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ospfd: For an ABR, ensure the right LSID is MaxAge'd

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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>
This commit is contained in:
Pradosh Mohapatra 2014-04-28 10:58:06 +00:00 committed by David Lamparter
parent 8afee5c172
commit b4b359a265
2 changed files with 21 additions and 4 deletions
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9
lib/prefix.h
View file

@ -52,6 +52,7 @@ struct prefix
struct in_addr adv_router;
} lp;
u_char val[8];
uintptr_t ptr;
} u __attribute__ ((aligned (8)));
};
@ -89,6 +90,14 @@ struct prefix_rd
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

16
ospfd/ospf_lsa.c
View file

@ -2903,9 +2903,11 @@ void
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 @@ ospf_lsa_maxage_delete (struct ospf *ospf, struct ospf_lsa *lsa)
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 @@ ospf_lsa_maxage (struct ospf *ospf, struct ospf_lsa *lsa)
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