[iptables PATCH v3 05/11] nft-cache: Fetch only chains in nft_chain_list_get()

[Phil Sutter <phil@nwl.cc>]

The function is used to return the given table's chains, so fetching
chain cache is enough.

Add calls to nft_build_cache() in places where a rule cache is required.

Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 iptables/nft-cache.c |  2 +-
 iptables/nft.c       | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/iptables/nft-cache.c b/iptables/nft-cache.c
index 22a87e94efd76..5f27aec6d9c30 100644
--- a/iptables/nft-cache.c
+++ b/iptables/nft-cache.c
@@ -390,7 +390,7 @@ struct nftnl_chain_list *nft_chain_list_get(struct nft_handle *h,
 	if (!t)
 		return NULL;
 
-	nft_build_cache(h);
+	__nft_build_cache(h, NFT_CL_CHAINS);
 
 	return h->cache->table[t->type].chains;
 }
diff --git a/iptables/nft.c b/iptables/nft.c
index 81de10d8a0892..94fabd78e527e 100644
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -1173,6 +1173,14 @@ nft_rule_append(struct nft_handle *h, const char *chain, const char *table,
 
 	nft_xt_builtin_init(h, table);
 
+	/* Since ebtables user-defined chain policies are implemented as last
+	 * rule in nftables, rule cache is required here to treat them right. */
+	if (h->family == NFPROTO_BRIDGE) {
+		c = nft_chain_find(h, table, chain);
+		if (c && !nft_chain_builtin(c))
+			nft_build_cache(h);
+	}
+
 	nft_fn = nft_rule_append;
 
 	r = nft_rule_new(h, chain, table, data);
@@ -1397,6 +1405,8 @@ int nft_rule_save(struct nft_handle *h, const char *table, unsigned int format)
 	struct nftnl_chain *c;
 	int ret = 0;
 
+	nft_build_cache(h);
+
 	list = nft_chain_list_get(h, table);
 	if (!list)
 		return 0;
@@ -1595,6 +1605,10 @@ static int __nft_chain_user_del(struct nftnl_chain *c, void *data)
 		fprintf(stdout, "Deleting chain `%s'\n",
 			nftnl_chain_get_str(c, NFTNL_CHAIN_NAME));
 
+	/* This triggers required policy rule deletion. */
+	if (h->family == NFPROTO_BRIDGE)
+		nft_build_cache(h);
+
 	/* XXX This triggers a fast lookup from the kernel. */
 	nftnl_chain_unset(c, NFTNL_CHAIN_HANDLE);
 	ret = batch_chain_add(h, NFT_COMPAT_CHAIN_USER_DEL, c);
@@ -1876,6 +1890,8 @@ nft_rule_find(struct nft_handle *h, struct nftnl_chain *c, void *data, int rulen
 	struct nftnl_rule_iter *iter;
 	bool found = false;
 
+	nft_build_cache(h);
+
 	if (rulenum >= 0)
 		/* Delete by rule number case */
 		return nftnl_rule_lookup_byindex(c, rulenum);
@@ -2701,6 +2717,8 @@ int ebt_set_user_chain_policy(struct nft_handle *h, const char *table,
 	else
 		return 0;
 
+	nft_build_cache(h);
+
 	nftnl_chain_set_u32(c, NFTNL_CHAIN_POLICY, pval);
 	return 1;
 }
@@ -3038,6 +3056,8 @@ static int nft_is_chain_compatible(struct nftnl_chain *c, void *data)
 	enum nf_inet_hooks hook;
 	int prio;
 
+	nft_build_cache(h);
+
 	if (nftnl_rule_foreach(c, nft_is_rule_compatible, NULL))
 		return -1;
 
-- 
2.23.0