122 lines
3 KiB
C
122 lines
3 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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void
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ospf_lsreq_send(struct ospf_neighbor *n)
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{
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snode *sn;
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struct top_hash_entry *en;
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struct ospf_lsreq_packet *pk;
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struct ospf_packet *op;
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struct ospf_lsreq_header *lsh;
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u16 length;
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int i, j;
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struct proto *p = &n->ifa->proto->proto;
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pk = (struct ospf_lsreq_packet *) n->ifa->ip_sk->tbuf;
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op = (struct ospf_packet *) n->ifa->ip_sk->tbuf;
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fill_ospf_pkt_hdr(n->ifa, pk, LSREQ_P);
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sn = SHEAD(n->lsrql);
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if (EMPTY_SLIST(n->lsrql))
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{
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if (n->state == NEIGHBOR_LOADING)
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ospf_neigh_sm(n, INM_LOADDONE);
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return;
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}
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i = j = (n->ifa->iface->mtu - SIPH - sizeof(struct ospf_lsreq_packet)) /
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sizeof(struct ospf_lsreq_header);
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lsh = (struct ospf_lsreq_header *) (pk + 1);
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for (; i > 0; i--)
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{
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en = (struct top_hash_entry *) sn;
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lsh->padd1 = 0;
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lsh->padd2 = 0;
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lsh->type = en->lsa.type;
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lsh->rt = htonl(en->lsa.rt);
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lsh->id = htonl(en->lsa.id);
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DBG("Requesting %uth LSA: Type: %u, Id: %I, RT: %I\n", i, en->lsa.type,
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en->lsa.id, en->lsa.rt);
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lsh++;
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if (sn == STAIL(n->lsrql))
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break;
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sn = sn->next;
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}
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if (i != 0)
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i--;
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length =
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sizeof(struct ospf_lsreq_packet) + (j -
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i) * sizeof(struct ospf_lsreq_header);
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op->length = htons(length);
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ospf_pkt_finalize(n->ifa, op);
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sk_send_to(n->ifa->ip_sk, length, n->ip, OSPF_PROTO);
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OSPF_TRACE(D_PACKETS, "LS request sent to: %I", n->rid);
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}
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void
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ospf_lsreq_receive(struct ospf_lsreq_packet *ps,
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struct ospf_iface *ifa, u16 size)
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{
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u32 nrid;
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struct ospf_neighbor *n;
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struct ospf_lsreq_header *lsh;
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struct l_lsr_head *llsh;
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list uplist;
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slab *upslab;
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int length, i, lsano;
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struct proto *p = (struct proto *) ifa->proto;
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nrid = ntohl(ps->ospf_packet.routerid);
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if ((n = find_neigh(ifa, nrid)) == NULL)
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{
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OSPF_TRACE(D_PACKETS, "Received lsreq from unknown neighbor! (%I)", nrid);
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return;
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}
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if (n->state < NEIGHBOR_EXCHANGE)
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return;
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OSPF_TRACE(D_EVENTS, "Received LS req from neighbor: %I", n->ip);
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ospf_neigh_sm(n, INM_HELLOREC);
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length = ntohs(ps->ospf_packet.length);
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lsh = (void *) (ps + 1);
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init_list(&uplist);
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upslab = sl_new(n->pool, sizeof(struct l_lsr_head));
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lsano = (length - sizeof(struct ospf_lsreq_packet)) /
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sizeof(struct ospf_lsreq_header);
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for (i = 0; i < lsano; lsh++, i++)
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{
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DBG("Processing LSA: ID=%I, Type=%u, Router=%I\n", ntohl(lsh->id),
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lsh->type, ntohl(lsh->rt));
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llsh = sl_alloc(upslab);
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llsh->lsh.id = ntohl(lsh->id);
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llsh->lsh.rt = ntohl(lsh->rt);
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llsh->lsh.type = lsh->type;
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add_tail(&uplist, NODE llsh);
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if (ospf_hash_find(n->ifa->oa->gr, llsh->lsh.id, llsh->lsh.rt,
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llsh->lsh.type) == NULL)
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{
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log(L_WARN "Received bad LS req from: %I looking: RT: %I, ID: %I, Type: %u",
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n->ip, lsh->rt, lsh->id, lsh->type);
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ospf_neigh_sm(n, INM_BADLSREQ);
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rfree(upslab);
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return;
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}
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}
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ospf_lsupd_tx_list(n, &uplist);
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rfree(upslab);
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}
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