struct ospf_interface *
ospf_if_lookup_by_prefix (struct ospf *ospf, struct prefix_ipv4 *p)
{
struct listnode *node;
struct ospf_interface *oi;
struct prefix ptmp;
/* Check each Interface. */
for (node = listhead (ospf->oiflist); node; nextnode (node))
{
if ((oi = getdata (node)) != NULL && oi->type != OSPF_IFTYPE_VIRTUALLINK)
{
if ((oi->type == OSPF_IFTYPE_POINTOPOINT) &&
CONNECTED_DEST_HOST(oi->connected))
{
prefix_copy (&ptmp, oi->connected->destination);
ptmp.prefixlen = IPV4_MAX_BITLEN;
}
else
prefix_copy (&ptmp, oi->address);
apply_mask (&ptmp);
if (prefix_same (&ptmp, (struct prefix *) p))
return oi;
}
}
return NULL;
}
/* determine receiving interface by source of packet */
struct ospf_interface *
ospf_if_lookup_recv_if (struct ospf *ospf, struct in_addr src)
{
struct listnode *node;
struct prefix_ipv4 addr;
struct ospf_interface *oi, *match;
addr.family = AF_INET;
addr.prefix = src;
addr.prefixlen = IPV4_MAX_BITLEN;
match = NULL;
for (ALL_LIST_ELEMENTS_RO (ospf->oiflist, node, oi))
{
if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
continue;
if (if_is_loopback (oi->ifp))
continue;
if ((oi->type == OSPF_IFTYPE_POINTOPOINT) &&
CONNECTED_DEST_HOST(oi->connected))
{
if (IPV4_ADDR_SAME (&oi->connected->destination->u.prefix4, &src))
return oi;
}
else
{
if (prefix_match (oi->address, (struct prefix *) &addr))
{
if ( (match == NULL) ||
(match->address->prefixlen < oi->address->prefixlen)
)
match = oi;
}
}
}
return match;
}
/*
* check if interface with given address is configured and
* return it if yes. special treatment for PtP networks.
*/
struct ospf_interface *
ospf_if_is_configured (struct ospf *ospf, struct in_addr *address)
{
struct listnode *node;
struct ospf_interface *oi;
struct prefix_ipv4 addr;
addr.family = AF_INET;
addr.prefix = *address;
addr.prefixlen = IPV4_MAX_PREFIXLEN;
for (node = listhead (ospf->oiflist); node; nextnode (node))
if ((oi = getdata (node)) != NULL && oi->type != OSPF_IFTYPE_VIRTUALLINK)
{
if (oi->type == OSPF_IFTYPE_POINTOPOINT)
{
if (CONNECTED_DEST_HOST(oi->connected))
{
/* match only destination addr, since local addr is most likely
* not unique (borrowed from another interface) */
if (IPV4_ADDR_SAME (address,
&oi->connected->destination->u.prefix4))
return oi;
}
else
{
/* special leniency: match if addr is anywhere on PtP subnet */
if (prefix_match(oi->address,(struct prefix *)&addr))
return oi;
}
}
else
{
if (IPV4_ADDR_SAME (address, &oi->address->u.prefix4))
return oi;
}
}
return NULL;
}
