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Fix minor issue in pipe route propagation

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In some circumstances during reconfiguration, routes propagated by pipes
to other tables may hang there even after the primary routes are removed.

There is already a workaround for this issue in the code which removes
these stale routes by flush process when source protocols are shut down.

This patch is a cleaner fix and allows to simplify the flush process
This commit is contained in:
Ondrej Zajicek 2015-05-16 20:17:59 +02:00
parent 38e835dede
commit 86f567e13c
1 changed files with 23 additions and 4 deletions
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27
nest/rt-table.c
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@ -347,11 +347,13 @@ do_rt_notify(struct announce_hook *ah, net *net, rte *new, rte *old, ea_list *tm
}
static void
rt_notify_basic(struct announce_hook *ah, net *net, rte *new, rte *old, ea_list *tmpa, int refeed)
rt_notify_basic(struct announce_hook *ah, net *net, rte *new0, rte *old0, ea_list *tmpa, int refeed)
{
// struct proto *p = ah->proto;
struct proto *p = ah->proto;
struct proto_stats *stats = ah->stats;
rte *new = new0;
rte *old = old0;
rte *new_free = NULL;
rte *old_free = NULL;
@ -369,7 +371,7 @@ rt_notify_basic(struct announce_hook *ah, net *net, rte *new, rte *old, ea_list
* 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
* even try to run the filter on an old route, This may lead to
* 'spurious withdraws' but ensure that there are no 'missing
* withdraws'.
*
@ -386,9 +388,26 @@ rt_notify_basic(struct announce_hook *ah, net *net, rte *new, rte *old, ea_list
if (old && !refeed)
old = export_filter(ah, old, &old_free, NULL, 1);
/* FIXME - This is broken because of incorrect 'old' value (see above) */
if (!new && !old)
{
/*
* As mentioned above, 'old' value may be incorrect in some race conditions.
* We generally ignore it with the exception of withdraw to pipe protocol.
* In that case we rather propagate unfiltered withdraws regardless of
* export filters to ensure that when a protocol is flushed, its routes are
* removed from all tables. Possible spurious unfiltered withdraws are not
* problem here as they are ignored if there is no corresponding route at
* the other end of the pipe. We directly call rt_notify() hook instead of
* do_rt_notify() to avoid logging and stat counters.
*/
#ifdef CONFIG_PIPE
if ((p->proto == &proto_pipe) && !new0 && (p != old0->sender->proto))
p->rt_notify(p, ah->table, net, NULL, old0, NULL);
#endif
return;
}
do_rt_notify(ah, net, new, old, tmpa, refeed);