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bc591061f6
As specified in RFC 2328 8.1: "On physical point-to-point networks, the IP destination is always set to the address AllSPFRouters." Note that this likely break setups with multiple neighbors on a network configured as PtP, which worked before. These should be configured as PtMP. Thanks to Senthil Kumar Nagappan for the original patch and to Joakim Tjernlund for suggestions.
147 lines
3.5 KiB
C
147 lines
3.5 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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* (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2009--2014 CZ.NIC z.s.p.o.
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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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/*
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struct ospf_lsreq_packet
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{
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struct ospf_packet hdr;
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// union ospf_auth auth;
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struct ospf_lsreq_header lsrs[];
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};
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*/
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static inline void
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ospf_lsreq_body(struct ospf_proto *p, struct ospf_packet *pkt,
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struct ospf_lsreq_header **body, uint *count)
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{
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uint plen = ntohs(pkt->length);
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uint hlen = ospf_pkt_hdrlen(p);
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*body = ((void *) pkt) + hlen;
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*count = (plen - hlen) / sizeof(struct ospf_lsreq_header);
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}
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static void
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ospf_dump_lsreq(struct ospf_proto *p, struct ospf_packet *pkt)
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{
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struct ospf_lsreq_header *lsrs;
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uint i, lsr_count;
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ASSERT(pkt->type == LSREQ_P);
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ospf_dump_common(p, pkt);
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ospf_lsreq_body(p, pkt, &lsrs, &lsr_count);
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for (i = 0; i < lsr_count; i++)
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log(L_TRACE "%s: LSR Type: %04x, Id: %R, Rt: %R", p->p.name,
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ntohl(lsrs[i].type), ntohl(lsrs[i].id), ntohl(lsrs[i].rt));
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}
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void
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ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n)
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{
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struct ospf_iface *ifa = n->ifa;
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struct ospf_lsreq_header *lsrs;
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struct top_hash_entry *req;
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struct ospf_packet *pkt;
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uint i, lsr_max, length;
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/* RFC 2328 10.9 */
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/* ASSERT((n->state >= NEIGHBOR_EXCHANGE) && !EMPTY_SLIST(n->lsrql)); */
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pkt = ospf_tx_buffer(ifa);
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ospf_pkt_fill_hdr(ifa, pkt, LSREQ_P);
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ospf_lsreq_body(p, pkt, &lsrs, &lsr_max);
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i = 0;
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WALK_SLIST(req, n->lsrql)
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{
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if (i == lsr_max)
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break;
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DBG("Requesting %uth LSA: Type: %04u, ID: %R, RT: %R, SN: 0x%x, Age %u\n",
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i, req->lsa_type, req->lsa.id, req->lsa.rt, req->lsa.sn, req->lsa.age);
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u32 etype = lsa_get_etype(&req->lsa, p);
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lsrs[i].type = htonl(etype);
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lsrs[i].rt = htonl(req->lsa.rt);
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lsrs[i].id = htonl(req->lsa.id);
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i++;
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}
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/* We store the position to see whether requested LSAs have been received */
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n->lsrqi = req;
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length = ospf_pkt_hdrlen(p) + i * sizeof(struct ospf_lsreq_header);
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pkt->length = htons(length);
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OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet sent to nbr %R on %s", n->rid, ifa->ifname);
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ospf_send_to_nbr(ifa, n);
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}
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void
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ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa,
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struct ospf_neighbor *n)
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{
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struct ospf_proto *p = ifa->oa->po;
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struct ospf_lsreq_header *lsrs;
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uint i, lsr_count;
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/* RFC 2328 10.7 */
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/* No need to check length, lsreq has only basic header */
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OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet received from nbr %R on %s", n->rid, ifa->ifname);
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if (n->state < NEIGHBOR_EXCHANGE)
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{
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OSPF_TRACE(D_PACKETS, "LSREQ packet ignored - lesser state than Exchange");
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return;
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}
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ospf_neigh_sm(n, INM_HELLOREC); /* Not in RFC */
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ospf_lsreq_body(p, pkt, &lsrs, &lsr_count);
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struct top_hash_entry *en, *entries[lsr_count];
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for (i = 0; i < lsr_count; i++)
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{
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u32 id, rt, type, domain;
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id = ntohl(lsrs[i].id);
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rt = ntohl(lsrs[i].rt);
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lsa_get_type_domain_(ntohl(lsrs[i].type), id, ifa, &type, &domain);
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DBG("Processing requested LSA: Type: %04x, Id: %R, Rt: %R\n", type, id, rt);
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en = ospf_hash_find(p->gr, domain, id, rt, type);
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if (!en)
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{
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LOG_LSA1("Bad LSR (Type: %04x, Id: %R, Rt: %R) in LSREQ", type, id, rt);
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LOG_LSA2(" received from nbr %R on %s - LSA is missing", n->rid, ifa->ifname);
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ospf_neigh_sm(n, INM_BADLSREQ);
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return;
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}
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entries[i] = en;
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}
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ospf_send_lsupd(p, entries, lsr_count, n);
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}
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