diff options
Diffstat (limited to 'nest/rt-table.c')
| -rw-r--r-- | nest/rt-table.c | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/nest/rt-table.c b/nest/rt-table.c index 0c0e365e..9ce52428 100644 --- a/nest/rt-table.c +++ b/nest/rt-table.c @@ -549,29 +549,29 @@ rt_notify_basic(struct channel *c, net *net, rte *new0, rte *old0, int refeed) c->stats.exp_withdraws_received++; /* - * This is a tricky part - we don't know whether route 'old' was - * exported to protocol 'p' or was filtered by the export filter. - * We try to run the export filter to know this to have a correct - * value in 'old' argument of rte_update (and proper filter value) + * This is a tricky part - we don't know whether route 'old' was exported to + * protocol 'p' or was filtered by the export filter. We try to run the export + * filter to know this to have a correct value in 'old' argument of rte_update + * (and proper filter value). * - * FIXME - this is broken because 'configure soft' may change - * filters but keep routes. Refeed is expected to be called after - * change of the filters and with old == new, therefore we do not - * even try to run the filter on an old route, This may lead to - * 'spurious withdraws' but ensure that there are no 'missing + * This is broken because 'configure soft' may change filters but keep routes. + * Refeed cycle is expected to be called after change of the filters and with + * old == new, therefore we do not even try to run the filter on an old route. + * This may lead to 'spurious withdraws' but ensure that there are no 'missing * withdraws'. * - * This is not completely safe as there is a window between - * reconfiguration and the end of refeed - if a newly filtered - * route disappears during this period, proper withdraw is not - * sent (because old would be also filtered) and the route is - * not refeeded (because it disappeared before that). + * This is not completely safe as there is a window between reconfiguration + * and the end of refeed - if a newly filtered route disappears during this + * period, proper withdraw is not sent (because old would be also filtered) + * and the route is not refeeded (because it disappeared before that). + * Therefore, we also do not try to run the filter on old routes that are + * older than the last filter change. */ if (new) new = export_filter(c, new, &new_free, 0); - if (old && !refeed) + if (old && !(refeed || (old->lastmod <= c->last_tx_filter_change))) old = export_filter(c, old, &old_free, 1); if (!new && !old) |