[PATCH nft 6/7] rule: rework list chain

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

After this patch:

 # nft list chain inet filter forward
 table inet filter {
        chain forward {
                type filter hook forward priority 0; policy drop;
                ct state established,related counter packets 39546074 bytes 11566126287 accept
        }
 }

Before this patch, this was showing the full table definition, including
all chains, which is not what the user is asking for.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/rule.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/rule.c b/src/rule.c
index 08db38b..6d617d2 100644
--- a/src/rule.c
+++ b/src/rule.c
@@ -1062,6 +1062,26 @@ static void table_print_declaration(struct table *table)
 		table->handle.table);
 }
 
+static int do_list_chain(struct netlink_ctx *ctx, struct cmd *cmd,
+			 struct table *table)
+{
+	struct chain *chain;
+
+	table_print_declaration(table);
+
+	list_for_each_entry(chain, &table->chains, list) {
+		if (chain->handle.family != cmd->handle.family ||
+		    strcmp(cmd->handle.chain, chain->handle.chain) != 0)
+			continue;
+
+		chain_print(chain);
+	}
+
+	printf("}\n");
+
+	return 0;
+}
+
 static int do_list_chains(struct netlink_ctx *ctx, struct cmd *cmd)
 {
 	struct table *table;
@@ -1113,7 +1133,7 @@ static int do_command_list(struct netlink_ctx *ctx, struct cmd *cmd)
 			return do_list_tables(ctx, cmd);
 		return do_list_table(ctx, cmd, table);
 	case CMD_OBJ_CHAIN:
-		return do_list_table(ctx, cmd, table);
+		return do_list_chain(ctx, cmd, table);
 	case CMD_OBJ_CHAINS:
 		return do_list_chains(ctx, cmd);
 	case CMD_OBJ_SETS:
-- 
2.1.4