154 lines
2.9 KiB
C
154 lines
2.9 KiB
C
/*
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* BIRD -- OSPF
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*
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* (c) 2000 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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void
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ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
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{
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struct top_hash_entry *en;
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slab *sl;
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struct spf_n *cn;
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u32 i,*rts;
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/*
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* First of all, mark all vertices as they are not in SPF
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* Maybe I can join this work with Aging of structure
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*/
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WALK_SLIST(SNODE en, oa->lsal)
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{
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en->color=OUTSPF;
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en->dist=LSINFINITY;
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}
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init_list(&oa->cand); /* Empty list of candidates */
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oa->trcap=0;
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sl=sl_new(p->pool,sizeof(struct spf_n));
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cn=sl_alloc(sl);
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cn->en=oa->rt;
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oa->rt->dist=0;
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oa->rt->color=CANDIDATE;
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add_head(&oa->cand,NODE cn);
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while(!EMPTY_LIST(oa->cand))
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{
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struct top_hash_entry *act,*tmp;
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node *n;
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struct ospf_lsa_rt *rt;
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struct ospf_lsa_rt_link *rtl;
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struct ospf_lsa_net *net;
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n=HEAD(oa->cand);
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act=((struct spf_n *)n)->en;
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rem_node(n);
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sl_free(sl,n); /* Good idea? */
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act->color=INSPF;
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switch(act->lsa.type)
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{
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case LSA_T_RT:
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rt=(struct ospf_lsa_rt *)act->lsa_body;
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if((rt->VEB)&(1>>LSA_RT_V)) oa->trcap=1;
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rtl=(struct ospf_lsa_rt_link *)(rt+1);
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for(i=0;rt->links;i++)
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{
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tmp=NULL;
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switch((rtl+i)->type)
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{
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case LSART_STUB:
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case LSART_VLNK:
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continue;
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break;
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case LSART_NET:
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tmp=ospf_hash_find(oa->gr,rtl->data,rtl->id,LSA_T_RT);
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break;
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case LSART_PTP:
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tmp=ospf_hash_find(oa->gr,rtl->data,rtl->id,LSA_T_NET);
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break;
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default:
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log("Unknown link type in router lsa.\n");
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break;
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}
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add_cand(&oa->cand,tmp,act->dist+rtl->metric,sl);
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}
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break;
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case LSA_T_NET:
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net=(struct ospf_lsa_net *)act->lsa_body;
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rts=(u32 *)(net+1);
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for(i=0;i<(act->lsa.length-sizeof(struct ospf_lsa_header)-
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sizeof(struct ospf_lsa_net))/sizeof(u32);i++)
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{
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tmp=ospf_hash_find(oa->gr, *rts, *rts, LSA_T_RT);
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add_cand(&oa->cand,tmp,act->dist,sl);
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}
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break;
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}
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}
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}
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void
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add_cand(list *l, struct top_hash_entry *en, u16 dist, slab *s)
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{
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struct spf_n *tmp;
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node *prev;
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int flag=0;
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if(en==NULL) return;
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if(en->lsa.age==LSA_MAXAGE) return;
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/* FIXME Does it have link back? Test it! */
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if(en->color==INSPF) return;
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if(dist>en->dist) return;
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if(dist==en->dist)
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{
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//Next hop calc
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}
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else
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{
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/* Clear next hop */
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if(en->color==CANDIDATE)
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{
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WALK_LIST(tmp,*l)
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{
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if(tmp->en==en)
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{
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rem_node(NODE tmp);
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flag=1;
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break;
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}
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}
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}
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if(flag!=1)
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{
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tmp=sl_alloc(s);
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tmp->en=en;
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}
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en->dist=dist;
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en->color=CANDIDATE;
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prev=NULL;
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WALK_LIST(tmp,*l)
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{
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if((tmp->en->dist>dist)||
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((tmp->en->dist==dist)&&(tmp->en->lsa.type==LSA_T_NET)))
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{
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if(prev==NULL) add_head(l,NODE tmp);
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else insert_node(NODE tmp,prev);
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break;
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}
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}
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}
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}
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