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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"
char *s_queue[] = { "direct", "delayed" };
/*
* =====================================
* Note, that h is in network endianity!
* =====================================
*/
void
ospf_lsack_enqueue(struct ospf_neighbor *n, struct ospf_lsa_header *h,
int queue)
{
struct lsah_n *no = mb_alloc(n->pool, sizeof(struct lsah_n));
memcpy(&no->lsa, h, sizeof(struct ospf_lsa_header));
add_tail(&n->ackl[queue], NODE no);
DBG("Adding (%s) ack for %I, ID: %I, RT: %I, Type: %u\n", s_queue[queue],
n->rid, ntohl(h->id), ntohl(h->rt), h->type);
}
void
ospf_lsack_send(struct ospf_neighbor *n, int queue)
{
struct ospf_packet *op;
struct ospf_lsack_packet *pk;
sock *sk;
u16 len, i = 0;
struct ospf_lsa_header *h;
struct lsah_n *no;
struct ospf_iface *ifa = n->ifa;
struct proto *p = &n->ifa->proto->proto;
if (EMPTY_LIST(n->ackl[queue]))
return;
OSPF_TRACE(D_PACKETS, "LS ack sent to %I (%s)", n->ip, s_queue[queue]);
if (ifa->type == OSPF_IT_BCAST)
sk = ifa->hello_sk;
else
sk = ifa->ip_sk;
pk = (struct ospf_lsack_packet *) sk->tbuf;
op = (struct ospf_packet *) sk->tbuf;
ospf_pkt_fill_hdr(n->ifa, pk, LSACK_P);
h = (struct ospf_lsa_header *) (pk + 1);
while (!EMPTY_LIST(n->ackl[queue]))
{
no = (struct lsah_n *) HEAD(n->ackl[queue]);
memcpy(h + i, &no->lsa, sizeof(struct ospf_lsa_header));
i++;
DBG("Iter %u ID: %I, RT: %I, Type: %u\n", i, ntohl((h + i)->id),
ntohl((h + i)->rt), (h + i)->type);
rem_node(NODE no);
mb_free(no);
if ((i * sizeof(struct ospf_lsa_header) +
sizeof(struct ospf_lsack_packet)) > ospf_pkt_maxsize(n->ifa))
{
if (!EMPTY_LIST(n->ackl[queue]))
{
len =
sizeof(struct ospf_lsack_packet) +
i * sizeof(struct ospf_lsa_header);
op->length = htons(len);
DBG("Sending and continuing! Len=%u\n", len);
if (ifa->type == OSPF_IT_BCAST)
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to(sk, AllSPFRouters, ifa);
else
ospf_send_to(sk, AllDRouters, ifa);
}
else
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to_agt(sk, ifa, NEIGHBOR_EXCHANGE);
else
ospf_send_to_bdr(sk, ifa);
}
ospf_pkt_fill_hdr(n->ifa, pk, LSACK_P);
i = 0;
}
}
}
len = sizeof(struct ospf_lsack_packet) + i * sizeof(struct ospf_lsa_header);
op->length = htons(len);
DBG("Sending! Len=%u\n", len);
if (ifa->type == OSPF_IT_BCAST)
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
{
ospf_send_to(sk, AllSPFRouters, ifa);
}
else
{
ospf_send_to(sk, AllDRouters, ifa);
}
}
else
{
ospf_send_to_agt(sk, ifa, NEIGHBOR_EXCHANGE);
}
}
void
ospf_lsack_receive(struct ospf_lsack_packet *ps,
struct ospf_iface *ifa, struct ospf_neighbor *n)
{
struct ospf_lsa_header lsa, *plsa;
u16 nolsa;
struct top_hash_entry *en;
struct proto *p = (struct proto *) ifa->proto;
unsigned int size = ntohs(ps->ospf_packet.length), i;
OSPF_TRACE(D_PACKETS, "Received LS ack from %I", n->ip);
ospf_neigh_sm(n, INM_HELLOREC);
if (n->state < NEIGHBOR_EXCHANGE)
return;
nolsa = (size - sizeof(struct ospf_lsack_packet)) /
sizeof(struct ospf_lsa_header);
if ((nolsa < 1) || ((size - sizeof(struct ospf_lsack_packet)) !=
(nolsa * sizeof(struct ospf_lsa_header))))
{
log(L_ERR "Received corrupted LS ack from %I", n->ip);
return;
}
plsa = (struct ospf_lsa_header *) (ps + 1);
for (i = 0; i < nolsa; i++)
{
ntohlsah(plsa + i, &lsa);
if ((en = ospf_hash_find_header(n->lsrth, &lsa)) == NULL)
continue; /* pg 155 */
if (lsa_comp(&lsa, &en->lsa) != CMP_SAME) /* pg 156 */
{
if ((lsa.sn == LSA_MAXSEQNO) && (lsa.age == LSA_MAXAGE))
continue;
OSPF_TRACE(D_PACKETS, "Strange LS acknoledgement from %I", n->ip);
OSPF_TRACE(D_PACKETS, "Id: %I, Rt: %I, Type: %u",
lsa.id, lsa.rt, lsa.type);
OSPF_TRACE(D_PACKETS, "I have: Age: %4u, Seqno: 0x%08x, Sum: %u",
en->lsa.age, en->lsa.sn, en->lsa.checksum);
OSPF_TRACE(D_PACKETS, "He has: Age: %4u, Seqno: 0x%08x, Sum: %u",
lsa.age, lsa.sn, lsa.checksum);
continue;
}
DBG("Deleting LS Id: %I RT: %I Type: %u from LS Retl for neighbor %I\n",
lsa.id, lsa.rt, lsa.type, n->rid);
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);
}
}
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