xtables: introduce save_chain callback

In preparation for ebtables-save implementation, introduce a callback
for convenient per-family formatting of chains in save output.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 11 insertions, 0 deletions

diff --git a/iptables/nft-shared.c b/iptables/nft-shared.c
index 60b539c8..66db7ed1 100644
--- a/iptables/nft-shared.c
+++ b/iptables/nft-shared.c
@@ -16,6 +16,7 @@
 #include <stdbool.h>
 #include <netdb.h>
 #include <errno.h>
+#include <inttypes.h>
 
 #include <xtables.h>
 
@@ -802,6 +803,16 @@ void save_counters(const void *data)
 			       (unsigned long long)cs->counters.bcnt);
 }
 
+void nft_ipv46_save_chain(const struct nftnl_chain *c, const char *policy)
+{
+	const char *chain = nftnl_chain_get_str(c, NFTNL_CHAIN_NAME);
+	uint64_t pkts = nftnl_chain_get_u64(c, NFTNL_CHAIN_PACKETS);
+	uint64_t bytes = nftnl_chain_get_u64(c, NFTNL_CHAIN_BYTES);
+
+	printf(":%s %s [%"PRIu64":%"PRIu64"]\n",
+	       chain, policy ?: "-", pkts, bytes);
+}
+
 void save_matches_and_target(struct xtables_rule_match *m,
 			     struct xtables_target *target,
 			     const char *jumpto, uint8_t flags, const void *fw)