[PATCH nft 1/2] rule: add helper function to expand chain rules into commands

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

This patch adds a helper function to expand chain rules into commands.
This comes in preparation for the follow up patch.

Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 src/rule.c | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

diff --git a/src/rule.c b/src/rule.c
index a58fd1f2483a..3f239cf8c46a 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -1310,13 +1310,31 @@ void cmd_add_loc(struct cmd *cmd, uint16_t offset, const struct location *loc)
 	cmd->num_attrs++;
 }
 
+static void nft_cmd_expand_chain(struct chain *chain, struct list_head *new_cmds)
+{
+	struct rule *rule;
+	struct handle h;
+	struct cmd *new;
+
+	list_for_each_entry(rule, &chain->rules, list) {
+		memset(&h, 0, sizeof(h));
+		handle_merge(&h, &rule->handle);
+		if (chain->flags & CHAIN_F_BINDING) {
+			rule->handle.chain_id = chain->handle.chain_id;
+			rule->handle.chain.location = chain->location;
+		}
+		new = cmd_alloc(CMD_ADD, CMD_OBJ_RULE, &h,
+				&rule->location, rule_get(rule));
+		list_add_tail(&new->list, new_cmds);
+	}
+}
+
 void nft_cmd_expand(struct cmd *cmd)
 {
 	struct list_head new_cmds;
 	struct flowtable *ft;
 	struct table *table;
 	struct chain *chain;
-	struct rule *rule;
 	struct set *set;
 	struct obj *obj;
 	struct cmd *new;
@@ -1362,22 +1380,9 @@ void nft_cmd_expand(struct cmd *cmd)
 					&ft->location, flowtable_get(ft));
 			list_add_tail(&new->list, &new_cmds);
 		}
-		list_for_each_entry(chain, &table->chains, list) {
-			list_for_each_entry(rule, &chain->rules, list) {
-				memset(&h, 0, sizeof(h));
-				handle_merge(&h, &rule->handle);
-				if (chain->flags & CHAIN_F_BINDING) {
-					rule->handle.chain_id =
-						chain->handle.chain_id;
-					rule->handle.chain.location =
-						chain->location;
-				}
-				new = cmd_alloc(CMD_ADD, CMD_OBJ_RULE, &h,
-						&rule->location,
-						rule_get(rule));
-				list_add_tail(&new->list, &new_cmds);
-			}
-		}
+		list_for_each_entry(chain, &table->chains, list)
+			nft_cmd_expand_chain(chain, &new_cmds);
+
 		list_splice(&new_cmds, &cmd->list);
 		break;
 	case CMD_OBJ_SET:
-- 
2.30.2