Add translation for multiport to nftables, which it's supported natively.
Examples:
$ sudo iptables-translate -t filter -A INPUT -p tcp -m multiport --dports 80,81 -j ACCEPT
nft add rule ip filter INPUT ip protocol tcp tcp dport { 80,81} counter accept
$ sudo iptables-translate -t filter -A INPUT -p tcp -m multiport --dports 80:88 -j ACCEPT
nft add rule ip filter INPUT ip protocol tcp tcp dport 80-88 counter accept
$ sudo iptables-translate -t filter -A INPUT -p tcp -m multiport ! --dports 80:88 -j ACCEPT
nft add rule ip filter INPUT ip protocol tcp tcp dport != 80-88 counter accept
Signed-off-by: Laura Garcia Liebana <nevola@xxxxxxxxx>
---
Changes in v2:
- Add curley brackets to lists and range of ports.
Changes in v3:
- Avoid {} in port ranges
extensions/libxt_multiport.c | 118 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 118 insertions(+)
diff --git a/extensions/libxt_multiport.c b/extensions/libxt_multiport.c
index 03af5a9..869ce37 100644
--- a/extensions/libxt_multiport.c
+++ b/extensions/libxt_multiport.c
@@ -468,6 +468,120 @@ static void multiport_save6_v1(const void *ip_void,
__multiport_save_v1(match, ip->proto);
}
+static int __multiport_xlate(const void *ip, const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ const struct xt_multiport *multiinfo
+ = (const struct xt_multiport *)match->data;
+ unsigned int i;
+
+ switch (multiinfo->flags) {
+ case XT_MULTIPORT_SOURCE:
+ xt_xlate_add(xl, "sport ");
+ break;
+ case XT_MULTIPORT_DESTINATION:
+ xt_xlate_add(xl, "dport ");
+ break;
+ case XT_MULTIPORT_EITHER:
+ return 0;
+ }
+
+ if (multiinfo->count > 1)
+ xt_xlate_add(xl, "{ ");
+
+ for (i = 0; i < multiinfo->count; i++)
+ xt_xlate_add(xl, "%s%u", i ? "," : "", multiinfo->ports[i]);
+
+ if (multiinfo->count > 1)
+ xt_xlate_add(xl, "}");
+
+ xt_xlate_add(xl, " ");
+
+ return 1;
+}
+
+static int multiport_xlate(const void *ip, const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ uint8_t proto = ((const struct ipt_ip *)ip)->proto;
+
+ xt_xlate_add(xl, "%s ", proto_to_name(proto));
+ return __multiport_xlate(ip, match, xl, numeric);
+}
+
+static int multiport_xlate6(const void *ip, const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ uint8_t proto = ((const struct ip6t_ip6 *)ip)->proto;
+
+ xt_xlate_add(xl, "%s ", proto_to_name(proto));
+ return __multiport_xlate(ip, match, xl, numeric);
+}
+
+static int __multiport_xlate_v1(const void *ip,
+ const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ const struct xt_multiport_v1 *multiinfo
+ = (const struct xt_multiport_v1 *)match->data;
+ unsigned int i;
+
+ switch (multiinfo->flags) {
+ case XT_MULTIPORT_SOURCE:
+ xt_xlate_add(xl, "sport ");
+ break;
+ case XT_MULTIPORT_DESTINATION:
+ xt_xlate_add(xl, "dport ");
+ break;
+ case XT_MULTIPORT_EITHER:
+ return 0;
+ }
+
+ if (multiinfo->invert)
+ xt_xlate_add(xl, "!= ");
+
+ if (multiinfo->count > 2 ||
+ (multiinfo->count > 1 && !multiinfo->pflags[0])) {
+ xt_xlate_add(xl, "{ ");
+ if (multiinfo->invert)
+ return 0;
+ }
+
+ for (i = 0; i < multiinfo->count; i++) {
+ xt_xlate_add(xl, "%s%u", i ? "," : "", multiinfo->ports[i]);
+ if (multiinfo->pflags[i])
+ xt_xlate_add(xl, "-%u", multiinfo->ports[++i]);
+ }
+
+ if (multiinfo->count > 2 ||
+ (multiinfo->count > 1 && !multiinfo->pflags[0]))
+ xt_xlate_add(xl, "}");
+
+ xt_xlate_add(xl, " ");
+
+ return 1;
+}
+
+static int multiport_xlate_v1(const void *ip,
+ const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ uint8_t proto = ((const struct ipt_ip *)ip)->proto;
+
+ xt_xlate_add(xl, "%s ", proto_to_name(proto));
+ return __multiport_xlate_v1(ip, match, xl, numeric);
+}
+
+static int multiport_xlate6_v1(const void *ip,
+ const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ uint8_t proto = ((const struct ip6t_ip6 *)ip)->proto;
+
+ xt_xlate_add(xl, "%s ", proto_to_name(proto));
+ return __multiport_xlate_v1(ip, match, xl, numeric);
+}
+
static struct xtables_match multiport_mt_reg[] = {
{
.family = NFPROTO_IPV4,
@@ -482,6 +596,7 @@ static struct xtables_match multiport_mt_reg[] = {
.print = multiport_print,
.save = multiport_save,
.x6_options = multiport_opts,
+ .xlate = multiport_xlate,
},
{
.family = NFPROTO_IPV6,
@@ -496,6 +611,7 @@ static struct xtables_match multiport_mt_reg[] = {
.print = multiport_print6,
.save = multiport_save6,
.x6_options = multiport_opts,
+ .xlate = multiport_xlate6,
},
{
.family = NFPROTO_IPV4,
@@ -510,6 +626,7 @@ static struct xtables_match multiport_mt_reg[] = {
.print = multiport_print_v1,
.save = multiport_save_v1,
.x6_options = multiport_opts,
+ .xlate = multiport_xlate_v1,
},
{
.family = NFPROTO_IPV6,
@@ -524,6 +641,7 @@ static struct xtables_match multiport_mt_reg[] = {
.print = multiport_print6_v1,
.save = multiport_save6_v1,
.x6_options = multiport_opts,
+ .xlate = multiport_xlate6_v1,
},
};
--
2.7.0
--
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