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bird/proto/ospf/lsupd.c

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/*
* BIRD -- OSPF
*
* (c) 2000-2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
/**
* flood_lsa - send received or generated lsa to the neighbors
* @n: neighbor than sent this lsa (or NULL if generated)
* @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
*
* return value - was the LSA flooded back?
*/
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(ifa->stub) continue;
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);
if(en->lsa_body!=NULL) mb_free(en->lsa_body);
en->lsa_body=NULL;
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);
if(en->lsa_body!=NULL) mb_free(en->lsa_body);
en->lsa_body=NULL;
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)
{
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);
if(en->lsa_body!=NULL) mb_free(en->lsa_body);
en->lsa_body=NULL;
ospf_hash_delete(nn->lsrth, en);
}
}
ret=1;
}
if(ret==0) continue; /* pg 150 (2) */
if(ifa==iff)
{
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; /* FIXME !!!!!!!!!!! */
}
{
sock *sk;
ip_addr to;
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? */
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);
lh = (struct ospf_lsa_header *)(pk+1);
/* Copy LSA into the packet */
if(hn)
{
memcpy(lh, hn, ntohs(hn->length));
}
else
{
u8 *help;
struct top_hash_entry *en;
htonlsah(hh,lh);
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 = 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);
if(ifa->type==OSPF_IT_NBMA)
{
if((ifa->state==OSPF_IS_BACKUP)||(ifa->state==OSPF_IS_DR))
sk_send_to_agt(sk ,len, ifa, NEIGHBOR_EXCHANGE);
else sk_send_to_bdr(sk ,len, ifa);
}
else
{
if((ifa->state==OSPF_IS_BACKUP)||(ifa->state==OSPF_IS_DR)||
(ifa->type==OSPF_IT_PTP))
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 Sn: 0x%x Age: %u\n",
llsh->lsh.id, llsh->lsh.type, llsh->lsh.rt, en->lsa.sn, en->lsa.age);
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);
OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", 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);
OSPF_TRACE(D_PACKETS, "LS upd sent to %I (%d LSAs)", 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)
{
OSPF_TRACE(D_PACKETS, "Received lsupd from unknown neighbor! (%I)",
nrid);
return ;
}
if(n->state<NEIGHBOR_EXCHANGE)
{
OSPF_TRACE(D_PACKETS, "Received lsupd in lesser state than EXCHANGE from (%I)",
n->ip);
return;
}
if(size<=(sizeof(struct ospf_lsupd_packet)+sizeof(struct ospf_lsa_header)))
{
log(L_WARN "Received lsupd from %I is too short!", n->ip);
return;
}
OSPF_TRACE(D_PACKETS, "Received LS upd from %I", n->ip);
ospf_neigh_sm(n, INM_HELLOREC); /* Questionable */
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;
int diff=((u8 *)lsa)-((u8 *)ps);
u16 chsum, lenn = ntohs(lsa->length);
if(((diff+sizeof(struct ospf_lsa_header))>=size) || ((lenn+diff)>size))
{
log(L_WARN "Received lsupd from %I is too short!", n->ip);
ospf_neigh_sm(n, INM_BADLSREQ);
break;
}
if((lenn<=sizeof(struct ospf_lsa_header))||(lenn!=(4*(lenn/4))))
{
log(L_WARN "Received LSA from %I with bad length", n->ip);
ospf_neigh_sm(n, INM_BADLSREQ);
break;
}
/* pg 143 (1) */
chsum=lsa->checksum;
if(chsum!=lsasum_check(lsa,NULL,po))
{
log(L_WARN "Received bad lsa checksum from %I", n->ip);
continue;
}
/* pg 143 (2) */
if((lsa->type<LSA_T_RT)||(lsa->type>LSA_T_EXT))
{
log(L_WARN "Unknown LSA type from %I", n->ip);
continue;
}
/* pg 143 (3) */
if((lsa->type==LSA_T_EXT)&&oa->stub)
{
log(L_WARN "Received External LSA in stub area from %I", n->ip);
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);
#ifdef LOCAL_DEBUG
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);
#endif
/* pg 143 (4) */
if((lsatmp.age==LSA_MAXAGE)&&(lsadb==NULL)&&can_flush_lsa(oa))
{
ospf_lsack_enqueue(n, lsa, ACKL_DIRECT);
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 = (lsatmp.rt == p->cf->global->router_id);
DBG("PG143(5): Received LSA is newer\n");
/* 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;
break;
}
}
}
if(self)
{
struct top_hash_entry *en;
if((lsatmp.age==LSA_MAXAGE)&&(lsatmp.sn==LSA_MAXSEQNO))
{
ospf_lsack_enqueue(n, lsa, ACKL_DIRECT);
continue;
}
lsatmp.age=LSA_MAXAGE;
lsatmp.sn=LSA_MAXSEQNO;
lsa->age=htons(LSA_MAXAGE);
lsa->sn=htonl(LSA_MAXSEQNO);
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); /* 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))
{
flood_lsa(NULL,NULL,&en->lsa,po,NULL,oa,1);
}
continue;
}
/* pg 144 (5a) */
if(lsadb && ((now-lsadb->inst_t)<=MINLSARRIVAL)) /* FIXME: test for flooding? */
{
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"); /* ps 144(5e), pg 153 */
if(ifa->state==OSPF_IS_BACKUP)
{
if(ifa->drid==n->rid) ospf_lsack_enqueue(n, lsa, ACKL_DELAY);
}
else ospf_lsack_enqueue(n, lsa, ACKL_DELAY);
}
/* 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);
}
}
if((lsatmp.age==LSA_MAXAGE)&&(lsatmp.sn==LSA_MAXSEQNO)
&&lsadb&&can_flush_lsa(oa))
{
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));
ntohlsab(lsa+1,body,lsatmp.type,
lsatmp.length-sizeof(struct ospf_lsa_header));
lsadb=lsa_install_new(&lsatmp,body, oa);
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(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;
ospf_hash_delete(n->lsrth, en);
if(ifa->state==OSPF_IS_BACKUP)
{
if(n->rid==ifa->drid) ospf_lsack_enqueue(n, lsa, ACKL_DELAY);
}
}
else
{
/* pg145 (7b) */
ospf_lsack_enqueue(n, lsa, ACKL_DIRECT);
}
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);
}
}
/* Send direct LSAs */
ospf_lsack_send(n, ACKL_DIRECT);
if(n->state==NEIGHBOR_LOADING)
{
ospf_lsreq_send(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;
struct proto *p=&po->proto;
lsa->age=LSA_MAXAGE;
lsa->sn=LSA_MAXSEQNO;
lsasum_calculate(lsa,en->lsa_body,po);
OSPF_TRACE(D_EVENTS, "Premature aging self originated lsa!");
OSPF_TRACE(D_EVENTS, "Type: %d, Id: %I, Rt: %I", lsa->type,
lsa->id, lsa->rt);
flood_lsa(NULL,NULL,lsa,po,NULL,oa,0);
}
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