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-rw-r--r--nest/rt-table.c29
1 files changed, 25 insertions, 4 deletions
diff --git a/nest/rt-table.c b/nest/rt-table.c
index 186a2dc..a8d0fee 100644
--- a/nest/rt-table.c
+++ b/nest/rt-table.c
@@ -403,6 +403,26 @@ rte_recalculate(rtable *table, net *net, struct proto *p, struct proto *src, rte
{
if (old->attrs->proto == src)
{
+ /* If there is the same route in the routing table but from
+ * a different sender, then there are two paths from the
+ * source protocol to this routing table through transparent
+ * pipes, which is not allowed.
+ *
+ * We log that and ignore the route. If it is withdraw, we
+ * ignore it completely (there might be 'spurious withdraws',
+ * see FIXME in do_rte_announce())
+ */
+ if (old->sender != p)
+ {
+ if (new)
+ {
+ log(L_ERR "Pipe collision detected when sending %I/%d to table %s",
+ net->n.prefix, net->n.pxlen, table->name);
+ rte_free_quick(new);
+ }
+ return;
+ }
+
if (new && rte_same(old, new))
{
/* No changes, ignore the new route */
@@ -597,11 +617,12 @@ rte_update(rtable *table, net *net, struct proto *p, struct proto *src, rte *new
new->sender = p;
struct filter *filter = p->in_filter;
- /* Do not filter routes going to the secondary side of the pipe,
- that should only go through export filter.
- FIXME Make a better check whether p is really a pipe. */
- if (p->table != table)
+ /* Do not filter routes going through the pipe,
+ they are filtered in the export filter only. */
+#ifdef CONFIG_PIPE
+ if (p->proto == &proto_pipe)
filter = FILTER_ACCEPT;
+#endif
p->stats.imp_updates_received++;
if (!rte_validate(new))