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650 lines
16 KiB
C
650 lines
16 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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/*
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struct ospf_lsupd_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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u32 lsa_count;
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void lsas[];
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};
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*/
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/* Beware of unaligned access */
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void ospf_dump_lsahdr(struct proto_ospf *po, struct ospf_lsa_header *lsa_n)
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{
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struct ospf_lsa_header lsa;
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u32 lsa_type;
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lsa_ntoh_hdr(lsa_n, &lsa);
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lsa_type = lsa_get_type(po, lsa.type_raw);
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log(L_TRACE "%s: LSA Type: %04x, Id: %R, Rt: %R, Age: %u, Seq: %08x, Sum: %04x",
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po->proto.name, lsa_type, lsa.id, lsa.rt, lsa.age, lsa.sn, lsa.checksum);
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}
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void ospf_dump_common(struct proto_ospf *po, struct ospf_packet *pkt)
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{
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struct proto *p = &po->proto;
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log(L_TRACE "%s: length %d", p->name, ntohs(pkt->length));
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log(L_TRACE "%s: router %R", p->name, ntohl(pkt->routerid));
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}
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static inline unsigned
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ospf_lsupd_hdrlen(struct proto_ospf *po)
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{
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return ospf_pkt_hdrlen(po) + 4; /* + u32 lsa count field */
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}
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static inline u32
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ospf_lsupd_get_lsa_count(struct ospf_packet *pkt, unsigned hdrlen)
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{
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u32 *c = ((void *) pkt) + hdrlen - 4;
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return ntohl(*c);
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}
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static inline void
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ospf_lsupd_set_lsa_count(struct ospf_packet *pkt, unsigned hdrlen, u32 val)
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{
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u32 *c = ((void *) pkt) + hdrlen - 4;
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*c = htonl(val);
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}
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static inline void
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ospf_lsupd_body(struct proto_ospf *po, struct ospf_packet *pkt,
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unsigned *offset, unsigned *bound, unsigned *lsa_count)
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{
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unsigned hlen = ospf_lsupd_hdrlen(po);
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*offset = hlen;
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*bound = ntohs(pkt->length) - sizeof(struct ospf_lsa_header);
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*lsa_count = ospf_lsupd_get_lsa_count(pkt, hlen);
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}
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static void ospf_lsupd_dump(struct proto_ospf *po, struct ospf_packet *pkt)
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{
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struct proto *p = &po->proto;
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ASSERT(pkt->type == LSUPD_P);
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ospf_dump_common(po, pkt);
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/* We know that ntohs(pkt->length) >= sizeof(struct ospf_lsa_header) */
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unsigned offset, bound, i, lsa_count, lsalen;
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ospf_lsupd_body(po, pkt, &offset, &bound, &lsa_count);
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for (i = 0; i < lsa_count; i++)
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{
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if (offset > bound)
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{
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log(L_TRACE "%s: LSA invalid", p->name);
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return;
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}
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struct ospf_lsa_header *lsa = ((void *) pkt) + offset;
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ospf_dump_lsahdr(po, lsa);
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lsalen = ntohs(lsa->length);
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offset += lsalen;
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if (((lsalen % 4) != 0) || (lsalen <= sizeof(struct ospf_lsa_header)))
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{
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log(L_TRACE "%s: LSA invalid", p->name);
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return;
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}
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}
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}
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static inline void
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ospf_lsa_lsrt_up(struct top_hash_entry *en, struct ospf_neighbor *n)
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{
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struct top_hash_entry *ret = ospf_hash_get_entry(n->lsrth, en);
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if (! ospf_hash_is_new(ret))
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s_rem_node(SNODE ret);
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s_add_tail(&n->lsrtl, SNODE ret);
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memcpy(&ret->lsa, &en->lsa, sizeof(struct ospf_lsa_header));
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}
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static inline int
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ospf_lsa_lsrt_down(struct top_hash_entry *en, struct ospf_neighbor *n)
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{
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struct top_hash_entry *ret = ospf_hash_find_entry(n->lsrth, en);
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if (ret)
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{
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s_rem_node(SNODE ret);
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ospf_hash_delete(n->lsrth, ret);
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return 1;
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}
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return 0;
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}
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static void ospf_lsupd_flood_ifa(struct proto_ospf *po, struct ospf_iface *ifa, struct top_hash_entry *en);
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static inline int
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ospf_addr_is_local(struct proto_ospf *po, struct ospf_area *oa, ip_addr ip)
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{
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struct ospf_iface *ifa;
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WALK_LIST(ifa, po->iface_list)
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if ((ifa->oa == oa) && ifa->addr && ipa_equal(ifa->addr->ip, ip))
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return 1;
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return 0;
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}
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static void
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ospf_lsupd_handle_self_originated_lsa()
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{
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// XXXX
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/* 13. (5a) - handle MinLSArrival timeout */
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/* pg 145 (5f) - premature aging of self originated lsa */
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/*
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if ((lsa.age == LSA_MAXAGE) && (lsa.sn == LSA_MAXSEQNO))
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{
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ospf_lsack_enqueue(n, lsa_n, ACKL_DIRECT);
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return;
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}
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OSPF_TRACE(D_EVENTS, "Received old self-originated LSA (Type: %04x, Id: %R, Rt: %R)",
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lsa_type, lsa.id, lsa.rt);
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if (en)
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{
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OSPF_TRACE(D_EVENTS, "Reflooding new self-originated LSA with newer sequence number");
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en->lsa.sn = lsa.sn + 1;
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en->lsa.age = 0;
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en->inst_t = now;
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en->ini_age = 0;
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lsasum_calculate(&en->lsa, en->lsa_body);
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ospf_lsupd_flood(po, NULL, NULL, &en->lsa, lsa_domain, 1);
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}
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else
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{
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OSPF_TRACE(D_EVENTS, "Premature aging it");
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lsa.age = LSA_MAXAGE;
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lsa.sn = LSA_MAXSEQNO;
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lsa_n->age = htons(LSA_MAXAGE);
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lsa_n->sn = htonl(LSA_MAXSEQNO);
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lsasum_check(lsa_n, (lsa_n + 1)); */ /* It also calculates chsum! */ /*
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lsa.checksum = ntohs(lsa_n->checksum);
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ospf_lsupd_flood(po, NULL, lsa_n, &lsa, lsa_domain, 0);
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}
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*/
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}
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void
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ospf_lsupd_receive(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 proto_ospf *po = ifa->oa->po;
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struct proto *p = &po->proto;
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unsigned sendreq = 1; /* XXXX ?? */
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unsigned plen = ntohs(pkt->length);
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if (plen < (ospf_lsupd_hdrlen(po) + sizeof(struct ospf_lsa_header)))
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{
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log(L_ERR "OSPF: Bad LSUPD packet from %I - too short (%u B)", n->ip, plen);
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return;
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}
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OSPF_PACKET(ospf_lsupd_dump, pkt, "LSUPD packet received from %I via %s", n->ip, ifa->iface->name);
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if (n->state < NEIGHBOR_EXCHANGE)
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{
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OSPF_TRACE(D_PACKETS, "Received lsupd in lesser state than EXCHANGE from (%I)", n->ip);
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return;
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}
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ospf_neigh_sm(n, INM_HELLOREC); /* Questionable */
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unsigned offset, bound, i, lsa_count;
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ospf_lsupd_body(po, pkt, &offset, &bound, &lsa_count);
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for (i = 0; i < lsa_count; i++)
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{
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struct ospf_lsa_header lsa, *lsa_n;
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struct top_hash_entry *en;
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u32 lsa_len, lsa_type, lsa_domain;
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if (offset > bound)
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{
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log(L_WARN "OSPF: Received LSUPD from %I is too short", n->ip);
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ospf_neigh_sm(n, INM_BADLSREQ);
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return;
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}
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/* LSA header in network order */
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lsa_n = ((void *) pkt) + offset;
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lsa_len = ntohs(lsa_n->length);
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offset += lsa_len;
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if ((offset > plen) || ((lsa_len % 4) != 0) ||
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(lsa_len <= sizeof(struct ospf_lsa_header)))
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{
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log(L_WARN "%s: Received LSA from %I with bad length", p->name, n->ip);
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ospf_neigh_sm(n, INM_BADLSREQ);
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break;
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}
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/* RFC 2328 13. (1) - validate LSA checksum */
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u16 chsum = lsa_n->checksum;
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if (chsum != lsasum_check(lsa_n, NULL))
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{
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log(L_WARN "%s: Received LSA from %I with bad checskum: %x %x",
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p->name, n->ip, chsum, lsa_n->checksum);
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continue;
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}
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/* LSA header in host order */
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lsa_ntoh_hdr(lsa_n, &lsa);
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lsa_xxxxtype(lsa.type_raw, ifa, &lsa_type, &lsa_domain);
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DBG("Update Type: %04x, Id: %R, Rt: %R, Sn: 0x%08x, Age: %u, Sum: %u\n",
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lsa_type, lsa.id, lsa.rt, lsa.sn, lsa.age, lsa.checksum);
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/* RFC 2328 13. (2) */
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if (!lsa_type)
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{
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log(L_WARN "%s: Received unknown LSA type from %I", p->name, n->ip);
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continue;
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}
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/* RFC 5340 4.5.1 (2) and RFC 2328 13. (3) */
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if ((LSA_SCOPE(lsa_type) == LSA_SCOPE_AS) && !oa_is_ext(ifa->oa))
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{
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log(L_WARN "%s: Received LSA with AS scope in stub area from %I", p->name, n->ip);
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continue;
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}
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/* RFC 5340 4.5.1 (3) */
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if (LSA_SCOPE(lsa_type) == LSA_SCOPE_RES)
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{
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log(L_WARN "%s: Received LSA with invalid scope from %I", p->name, n->ip);
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continue;
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}
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/* Find local copy of LSA in link state database */
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en = ospf_hash_find(po->gr, lsa_domain, lsa.id, lsa.rt, lsa_type);
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#ifdef LOCAL_DEBUG
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if (en)
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DBG("I have Type: %04x, Id: %R, Rt: %R, Sn: 0x%08x, Age: %u, Sum: %u\n",
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en->lsa_type, en->lsa.id, en->lsa.rt, en->lsa.sn, en->lsa.age, en->lsa.checksum);
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#endif
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/* 13. (4) - ignore maxage LSA if i have no local copy */
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if ((lsa.age == LSA_MAXAGE) && !en && can_flush_lsa(po))
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{
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/* 13.5. - schedule ACKs (tbl 19, case 5) */
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ospf_lsack_enqueue(n, lsa_n, ACKL_DIRECT);
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continue;
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}
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/* 13. (5) - received LSA is newer (or no local copy) */
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if (!en || (lsa_comp(&lsa, &en->lsa) == CMP_NEWER))
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{
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/* 13. (5f) - handle self-originated LSAs, see also 13.4. */
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if ((lsa.rt == po->router_id) ||
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(ospf_is_v2(po) && (lsa_type == LSA_T_NET) && ospf_addr_is_local(po, ifa->oa, ipa_from_u32(lsa.id))))
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{
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ospf_lsupd_handle_self_originated_lsa();
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continue;
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}
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/* 13. (5a) - enforce minimum time between updates */
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/* Note that en was received via flooding, because local LSAs are handled above */
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if (en && ((now - en->inst_t) <= MINLSARRIVAL))
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{
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OSPF_TRACE(D_EVENTS, "Skipping LSA received in less that MinLSArrival");
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sendreq = 0;
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continue;
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}
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/* 13. (5c) - remove old LSA from all retransmission lists */
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/* Must be done before (5b), otherwise it also removes the new entries from (5b) */
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if (en)
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{
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struct ospf_iface *ifi;
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struct ospf_neighbor *ni;
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WALK_LIST(ifi, po->iface_list)
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WALK_LIST(ni, ifi->neigh_list)
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if (ni->state > NEIGHBOR_EXSTART)
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ospf_lsa_lsrt_down(en, ni);
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}
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/* 13. (5d) - install new LSA into database */
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int blen = lsa.length - sizeof(struct ospf_lsa_header);
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void *body = mb_alloc(p->pool, blen);
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lsa_ntoh_body(lsa_n + 1, body, blen);
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en = ospf_install_lsa(po, &lsa, lsa_domain, body);
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/*
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XXXX
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if (lsa_validate(&lsa, lsa_type, ospf_is_v2(po), body) == 0)
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{
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log(L_WARN "Received invalid LSA from %I", n->ip);
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mb_free(body);
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continue;
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}
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*/
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/* 13. (5b) - flood new LSA */
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int flood_back = ospf_lsupd_flood(po, en, n);
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/* 13.5. - schedule ACKs (tbl 19, cases 1+2) */
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if (! flood_back)
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if ((ifa->state != OSPF_IS_BACKUP) || (n->rid == ifa->drid))
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ospf_lsack_enqueue(n, lsa_n, ACKL_DELAY);
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/* RFC 5340 4.4.3. events 6+7 */
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if ((lsa_type == LSA_T_LINK) && (ifa->state == OSPF_IS_DR))
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schedule_net_lsa(ifa);
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continue;
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}
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/* FIXME pg145 (6) */
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/* 13. (7) - received LSA is same */
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if (lsa_comp(&lsa, &en->lsa) == CMP_SAME)
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{
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/* Duplicate LSA, treat as implicit ACK */
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int implicit_ack = ospf_lsa_lsrt_down(en, n);
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/* 13.5. - schedule ACKs (tbl 19, cases 3+4) */
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if (implicit_ack)
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{
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if ((ifa->state == OSPF_IS_BACKUP) && (n->rid == ifa->drid))
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ospf_lsack_enqueue(n, lsa_n, ACKL_DELAY);
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}
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else
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ospf_lsack_enqueue(n, lsa_n, ACKL_DIRECT);
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sendreq = 0;
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continue;
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}
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/* 13. (8) - received LSA is older */
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{
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/* Seqnum is wrapping, wait until it is flushed */
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if ((en->lsa.age == LSA_MAXAGE) && (en->lsa.sn == LSA_MAXSEQNO))
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continue;
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/* Send newer local copy back to neighbor */
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/* FIXME - check for MinLSArrival ? */
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ospf_lsupd_send(n, &en, 1);
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}
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}
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/* Send direct LSAs */
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ospf_lsack_send(n, ACKL_DIRECT);
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if (sendreq && (n->state == NEIGHBOR_LOADING))
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{
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ospf_lsreq_send(n); /* Ask for another part of neighbor's database */
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}
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}
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/**
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* ospf_lsupd_flood - send received or generated LSA to the neighbors
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* @po: OSPF protocol
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* @en: LSA entry
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* @from: neighbor than sent this LSA (or NULL if LSA is local)
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*
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* return value - was the LSA flooded back?
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*/
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int
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ospf_lsupd_flood(struct proto_ospf *po, struct top_hash_entry *en, struct ospf_neighbor *from)
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{
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struct ospf_iface *ifa;
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struct ospf_neighbor *n;
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int back = 0;
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WALK_LIST(ifa, po->iface_list)
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{
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if (ifa->stub)
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continue;
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if (! lsa_flooding_allowed(en->lsa_type, en->domain, ifa))
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continue;
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DBG("Wanted to flood LSA: Type: %u, ID: %R, RT: %R, SN: 0x%x, Age %u\n",
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hh->type, hh->id, hh->rt, hh->sn, hh->age);
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int used = 0;
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WALK_LIST(n, ifa->neigh_list)
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{
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/* 13.3 (1a) */
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if (n->state < NEIGHBOR_EXCHANGE)
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continue;
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/* 13.3 (1b) */
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if (n->state < NEIGHBOR_FULL)
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{
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struct top_hash_entry *req = ospf_hash_find_entry(n->lsrqh, en);
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if (req != NULL)
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{
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int cmp = lsa_comp(&en->lsa, &req->lsa);
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/* If same or newer, remove LSA from the link state request list */
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if (cmp > CMP_OLDER)
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{
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s_rem_node(SNODE req);
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ospf_hash_delete(n->lsrqh, req);
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if ((EMPTY_SLIST(n->lsrql)) && (n->state == NEIGHBOR_LOADING))
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ospf_neigh_sm(n, INM_LOADDONE);
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}
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/* If older or same, skip processing of this LSA */
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if (cmp < CMP_NEWER)
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continue;
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}
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}
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/* 13.3 (1c) */
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if (n == from)
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continue;
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/* In OSPFv3, there should be check whether receiving router understand
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that type of LSA (for LSA types with U-bit == 0). But as we do not support
|
|
any optional LSA types, this is not needed yet */
|
|
|
|
/* 13.3 (1d) - add LSA to the link state retransmission list */
|
|
ospf_lsa_lsrt_up(en, n);
|
|
|
|
used = 1;
|
|
}
|
|
|
|
/* 13.3 (2) */
|
|
if (!used)
|
|
continue;
|
|
|
|
if (from && (from->ifa == ifa))
|
|
{
|
|
/* 13.3 (3) */
|
|
if ((from->rid == ifa->drid) || from->rid == ifa->bdrid)
|
|
continue;
|
|
|
|
/* 13.3 (4) */
|
|
if (ifa->state == OSPF_IS_BACKUP)
|
|
continue;
|
|
|
|
back = 1;
|
|
}
|
|
|
|
/* 13.3 (5) - finally flood the packet */
|
|
ospf_lsupd_flood_ifa(po, ifa, en);
|
|
}
|
|
|
|
return back;
|
|
}
|
|
|
|
static int
|
|
ospf_lsupd_prepare(struct proto_ospf *po, struct ospf_iface *ifa,
|
|
struct top_hash_entry **lsa_list, unsigned lsa_count)
|
|
{
|
|
struct ospf_packet *pkt;
|
|
unsigned hlen, pos, i, maxsize;
|
|
|
|
pkt = ospf_tx_buffer(ifa);
|
|
hlen = ospf_lsupd_hdrlen(po);
|
|
maxsize = ospf_pkt_maxsize(ifa);
|
|
|
|
ospf_pkt_fill_hdr(ifa, pkt, LSUPD_P);
|
|
pos = hlen;
|
|
|
|
for (i = 0; i < lsa_count; i++)
|
|
{
|
|
struct top_hash_entry *en = lsa_list[i];
|
|
unsigned len = en->lsa.length;
|
|
|
|
if ((pos + len) > maxsize)
|
|
{
|
|
/* The packet if full, stop adding LSAs and sent it */
|
|
if (i > 0)
|
|
break;
|
|
|
|
/* LSA is larger than MTU, check buffer size */
|
|
if ((pos + len) > ospf_pkt_bufsize(ifa))
|
|
{
|
|
/* Cannot fit in a tx buffer, skip that */
|
|
log(L_WARN "OSPF: LSA too large to send (Type: %04x, Id: %R, Rt: %R)",
|
|
en->lsa_type, en->lsa.id, en->lsa.rt);
|
|
XXXX();
|
|
continue;
|
|
}
|
|
}
|
|
|
|
struct ospf_lsa_header *buf = ((void *) pkt) + pos;
|
|
lsa_hton_hdr(&en->lsa, buf);
|
|
lsa_hton_body(en->lsa_body, ((void *) buf) + sizeof(struct ospf_lsa_header),
|
|
len - sizeof(struct ospf_lsa_header));
|
|
buf->age = htons(MIN(en->lsa.age + ifa->inftransdelay, LSA_MAXAGE));
|
|
|
|
pos += len;
|
|
}
|
|
|
|
ospf_lsupd_set_lsa_count(pkt, hlen, i);
|
|
pkt->length = htons(pos);
|
|
|
|
return i;
|
|
}
|
|
|
|
|
|
static void
|
|
ospf_lsupd_flood_ifa(struct proto_ospf *po, struct ospf_iface *ifa, struct top_hash_entry *en)
|
|
{
|
|
ospf_lsupd_prepare(po, ifa, &en, 1);
|
|
|
|
OSPF_PACKET(ospf_lsupd_dump, ospf_tx_buffer(ifa),
|
|
"LSUPD packet flooded via %s", ifa->iface->name);
|
|
|
|
switch (ifa->type)
|
|
{
|
|
case OSPF_IT_BCAST:
|
|
if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR))
|
|
ospf_send_to_all(ifa);
|
|
else
|
|
ospf_send_to_des(ifa);
|
|
break;
|
|
|
|
case OSPF_IT_NBMA:
|
|
if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR))
|
|
ospf_send_to_agt(ifa, NEIGHBOR_EXCHANGE);
|
|
else
|
|
ospf_send_to_bdr(ifa);
|
|
break;
|
|
|
|
case OSPF_IT_PTP:
|
|
ospf_send_to_all(ifa);
|
|
break;
|
|
|
|
case OSPF_IT_PTMP:
|
|
ospf_send_to_agt(ifa, NEIGHBOR_EXCHANGE);
|
|
break;
|
|
|
|
case OSPF_IT_VLINK:
|
|
ospf_send_to(ifa, ifa->vip);
|
|
break;
|
|
|
|
default:
|
|
bug("Bug in ospf_lsupd_flood()");
|
|
}
|
|
}
|
|
|
|
int
|
|
ospf_lsupd_send(struct ospf_neighbor *n, struct top_hash_entry **lsa_list, unsigned lsa_count)
|
|
{
|
|
struct ospf_iface *ifa = n->ifa;
|
|
struct proto_ospf *po = ifa->oa->po;
|
|
unsigned i, c;
|
|
|
|
for (i = 0; i < lsa_count; i += c)
|
|
{
|
|
c = ospf_lsupd_prepare(po, ifa, lsa_list + i, lsa_count - i);
|
|
|
|
OSPF_PACKET(ospf_lsupd_dump, ospf_tx_buffer(ifa),
|
|
"LSUPD packet sent to %I via %s", n->ip, ifa->iface->name);
|
|
|
|
ospf_send_to(ifa, n->ip);
|
|
}
|
|
|
|
return lsa_count;
|
|
}
|
|
|
|
void
|
|
ospf_lsupd_rxmt(struct ospf_neighbor *n)
|
|
{
|
|
struct proto_ospf *po = n->ifa->oa->po;
|
|
|
|
const unsigned max = 128;
|
|
struct top_hash_entry *entries[max];
|
|
struct top_hash_entry *ret, *en;
|
|
unsigned i = 0;
|
|
|
|
WALK_SLIST(ret, n->lsrtl)
|
|
{
|
|
en = ospf_hash_find_entry(po->gr, ret);
|
|
if (!en)
|
|
{
|
|
/* Probably flushed LSA, this should not happen */
|
|
log(L_WARN "%s: LSA disappeared (Type: %04x, Id: %R, Rt: %R)",
|
|
po->proto.name, ret->lsa_type, ret->lsa.id, ret->lsa.rt);
|
|
|
|
XXXX(); /* remove entry */
|
|
continue;
|
|
}
|
|
|
|
entries[i] = en;
|
|
i++;
|
|
|
|
if (i == max)
|
|
break;
|
|
}
|
|
|
|
ospf_lsupd_send(n, entries, i);
|
|
}
|