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Code and comments cleanup.

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This commit is contained in:
Ondrej Filip 2004-06-04 14:03:30 +00:00
parent 39e517d47c
commit d6c28f3ada
1 changed files with 44 additions and 48 deletions
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92
proto/ospf/lsupd.c
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@ -11,18 +11,14 @@
/** /**
* flood_lsa - send received or generated lsa to the neighbors * flood_lsa - send received or generated lsa to the neighbors
* @n: neighbor than sent this lsa (or NULL if generated) * @n: neighbor than sent this lsa (or NULL if generated)
* @hn: LSA header * @hn: LSA header followed by lsa body in network endianity (may be NULL)
* @hh: LSA header * @hh: LSA header in host endianity (must be filled)
* @po: actual instance of OSPF protocol * @po: actual instance of OSPF protocol
* @iff: interface which received this LSA (or NULL if LSA is generated) * @iff: interface which received this LSA (or NULL if LSA is generated)
* @oa: ospf_area which is the LSA generated for * @oa: ospf_area which is the LSA generated for
* @rtl: add this LSA into retransmission list * @rtl: add this LSA into retransmission list
* *
* Calculation of internal paths in an area is described in 16.1 of RFC 2328. * return value - was the LSA flooded back?
* It's based on Dijkstra's shortest path tree algorithms.
* RFC recommends to add ASBR routers into routing table. I don't do this
* and latter parts of routing table calculation look directly into LSA
* Database. This function is invoked from area_disp().
*/ */
int int
@ -34,7 +30,7 @@ flood_lsa(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
struct ospf_neighbor *nn; struct ospf_neighbor *nn;
struct top_hash_entry *en; struct top_hash_entry *en;
struct proto *p=&po->proto; struct proto *p=&po->proto;
int ret,retval=0; int ret, retval = 0;
/* pg 148 */ /* pg 148 */
WALK_LIST(NODE ifa,po->iface_list) WALK_LIST(NODE ifa,po->iface_list)
@ -129,15 +125,16 @@ flood_lsa(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
{ {
if((n->rid==iff->drid)||n->rid==iff->bdrid) continue; /* pg 150 (3) */ if((n->rid==iff->drid)||n->rid==iff->bdrid) continue; /* pg 150 (3) */
if(iff->state==OSPF_IS_BACKUP) continue; /* pg 150 (4) */ if(iff->state==OSPF_IS_BACKUP) continue; /* pg 150 (4) */
retval=1; retval = 1; /* FIXME !!!!!!!!!!! */
} }
{ {
sock *sk; sock *sk;
ip_addr to; ip_addr to;
u16 len; u16 len, age;
struct ospf_lsupd_packet *pk; struct ospf_lsupd_packet *pk;
struct ospf_packet *op; struct ospf_packet *op;
struct ospf_lsa_header *lh;
if(ifa->type==OSPF_IT_NBMA) sk=ifa->ip_sk; if(ifa->type==OSPF_IT_NBMA) sk=ifa->ip_sk;
else sk=ifa->hello_sk; /* FIXME is this true for PTP? */ else sk=ifa->hello_sk; /* FIXME is this true for PTP? */
@ -148,35 +145,32 @@ flood_lsa(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
fill_ospf_pkt_hdr(ifa, pk, LSUPD_P); fill_ospf_pkt_hdr(ifa, pk, LSUPD_P);
pk->lsano=htonl(1); pk->lsano=htonl(1);
lh = (struct ospf_lsa_header *)(pk+1);
/* Copy LSA into the packet */
if(hn) if(hn)
{ {
struct ospf_lsa_header *lh = (struct ospf_lsa_header *)(pk+1); memcpy(lh, hn, ntohs(hn->length));
u16 age = ntohs(lh->age);
memcpy(pk+1,hn,ntohs(hn->length));
len=sizeof(struct ospf_lsupd_packet)+ntohs(hn->length);
age += ifa->inftransdelay;
if(age>LSA_MAXAGE) age = LSA_MAXAGE;
lh->age = htons(age);
} }
else else
{ {
u8 *help; u8 *help;
struct top_hash_entry *en; struct top_hash_entry *en;
struct ospf_lsa_header *lh = (struct ospf_lsa_header *)(pk+1);
u16 age = hh->age;
htonlsah(hh,lh); htonlsah(hh,lh);
age+=ifa->inftransdelay; help = (u8 *)(lh+1);
if(age>LSA_MAXAGE) age=LSA_MAXAGE; en = ospf_hash_find_header(oa->gr,hh);
lh->age=htons(age);
help=(u8 *)(lh+1);
en=ospf_hash_find_header(oa->gr,hh);
htonlsab(en->lsa_body,help,hh->type,hh->length htonlsab(en->lsa_body,help,hh->type,hh->length
-sizeof(struct ospf_lsa_header)); -sizeof(struct ospf_lsa_header));
len=hh->length+sizeof(struct ospf_lsupd_packet);
} }
len = sizeof(struct ospf_lsupd_packet)+ntohs(lh->length);
age = ntohs(lh->age);
age += ifa->inftransdelay;
if( age > LSA_MAXAGE ) age = LSA_MAXAGE;
lh->age = htons(age);
op->length=htons(len); op->length=htons(len);
ospf_pkt_finalize(ifa, op); ospf_pkt_finalize(ifa, op);
OSPF_TRACE(D_PACKETS, "LS upd flooded via %s", ifa->iface->name); OSPF_TRACE(D_PACKETS, "LS upd flooded via %s", ifa->iface->name);
@ -386,13 +380,14 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
DBG("PG143(5): Received LSA is newer\n"); DBG("PG143(5): Received LSA is newer\n");
if(lsatmp.type==LSA_T_NET) /* pg 145 (5f) - premature aging of self originated lsa */
if((!self) && (lsatmp.type==LSA_T_NET))
{ {
WALK_LIST(nifa,po->iface_list) WALK_LIST(nifa,po->iface_list)
{ {
if(ipa_compare(nifa->iface->addr->ip,ipa_from_u32(lsatmp.id))==0) if(ipa_compare(nifa->iface->addr->ip,ipa_from_u32(lsatmp.id))==0)
{ {
self=1; self = 1;
break; break;
} }
} }
@ -415,7 +410,7 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
OSPF_TRACE(D_EVENTS, "Premature aging self originated lsa."); OSPF_TRACE(D_EVENTS, "Premature aging self originated lsa.");
OSPF_TRACE(D_EVENTS, "Type: %d, Id: %I, Rt: %I",lsatmp.type, OSPF_TRACE(D_EVENTS, "Type: %d, Id: %I, Rt: %I",lsatmp.type,
lsatmp.id, lsatmp.rt); lsatmp.id, lsatmp.rt);
lsasum_check(lsa,(lsa+1),po); lsasum_check(lsa,(lsa+1),po); /* It also calculates chsum! */
lsatmp.checksum=ntohs(lsa->checksum); lsatmp.checksum=ntohs(lsa->checksum);
flood_lsa(NULL,lsa,&lsatmp,po,NULL,oa,0); flood_lsa(NULL,lsa,&lsatmp,po,NULL,oa,0);
if(en=ospf_hash_find_header(oa->gr,&lsatmp)) if(en=ospf_hash_find_header(oa->gr,&lsatmp))
@ -426,7 +421,7 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
} }
/* pg 144 (5a) */ /* pg 144 (5a) */
if(lsadb && ((now-lsadb->inst_t)<=MINLSARRIVAL)) if(lsadb && ((now-lsadb->inst_t)<=MINLSARRIVAL)) /* FIXME: test for flooding? */
{ {
DBG("I got it in less that MINLSARRIVAL\n"); DBG("I got it in less that MINLSARRIVAL\n");
continue; continue;
@ -434,7 +429,7 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
if(flood_lsa(n,lsa,&lsatmp,po,ifa,ifa->oa,1)==0) if(flood_lsa(n,lsa,&lsatmp,po,ifa,ifa->oa,1)==0)
{ {
DBG("Wasn't flooded back\n"); DBG("Wasn't flooded back\n"); /* ps 144(5e), pg 153 */
if(ifa->state==OSPF_IS_BACKUP) if(ifa->state==OSPF_IS_BACKUP)
{ {
if(ifa->drid==n->rid) ospf_lsa_delay(n, lsa, p); if(ifa->drid==n->rid) ospf_lsa_delay(n, lsa, p);
@ -444,20 +439,19 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
/* Remove old from all ret lists */ /* Remove old from all ret lists */
/* pg 144 (5c) */ /* pg 144 (5c) */
if(lsadb) WALK_LIST(NODE ift,po->iface_list)
WALK_LIST(NODE ift,po->iface_list) WALK_LIST(NODE ntmp,ift->neigh_list)
WALK_LIST(NODE ntmp,ift->neigh_list) {
{ struct top_hash_entry *en;
struct top_hash_entry *en; if(ntmp->state>NEIGHBOR_EXSTART)
if(ntmp->state>NEIGHBOR_EXSTART) if((en=ospf_hash_find_header(ntmp->lsrth,&lsadb->lsa))!=NULL)
if((en=ospf_hash_find_header(ntmp->lsrth,&lsadb->lsa))!=NULL) {
{ s_rem_node(SNODE en);
s_rem_node(SNODE en); if(en->lsa_body!=NULL) mb_free(en->lsa_body);
if(en->lsa_body!=NULL) mb_free(en->lsa_body); en->lsa_body=NULL;
en->lsa_body=NULL; ospf_hash_delete(ntmp->lsrth,en);
ospf_hash_delete(ntmp->lsrth,en); }
} }
}
if((lsatmp.age==LSA_MAXAGE)&&(lsatmp.sn==LSA_MAXSEQNO) if((lsatmp.age==LSA_MAXAGE)&&(lsatmp.sn==LSA_MAXSEQNO)
&&lsadb&&can_flush_lsa(oa)) &&lsadb&&can_flush_lsa(oa))
@ -465,7 +459,7 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
flush_lsa(lsadb,oa); flush_lsa(lsadb,oa);
schedule_rtcalc(oa); schedule_rtcalc(oa);
continue; continue;
} } /* FIXME lsack? */
/* pg 144 (5d) */ /* pg 144 (5d) */
body=mb_alloc(p->pool,lsatmp.length-sizeof(struct ospf_lsa_header)); body=mb_alloc(p->pool,lsatmp.length-sizeof(struct ospf_lsa_header));
@ -477,15 +471,16 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
continue; continue;
} }
/* FIXME pg145 (6)?? */ /* FIXME pg145 (6) */
/* pg145 (7) */ /* pg145 (7) */
if(lsa_comp(&lsatmp,&lsadb->lsa)==CMP_SAME) if(lsa_comp(&lsatmp,&lsadb->lsa)==CMP_SAME)
{ {
struct top_hash_entry *en; struct top_hash_entry *en;
DBG("PG145(6) Got the same LSA\n"); DBG("PG145(7) Got the same LSA\n");
if((en=ospf_hash_find_header(n->lsrth,&lsadb->lsa))!=NULL) if((en=ospf_hash_find_header(n->lsrth,&lsadb->lsa))!=NULL)
{ {
/* pg145 (7a) */
s_rem_node(SNODE en); s_rem_node(SNODE en);
if(en->lsa_body!=NULL) mb_free(en->lsa_body); if(en->lsa_body!=NULL) mb_free(en->lsa_body);
en->lsa_body=NULL; en->lsa_body=NULL;
@ -497,6 +492,7 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
} }
else else
{ {
/* pg145 (7b) */
ospf_lsack_direct_tx(n,lsa); ospf_lsack_direct_tx(n,lsa);
} }
continue; continue;