[PATCH nft 3/4] src: delete devices to an existing flowtable

[Pablo Neira Ayuso <pablo@netfilter.org>]

This patch allows you to remove a device to an existing flowtable:

 # nft delete flowtable x y { devices = { eth0 } \;  }

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/mnl.c          | 11 +++++++++++
 src/parser_bison.y |  7 +++++++
 2 files changed, 18 insertions(+)

diff --git a/src/mnl.c b/src/mnl.c
index 8f8fcc2c7ae0..759ae41ceb01 100644
--- a/src/mnl.c
+++ b/src/mnl.c
@@ -1682,6 +1682,7 @@ int mnl_nft_flowtable_add(struct netlink_ctx *ctx, struct cmd *cmd,
 int mnl_nft_flowtable_del(struct netlink_ctx *ctx, struct cmd *cmd)
 {
 	struct nftnl_flowtable *flo;
+	const char **dev_array;
 	struct nlmsghdr *nlh;
 
 	flo = nftnl_flowtable_alloc();
@@ -1691,6 +1692,16 @@ int mnl_nft_flowtable_del(struct netlink_ctx *ctx, struct cmd *cmd)
 	nftnl_flowtable_set_u32(flo, NFTNL_FLOWTABLE_FAMILY,
 				cmd->handle.family);
 
+	if (cmd->flowtable && cmd->flowtable->dev_expr) {
+		nftnl_flowtable_set_u32(flo, NFTNL_FLOWTABLE_HOOKNUM, 0);
+		nftnl_flowtable_set_u32(flo, NFTNL_FLOWTABLE_PRIO, 0);
+
+		dev_array = nft_flowtable_dev_array(cmd);
+		nftnl_flowtable_set_data(flo, NFTNL_FLOWTABLE_DEVICES,
+					 dev_array, 0);
+		nft_flowtable_dev_array_free(dev_array);
+	}
+
 	nlh = nftnl_nlmsg_build_hdr(nftnl_batch_buffer(ctx->batch),
 				    NFT_MSG_DELFLOWTABLE, cmd->handle.family,
 				    0, ctx->seqnum);
diff --git a/src/parser_bison.y b/src/parser_bison.y
index 8e937ca305d1..461d9bf24d95 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -1179,6 +1179,13 @@ delete_cmd		:	TABLE		table_spec
 			{
 				$$ = cmd_alloc(CMD_DELETE, CMD_OBJ_FLOWTABLE, &$2, &@$, NULL);
 			}
+			|	FLOWTABLE	flowtable_spec	flowtable_block_alloc
+						'{'	flowtable_block	'}'
+			{
+				$5->location = @5;
+				handle_merge(&$3->handle, &$2);
+				$$ = cmd_alloc(CMD_DELETE, CMD_OBJ_FLOWTABLE, &$2, &@$, $5);
+			}
 			|	COUNTER		obj_spec
 			{
 				$$ = cmd_alloc(CMD_DELETE, CMD_OBJ_COUNTER, &$2, &@$, NULL);
-- 
2.20.1