545 lines
14 KiB
C
545 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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* flood_lsa - 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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flood_lsa(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
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struct ospf_lsa_header *hh, struct proto_ospf *po, 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 *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) 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) continue;
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if(ifa->oa->stub) 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)) continue;
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}
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else
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{
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if(ifa->oa!=oa) 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) 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) 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)) 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) 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)) ospf_neigh_sm(nn, INM_LOADDONE);
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break;
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default: bug("Bug in lsa_comp?");
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}
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}
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}
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if(nn==n) 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) 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) 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) continue; /* pg 150 (3) */
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if(iff->state==OSPF_IS_BACKUP) continue; /* pg 150 (4) */
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retval = 1; /* FIXME !!!!!!!!!!! */
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}
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{
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sock *sk;
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ip_addr to;
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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) sk=ifa->ip_sk;
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else 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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fill_ospf_pkt_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 ) age = LSA_MAXAGE;
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lh->age = htons(age);
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op->length=htons(len);
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ospf_pkt_finalize(ifa, op);
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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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sk_send_to_agt(sk ,len, ifa, NEIGHBOR_EXCHANGE);
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else sk_send_to_bdr(sk ,len, 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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sk_send_to(sk,len, AllSPFRouters, OSPF_PROTO);
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else sk_send_to(sk,len, AllDRouters, OSPF_PROTO);
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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_tx_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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u8 ii;
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u8 *jj=n->ifa->ip_sk->tbuf;
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if(EMPTY_LIST(*l)) 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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fill_ospf_pkt_hdr(n->ifa, pk, LSUPD_P);
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len=SIPH+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) 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))>n->ifa->iface->mtu)
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{
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pk->lsano=htonl(lsano);
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op->length=htons(len-SIPH);
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ospf_pkt_finalize(n->ifa, op);
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sk_send_to(n->ifa->ip_sk,len-SIPH, n->ip, OSPF_PROTO);
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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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fill_ospf_pkt_hdr(n->ifa, pk, LSUPD_P);
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len=SIPH+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-SIPH);
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ospf_pkt_finalize(n->ifa, op);
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OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", n->ip, lsano);
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sk_send_to(n->ifa->ip_sk,len-SIPH, n->ip, OSPF_PROTO);
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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, u16 size)
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{
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u32 area,nrid;
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struct ospf_neighbor *n,*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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u16 length;
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u8 i;
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int sendreq = 1;
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nrid=ntohl(ps->ospf_packet.routerid);
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if((n=find_neigh(ifa, nrid))==NULL)
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{
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OSPF_TRACE(D_PACKETS, "Received lsupd from unknown neighbor! (%I)",
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nrid);
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return ;
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}
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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)",
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n->ip);
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return;
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}
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if(size<=(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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int diff=((u8 *)lsa)-((u8 *)ps);
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u16 chsum, lenn = ntohs(lsa->length);
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if(((diff+sizeof(struct ospf_lsa_header))>=size) || ((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))||(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,po))
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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))==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),po); /* It also calculates chsum! */
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lsatmp.checksum=ntohs(lsa->checksum);
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flood_lsa(NULL,lsa,&lsatmp,po,NULL,oa,0);
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if(en=ospf_hash_find_header(oa->gr,&lsatmp))
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{
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flood_lsa(NULL,NULL,&en->lsa,po,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(flood_lsa(n,lsa,&lsatmp,po,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) ospf_lsack_enqueue(n, lsa, ACKL_DELAY);
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}
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else 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) 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(oa);
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continue;
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} /* FIXME lsack? */
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/* pg 144 (5d) */
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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_tx_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
|
|
net_flush_lsa(struct top_hash_entry *en, struct proto_ospf *po,
|
|
struct ospf_area *oa)
|
|
{
|
|
struct ospf_lsa_header *lsa=&en->lsa;
|
|
struct proto *p=&po->proto;
|
|
|
|
lsa->age=LSA_MAXAGE;
|
|
lsa->sn=LSA_MAXSEQNO;
|
|
lsasum_calculate(lsa,en->lsa_body,po);
|
|
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);
|
|
flood_lsa(NULL,NULL,lsa,po,NULL,oa,0);
|
|
}
|
|
|