Add translation for masquerade to nftables.
Examples:
$ sudo iptables-translate -t nat -A POSTROUTING -j MASQUERADE
nft add rule ip nat POSTROUTING counter masquerade
$ sudo iptables-translate -t nat -A POSTROUTING -p tcp -j MASQUERADE --to-ports 10
nft add rule ip nat POSTROUTING ip protocol tcp counter masquerade to :10
$ sudo iptables-translate -t nat -A POSTROUTING -p tcp -j MASQUERADE --to-ports 10-20 --random
nft add rule ip nat POSTROUTING ip protocol tcp counter masquerade to :10-20 random
Signed-off-by: Shivani Bhardwaj <shivanib134@xxxxxxxxx>
---
Changes in v2:
Add code for masquerade port range selection
extensions/libipt_MASQUERADE.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/extensions/libipt_MASQUERADE.c b/extensions/libipt_MASQUERADE.c
index ea07445..d1393c1 100644
--- a/extensions/libipt_MASQUERADE.c
+++ b/extensions/libipt_MASQUERADE.c
@@ -134,6 +134,29 @@ 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_SPECIFIED) {
+ xt_xlate_add(xl, " to :%hu", ntohs(r->min.tcp.port));
+ if (r->max.tcp.port != r->min.tcp.port)
+ xt_xlate_add(xl, "-%hu", ntohs(r->max.tcp.port));
+ }
+
+ xt_xlate_add(xl, " ");
+ 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 +169,7 @@ 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
--
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