conntrackd: flush operation use the child process and origin infrastructure

With this patch, the flush operation is performed by a child process.
Thus, the parent process digests destroy events that ctnetlink reports
back and, thanks to the origin infrastructure, we skip the messy
implicit synchronization that are triggered by such events.

This patch requires a Linux kernel >= 2.6.29 to benefit from this
change, otherwise it has no effect.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/origin.h b/include/origin.h
index b2d1823..89308f3 100644
--- a/include/origin.h
+++ b/include/origin.h
@@ -5,6 +5,7 @@ enum {
 	CTD_ORIGIN_NOT_ME = 0,		/* this event comes from the kernel or
 					   any process, but not conntrackd */
 	CTD_ORIGIN_COMMIT,		/* event comes from committer */
+	CTD_ORIGIN_FLUSH,		/* event comes from flush */
 };
 
 int origin_register(struct nfct_handle *h, int origin_type);