nft: Introduce struct nft_chain

Preparing for ordered output of user-defined chains, introduce a local
datatype wrapping nftnl_chain. In order to maintain the chain name hash
table, introduce nft_chain_list as well and use it instead of
nftnl_chain_list.

Signed-off-by: Phil Sutter <phil@nwl.cc>

1 files changed, 59 insertions, 0 deletions

diff --git a/iptables/nft-chain.c b/iptables/nft-chain.c
new file mode 100644
index 00000000..e954170f
--- /dev/null
+++ b/iptables/nft-chain.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2020  Red Hat GmbH.  Author: Phil Sutter <phil@nwl.cc>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdlib.h>
+#include <xtables.h>
+
+#include "nft-chain.h"
+
+struct nft_chain *nft_chain_alloc(struct nftnl_chain *nftnl)
+{
+	struct nft_chain *c = xtables_malloc(sizeof(*c));
+
+	INIT_LIST_HEAD(&c->head);
+	c->nftnl = nftnl;
+
+	return c;
+}
+
+void nft_chain_free(struct nft_chain *c)
+{
+	if (c->nftnl)
+		nftnl_chain_free(c->nftnl);
+	free(c);
+}
+
+struct nft_chain_list *nft_chain_list_alloc(void)
+{
+	struct nft_chain_list *list = xtables_malloc(sizeof(*list));
+	int i;
+
+	INIT_LIST_HEAD(&list->list);
+	for (i = 0; i < CHAIN_NAME_HSIZE; i++)
+		INIT_HLIST_HEAD(&list->names[i]);
+
+	return list;
+}
+
+void nft_chain_list_del(struct nft_chain *c)
+{
+	list_del(&c->head);
+	hlist_del(&c->hnode);
+}
+
+void nft_chain_list_free(struct nft_chain_list *list)
+{
+	struct nft_chain *c, *c2;
+
+	list_for_each_entry_safe(c, c2, &list->list, head) {
+		nft_chain_list_del(c);
+		nft_chain_free(c);
+	}
+	free(list);
+}