From 95a7a9df945790f92237e4d2e91f3d372d6a2ad5 Mon Sep 17 00:00:00 2001 From: Shivani Bhardwaj Date: Tue, 29 Dec 2015 23:54:25 +0530 Subject: extensions: libxt_length: Add translation to nft 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 Signed-off-by: Pablo Neira Ayuso --- extensions/libxt_length.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/extensions/libxt_length.c b/extensions/libxt_length.c index 6ea76465..96dab0cf 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) -- cgit v1.2.3