mnl: consistency checks across several netlink dumps

Obtain the generation ID before dumping the object lists. Then,
check for generation ID updates when dumping the several lists that
this needs. In case of interference, nft has to remove the stale
objects and retry from scratch.

This is complementary to the NLM_F_DUMP_INTR flag which is local
to one single netlink dump.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/include/mnl.h b/include/mnl.h
index ed5a718b..03d1876e 100644
--- a/include/mnl.h
+++ b/include/mnl.h
@@ -6,6 +6,7 @@
 struct mnl_socket;
 
 uint32_t mnl_seqnum_alloc(void);
+void mnl_genid_get(struct mnl_socket *nf_sock);
 
 struct mnl_err {
 	struct list_head	head;