Add translation for packet type to nftables.
Examples:
$ sudo iptables-translate -A INPUT -m pkttype --pkt-type broadcast -j DROP
nft add rule ip filter INPUT pkttype broadcast counter drop
$ sudo iptables-translate -A INPUT -m pkttype ! --pkt-type unicast -j DROP
nft add rule ip filter INPUT pkttype != unicast counter drop
Signed-off-by: Shivani Bhardwaj <shivanib134@xxxxxxxxx>
---
Changes in v2:
Add new structure to remove unneeded parameters
extensions/libxt_pkttype.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/extensions/libxt_pkttype.c b/extensions/libxt_pkttype.c
index 1ed3b44..9dff248 100644
--- a/extensions/libxt_pkttype.c
+++ b/extensions/libxt_pkttype.c
@@ -21,6 +21,11 @@ struct pkttypes {
const char *help;
};
+struct pkttypes_xlate {
+ const char *name;
+ unsigned char pkttype;
+};
+
static const struct pkttypes supported_types[] = {
{"unicast", PACKET_HOST, 1, "to us"},
{"broadcast", PACKET_BROADCAST, 1, "to all"},
@@ -115,6 +120,37 @@ static void pkttype_save(const void *ip, const struct xt_entry_match *match)
print_pkttype(info);
}
+static const struct pkttypes_xlate supported_types_xlate[] = {
+ {"unicast", PACKET_HOST},
+ {"broadcast", PACKET_BROADCAST},
+ {"multicast", PACKET_MULTICAST},
+};
+
+static void print_pkttype_xlate(const struct xt_pkttype_info *info,
+ struct xt_buf *buf)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(supported_types_xlate); ++i)
+ if (supported_types_xlate[i].pkttype == info->pkttype) {
+ xt_buf_add(buf, "%s ", supported_types_xlate[i].name);
+ return;
+ }
+
+ xt_buf_add(buf, "%d", info->pkttype);
+}
+
+static int pkttype_xlate(const struct xt_entry_match *match,
+ struct xt_buf *buf, int numeric)
+{
+ const struct xt_pkttype_info *info = (const void *)match->data;
+
+ xt_buf_add(buf, "pkttype%s ", info->invert ? " !=" : "");
+ print_pkttype_xlate(info, buf);
+
+ return 1;
+}
+
static struct xtables_match pkttype_match = {
.family = NFPROTO_UNSPEC,
.name = "pkttype",
@@ -126,6 +162,7 @@ static struct xtables_match pkttype_match = {
.save = pkttype_save,
.x6_parse = pkttype_parse,
.x6_options = pkttype_opts,
+ .xlate = pkttype_xlate,
};
void _init(void)
--
1.9.1
--
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