[PATCH] extensions: libipt_MASQUERADE: Add translation to nft

[Shivani Bhardwaj <shivanib134@gmail.com>]

Add translation for target MASQUERADE to nftables.
Full translation of this target awaits the support for --to-ports option.

Examples:

$ sudo iptables-translate -t nat -A POSTROUTING -o eth0 -j MASQUERADE
nft add rule ip nat POSTROUTING oifname eth0 counter masquerade

$ sudo iptables-translate -t nat -A POSTROUTING -j MASQUERADE --random
nft add rule ip nat POSTROUTING counter masquerade random

Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com>
---
 extensions/libipt_MASQUERADE.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/extensions/libipt_MASQUERADE.c b/extensions/libipt_MASQUERADE.c
index ea07445..1dc8853 100644
--- a/extensions/libipt_MASQUERADE.c
+++ b/extensions/libipt_MASQUERADE.c
@@ -134,6 +134,22 @@ MASQUERADE_save(const void *ip, const struct xt_entry_target *target)
 		printf(" --random");
 }
 
+static int
+MASQUERADE_xlate(const struct xt_entry_target *target,
+		 struct xt_xlate *xl, int numeric)
+{
+	const struct nf_nat_ipv4_multi_range_compat *mr =
+					(const void *)target->data;
+	const struct nf_nat_ipv4_range *r = &mr->range[0];
+
+	xt_xlate_add(xl, "masquerade ");
+
+	if (r->flags & NF_NAT_RANGE_PROTO_RANDOM)
+		xt_xlate_add(xl, "random ");
+
+	return 1;
+}
+
 static struct xtables_target masquerade_tg_reg = {
 	.name		= "MASQUERADE",
 	.version	= XTABLES_VERSION,
@@ -146,6 +162,7 @@ static struct xtables_target masquerade_tg_reg = {
 	.print		= MASQUERADE_print,
 	.save		= MASQUERADE_save,
 	.x6_options	= MASQUERADE_opts,
+	.xlate		= MASQUERADE_xlate,
 };
 
 void _init(void)
-- 
1.9.1