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194 lines
5.0 KiB
C
194 lines
5.0 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 2000-2004 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "ospf.h"
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struct ospf_lsack_packet
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{
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struct ospf_packet ospf_packet;
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struct ospf_lsa_header lsh[];
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};
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char *s_queue[] = { "direct", "delayed" };
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static void ospf_dump_lsack(struct proto *p, struct ospf_lsack_packet *pkt)
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{
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struct ospf_packet *op = &pkt->ospf_packet;
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ASSERT(op->type == LSACK_P);
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ospf_dump_common(p, op);
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unsigned int i, j;
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j = (ntohs(op->length) - sizeof(struct ospf_lsack_packet)) /
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sizeof(struct ospf_lsa_header);
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for (i = 0; i < j; i++)
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ospf_dump_lsahdr(p, pkt->lsh + i);
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}
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/*
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* =====================================
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* Note, that h is in network endianity!
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* =====================================
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*/
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void
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ospf_lsack_enqueue(struct ospf_neighbor *n, struct ospf_lsa_header *h,
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int queue)
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{
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struct lsah_n *no = mb_alloc(n->pool, sizeof(struct lsah_n));
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memcpy(&no->lsa, h, sizeof(struct ospf_lsa_header));
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add_tail(&n->ackl[queue], NODE no);
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DBG("Adding (%s) ack for %R, ID: %R, RT: %R, Type: %u\n", s_queue[queue],
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n->rid, ntohl(h->id), ntohl(h->rt), h->type);
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}
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void
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ospf_lsack_send(struct ospf_neighbor *n, int queue)
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{
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struct ospf_packet *op;
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struct ospf_lsack_packet *pk;
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u16 len, i = 0;
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struct ospf_lsa_header *h;
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struct lsah_n *no;
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struct ospf_iface *ifa = n->ifa;
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struct proto *p = &n->ifa->oa->po->proto;
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if (EMPTY_LIST(n->ackl[queue]))
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return;
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pk = (struct ospf_lsack_packet *) ifa->sk->tbuf;
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op = (struct ospf_packet *) ifa->sk->tbuf;
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ospf_pkt_fill_hdr(n->ifa, pk, LSACK_P);
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h = pk->lsh;
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while (!EMPTY_LIST(n->ackl[queue]))
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{
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no = (struct lsah_n *) HEAD(n->ackl[queue]);
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memcpy(h + i, &no->lsa, sizeof(struct ospf_lsa_header));
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DBG("Iter %u ID: %R, RT: %R, Type: %04x\n", i, ntohl((h + i)->id),
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ntohl((h + i)->rt), (h + i)->type);
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i++;
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rem_node(NODE no);
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mb_free(no);
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if ((i * sizeof(struct ospf_lsa_header) +
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sizeof(struct ospf_lsack_packet)) > ospf_pkt_maxsize(n->ifa))
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{
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if (!EMPTY_LIST(n->ackl[queue]))
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{
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len =
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sizeof(struct ospf_lsack_packet) +
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i * sizeof(struct ospf_lsa_header);
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op->length = htons(len);
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DBG("Sending and continuing! Len=%u\n", len);
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OSPF_PACKET(ospf_dump_lsack, (struct ospf_lsack_packet *) ifa->sk->tbuf,
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"LSACK packet sent via %s", ifa->iface->name);
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if (ifa->type == OSPF_IT_BCAST)
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{
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if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
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ospf_send_to(ifa, AllSPFRouters);
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else
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ospf_send_to(ifa, AllDRouters);
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}
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else
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{
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if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
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ospf_send_to_agt(ifa, NEIGHBOR_EXCHANGE);
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else
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ospf_send_to_bdr(ifa);
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}
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ospf_pkt_fill_hdr(n->ifa, pk, LSACK_P);
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i = 0;
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}
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}
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}
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len = sizeof(struct ospf_lsack_packet) + i * sizeof(struct ospf_lsa_header);
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op->length = htons(len);
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DBG("Sending! Len=%u\n", len);
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OSPF_PACKET(ospf_dump_lsack, (struct ospf_lsack_packet *) ifa->sk->tbuf,
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"LSACK packet sent via %s", ifa->iface->name);
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if (ifa->type == OSPF_IT_BCAST)
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{
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if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
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ospf_send_to(ifa, AllSPFRouters);
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else
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ospf_send_to(ifa, AllDRouters);
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}
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else
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ospf_send_to_agt(ifa, NEIGHBOR_EXCHANGE);
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}
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void
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ospf_lsack_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
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struct ospf_neighbor *n)
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{
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struct proto *p = &ifa->oa->po->proto;
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struct ospf_lsa_header lsa;
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struct top_hash_entry *en;
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unsigned int i, lsano;
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unsigned int size = ntohs(ps_i->length);
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if (size < sizeof(struct ospf_lsack_packet))
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{
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log(L_ERR "Bad OSPF LSACK packet from %I - too short (%u B)", n->ip, size);
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return;
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}
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struct ospf_lsack_packet *ps = (void *) ps_i;
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OSPF_PACKET(ospf_dump_lsack, ps, "LSACK packet received from %I via %s", n->ip, ifa->iface->name);
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ospf_neigh_sm(n, INM_HELLOREC);
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if (n->state < NEIGHBOR_EXCHANGE)
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return;
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lsano = (size - sizeof(struct ospf_lsack_packet)) /
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sizeof(struct ospf_lsa_header);
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for (i = 0; i < lsano; i++)
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{
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ntohlsah(ps->lsh + i, &lsa);
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u32 dom = ospf_lsa_domain(lsa.type, n->ifa);
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if ((en = ospf_hash_find_header(n->lsrth, dom, &lsa)) == NULL)
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continue; /* pg 155 */
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if (lsa_comp(&lsa, &en->lsa) != CMP_SAME) /* pg 156 */
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{
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if ((lsa.sn == LSA_MAXSEQNO) && (lsa.age == LSA_MAXAGE))
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continue;
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OSPF_TRACE(D_PACKETS, "Strange LSACK from %I", n->ip);
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OSPF_TRACE(D_PACKETS, "Type: %04x, Id: %R, Rt: %R",
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lsa.type, lsa.id, lsa.rt);
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OSPF_TRACE(D_PACKETS, "I have: Age: %4u, Seq: %08x, Sum: %04x",
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en->lsa.age, en->lsa.sn, en->lsa.checksum);
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OSPF_TRACE(D_PACKETS, "He has: Age: %4u, Seq: %08x, Sum: %04x",
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lsa.age, lsa.sn, lsa.checksum);
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continue;
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}
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DBG("Deleting LS Id: %R RT: %R Type: %u from LS Retl for neighbor %R\n",
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lsa.id, lsa.rt, lsa.type, n->rid);
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s_rem_node(SNODE en);
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if (en->lsa_body != NULL)
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mb_free(en->lsa_body);
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en->lsa_body = NULL;
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ospf_hash_delete(n->lsrth, en);
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}
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}
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