ospfd: For an ABR, ensure the right LSID is MaxAge'd
PROBLEM:
Accurate garbage collection of maxage LSAs. The global OSPF structure has
a maxage_lsa tree - the key to the tree is <ls-id, adv-router> tuple. Suppose
the ABR has multiple areas and has originated some intra-area LSAs. The
key for all those LSAs is the same. The code then ends up in a state where
all but the first LSA do not get cleaned up from the areas' LSDB. A subsequent
event would readvertise those LSAs.
PATCH:
Since the LSA is going to stick around till it actually gets cleaned up by
the maxage_walker, make the LSA pointer as the key. Each distinct LSA that
gets maxage'd then gets added to the tree and will get cleaned up correctly.
Signed-off-by: Pradosh Mohapatra <pmohapat@cumulusnetworks.com>
[CF: Use CHAR_BIT; use uintptr_t; use sizeof(field) instead of sizeof(type)]
Signed-off-by: Christian Franke <chris@opensourcerouting.org>
[DL: this must remain a temporary fix! needs to be redone after 0.99.23]
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/lib/prefix.h b/lib/prefix.h
index 9ef70ff..45889e0 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -52,6 +52,7 @@
struct in_addr adv_router;
} lp;
u_char val[8];
+ uintptr_t ptr;
} u __attribute__ ((aligned (8)));
};
@@ -89,6 +90,14 @@
u_char val[8] __attribute__ ((aligned (8)));
};
+/* Prefix for a generic pointer */
+struct prefix_ptr
+{
+ u_char family;
+ u_char prefixlen;
+ uintptr_t prefix __attribute__ ((aligned (8)));
+};
+
/* helper to get type safety/avoid casts on calls
* (w/o this, functions accepting all prefix types need casts on the caller
* side, which strips type safety since the cast will accept any pointer
diff --git a/ospfd/ospf_lsa.c b/ospfd/ospf_lsa.c
index 3696551..0a66b1d 100644
--- a/ospfd/ospf_lsa.c
+++ b/ospfd/ospf_lsa.c
@@ -2903,9 +2903,11 @@
ospf_lsa_maxage_delete (struct ospf *ospf, struct ospf_lsa *lsa)
{
struct route_node *rn;
- struct prefix_ls lsa_prefix;
+ struct prefix_ptr lsa_prefix;
- ls_prefix_set (&lsa_prefix, lsa);
+ lsa_prefix.family = 0;
+ lsa_prefix.prefixlen = sizeof(lsa_prefix.prefix) * CHAR_BIT;
+ lsa_prefix.prefix = (uintptr_t) lsa;
if ((rn = route_node_lookup(ospf->maxage_lsa,
(struct prefix *)&lsa_prefix)))
@@ -2929,7 +2931,7 @@
void
ospf_lsa_maxage (struct ospf *ospf, struct ospf_lsa *lsa)
{
- struct prefix_ls lsa_prefix;
+ struct prefix_ptr lsa_prefix;
struct route_node *rn;
/* When we saw a MaxAge LSA flooded to us, we put it on the list
@@ -2942,12 +2944,18 @@
return;
}
- ls_prefix_set (&lsa_prefix, lsa);
+ lsa_prefix.family = 0;
+ lsa_prefix.prefixlen = sizeof(lsa_prefix.prefix) * CHAR_BIT;
+ lsa_prefix.prefix = (uintptr_t) lsa;
+
if ((rn = route_node_get (ospf->maxage_lsa,
(struct prefix *)&lsa_prefix)) != NULL)
{
if (rn->info != NULL)
{
+ if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
+ zlog_debug ("LSA[%s]: found LSA (%p) in table for LSA %p %d",
+ dump_lsa_key (lsa), rn->info, lsa, lsa_prefix.prefixlen);
route_unlock_node (rn);
}
else