[PATCH nft,v2] rule: flush set cache before flush command

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

Flush the set cache before adding the flush command to the netlink batch.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v2: add testcase.

 src/rule.c                                       | 16 ++++++++++++++++
 tests/shell/testcases/sets/0052overlap_0         | 16 ++++++++++++++++
 .../shell/testcases/sets/dumps/0052overlap_0.nft |  8 ++++++++
 3 files changed, 40 insertions(+)
 create mode 100755 tests/shell/testcases/sets/0052overlap_0
 create mode 100644 tests/shell/testcases/sets/dumps/0052overlap_0.nft

diff --git a/src/rule.c b/src/rule.c
index fa1861403ba1..6b71dfee0d09 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -2692,6 +2692,21 @@ static int do_command_reset(struct netlink_ctx *ctx, struct cmd *cmd)
 	return do_list_obj(ctx, cmd, type);
 }
 
+static void flush_set_cache(struct netlink_ctx *ctx, struct cmd *cmd)
+{
+	struct table *table;
+	struct set *set;
+
+	table = table_lookup(&cmd->handle, &ctx->nft->cache);
+	assert(table);
+	set = set_lookup(table, cmd->handle.set.name);
+	assert(set);
+	if (set->init != NULL) {
+		expr_free(set->init);
+		set->init = NULL;
+	}
+}
+
 static int do_command_flush(struct netlink_ctx *ctx, struct cmd *cmd)
 {
 	switch (cmd->obj) {
@@ -2701,6 +2716,7 @@ static int do_command_flush(struct netlink_ctx *ctx, struct cmd *cmd)
 	case CMD_OBJ_SET:
 	case CMD_OBJ_MAP:
 	case CMD_OBJ_METER:
+		flush_set_cache(ctx, cmd);
 		return mnl_nft_setelem_flush(ctx, cmd);
 	case CMD_OBJ_RULESET:
 		return mnl_nft_table_del(ctx, cmd);
diff --git a/tests/shell/testcases/sets/0052overlap_0 b/tests/shell/testcases/sets/0052overlap_0
new file mode 100755
index 000000000000..c2960945c492
--- /dev/null
+++ b/tests/shell/testcases/sets/0052overlap_0
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -e
+
+EXPECTED="add table ip filter
+add set ip filter w_all {type ipv4_addr; flags interval; auto-merge}
+add element ip filter w_all {10.10.10.10, 10.10.10.11}
+"
+
+$NFT -f - <<< "$EXPECTED"
+
+EXPECTED="flush set ip filter w_all
+add element ip filter w_all {10.10.10.10, 10.10.10.253}
+"
+
+$NFT -f - <<< "$EXPECTED"
diff --git a/tests/shell/testcases/sets/dumps/0052overlap_0.nft b/tests/shell/testcases/sets/dumps/0052overlap_0.nft
new file mode 100644
index 000000000000..1cc02ada94b8
--- /dev/null
+++ b/tests/shell/testcases/sets/dumps/0052overlap_0.nft
@@ -0,0 +1,8 @@
+table ip filter {
+	set w_all {
+		type ipv4_addr
+		flags interval
+		auto-merge
+		elements = { 10.10.10.10, 10.10.10.253 }
+	}
+}
-- 
2.20.1