From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shivani Bhardwaj Subject: [PATCH v2] extensions: libip6t_MASQUERADE: Add translation to nft Date: Wed, 2 Mar 2016 15:54:01 +0530 Message-ID: <20160302102401.GA9921@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: netfilter-devel@vger.kernel.org Return-path: Received: from mail-pa0-f65.google.com ([209.85.220.65]:33704 "EHLO mail-pa0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750843AbcCBKYJ (ORCPT ); Wed, 2 Mar 2016 05:24:09 -0500 Received: by mail-pa0-f65.google.com with SMTP id y7so12018715paa.0 for ; Wed, 02 Mar 2016 02:24:09 -0800 (PST) Received: from gmail.com ([223.176.178.213]) by smtp.gmail.com with ESMTPSA id kw10sm51963550pab.0.2016.03.02.02.24.06 for (version=TLS1_2 cipher=AES128-SHA bits=128/128); Wed, 02 Mar 2016 02:24:07 -0800 (PST) Content-Disposition: inline Sender: netfilter-devel-owner@vger.kernel.org List-ID: Add translation for masquerade to nftables. Examples: $ sudo ip6tables-translate -t nat -A POSTROUTING -j MASQUERADE nft add rule ip6 nat POSTROUTING counter masquerade $ sudo ip6tables-translate -t nat -A POSTROUTING -p tcp -j MASQUERADE --to-ports 10 nft add rule ip6 nat POSTROUTING ip6 nexthdr tcp counter masquerade to :10 $ sudo ip6tables-translate -t nat -A POSTROUTING -p tcp -j MASQUERADE --to-ports 10-20 --random nft add rule ip6 nat POSTROUTING ip6 nexthdr tcp counter masquerade to :10-20 random Signed-off-by: Shivani Bhardwaj --- Changes in v2: Add code for masquerading port range selection extensions/libip6t_MASQUERADE.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/extensions/libip6t_MASQUERADE.c b/extensions/libip6t_MASQUERADE.c index eb9213e..5a309ac 100644 --- a/extensions/libip6t_MASQUERADE.c +++ b/extensions/libip6t_MASQUERADE.c @@ -131,6 +131,27 @@ MASQUERADE_save(const void *ip, const struct xt_entry_target *target) printf(" --random"); } +static int +MASQUERADE_xlate(const struct xt_entry_target *target, + struct xt_xlate *xl, int numeric) +{ + const struct nf_nat_range *r = (const void *)target->data; + + xt_xlate_add(xl, "masquerade"); + + if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { + xt_xlate_add(xl, " to :%hu", ntohs(r->min_proto.tcp.port)); + if (r->max_proto.tcp.port != r->min_proto.tcp.port) + xt_xlate_add(xl, "-%hu", ntohs(r->max_proto.tcp.port)); + } + + xt_xlate_add(xl, " "); + if (r->flags & NF_NAT_RANGE_PROTO_RANDOM) + xt_xlate_add(xl, "random "); + + return 1; +} + static struct xtables_target masquerade_tg_reg = { .name = "MASQUERADE", .version = XTABLES_VERSION, @@ -142,6 +163,7 @@ static struct xtables_target masquerade_tg_reg = { .print = MASQUERADE_print, .save = MASQUERADE_save, .x6_options = MASQUERADE_opts, + .xlate = MASQUERADE_xlate, }; void _init(void) -- 1.9.1