static unsigned int
ospf_nexthop_calculation (struct ospf_area *area, struct vertex *v,
struct vertex *w, struct router_lsa_link *l,
- unsigned int distance)
+ unsigned int distance, int lsa_pos)
{
struct listnode *node, *nnode;
struct vertex_nexthop *nh;
struct vertex_parent *vp;
struct ospf_interface *oi = NULL;
unsigned int added = 0;
+ char buf1[BUFSIZ];
+ char buf2[BUFSIZ];
if (IS_DEBUG_OSPF_EVENT)
{
the OSPF interface connecting to the destination network/router.
*/
+ /* we *must* be supplied with the link data */
+ assert (l != NULL);
+ oi = ospf_if_lookup_by_lsa_pos (area, lsa_pos);
+ if (!oi)
+ {
+ zlog_debug("%s: OI not found in LSA: lsa_pos:%d link_id:%s link_data:%s",
+ __func__, lsa_pos,
+ inet_ntop (AF_INET, &l->link_id, buf1, BUFSIZ),
+ inet_ntop (AF_INET, &l->link_data, buf2, BUFSIZ));
+ return 0;
+ }
+
+ if (IS_DEBUG_OSPF_EVENT)
+ {
+ zlog_debug("%s: considering link:%s "
+ "type:%d link_id:%s link_data:%s",
+ __func__, oi->ifp->name, l->m[0].type,
+ inet_ntop (AF_INET, &l->link_id, buf1, BUFSIZ),
+ inet_ntop (AF_INET, &l->link_data, buf2, BUFSIZ));
+ }
+
if (w->type == OSPF_VERTEX_ROUTER)
{
/* l is a link from v to w
* l2 will be link from w to v
*/
struct router_lsa_link *l2 = NULL;
-
- /* we *must* be supplied with the link data */
- assert (l != NULL);
-
- if (IS_DEBUG_OSPF_EVENT)
- {
- char buf1[BUFSIZ];
- char buf2[BUFSIZ];
-
- zlog_debug("ospf_nexthop_calculation(): considering link "
- "type %d link_id %s link_data %s",
- l->m[0].type,
- inet_ntop (AF_INET, &l->link_id, buf1, BUFSIZ),
- inet_ntop (AF_INET, &l->link_data, buf2, BUFSIZ));
- }
if (l->m[0].type == LSA_LINK_TYPE_POINTOPOINT)
{
+ struct in_addr nexthop;
+
/* If the destination is a router which connects to
the calculating router via a Point-to-MultiPoint
network, the destination's next hop IP address(es)
provides an IP address of the next hop router.
At this point l is a link from V to W, and V is the
- root ("us"). Find the local interface associated
- with l (its address is in l->link_data). If it
- is a point-to-multipoint interface, then look through
- the links in the opposite direction (W to V). If
- any of them have an address that lands within the
+ root ("us"). If it is a point-to-multipoint interface,
+ then look through the links in the opposite direction (W to V).
+ If any of them have an address that lands within the
subnet declared by the PtMP link, then that link
- is a constituent of the PtMP link, and its address is
+ is a constituent of the PtMP link, and its address is
a nexthop address for V.
*/
- oi = ospf_if_is_configured (area->ospf, &l->link_data);
- if (oi && oi->type == OSPF_IFTYPE_POINTOMULTIPOINT)
- {
- struct prefix_ipv4 la;
-
- la.family = AF_INET;
- la.prefixlen = oi->address->prefixlen;
-
- /* V links to W on PtMP interface
- - find the interface address on W */
- while ((l2 = ospf_get_next_link (w, v, l2)))
- {
- la.prefix = l2->link_data;
-
- if (prefix_cmp ((struct prefix *) &la,
- oi->address) == 0)
- /* link_data is on our PtMP network */
- break;
- }
- } /* end l is on point-to-multipoint link */
- else
- {
- /* l is a regular point-to-point link.
- Look for a link from W to V.
- */
- while ((l2 = ospf_get_next_link (w, v, l2)))
- {
- oi = ospf_if_is_configured (area->ospf,
- &(l2->link_data));
-
- if (oi == NULL)
- continue;
-
- if (!IPV4_ADDR_SAME (&oi->address->u.prefix4,
- &l->link_data))
- continue;
-
- break;
- }
- }
-
- if (oi && l2)
+ if (oi->type == OSPF_IFTYPE_POINTOPOINT)
+ {
+ added = 1;
+ nexthop.s_addr = 0; /* Nexthop not required */
+ }
+ else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT)
+ {
+ struct prefix_ipv4 la;
+
+ la.family = AF_INET;
+ la.prefixlen = oi->address->prefixlen;
+
+ /* V links to W on PtMP interface
+ - find the interface address on W */
+ while ((l2 = ospf_get_next_link (w, v, l2)))
+ {
+ la.prefix = l2->link_data;
+
+ if (prefix_cmp ((struct prefix *) &la,
+ oi->address) != 0)
+ continue;
+ /* link_data is on our PtMP network */
+ added = 1;
+ nexthop = l2->link_data;
+ break;
+ }
+ }
+
+ if (added)
{
/* found all necessary info to build nexthop */
nh = vertex_nexthop_new ();
nh->oi = oi;
- nh->router = l2->link_data;
+ nh->router = nexthop;
ospf_spf_add_parent (v, w, nh, distance);
return 1;
}
else
- zlog_info("ospf_nexthop_calculation(): "
- "could not determine nexthop for link");
+ zlog_info("%s: could not determine nexthop for link %s",
+ __func__, oi->ifp->name);
} /* end point-to-point link from V to W */
else if (l->m[0].type == LSA_LINK_TYPE_VIRTUALLINK)
{
else
{
assert(w->type == OSPF_VERTEX_NETWORK);
- oi = ospf_if_is_configured (area->ospf, &(l->link_data));
- if (oi)
- {
- nh = vertex_nexthop_new ();
- nh->oi = oi;
- nh->router.s_addr = 0;
- ospf_spf_add_parent (v, w, nh, distance);
- return 1;
- }
+
+ nh = vertex_nexthop_new ();
+ nh->oi = oi;
+ nh->router.s_addr = 0; /* Nexthop not required */
+ ospf_spf_add_parent (v, w, nh, distance);
+ return 1;
}
- zlog_info("ospf_nexthop_calculation(): "
- "Unknown attached link");
- return 0;
} /* end V is the root */
/* Check if W's parent is a network connected to root. */
else if (v->type == OSPF_VERTEX_NETWORK)
u_char *lim;
struct router_lsa_link *l = NULL;
struct in_addr *r;
- int type = 0;
+ int type = 0, lsa_pos=-1, lsa_pos_next=0;
/* If this is a router-LSA, and bit V of the router-LSA (see Section
A.4.2:RFC2328) is set, set Area A's TransitCapability to TRUE. */
{
l = (struct router_lsa_link *) p;
+ lsa_pos = lsa_pos_next; /* LSA link position */
+ lsa_pos_next++;
p += (OSPF_ROUTER_LSA_LINK_SIZE +
(l->m[0].tos_count * OSPF_ROUTER_LSA_TOS_SIZE));
w = ospf_vertex_new (w_lsa);
/* Calculate nexthop to W. */
- if (ospf_nexthop_calculation (area, v, w, l, distance))
+ if (ospf_nexthop_calculation (area, v, w, l, distance, lsa_pos))
pqueue_enqueue (w, candidate);
else if (IS_DEBUG_OSPF_EVENT)
zlog_debug ("Nexthop Calc failed");
{
/* Found an equal-cost path to W.
* Calculate nexthop of to W from V. */
- ospf_nexthop_calculation (area, v, w, l, distance);
+ ospf_nexthop_calculation (area, v, w, l, distance, lsa_pos);
}
/* less than. */
else
* valid nexthop it will call spf_add_parents, which
* will flush the old parents
*/
- if (ospf_nexthop_calculation (area, v, w, l, distance))
+ if (ospf_nexthop_calculation (area, v, w, l, distance, lsa_pos))
/* Decrease the key of the node in the heap.
* trickle-sort it up towards root, just in case this
* node should now be the new root due the cost change.
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