_list(n, &l);
}
}
/* Send direct LSAs */
ospf_lsack_send(n, ACKL_DIRECT);
if (sendreq && (n->state == NEIGHBOR_LOADING))
{
ospf_lsreq_send(n); /* Ask for another part of neighbor's database */
}
}
void
ospf_lsupd_flush_nlsa(struct top_hash_entry *en, struct ospf_area *oa)
{
struct ospf_lsa_header *lsa = &en->lsa;
struct proto_ospf *po = oa->po;
struct proto *p = &po->proto;
lsa->age = LSA_MAXAGE;
lsa->sn = LSA_MAXSEQNO;
lsasum_calculate(lsa, en->lsa_body);
OSPF_TRACE(D_EVENTS, "Premature aging self originated lsa!");
OSPF_TRACE(D_EVENTS, "Type: %d, Id: %I, Rt: %I", lsa->type,
lsa->id, lsa->rt);
ospf_lsupd_flood(NULL, NULL, lsa, NULL, oa, 0);
}
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