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bird/proto/ospf/lsupd.c

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/*
* 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"
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,
struct ospf_area *oa, int rtl)
{
struct ospf_iface *ifa;
struct ospf_neighbor *nn;
struct top_hash_entry *en;
struct proto *p=&po->proto;
int ret,retval=0;
/* pg 148 */
WALK_LIST(NODE ifa,po->iface_list)
{
if(hh->type==LSA_T_EXT)
{
if(ifa->type==OSPF_IT_VLINK) continue;
if(ifa->oa->stub) continue;
}
else
{
if(oa->areaid==BACKBONE)
{
if((ifa->type!=OSPF_IT_VLINK)&&(ifa->oa!=oa)) continue;
}
else
{
if(ifa->oa!=oa) continue;
}
}
ret=0;
WALK_LIST(NODE nn, ifa->neigh_list)
{
if(nn->state<NEIGHBOR_EXCHANGE) continue;
if(nn->state<NEIGHBOR_FULL)
{
if((en=ospf_hash_find_header(nn->lsrqh,hh))!=NULL)
{
switch(lsa_comp(hh,&en->lsa))
{
case CMP_OLDER:
continue;
break;
case CMP_SAME:
s_rem_node(SNODE en);
DBG("Removing from lsreq list for neigh %I\n", nn->rid);
ospf_hash_delete(nn->lsrqh,en);
if(EMPTY_SLIST(nn->lsrql)) ospf_neigh_sm(nn, INM_LOADDONE);
continue;
break;
case CMP_NEWER:
s_rem_node(SNODE en);
DBG("Removing from lsreq list for neigh %I\n", nn->rid);
ospf_hash_delete(nn->lsrqh,en);
if(EMPTY_SLIST(nn->lsrql)) ospf_neigh_sm(nn, INM_LOADDONE);
break;
default: bug("Bug in lsa_comp?");
}
}
}
if(nn==n) continue;
if(rtl!=0)
{
if((en=ospf_hash_find_header(nn->lsrth, hh))==NULL)
{
en=ospf_hash_get_header(nn->lsrth, hh);
}
else
{
s_rem_node(SNODE en);
}
s_add_tail(&nn->lsrtl, SNODE en);
memcpy(&en->lsa,hh,sizeof(struct ospf_lsa_header));
DBG("Adding LSA lsrt RT: %I, Id: %I, Type: %u for n: %I\n",
en->lsa.rt,en->lsa.id, en->lsa.type, nn->ip);
}
else
{
if((en=ospf_hash_find_header(nn->lsrth, hh))!=NULL)
{
s_rem_node(SNODE en);
ospf_hash_delete(nn->lsrth, en);
}
}
ret=1;
}
if(ret==0) continue;
if(ifa==iff)
{
if((n->rid==iff->drid)||n->rid==iff->bdrid) continue;
if(iff->state==OSPF_IS_BACKUP) continue;
retval=1;
}
{
sock *sk;
ip_addr to;
u16 len;
struct ospf_lsupd_packet *pk;
struct ospf_packet *op;
if(ifa->type==OSPF_IT_NBMA) sk=ifa->ip_sk;
else sk=ifa->hello_sk; /* FIXME is this true for PTP? */
pk=(struct ospf_lsupd_packet *)sk->tbuf;
op=(struct ospf_packet *)sk->tbuf;
fill_ospf_pkt_hdr(ifa, pk, LSUPD_P);
pk->lsano=htonl(1);
if(hn!=NULL)
{
memcpy(pk+1,hn,ntohs(hn->length));
len=sizeof(struct ospf_lsupd_packet)+ntohs(hn->length);
}
else
{
u8 *help;
struct top_hash_entry *en;
struct ospf_lsa_header *lh;
u16 age;
lh=(struct ospf_lsa_header *)(pk+1);
htonlsah(hh,lh);
age=hh->age;
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);
htonlsab(en->lsa_body,help,hh->type,hh->length
-sizeof(struct ospf_lsa_header));
len=hh->length+sizeof(struct ospf_lsupd_packet);
}
op->length=htons(len);
ospf_pkt_finalize(ifa, op);
debug("%s: LS upd flooded via %s\n", p->name, ifa->iface->name);
if(ifa->type==OSPF_IT_NBMA)
{
sk_send_to_agt(sk ,len, ifa, NEIGHBOR_EXCHANGE);
}
else
{
if((ifa->state==OSPF_IS_BACKUP)||(ifa->state==OSPF_IS_DR))
sk_send_to(sk,len, AllSPFRouters, OSPF_PROTO);
else sk_send_to(sk,len, AllDRouters, OSPF_PROTO);
}
}
}
return retval;
}
void /* I send all I received in LSREQ */
ospf_lsupd_tx_list(struct ospf_neighbor *n, list *l)
{
struct l_lsr_head *llsh;
u16 len;
u32 lsano;
struct top_hash_entry *en;
struct ospf_lsupd_packet *pk;
struct ospf_packet *op;
struct proto *p=&n->ifa->oa->po->proto;
void *pktpos;
u8 ii;
u8 *jj=n->ifa->ip_sk->tbuf;
if(EMPTY_LIST(*l)) return;
pk=(struct ospf_lsupd_packet *)n->ifa->ip_sk->tbuf;
op=(struct ospf_packet *)n->ifa->ip_sk->tbuf;
DBG("LSupd: 1st packet\n");
fill_ospf_pkt_hdr(n->ifa, pk, LSUPD_P);
len=SIPH+sizeof(struct ospf_lsupd_packet);
lsano=0;
pktpos=(pk+1);
WALK_LIST(llsh, *l)
{
if((en=ospf_hash_find(n->ifa->oa->gr,llsh->lsh.id,llsh->lsh.rt,
llsh->lsh.type))==NULL) continue; /* Probably flushed LSA */
DBG("Sending ID=%I, Type=%u, RT=%I\n", llsh->lsh.id, llsh->lsh.type,
llsh->lsh.rt);
if(((u32)(len+en->lsa.length))>n->ifa->iface->mtu)
{
pk->lsano=htonl(lsano);
op->length=htons(len-SIPH);
ospf_pkt_finalize(n->ifa, op);
sk_send_to(n->ifa->ip_sk,len-SIPH, n->ip, OSPF_PROTO);
debug("%s: LS upd sent to %I (%d LSAs)\n", p->name, n->ip, lsano);
DBG("LSupd: next packet\n");
fill_ospf_pkt_hdr(n->ifa, pk, LSUPD_P);
len=SIPH+sizeof(struct ospf_lsupd_packet);
lsano=0;
pktpos=(pk+1);
}
htonlsah(&(en->lsa), pktpos);
pktpos=pktpos+sizeof(struct ospf_lsa_header);
htonlsab(en->lsa_body, pktpos, en->lsa.type, en->lsa.length
-sizeof(struct ospf_lsa_header));
pktpos=pktpos+en->lsa.length-sizeof(struct ospf_lsa_header);
len+=en->lsa.length;
lsano++;
}
if(lsano>0)
{
pk->lsano=htonl(lsano);
op->length=htons(len-SIPH);
ospf_pkt_finalize(n->ifa, op);
debug("%s: LS upd sent to %I (%d LSAs)\n", p->name, n->ip, lsano);
sk_send_to(n->ifa->ip_sk,len-SIPH, n->ip, OSPF_PROTO);
}
}
void
ospf_lsupd_rx(struct ospf_lsupd_packet *ps, struct proto *p,
struct ospf_iface *ifa, u16 size)
{
u32 area,nrid,myrid;
struct ospf_neighbor *n,*ntmp;
struct ospf_lsa_header *lsa;
struct ospf_area *oa;
struct proto_ospf *po=(struct proto_ospf *)p;
u16 length;
u8 i;
nrid=ntohl(ps->ospf_packet.routerid);
myrid=p->cf->global->router_id;
if((n=find_neigh(ifa, nrid))==NULL)
{
debug("%s: Received lsupd from unknown neigbor! (%I)\n", p->name,
nrid);
return ;
}
if(n->state<NEIGHBOR_EXCHANGE)
{
debug("%s: Received lsupd in lesser state than EXCHANGE from (%I)\n",
p->name,n->ip);
return;
}
if(size<=(sizeof(struct ospf_lsupd_packet)+sizeof(struct ospf_lsa_header)))
{
log("%s: Received lsupd from %I is too short!", p->name,n->ip);
return;
}
debug("%s: Received LS upd from %I\n", p->name, n->ip);
ospf_neigh_sm(n, INM_HELLOREC);
lsa=(struct ospf_lsa_header *)(ps+1);
area=htonl(ps->ospf_packet.areaid);
oa=ospf_find_area((struct proto_ospf *)p,area);
for(i=0;i<ntohl(ps->lsano);i++,
lsa=(struct ospf_lsa_header *)(((u8 *)lsa)+ntohs(lsa->length)))
{
struct ospf_lsa_header lsatmp;
struct top_hash_entry *lsadb;
u16 lenn;
int diff=((u8 *)lsa)-((u8 *)ps);
u16 chsum;
if(((diff+sizeof(struct ospf_lsa_header))>=size) ||
((ntohs(lsa->length)+diff)>size))
log("%s: Received lsupd from %I is too short.", p->name,n->ip);
lenn=ntohs(lsa->length);
if((lenn<=sizeof(struct ospf_lsa_header))||(lenn!=(4*(lenn/4))))
{
log("Received LSA with bad length");
ospf_neigh_sm(n,INM_BADLSREQ);
break;
}
/* pg 143 (1) */
chsum=lsa->checksum;
if(chsum!=lsasum_check(lsa,NULL,po))
{
log("Received bad lsa checksum from %I",n->rid);
continue;
}
/* pg 143 (2) */
if((lsa->type<LSA_T_RT)||(lsa->type>LSA_T_EXT))
{
log("Unknown LSA type from %I",n->rid);
continue;
}
/* pg 143 (3) */
if((lsa->type==LSA_T_EXT)&&oa->stub)
{
log("Received External LSA in stub area from %I",n->rid);
continue;
}
ntohlsah(lsa,&lsatmp);
DBG("Update Type: %u ID: %I RT: %I, Sn: 0x%08x Age: %u, Sum: %u\n",
lsatmp.type, lsatmp.id, lsatmp.rt, lsatmp.sn, lsatmp.age,
lsatmp.checksum);
lsadb=ospf_hash_find_header(oa->gr, &lsatmp);
if(lsadb)
DBG("I have Type: %u ID: %I RT: %I, Sn: 0x%08x Age: %u, Sum: %u\n",
lsadb->lsa.type, lsadb->lsa.id, lsadb->lsa.rt, lsadb->lsa.sn,
lsadb->lsa.age, lsadb->lsa.checksum);
/* pg 143 (4) */
if((lsatmp.age==LSA_MAXAGE)&&(lsadb==NULL))
{
int flag=0;
struct ospf_iface *ifatmp;
if(can_flush_lsa(oa))
{
ospf_lsack_direct_tx(n,lsa);
continue;
}
}
/* pg 144 (5) */
if((lsadb==NULL)||(lsa_comp(&lsatmp,&lsadb->lsa)==CMP_NEWER))
{
struct ospf_iface *ift=NULL;
void *body;
struct ospf_iface *nifa;
int self=0;
DBG("PG143(5): Received LSA is newer\n");
if(lsatmp.rt==p->cf->global->router_id) self=1;
if(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;
break;
}
}
}
if(self)
{
struct top_hash_entry *en;
if((lsatmp.age==LSA_MAXAGE)&&(lsatmp.sn==LSA_MAXSEQNO)) continue;
lsatmp.age=LSA_MAXAGE;
lsatmp.sn=LSA_MAXSEQNO;
lsa->age=htons(LSA_MAXAGE);
lsa->sn=htonl(LSA_MAXSEQNO);
debug("%s: Premature aging self originated lsa.\n",p->name);
debug("%s: Type: %d, Id: %I, Rt: %I\n", p->name, lsatmp.type,
lsatmp.id, lsatmp.rt);
lsasum_check(lsa,(lsa+1),po);
lsatmp.checksum=ntohs(lsa->checksum);
flood_lsa(NULL,lsa,&lsatmp,po,NULL,oa,0);
if(en=ospf_hash_find_header(oa->gr,&lsatmp))
{
flood_lsa(NULL,NULL,&en->lsa,po,NULL,oa,1);
}
continue;
}
/* pg 144 (5a) */
if(lsadb && ((now-lsadb->inst_t)<=MINLSARRIVAL))
{
DBG("I got it in less that MINLSARRIVAL\n");
continue;
}
if(flood_lsa(n,lsa,&lsatmp,po,ifa,ifa->oa,1)==0)
{
DBG("Wasn't flooded back\n");
if(ifa->state==OSPF_IS_BACKUP)
{
if(ifa->drid==n->rid) ospf_lsa_delay(n, lsa, p);
}
else ospf_lsa_delay(n, lsa, 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);
ospf_hash_delete(ntmp->lsrth,en);
}
}
if((lsatmp.age==LSA_MAXAGE)&&(lsatmp.sn==LSA_MAXSEQNO)
&&lsadb&&can_flush_lsa(oa))
{
flush_lsa(lsadb,oa);
schedule_rtcalc(oa);
continue;
}
/* pg 144 (5d) */
body=mb_alloc(p->pool,lsatmp.length-sizeof(struct ospf_lsa_header));
ntohlsab(lsa+1,body,lsatmp.type,
lsatmp.length-sizeof(struct ospf_lsa_header));
lsadb=lsa_install_new(&lsatmp,body, oa, p);
DBG("New LSA installed in DB\n");
continue;
}
/* 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");
if((en=ospf_hash_find_header(n->lsrth,&lsadb->lsa))!=NULL)
{
s_rem_node(SNODE en);
ospf_hash_delete(n->lsrth, en);
if(ifa->state==OSPF_IS_BACKUP)
{
if(n->rid==ifa->drid) ospf_lsa_delay(n, lsa, p);
}
}
else
{
ospf_lsack_direct_tx(n,lsa);
}
continue;
}
/* pg145 (8) */
if((lsadb->lsa.age==LSA_MAXAGE)&&(lsadb->lsa.sn==LSA_MAXSEQNO))
{
continue;
}
{
list l;
struct l_lsr_head ll;
init_list(&l);
ll.lsh.id=lsadb->lsa.id;
ll.lsh.rt=lsadb->lsa.rt;
ll.lsh.type=lsadb->lsa.type;
add_tail(&l, NODE &ll);
ospf_lsupd_tx_list(n, &l);
}
}
if(n->state==NEIGHBOR_LOADING)
{
ospf_lsreq_tx(n); /* Send me another part of database */
}
}
void
net_flush_lsa(struct top_hash_entry *en, struct proto_ospf *po,
struct ospf_area *oa)
{
struct ospf_lsa_header *lsa=&en->lsa;
lsa->age=LSA_MAXAGE;
lsa->sn=LSA_MAXSEQNO;
lsasum_calculate(lsa,en->lsa_body,po);
debug("%s: Premature aging self originated lsa!\n",po->proto.name);
debug("%s: Type: %d, Id: %I, Rt: %I\n", po->proto.name, lsa->type,
lsa->id, lsa->rt);
flood_lsa(NULL,NULL,lsa,po,NULL,oa,0);
}
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