146 lines
3.6 KiB
C
146 lines
3.6 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_lsreq_packet
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{
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struct ospf_packet ospf_packet;
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struct ospf_lsreq_header lsh[];
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};
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static void ospf_dump_lsreq(struct proto *p, struct ospf_lsreq_packet *pkt)
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{
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struct ospf_packet *op = &pkt->ospf_packet;
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ASSERT(op->type == LSREQ_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_lsreq_packet)) /
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sizeof(struct ospf_lsreq_header);
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for (i = 0; i < j; i++)
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log(L_TRACE "%s: LSR Type: %04x, Id: %R, Rt: %R", p->name,
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htonl(pkt->lsh[i].type), htonl(pkt->lsh[i].id), htonl(pkt->lsh[i].rt));
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}
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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->oa->po->proto;
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pk = ospf_tx_buffer(n->ifa);
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op = &pk->ospf_packet;
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ospf_pkt_fill_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 = (ospf_pkt_maxsize(n->ifa) - sizeof(struct ospf_lsreq_packet)) /
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sizeof(struct ospf_lsreq_header);
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lsh = pk->lsh;
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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->type = htonl(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: %R, RT: %R, SN: 0x%x, Age %u\n",
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i, en->lsa.type, en->lsa.id, en->lsa.rt, en->lsa.sn, en->lsa.age);
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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_PACKET(ospf_dump_lsreq, pk, "LSREQ packet sent to %I via %s", n->ip, n->ifa->iface->name);
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ospf_send_to(n->ifa, n->ip);
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}
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void
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ospf_lsreq_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 ospf_area *oa = ifa->oa;
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struct proto_ospf *po = oa->po;
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struct proto *p = &po->proto;
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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 i, lsano;
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unsigned int size = ntohs(ps_i->length);
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if (size < sizeof(struct ospf_lsreq_packet))
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{
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log(L_ERR "Bad OSPF LSREQ 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_lsreq_packet *ps = (void *) ps_i;
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OSPF_PACKET(ospf_dump_lsreq, ps, "LSREQ packet received from %I via %s", n->ip, ifa->iface->name);
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if (n->state < NEIGHBOR_EXCHANGE)
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return;
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ospf_neigh_sm(n, INM_HELLOREC);
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lsh = ps->lsh;
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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 = (size - 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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u32 hid = ntohl(lsh->id);
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u32 hrt = ntohl(lsh->rt);
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u32 htype = ntohl(lsh->type);
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u32 dom = ospf_lsa_domain(htype, ifa);
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DBG("Processing requested LSA: Type: %u, ID: %R, RT: %R\n", lsh->type, hid, hrt);
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llsh = sl_alloc(upslab);
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llsh->lsh.id = hid;
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llsh->lsh.rt = hrt;
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llsh->lsh.type = htype;
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add_tail(&uplist, NODE llsh);
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if (ospf_hash_find(po->gr, dom, hid, hrt, htype) == NULL)
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{
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log(L_WARN "Received bad LSREQ from %I: Type: %04x, Id: %R, Rt: %R",
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n->ip, htype, hid, hrt);
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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_send_list(n, &uplist);
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rfree(upslab);
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}
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