diff options
| author | Shivani Bhardwaj <shivanib134@gmail.com> | 2015-12-29 23:54:25 +0530 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-02-16 19:30:24 +0100 |
| commit | 95a7a9df945790f92237e4d2e91f3d372d6a2ad5 (patch) | |
| tree | 35d4ce594520c576f1ec000f7523c253fa69afeb /extensions | |
| parent | d4721236c2e8808958ada3d7b2548f4c473908a0 (diff) | |
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 <shivanib134@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'extensions')
| -rw-r--r-- | extensions/libxt_length.c | 16 |
1 files changed, 16 insertions, 0 deletions
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) |