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RT calculation strongly simplified. Now, I don't need any

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memory allocation. :-)
This commit is contained in:
Ondrej Filip 2000-04-30 09:32:41 +00:00
parent 8c62d6e3b6
commit e80e9d0da5
4 changed files with 41 additions and 111 deletions
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5
proto/ospf/ospf.h
View File

@ -336,11 +336,6 @@ struct proto_ospf {
int areano; /* Number of area I belong to */
};
struct spf_n {
node n;
struct top_hash_entry *en;
};
static int ospf_start(struct proto *p);
static void ospf_dump(struct proto *p);
static struct proto *ospf_init(struct proto_config *c);

137
proto/ospf/rt.c
View File

@ -8,23 +8,19 @@
#include "ospf.h"
/* FIXME next hop calculation
* FIXME sync with BIRD's routing table
*/
void
ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
{
struct top_hash_entry *en, *nx;
slab *sl, *sll;
struct spf_n *cn;
u32 i,*rts;
struct ospf_lsa_rt *rt;
struct ospf_lsa_rt_link *rtl;
rta a0,*a;
/*
* First of all, mark all vertices as they are not in SPF
* Maybe I can join this work with Aging of structure
* FIXME look at it
*/
WALK_SLIST(SNODE en, oa->lsal)
@ -36,14 +32,9 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
init_list(&oa->cand); /* Empty list of candidates */
oa->trcap=0;
sl=sl_new(p->pool,sizeof(struct spf_n));
sll=sl_new(p->pool,sizeof(list));
cn=sl_alloc(sl);
cn->en=oa->rt;
oa->rt->dist=0;
oa->rt->color=CANDIDATE;
add_head(&oa->cand,NODE cn);
add_head(&oa->cand, &en->cn);
while(!EMPTY_LIST(oa->cand))
{
@ -52,9 +43,8 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
struct ospf_lsa_net *net;
n=HEAD(oa->cand);
act=((struct spf_n *)n)->en;
act=SKIP_BACK(struct top_hash_entry, cn, n);
rem_node(n);
sl_free(sl,n); /* Good idea? */
act->color=INSPF;
switch(act->lsa.type)
@ -82,7 +72,7 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
log("Unknown link type in router lsa.\n");
break;
}
add_cand(&oa->cand,tmp,act,act->dist+rtl->metric,sl,sll);
add_cand(&oa->cand,tmp,act,act->dist+rtl->metric);
}
break;
case LSA_T_NET:
@ -92,7 +82,7 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
sizeof(struct ospf_lsa_net))/sizeof(u32);i++)
{
tmp=ospf_hash_find(oa->gr, *rts, *rts, LSA_T_RT);
add_cand(&oa->cand,tmp,act,act->dist,sl,sll);
add_cand(&oa->cand,tmp,act,act->dist);
}
break;
}
@ -131,110 +121,57 @@ ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
void
add_cand(list *l, struct top_hash_entry *en, struct top_hash_entry *par,
u16 dist, slab *s, slab *sll)
u16 dist)
{
struct spf_n *tmp;
node *prev;
node *prev,*n;
int flag=0;
struct top_hash_entry *act;
if(en==NULL) return;
if(en->lsa.age==LSA_MAXAGE) return;
/* FIXME Does it have link back? Test it! */
if(en->color==INSPF) return;
if(dist>en->dist) return;
if(dist>=en->dist) return;
/*
* FIXME The line above is not a bug, but we don't support
* multiple next hops. I'll start as soon as nest will
*/
if(dist==en->dist)
en->nh=calc_next_hop(par);
if(en->color==CANDIDATE) /* We found shorter path */
{
en->nh=multi_next_hop(par,en,s,sll);
rem_node(&en->cn);
}
else
en->dist=dist;
en->color=CANDIDATE;
prev=NULL;
WALK_LIST(n,*l)
{
en->nh=calc_next_hop(par,s,sll);
if(en->color==CANDIDATE)
act=SKIP_BACK(struct top_hash_entry, cn, n);
if((act->dist>dist)||
((act->dist==dist)&&(act->lsa.type==LSA_T_NET)))
{
WALK_LIST(tmp,*l)
{
if(tmp->en==en)
{
rem_node(NODE tmp);
flag=1;
break;
}
}
if(prev==NULL) add_head(l,&en->cn);
else insert_node(&en->cn,prev);
break;
}
if(flag!=1)
{
tmp=sl_alloc(s);
tmp->en=en;
}
en->dist=dist;
en->color=CANDIDATE;
prev=NULL;
WALK_LIST(tmp,*l)
{
if((tmp->en->dist>dist)||
((tmp->en->dist==dist)&&(tmp->en->lsa.type==LSA_T_NET)))
{
if(prev==NULL) add_head(l,NODE tmp);
else insert_node(NODE tmp,prev);
break;
}
}
/* FIXME Some VLINK staff should be here */
prev=n;
}
/* FIXME Some VLINK staff should be here */
}
list *
calc_next_hop(struct top_hash_entry *par, slab *sl, slab *sll)
struct top_hash_entry *
calc_next_hop(struct top_hash_entry *par)
{
struct spf_n *nh;
list *l;
if(par->nh==NULL)
{
if(par->lsa.type!=LSA_T_RT) return NULL;
l=sl_alloc(sll);
init_list(l);
nh=sl_alloc(sl);
nh->en=par;
add_head(l, NODE nh);
return l;
}
return par->nh;
return par;
}
list *
multi_next_hop(struct top_hash_entry *par, struct top_hash_entry *en, slab *sl,
slab *sll)
{
struct spf_n *n1,*n2;
list *l1,*l2;
l1=calc_next_hop(par,sl,sll);
if(l1==NULL) return en->nh;
if(en->nh==NULL) return l1;
l2=sl_alloc(sll);
init_list(l2);
WALK_LIST(n1, *l1)
{
n2=sl_alloc(sl);
memcpy(n2,n1,sizeof(struct spf_n));
add_tail(l2,NODE n2);
}
WALK_LIST(n1, *en->nh)
{
n2=sl_alloc(sl);
memcpy(n2,n1,sizeof(struct spf_n));
add_tail(l2,NODE n2);
}
return l2;
}

7
proto/ospf/rt.h
View File

@ -12,10 +12,7 @@
void ospf_rt_spfa(struct ospf_area *oa, struct proto *p);
void add_cand(list *l, struct top_hash_entry *en, struct top_hash_entry *par,
u16 dist, slab *s, slab *sll);
list *calc_next_hop(struct top_hash_entry *par, slab *sl, slab *sll);
list *multi_next_hop(struct top_hash_entry *par, struct top_hash_entry *en,
slab *sl, slab *sll);
u16 dist);
struct top_hash_entry *calc_next_hop(struct top_hash_entry *par);
#endif /* _BIRD_OSPF_RT_H_ */

3
proto/ospf/topology.h
View File

@ -11,11 +11,12 @@
struct top_hash_entry { /* Index for fast mapping (type,rtrid,LSid)->vertex */
snode n;
node cn;
struct top_hash_entry *next; /* Next in hash chain */
struct ospf_lsa_header lsa;
void *lsa_body;
bird_clock_t inst_t; /* Time of installation into DB */
list *nh; /* List of next hops */
struct top_hash_entry *nh; /* Next hop */
u16 dist; /* Distance from the root */
u8 color;
#define OUTSPF 0