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Diffstat (limited to 'proto/ospf/lsupd.c')
-rw-r--r--proto/ospf/lsupd.c92
1 files changed, 44 insertions, 48 deletions
diff --git a/proto/ospf/lsupd.c b/proto/ospf/lsupd.c
index aa452be8..3ec0f100 100644
--- a/proto/ospf/lsupd.c
+++ b/proto/ospf/lsupd.c
@@ -11,18 +11,14 @@
/**
* flood_lsa - send received or generated lsa to the neighbors
* @n: neighbor than sent this lsa (or NULL if generated)
- * @hn: LSA header
- * @hh: LSA header
+ * @hn: LSA header followed by lsa body in network endianity (may be NULL)
+ * @hh: LSA header in host endianity (must be filled)
* @po: actual instance of OSPF protocol
* @iff: interface which received this LSA (or NULL if LSA is generated)
* @oa: ospf_area which is the LSA generated for
* @rtl: add this LSA into retransmission list
*
- * Calculation of internal paths in an area is described in 16.1 of RFC 2328.
- * 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().
+ * return value - was the LSA flooded back?
*/
int
@@ -34,7 +30,7 @@ flood_lsa(struct ospf_neighbor *n, struct ospf_lsa_header *hn,
struct ospf_neighbor *nn;
struct top_hash_entry *en;
struct proto *p=&po->proto;
- int ret,retval=0;
+ int ret, retval = 0;
/* pg 148 */
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(iff->state==OSPF_IS_BACKUP) continue; /* pg 150 (4) */
- retval=1;
+ retval = 1; /* FIXME !!!!!!!!!!! */
}
{
sock *sk;
ip_addr to;
- u16 len;
+ u16 len, age;
struct ospf_lsupd_packet *pk;
struct ospf_packet *op;
+ struct ospf_lsa_header *lh;
if(ifa->type==OSPF_IT_NBMA) sk=ifa->ip_sk;
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);
pk->lsano=htonl(1);
+ lh = (struct ospf_lsa_header *)(pk+1);
+
+ /* Copy LSA into the packet */
if(hn)
{
- struct ospf_lsa_header *lh = (struct ospf_lsa_header *)(pk+1);
- 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);
+ memcpy(lh, hn, ntohs(hn->length));
}
else
{
u8 *help;
struct top_hash_entry *en;
- struct ospf_lsa_header *lh = (struct ospf_lsa_header *)(pk+1);
- u16 age = hh->age;
htonlsah(hh,lh);
- age+=ifa->inftransdelay;
- if(age>LSA_MAXAGE) age=LSA_MAXAGE;
- lh->age=htons(age);
- help=(u8 *)(lh+1);
- en=ospf_hash_find_header(oa->gr,hh);
+ help = (u8 *)(lh+1);
+ en = ospf_hash_find_header(oa->gr,hh);
htonlsab(en->lsa_body,help,hh->type,hh->length
-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);
ospf_pkt_finalize(ifa, op);
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");
- 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)
{
if(ipa_compare(nifa->iface->addr->ip,ipa_from_u32(lsatmp.id))==0)
{
- self=1;
+ self = 1;
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, "Type: %d, Id: %I, Rt: %I",lsatmp.type,
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);
flood_lsa(NULL,lsa,&lsatmp,po,NULL,oa,0);
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) */
- 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");
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)
{
- 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->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 */
/* pg 144 (5c) */
- if(lsadb)
- WALK_LIST(NODE ift,po->iface_list)
- WALK_LIST(NODE ntmp,ift->neigh_list)
- {
- struct top_hash_entry *en;
- if(ntmp->state>NEIGHBOR_EXSTART)
- if((en=ospf_hash_find_header(ntmp->lsrth,&lsadb->lsa))!=NULL)
- {
- s_rem_node(SNODE en);
- if(en->lsa_body!=NULL) mb_free(en->lsa_body);
- en->lsa_body=NULL;
- ospf_hash_delete(ntmp->lsrth,en);
- }
- }
+ WALK_LIST(NODE ift,po->iface_list)
+ WALK_LIST(NODE ntmp,ift->neigh_list)
+ {
+ struct top_hash_entry *en;
+ if(ntmp->state>NEIGHBOR_EXSTART)
+ if((en=ospf_hash_find_header(ntmp->lsrth,&lsadb->lsa))!=NULL)
+ {
+ s_rem_node(SNODE en);
+ if(en->lsa_body!=NULL) mb_free(en->lsa_body);
+ en->lsa_body=NULL;
+ ospf_hash_delete(ntmp->lsrth,en);
+ }
+ }
if((lsatmp.age==LSA_MAXAGE)&&(lsatmp.sn==LSA_MAXSEQNO)
&&lsadb&&can_flush_lsa(oa))
@@ -465,7 +459,7 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
flush_lsa(lsadb,oa);
schedule_rtcalc(oa);
continue;
- }
+ } /* FIXME lsack? */
/* pg 144 (5d) */
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;
}
- /* FIXME pg145 (6)?? */
+ /* FIXME pg145 (6) */
/* pg145 (7) */
if(lsa_comp(&lsatmp,&lsadb->lsa)==CMP_SAME)
{
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)
{
+ /* pg145 (7a) */
s_rem_node(SNODE en);
if(en->lsa_body!=NULL) mb_free(en->lsa_body);
en->lsa_body=NULL;
@@ -497,6 +492,7 @@ ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
}
else
{
+ /* pg145 (7b) */
ospf_lsack_direct_tx(n,lsa);
}
continue;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 09:27:36 +0000