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Routing table calculation. Dijkstra done.

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This commit is contained in:
Ondrej Filip 2000-04-26 12:54:23 +00:00
parent 0cadd5f531
commit dfa9a53a66
8 changed files with 191 additions and 10 deletions
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2
proto/ospf/Makefile
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@ -1,4 +1,4 @@
source=ospf.c topology.c packet.c hello.c neighbor.c iface.c dbdes.c lsreq.c lsupd.c lsack.c lsalib.c
source=ospf.c topology.c packet.c hello.c neighbor.c iface.c dbdes.c lsreq.c lsupd.c lsack.c lsalib.c rt.c
root-rel=../../
dir-name=proto/ospf

6
proto/ospf/lsupd.c
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@ -8,12 +8,6 @@
#include "ospf.h"
void
ospf_lsupd_tx(struct ospf_neighbor *n)
{
/* FIXME Go on! */
}
int
flood_lsa(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
struct ospf_lsa_header *hh, struct proto_ospf *po, struct ospf_iface *iff,

1
proto/ospf/lsupd.h
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@ -10,7 +10,6 @@
#ifndef _BIRD_OSPF_LSUPD_H_
#define _BIRD_OSPF_LSUPD_H_
void ospf_lsupd_tx(struct ospf_neighbor *n);
void ospf_lsupd_tx_list(struct ospf_neighbor *n, list *l);
void ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
struct ospf_iface *ifa, u16 size);

14
proto/ospf/ospf.h
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@ -202,6 +202,10 @@ struct ospf_lsa_rt_link_tos { /* Actually we ignore TOS. This is useless */
u16 metric;
};
struct ospf_lsa_net {
u32 netmask;
};
struct ospf_lsa_summ {
u32 netmask;
};
@ -320,7 +324,9 @@ struct ospf_area {
struct top_graph *gr; /* LSA graph */
slist lsal; /* List of all LSA's */
struct top_hash_entry *rt; /* My own router LSA */
int stub;
list cand; /* List of candidates for RT calc. */
u8 stub;
u8 trcap; /* Transit capability? */
};
struct proto_ospf {
@ -330,6 +336,11 @@ 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);
@ -346,5 +357,6 @@ static void ospf_postconfig(struct proto_config *c);
#include "proto/ospf/lsupd.h"
#include "proto/ospf/lsack.h"
#include "proto/ospf/lsalib.h"
#include "proto/ospf/rt.h"
#endif /* _BIRD_OSPF_H_ */

153
proto/ospf/rt.c Normal file
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@ -0,0 +1,153 @@
/*
* BIRD -- OSPF
*
* (c) 2000 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
void
ospf_rt_spfa(struct ospf_area *oa, struct proto *p)
{
struct top_hash_entry *en;
slab *sl;
struct spf_n *cn;
u32 i,*rts;
/*
* First of all, mark all vertices as they are not in SPF
* Maybe I can join this work with Aging of structure
*/
WALK_SLIST(SNODE en, oa->lsal)
{
en->color=OUTSPF;
en->dist=LSINFINITY;
}
init_list(&oa->cand); /* Empty list of candidates */
oa->trcap=0;
sl=sl_new(p->pool,sizeof(struct spf_n));
cn=sl_alloc(sl);
cn->en=oa->rt;
oa->rt->dist=0;
oa->rt->color=CANDIDATE;
add_head(&oa->cand,NODE cn);
while(!EMPTY_LIST(oa->cand))
{
struct top_hash_entry *act,*tmp;
node *n;
struct ospf_lsa_rt *rt;
struct ospf_lsa_rt_link *rtl;
struct ospf_lsa_net *net;
n=HEAD(oa->cand);
act=((struct spf_n *)n)->en;
rem_node(n);
sl_free(sl,n); /* Good idea? */
act->color=INSPF;
switch(act->lsa.type)
{
case LSA_T_RT:
rt=(struct ospf_lsa_rt *)act->lsa_body;
if((rt->VEB)&(1>>LSA_RT_V)) oa->trcap=1;
rtl=(struct ospf_lsa_rt_link *)(rt+1);
for(i=0;rt->links;i++)
{
tmp=NULL;
switch((rtl+i)->type)
{
case LSART_STUB:
case LSART_VLNK:
continue;
break;
case LSART_NET:
tmp=ospf_hash_find(oa->gr,rtl->data,rtl->id,LSA_T_RT);
break;
case LSART_PTP:
tmp=ospf_hash_find(oa->gr,rtl->data,rtl->id,LSA_T_NET);
break;
default:
log("Unknown link type in router lsa.\n");
break;
}
add_cand(&oa->cand,tmp,act->dist+rtl->metric,sl);
}
break;
case LSA_T_NET:
net=(struct ospf_lsa_net *)act->lsa_body;
rts=(u32 *)(net+1);
for(i=0;i<(act->lsa.length-sizeof(struct ospf_lsa_header)-
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->dist,sl);
}
break;
}
}
}
void
add_cand(list *l, struct top_hash_entry *en, u16 dist, slab *s)
{
struct spf_n *tmp;
node *prev;
int flag=0;
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)
{
//Next hop calc
}
else
{
/* Clear next hop */
if(en->color==CANDIDATE)
{
WALK_LIST(tmp,*l)
{
if(tmp->en==en)
{
rem_node(NODE tmp);
flag=1;
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)
{
if(prev==NULL) add_head(l,NODE tmp);
else insert_node(NODE tmp,prev);
break;
}
}
}
}

16
proto/ospf/rt.h Normal file
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@ -0,0 +1,16 @@
/*
* BIRD -- OSPF
*
* (c) 2000 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*
*/
#ifndef _BIRD_OSPF_RT_H_
#define _BIRD_OSPF_RT_H_
void ospf_rt_spfa(struct ospf_area *oa, struct proto *p);
void add_cand(list *l, struct top_hash_entry *en, u16 dist, slab *s);
#endif /* _BIRD_OSPF_RT_H_ */

2
proto/ospf/topology.c
View File

@ -175,7 +175,7 @@ addifa_rtlsa(struct ospf_iface *ifa)
{
struct ospf_lsa_header *lsa;
oa=mb_alloc(po->proto.pool, sizeof(struct ospf_area));
oa=mb_allocz(po->proto.pool, sizeof(struct ospf_area));
add_tail(&po->area_list,NODE oa);
oa->areaid=ifa->an;
oa->gr=ospf_top_new(po);

7
proto/ospf/topology.h
View File

@ -15,6 +15,13 @@ struct top_hash_entry { /* Index for fast mapping (type,rtrid,LSid)->vertex */
struct ospf_lsa_header lsa;
void *lsa_body;
bird_clock_t inst_t; /* Time of installation into DB */
list nh; /* List of next hops */
u16 dist; /* Distance from the root */
u8 color;
#define OUTSPF 0
#define CANDIDATE 1
#define INSPF 2
u8 padding;
};
struct top_graph {