mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-09 20:58:44 +00:00
Code and comments cleanup.
This commit is contained in:
Ondrej Filip
parent
39e517d47c
commit
d6c28f3ada
@ -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;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user