[PATCH libnftnl] src: enable set expiration date for set elements

[Laura Garcia Liebana <nevola@gmail.com>]

Currently, the expiration of every element in a set or map
is a read-only parameter generated at kernel side.

This change will permit to set a certain expiration date
per element that will be required, for example, during
stateful replication among several nodes.

This patch allows to propagate NFTA_SET_ELEM_EXPIRATION
from userspace to the kernel in order to set the
configured value.

Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
---
 src/set_elem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/set_elem.c b/src/set_elem.c
index ff983a6..4796524 100644
--- a/src/set_elem.c
+++ b/src/set_elem.c
@@ -126,6 +126,9 @@ int nftnl_set_elem_set(struct nftnl_set_elem *s, uint16_t attr,
 	case NFTNL_SET_ELEM_TIMEOUT:	/* NFTA_SET_ELEM_TIMEOUT */
 		memcpy(&s->timeout, data, sizeof(s->timeout));
 		break;
+	case NFTNL_SET_ELEM_EXPIRATION:	/* NFTA_SET_ELEM_EXPIRATION */
+		memcpy(&s->expiration, data, sizeof(s->expiration));
+		break;
 	case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
 		if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
 			xfree(s->user.data);
@@ -265,6 +268,8 @@ void nftnl_set_elem_nlmsg_build_payload(struct nlmsghdr *nlh,
 		mnl_attr_put_u32(nlh, NFTA_SET_ELEM_FLAGS, htonl(e->set_elem_flags));
 	if (e->flags & (1 << NFTNL_SET_ELEM_TIMEOUT))
 		mnl_attr_put_u64(nlh, NFTA_SET_ELEM_TIMEOUT, htobe64(e->timeout));
+	if (e->flags & (1 << NFTNL_SET_ELEM_EXPIRATION))
+		mnl_attr_put_u64(nlh, NFTA_SET_ELEM_EXPIRATION, htobe64(e->expiration));
 	if (e->flags & (1 << NFTNL_SET_ELEM_KEY)) {
 		struct nlattr *nest1;
 
-- 
2.11.0