/* * BIRD -- OSPF * * (c) 2000--2004 Ondrej Filip <feela@network.cz> * * Can be freely distributed and used under the terms of the GNU GPL. */ #include "ospf.h" /** * ospf_lsupd_flood - send received or generated lsa to the neighbors * @n: neighbor than sent this lsa (or NULL if generated) * @hn: LSA header followed by lsa body in network endianity (may be NULL) * @hh: LSA header in host endianity (must be filled) * @po: actual instance of OSPF protocol * @iff: interface which received this LSA (or NULL if LSA is generated) * @oa: ospf_area which is the LSA generated for * @rtl: add this LSA into retransmission list * * return value - was the LSA flooded back? */ int ospf_lsupd_flood(struct ospf_neighbor *n, struct ospf_lsa_header *hn, struct ospf_lsa_header *hh, struct ospf_iface *iff, struct ospf_area *oa, int rtl) { struct ospf_iface *ifa; struct ospf_neighbor *nn; struct top_hash_entry *en; struct proto_ospf *po = oa->po; struct proto *p = &po->proto; int ret, retval = 0; /* pg 148 */ WALK_LIST(NODE ifa, po->iface_list) { if (ifa->stub) continue; if (hh->type == LSA_T_EXT) { if (ifa->type == OSPF_IT_VLINK) continue; if (ifa->oa->stub) continue; } else { if (oa->areaid == BACKBONE) { if ((ifa->type != OSPF_IT_VLINK) && (ifa->oa != oa)) continue; } else { if (ifa->oa != oa) continue; } } ret = 0; WALK_LIST(NODE nn, ifa->neigh_list) { if (nn->state < NEIGHBOR_EXCHANGE) continue; if (nn->state < NEIGHBOR_FULL) { if ((en = ospf_hash_find_header(nn->lsrqh, hh)) != NULL) { switch (lsa_comp(hh, &en->lsa)) { case CMP_OLDER: continue; break; case CMP_SAME: s_rem_node(SNODE en); if (en->lsa_body != NULL) mb_free(en->lsa_body); en->lsa_body = NULL; DBG("Removing from lsreq list for neigh %I\n", nn->rid); ospf_hash_delete(nn->lsrqh, en); if (EMPTY_SLIST(nn->lsrql)) ospf_neigh_sm(nn, INM_LOADDONE); continue; break; case CMP_NEWER: s_rem_node(SNODE en); if (en->lsa_body != NULL) mb_free(en->lsa_body); en->lsa_body = NULL; DBG("Removing from lsreq list for neigh %I\n", nn->rid); ospf_hash_delete(nn->lsrqh, en); if (EMPTY_SLIST(nn->lsrql)) ospf_neigh_sm(nn, INM_LOADDONE); break; default: bug("Bug in lsa_comp?"); } } } if (nn == n) continue; if (rtl) { if ((en = ospf_hash_find_header(nn->lsrth, hh)) == NULL) { en = ospf_hash_get_header(nn->lsrth, hh); } else { s_rem_node(SNODE en); } s_add_tail(&nn->lsrtl, SNODE en); memcpy(&en->lsa, hh, sizeof(struct ospf_lsa_header)); DBG("Adding LSA lsrt RT: %I, Id: %I, Type: %u for n: %I\n", en->lsa.rt, en->lsa.id, en->lsa.type, nn->ip); } else { if ((en = ospf_hash_find_header(nn->lsrth, hh)) != NULL) { s_rem_node(SNODE en); if (en->lsa_body != NULL) mb_free(en->lsa_body); en->lsa_body = NULL; ospf_hash_delete(nn->lsrth, en); } } ret = 1; } if (ret == 0) continue; /* pg 150 (2) */ if (ifa == iff) { if ((n->rid == iff->drid) || n->rid == iff->bdrid) continue; /* pg 150 (3) */ if (iff->state == OSPF_IS_BACKUP) continue; /* pg 150 (4) */ retval = 1; } { sock *sk; u16 len, age; struct ospf_lsupd_packet *pk; struct ospf_packet *op; struct ospf_lsa_header *lh; if (ifa->type == OSPF_IT_NBMA) sk = ifa->ip_sk; else sk = ifa->hello_sk; /* FIXME is this true for PTP? */ pk = (struct ospf_lsupd_packet *) sk->tbuf; op = (struct ospf_packet *) sk->tbuf; fill_ospf_pkt_hdr(ifa, pk, LSUPD_P); pk->lsano = htonl(1); lh = (struct ospf_lsa_header *) (pk + 1); /* Copy LSA into the packet */ if (hn) { memcpy(lh, hn, ntohs(hn->length)); } else { u8 *help; struct top_hash_entry *en; htonlsah(hh, lh); help = (u8 *) (lh + 1); en = ospf_hash_find_header(oa->gr, hh); htonlsab(en->lsa_body, help, hh->type, hh->length - sizeof(struct ospf_lsa_header)); } len = sizeof(struct ospf_lsupd_packet) + ntohs(lh->length); age = ntohs(lh->age); age += ifa->inftransdelay; if (age > LSA_MAXAGE) age = LSA_MAXAGE; lh->age = htons(age); op->length = htons(len); ospf_pkt_finalize(ifa, op); OSPF_TRACE(D_PACKETS, "LS upd flooded via %s", ifa->iface->name); if (ifa->type == OSPF_IT_NBMA) { if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR)) ospf_send_to_agt(sk, len, ifa, NEIGHBOR_EXCHANGE); else ospf_send_to_bdr(sk, len, ifa); } else { if ((ifa->state == OSPF_IS_BACKUP) || (ifa->state == OSPF_IS_DR) || (ifa->type == OSPF_IT_PTP)) ospf_send_to(sk, len, AllSPFRouters); else ospf_send_to(sk, len, AllDRouters); } } } return retval; } void /* I send all I received in LSREQ */ ospf_lsupd_send_list(struct ospf_neighbor *n, list * l) { struct l_lsr_head *llsh; u16 len; u32 lsano; struct top_hash_entry *en; struct ospf_lsupd_packet *pk; struct ospf_packet *op; struct proto *p = &n->ifa->oa->po->proto; void *pktpos; if (EMPTY_LIST(*l)) return; pk = (struct ospf_lsupd_packet *) n->ifa->ip_sk->tbuf; op = (struct ospf_packet *) n->ifa->ip_sk->tbuf; DBG("LSupd: 1st packet\n"); fill_ospf_pkt_hdr(n->ifa, pk, LSUPD_P); len = SIPH + sizeof(struct ospf_lsupd_packet); lsano = 0; pktpos = (pk + 1); WALK_LIST(llsh, *l) { if ((en = ospf_hash_find(n->ifa->oa->gr, llsh->lsh.id, llsh->lsh.rt, llsh->lsh.type)) == NULL) continue; /* Probably flushed LSA */ DBG("Sending ID=%I, Type=%u, RT=%I Sn: 0x%x Age: %u\n", llsh->lsh.id, llsh->lsh.type, llsh->lsh.rt, en->lsa.sn, en->lsa.age); if (((u32) (len + en->lsa.length)) > n->ifa->iface->mtu) { pk->lsano = htonl(lsano); op->length = htons(len - SIPH); ospf_pkt_finalize(n->ifa, op); ospf_send_to(n->ifa->ip_sk, len - SIPH, n->ip); OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", n->ip, lsano); DBG("LSupd: next packet\n"); fill_ospf_pkt_hdr(n->ifa, pk, LSUPD_P); len = SIPH + sizeof(struct ospf_lsupd_packet); lsano = 0; pktpos = (pk + 1); } htonlsah(&(en->lsa), pktpos); pktpos = pktpos + sizeof(struct ospf_lsa_header); htonlsab(en->lsa_body, pktpos, en->lsa.type, en->lsa.length - sizeof(struct ospf_lsa_header)); pktpos = pktpos + en->lsa.length - sizeof(struct ospf_lsa_header); len += en->lsa.length; lsano++; } if (lsano > 0) { pk->lsano = htonl(lsano); op->length = htons(len - SIPH); ospf_pkt_finalize(n->ifa, op); OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", n->ip, lsano); ospf_send_to(n->ifa->ip_sk, len - SIPH, n->ip); } } void ospf_lsupd_receive(struct ospf_lsupd_packet *ps, struct ospf_iface *ifa, struct ospf_neighbor *n) { u32 area; struct ospf_neighbor *ntmp; struct ospf_lsa_header *lsa; struct ospf_area *oa; struct proto_ospf *po = ifa->proto; struct proto *p = (struct proto *) po; unsigned int i, sendreq = 1, size = ntohs(ps->ospf_packet.length); if (n->state < NEIGHBOR_EXCHANGE) { OSPF_TRACE(D_PACKETS, "Received lsupd in lesser state than EXCHANGE from (%I)", n->ip); return; } if (size <= (sizeof(struct ospf_lsupd_packet) + sizeof(struct ospf_lsa_header))) { log(L_WARN "Received lsupd from %I is too short!", n->ip); return; } OSPF_TRACE(D_PACKETS, "Received LS upd from %I", n->ip); ospf_neigh_sm(n, INM_HELLOREC); /* Questionable */ lsa = (struct ospf_lsa_header *) (ps + 1); area = htonl(ps->ospf_packet.areaid); oa = ospf_find_area((struct proto_ospf *) p, area); for (i = 0; i < ntohl(ps->lsano); i++, lsa = (struct ospf_lsa_header *) (((u8 *) lsa) + ntohs(lsa->length))) { struct ospf_lsa_header lsatmp; struct top_hash_entry *lsadb; unsigned diff = ((u8 *) lsa) - ((u8 *) ps), lenn = ntohs(lsa->length); u16 chsum; if (((diff + sizeof(struct ospf_lsa_header)) >= size) || ((lenn + diff) > size)) { log(L_WARN "Received lsupd from %I is too short!", n->ip); ospf_neigh_sm(n, INM_BADLSREQ); break; } if ((lenn <= sizeof(struct ospf_lsa_header)) || (lenn != (4 * (lenn / 4)))) { log(L_WARN "Received LSA from %I with bad length", n->ip); ospf_neigh_sm(n, INM_BADLSREQ); break; } /* pg 143 (1) */ chsum = lsa->checksum; if (chsum != lsasum_check(lsa, NULL)) { log(L_WARN "Received bad lsa checksum from %I", n->ip); continue; } /* pg 143 (2) */ if ((lsa->type < LSA_T_RT) || (lsa->type > LSA_T_EXT)) { log(L_WARN "Unknown LSA type from %I", n->ip); continue; } /* pg 143 (3) */ if ((lsa->type == LSA_T_EXT) && oa->stub) { log(L_WARN "Received External LSA in stub area from %I", n->ip); continue; } ntohlsah(lsa, &lsatmp); DBG("Update Type: %u ID: %I RT: %I, Sn: 0x%08x Age: %u, Sum: %u\n", lsatmp.type, lsatmp.id, lsatmp.rt, lsatmp.sn, lsatmp.age, lsatmp.checksum); lsadb = ospf_hash_find_header(oa->gr, &lsatmp); #ifdef LOCAL_DEBUG if (lsadb) DBG("I have Type: %u ID: %I RT: %I, Sn: 0x%08x Age: %u, Sum: %u\n", lsadb->lsa.type, lsadb->lsa.id, lsadb->lsa.rt, lsadb->lsa.sn, lsadb->lsa.age, lsadb->lsa.checksum); #endif /* pg 143 (4) */ if ((lsatmp.age == LSA_MAXAGE) && (lsadb == NULL) && can_flush_lsa(oa)) { ospf_lsack_enqueue(n, lsa, ACKL_DIRECT); continue; } /* pg 144 (5) */ if ((lsadb == NULL) || (lsa_comp(&lsatmp, &lsadb->lsa) == CMP_NEWER)) { struct ospf_iface *ift = NULL; void *body; struct ospf_iface *nifa; int self = (lsatmp.rt == p->cf->global->router_id); DBG("PG143(5): Received LSA is newer\n"); /* pg 145 (5f) - premature aging of self originated lsa */ if ((!self) && (lsatmp.type == LSA_T_NET)) { WALK_LIST(nifa, po->iface_list) { if (ipa_compare(nifa->iface->addr->ip, ipa_from_u32(lsatmp.id)) == 0) { self = 1; break; } } } if (self) { struct top_hash_entry *en; if ((lsatmp.age == LSA_MAXAGE) && (lsatmp.sn == LSA_MAXSEQNO)) { ospf_lsack_enqueue(n, lsa, ACKL_DIRECT); continue; } lsatmp.age = LSA_MAXAGE; lsatmp.sn = LSA_MAXSEQNO; lsa->age = htons(LSA_MAXAGE); lsa->sn = htonl(LSA_MAXSEQNO); OSPF_TRACE(D_EVENTS, "Premature aging self originated lsa."); OSPF_TRACE(D_EVENTS, "Type: %d, Id: %I, Rt: %I", lsatmp.type, lsatmp.id, lsatmp.rt); lsasum_check(lsa, (lsa + 1)); /* It also calculates chsum! */ lsatmp.checksum = ntohs(lsa->checksum); ospf_lsupd_flood(NULL, lsa, &lsatmp, NULL, oa, 0); if (en = ospf_hash_find_header(oa->gr, &lsatmp)) { ospf_lsupd_flood(NULL, NULL, &en->lsa, NULL, oa, 1); } continue; } /* pg 144 (5a) */ if (lsadb && ((now - lsadb->inst_t) <= MINLSARRIVAL)) /* FIXME: test for flooding? */ { DBG("I got it in less that MINLSARRIVAL\n"); sendreq = 0; continue; } if (ospf_lsupd_flood(n, lsa, &lsatmp, ifa, ifa->oa, 1) == 0) { DBG("Wasn't flooded back\n"); /* ps 144(5e), pg 153 */ if (ifa->state == OSPF_IS_BACKUP) { if (ifa->drid == n->rid) ospf_lsack_enqueue(n, lsa, ACKL_DELAY); } else ospf_lsack_enqueue(n, lsa, ACKL_DELAY); } /* Remove old from all ret lists */ /* pg 144 (5c) */ if (lsadb) WALK_LIST(NODE ift, po->iface_list) WALK_LIST(NODE ntmp, ift->neigh_list) { struct top_hash_entry *en; if (ntmp->state > NEIGHBOR_EXSTART) if ((en = ospf_hash_find_header(ntmp->lsrth, &lsadb->lsa)) != NULL) { s_rem_node(SNODE en); if (en->lsa_body != NULL) mb_free(en->lsa_body); en->lsa_body = NULL; ospf_hash_delete(ntmp->lsrth, en); } } if ((lsatmp.age == LSA_MAXAGE) && (lsatmp.sn == LSA_MAXSEQNO) && lsadb && can_flush_lsa(oa)) { flush_lsa(lsadb, oa); schedule_rtcalc(po); continue; } /* FIXME lsack? */ /* pg 144 (5d) */ body = mb_alloc(p->pool, lsatmp.length - sizeof(struct ospf_lsa_header)); ntohlsab(lsa + 1, body, lsatmp.type, lsatmp.length - sizeof(struct ospf_lsa_header)); lsadb = lsa_install_new(&lsatmp, body, oa); DBG("New LSA installed in DB\n"); continue; } /* FIXME pg145 (6) */ /* pg145 (7) */ if (lsa_comp(&lsatmp, &lsadb->lsa) == CMP_SAME) { struct top_hash_entry *en; DBG("PG145(7) Got the same LSA\n"); if ((en = ospf_hash_find_header(n->lsrth, &lsadb->lsa)) != NULL) { /* pg145 (7a) */ s_rem_node(SNODE en); if (en->lsa_body != NULL) mb_free(en->lsa_body); en->lsa_body = NULL; ospf_hash_delete(n->lsrth, en); if (ifa->state == OSPF_IS_BACKUP) { if (n->rid == ifa->drid) ospf_lsack_enqueue(n, lsa, ACKL_DELAY); } } else { /* pg145 (7b) */ ospf_lsack_enqueue(n, lsa, ACKL_DIRECT); } sendreq = 0; continue; } /* pg145 (8) */ if ((lsadb->lsa.age == LSA_MAXAGE) && (lsadb->lsa.sn == LSA_MAXSEQNO)) { continue; } { list l; struct l_lsr_head ll; init_list(&l); ll.lsh.id = lsadb->lsa.id; ll.lsh.rt = lsadb->lsa.rt; ll.lsh.type = lsadb->lsa.type; add_tail(&l, NODE & ll); ospf_lsupd_send_list(n, &l); } } /* Send direct LSAs */ ospf_lsack_send(n, ACKL_DIRECT); if (sendreq && (n->state == NEIGHBOR_LOADING)) { ospf_lsreq_send(n); /* Ask for another part of neighbor's database */ } } void ospf_lsupd_flush_nlsa(struct top_hash_entry *en, struct ospf_area *oa) { struct ospf_lsa_header *lsa = &en->lsa; struct proto_ospf *po = oa->po; struct proto *p = &po->proto; lsa->age = LSA_MAXAGE; lsa->sn = LSA_MAXSEQNO; lsasum_calculate(lsa, en->lsa_body); OSPF_TRACE(D_EVENTS, "Premature aging self originated lsa!"); OSPF_TRACE(D_EVENTS, "Type: %d, Id: %I, Rt: %I", lsa->type, lsa->id, lsa->rt); ospf_lsupd_flood(NULL, NULL, lsa, NULL, oa, 0); }