/* * BIRD -- OSPF * * (c) 2000--2004 Ondrej Filip <feela@network.cz> * (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org> * (c) 2009--2014 CZ.NIC z.s.p.o. * * Can be freely distributed and used under the terms of the GNU GPL. */ #include "ospf.h" /* struct ospf_lsreq_packet { struct ospf_packet hdr; // union ospf_auth auth; struct ospf_lsreq_header lsrs[]; }; */ static inline void ospf_lsreq_body(struct ospf_proto *p, struct ospf_packet *pkt, struct ospf_lsreq_header **body, uint *count) { uint plen = ntohs(pkt->length); uint hlen = ospf_pkt_hdrlen(p); *body = ((void *) pkt) + hlen; *count = (plen - hlen) / sizeof(struct ospf_lsreq_header); } static void ospf_dump_lsreq(struct ospf_proto *p, struct ospf_packet *pkt) { struct ospf_lsreq_header *lsrs; uint i, lsr_count; ASSERT(pkt->type == LSREQ_P); ospf_dump_common(p, pkt); ospf_lsreq_body(p, pkt, &lsrs, &lsr_count); for (i = 0; i < lsr_count; i++) log(L_TRACE "%s: LSR Type: %04x, Id: %R, Rt: %R", p->p.name, ntohl(lsrs[i].type), ntohl(lsrs[i].id), ntohl(lsrs[i].rt)); } void ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n) { struct ospf_iface *ifa = n->ifa; struct ospf_lsreq_header *lsrs; struct top_hash_entry *req; struct ospf_packet *pkt; uint i, lsr_max, length; /* RFC 2328 10.9 */ /* ASSERT((n->state >= NEIGHBOR_EXCHANGE) && !EMPTY_SLIST(n->lsrql)); */ pkt = ospf_tx_buffer(ifa); ospf_pkt_fill_hdr(ifa, pkt, LSREQ_P); ospf_lsreq_body(p, pkt, &lsrs, &lsr_max); i = 0; WALK_SLIST(req, n->lsrql) { if (i == lsr_max) break; DBG("Requesting %uth LSA: Type: %04u, ID: %R, RT: %R, SN: 0x%x, Age %u\n", i, req->lsa_type, req->lsa.id, req->lsa.rt, req->lsa.sn, req->lsa.age); u32 etype = lsa_get_etype(&req->lsa, p); lsrs[i].type = htonl(etype); lsrs[i].rt = htonl(req->lsa.rt); lsrs[i].id = htonl(req->lsa.id); i++; } /* We store the position to see whether requested LSAs have been received */ n->lsrqi = req; length = ospf_pkt_hdrlen(p) + i * sizeof(struct ospf_lsreq_header); pkt->length = htons(length); OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet sent to nbr %R on %s", n->rid, ifa->ifname); ospf_send_to(ifa, n->ip); } void ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa, struct ospf_neighbor *n) { struct ospf_proto *p = ifa->oa->po; struct ospf_lsreq_header *lsrs; uint i, lsr_count; /* RFC 2328 10.7 */ /* No need to check length, lsreq has only basic header */ OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet received from nbr %R on %s", n->rid, ifa->ifname); if (n->state < NEIGHBOR_EXCHANGE) { OSPF_TRACE(D_PACKETS, "LSREQ packet ignored - lesser state than Exchange"); return; } ospf_neigh_sm(n, INM_HELLOREC); /* Not in RFC */ ospf_lsreq_body(p, pkt, &lsrs, &lsr_count); struct top_hash_entry *en, *entries[lsr_count]; for (i = 0; i < lsr_count; i++) { u32 id, rt, type, domain; id = ntohl(lsrs[i].id); rt = ntohl(lsrs[i].rt); lsa_get_type_domain_(ntohl(lsrs[i].type), ifa, &type, &domain); DBG("Processing requested LSA: Type: %04x, Id: %R, Rt: %R\n", type, id, rt); en = ospf_hash_find(p->gr, domain, id, rt, type); if (!en) { LOG_LSA1("Bad LSR (Type: %04x, Id: %R, Rt: %R) in LSREQ", type, id, rt); LOG_LSA2(" received from nbr %R on %s - LSA is missing", n->rid, ifa->ifname); ospf_neigh_sm(n, INM_BADLSREQ); return; } entries[i] = en; } ospf_send_lsupd(p, entries, lsr_count, n); }