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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"
/* Note, that h is in network endianity! */
void
ospf_lsack_direct_tx(struct ospf_neighbor *n,struct ospf_lsa_header *h)
{
struct ospf_packet *op;
struct ospf_lsack_packet *pk;
sock *sk=n->ifa->ip_sk;
struct proto *p=&n->ifa->proto->proto;
u16 len;
DBG("Sending direct ACK to %I for Type: %u, ID: %I, RT: %I\n",n->rid,
h->type, ntohl(h->id), ntohl(h->rt));
pk=(struct ospf_lsack_packet *)sk->tbuf;
op=(struct ospf_packet *)sk->tbuf;
fill_ospf_pkt_hdr(n->ifa, pk, LSACK_P);
memcpy(pk+1,h,sizeof(struct ospf_lsa_header));
len=sizeof(struct ospf_lsack_packet)+sizeof(struct ospf_lsa_header);
op->length=htons(len);
ospf_pkt_finalize(n->ifa, op);
sk_send_to(sk,len, n->ip, OSPF_PROTO);
OSPF_TRACE(D_PACKETS, "LS ack sent to %I", n->ip);
}
void
ospf_lsa_delay(struct ospf_neighbor *n,struct ospf_lsa_header *h,
struct proto *p)
{
struct lsah_n *no;
no=mb_alloc(p->pool,sizeof(struct lsah_n));
memcpy(&no->lsa,h,sizeof(struct ospf_lsa_header));
add_tail(&n->ackl, NODE no);
DBG("Adding delay ack for %I, ID: %I, RT: %I, Type: %u\n",n->rid,
ntohl(h->id), ntohl(h->rt),h->type);
}
void
ackd_timer_hook(timer *t)
{
struct ospf_neighbor *n=t->data;
if(!EMPTY_LIST(n->ackl)) ospf_lsack_delay_tx(n);
}
void
ospf_lsack_delay_tx(struct ospf_neighbor *n)
{
struct ospf_packet *op;
struct ospf_lsack_packet *pk;
sock *sk;
u16 len,i=0;
struct ospf_lsa_header *h;
struct lsah_n *no;
struct ospf_iface *ifa=n->ifa;
struct proto *p=&n->ifa->proto->proto;
OSPF_TRACE(D_PACKETS, "LS ack sent to %I (delayed)",n->ip);
if(ifa->type==OSPF_IT_BCAST)
{
sk=ifa->hello_sk;
}
else
{
sk=ifa->ip_sk;
}
pk=(struct ospf_lsack_packet *)sk->tbuf;
op=(struct ospf_packet *)sk->tbuf;
fill_ospf_pkt_hdr(n->ifa, pk, LSACK_P);
h=(struct ospf_lsa_header *)(pk+1);
while(!EMPTY_LIST(n->ackl))
{
no=(struct lsah_n *)HEAD(n->ackl);
memcpy(h+i,&no->lsa, sizeof(struct ospf_lsa_header));
i++;
DBG("Iter %u ID: %I, RT: %I, Type: %u\n",i, ntohl((h+i)->id),
ntohl((h+i)->rt),(h+i)->type);
rem_node(NODE no);
mb_free(no);
if((i*sizeof(struct ospf_lsa_header)+sizeof(struct ospf_lsack_packet)+SIPH)>
n->ifa->iface->mtu)
{
if(!EMPTY_LIST(n->ackl))
{
len=sizeof(struct ospf_lsack_packet)+i*sizeof(struct ospf_lsa_header);
op->length=htons(len);
ospf_pkt_finalize(n->ifa, op);
DBG("Sending and continueing! Len=%u\n",len);
if(ifa->type==OSPF_IT_BCAST)
{
if((ifa->state==OSPF_IS_DR)||(ifa->state==OSPF_IS_BACKUP))
{
sk_send_to(sk ,len, AllSPFRouters, OSPF_PROTO);
}
else
{
sk_send_to(sk ,len, AllDRouters, OSPF_PROTO);
}
}
else
{
if((ifa->state==OSPF_IS_DR)||(ifa->state==OSPF_IS_BACKUP))
{
sk_send_to_agt(sk, len, ifa, NEIGHBOR_EXCHANGE);
}
else
{
sk_send_to_bdr(sk, len, ifa);
}
}
fill_ospf_pkt_hdr(n->ifa, pk, LSACK_P);
i=0;
}
}
}
len=sizeof(struct ospf_lsack_packet)+i*sizeof(struct ospf_lsa_header);
op->length=htons(len);
ospf_pkt_finalize(n->ifa, op);
DBG("Sending! Len=%u\n",len);
if(ifa->type==OSPF_IT_BCAST)
{
if((ifa->state==OSPF_IS_DR)||(ifa->state==OSPF_IS_BACKUP))
{
sk_send_to(sk ,len, AllSPFRouters, OSPF_PROTO);
}
else
{
sk_send_to(sk ,len, AllDRouters, OSPF_PROTO);
}
}
else
{
sk_send_to_agt(sk, len, ifa, NEIGHBOR_EXCHANGE);
}
}
void
ospf_lsack_rx(struct ospf_lsack_packet *ps, struct proto *p,
struct ospf_iface *ifa, u16 size)
{
u32 nrid, myrid;
struct ospf_neighbor *n;
struct ospf_lsa_header lsa,*plsa;
int length;
u16 nolsa,i;
struct top_hash_entry *en;
u16 lenn=ntohs(ps->ospf_packet.length);
nrid=ntohl(ps->ospf_packet.routerid);
myrid=p->cf->global->router_id;
if((n=find_neigh(ifa, nrid))==NULL)
{
OSPF_TRACE(D_PACKETS, "Received LS ack from unknown neigbor! (%I)",
nrid);
return ;
}
OSPF_TRACE(D_PACKETS, "Received LS ack from %I", n->ip);
ospf_neigh_sm(n, INM_HELLOREC);
if(n->state<NEIGHBOR_EXCHANGE) return;
nolsa=(lenn-sizeof(struct ospf_lsack_packet))/
sizeof(struct ospf_lsa_header);
if((nolsa<1)||((lenn-sizeof(struct ospf_lsack_packet))!=
(nolsa*sizeof(struct ospf_lsa_header))))
{
log("%s: Received corrupted LS ack from %I", p->name, n->ip);
return;
}
plsa=(struct ospf_lsa_header *)(ps+1);
for(i=0;i<nolsa;i++)
{
ntohlsah(plsa+i,&lsa);
if((en=ospf_hash_find_header(n->lsrth,&lsa))==NULL) continue;
if(lsa_comp(&lsa,&en->lsa)!=CMP_SAME)
{
if((lsa.sn==LSA_MAXSEQNO)&&(lsa.age==LSA_MAXAGE)) continue;
OSPF_TRACE(D_PACKETS, "Strange LS acknoledgement from %I",n->ip);
OSPF_TRACE(D_PACKETS, "Id: %I, Rt: %I, Type: %u",
lsa.id,lsa.rt,lsa.type);
OSPF_TRACE(D_PACKETS, "I have: Age: %4u, Seqno: 0x%08x, Sum: %u",
en->lsa.age, en->lsa.sn, en->lsa.checksum);
OSPF_TRACE(D_PACKETS, "He has: Age: %4u, Seqno: 0x%08x, Sum: %u",
lsa.age,lsa.sn,lsa.checksum);
continue;
}
DBG("Deleting LS Id: %I RT: %I Type: %u from LS Retl for neighbor %I\n",
lsa.id,lsa.rt,lsa.type,n->rid);
s_rem_node(SNODE en);
ospf_hash_delete(n->lsrth,en);
}
}
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