[PATCH] extensions: libxt_cpu: Add translation to nft

[Shivani Bhardwaj <shivanib134@gmail.com>]

Add translation for module cpu to nftables.

Examples:

$ sudo iptables-translate -A INPUT -p tcp --dport 80 -m cpu --cpu 0 -j ACCEPT
nft add rule ip filter INPUT tcp dport 80 cpu 0 counter accept

$ sudo iptables-translate -A INPUT -p tcp --dport 80 -m cpu ! --cpu 1 -j ACCEPT
nft add rule ip filter INPUT tcp dport 80 cpu != 1 counter accept

Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com>
---
 extensions/libxt_cpu.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/extensions/libxt_cpu.c b/extensions/libxt_cpu.c
index 404a6a6..74e6077 100644
--- a/extensions/libxt_cpu.c
+++ b/extensions/libxt_cpu.c
@@ -44,9 +44,19 @@ static void cpu_save(const void *ip, const struct xt_entry_match *match)
 	printf("%s --cpu %u", info->invert ? " !" : "", info->cpu);
 }
 
+static int cpu_xlate(const struct xt_entry_match *match,
+		     struct xt_buf *buf, int numeric)
+{
+	const struct xt_cpu_info *info = (void *)match->data;
+
+	xt_buf_add(buf, "cpu%s %u ", info->invert ? " !=" : "", info->cpu);
+
+	return 1;
+}
+
 static struct xtables_match cpu_match = {
 	.family		= NFPROTO_UNSPEC,
- 	.name		= "cpu",
+	.name		= "cpu",
 	.version	= XTABLES_VERSION,
 	.size		= XT_ALIGN(sizeof(struct xt_cpu_info)),
 	.userspacesize	= XT_ALIGN(sizeof(struct xt_cpu_info)),
@@ -55,6 +65,7 @@ static struct xtables_match cpu_match = {
 	.save		= cpu_save,
 	.x6_parse	= cpu_parse,
 	.x6_options	= cpu_opts,
+	.xlate		= cpu_xlate,
 };
 
 void _init(void)
-- 
1.9.1