Add translation for module length to nftables.
Examples:
$ sudo iptables-translate -A INPUT -p icmp -m length --length 86:0xffff -j DROP
nft add rule ip filter INPUT ip protocol icmp meta length 86-65535 counter drop
$ sudo iptables-translate -A INPUT -p udp -m length --length :400
nft add rule ip filter INPUT ip protocol udp meta length 0-400 counter
$ sudo iptables-translate -A INPUT -p udp -m length --length 40
nft add rule ip filter INPUT ip protocol udp meta length 40 counter
$ sudo iptables-translate -A INPUT -p udp -m length ! --length 40
nft add rule ip filter INPUT ip protocol udp meta length != 40 counter
Signed-off-by: Shivani Bhardwaj <shivanib134@xxxxxxxxx>
---
Changes in v2:
Remove unneeded space character
extensions/libxt_length.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/extensions/libxt_length.c b/extensions/libxt_length.c
index 6ea7646..96dab0c 100644
--- a/extensions/libxt_length.c
+++ b/extensions/libxt_length.c
@@ -56,6 +56,21 @@ static void length_save(const void *ip, const struct xt_entry_match *match)
printf("%u:%u", info->min, info->max);
}
+static int length_xlate(const struct xt_entry_match *match,
+ struct xt_buf *buf, int numeric)
+{
+ const struct xt_length_info *info = (void *)match->data;
+
+ xt_buf_add(buf, "meta length %s", info->invert ? "!= " : "");
+ if (info->min == info->max)
+ xt_buf_add(buf, "%u ", info->min);
+ else
+ xt_buf_add(buf, "%u-%u ", info->min, info->max);
+
+ return 1;
+}
+
+
static struct xtables_match length_match = {
.family = NFPROTO_UNSPEC,
.name = "length",
@@ -67,6 +82,7 @@ static struct xtables_match length_match = {
.save = length_save,
.x6_parse = length_parse,
.x6_options = length_opts,
+ .xlate = length_xlate,
};
void _init(void)
--
1.9.1
--
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