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