[PATCH] libip6t_hbh: Add translation to nft

[FaTe <gokuvsvegita@gmail.com>]

Added translation for hbh module .

Note: Currently, --hbh-opts support dont exist in nftables .

Example :
$ ip6tables-translate -A INPUT -m hbh --hbh-len 40
nft add rule ip6 filter INPUT hbh hdrlength  40 counter

$ sudo ip6tables-translate -A INPUT -m hbh ! --hbh-len 40
nft add rule ip6 filter INPUT hbh hdrlength  != 40 counter

Signed-off-by: Piyush Pangtey <gokuvsvegita@gmail.com>
---
 extensions/libip6t_hbh.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/extensions/libip6t_hbh.c b/extensions/libip6t_hbh.c
index c0389ed..98dcade 100644
--- a/extensions/libip6t_hbh.c
+++ b/extensions/libip6t_hbh.c
@@ -164,6 +164,27 @@ static void hbh_save(const void *ip, const struct xt_entry_match *match)
 	print_options(optinfo->optsnr, (uint16_t *)optinfo->opts);
 }
 
+static int hbh_xlate(const struct xt_entry_match *match, struct xt_xlate *xl,
+		     int numeric)
+{
+	const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data;
+
+	if (optinfo->flags & IP6T_OPTS_LEN) {
+		xt_xlate_add(xl," hbh hdrlength %s %u",
+			    (optinfo->invflags & IP6T_OPTS_INV_LEN) ? " !=" :
+			    "", optinfo->hdrlen);
+	} else {
+		return 0;
+	}
+
+	if (optinfo->flags & IP6T_OPTS_OPTS)
+		return 0;
+
+	xt_xlate_add(xl, " ");
+
+	return 1;
+
+}
 static struct xtables_match hbh_mt6_reg = {
 	.name 		= "hbh",
 	.version	= XTABLES_VERSION,
@@ -175,6 +196,7 @@ static struct xtables_match hbh_mt6_reg = {
 	.save		= hbh_save,
 	.x6_parse	= hbh_parse,
 	.x6_options	= hbh_opts,
+	.xlate 		= hbh_xlate,
 };
 
 void
-- 
1.9.1