From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shivani Bhardwaj Subject: [PATCH v2] extensions: libipt_MASQUERADE: Add translation to nft Date: Wed, 2 Mar 2016 15:27:49 +0530 Message-ID: <20160302095749.GA6686@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]:33875 "EHLO mail-pa0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751535AbcCBJ54 (ORCPT ); Wed, 2 Mar 2016 04:57:56 -0500 Received: by mail-pa0-f65.google.com with SMTP id hj7so647095pac.1 for ; Wed, 02 Mar 2016 01:57:56 -0800 (PST) Received: from gmail.com ([223.176.178.213]) by smtp.gmail.com with ESMTPSA id h2sm18180253pfd.91.2016.03.02.01.57.53 for (version=TLS1_2 cipher=AES128-SHA bits=128/128); Wed, 02 Mar 2016 01:57:54 -0800 (PST) Content-Disposition: inline Sender: netfilter-devel-owner@vger.kernel.org List-ID: Add translation for masquerade to nftables. Examples: $ sudo iptables-translate -t nat -A POSTROUTING -j MASQUERADE nft add rule ip nat POSTROUTING counter masquerade $ sudo iptables-translate -t nat -A POSTROUTING -p tcp -j MASQUERADE --to-ports 10 nft add rule ip nat POSTROUTING ip protocol tcp counter masquerade to :10 $ sudo iptables-translate -t nat -A POSTROUTING -p tcp -j MASQUERADE --to-ports 10-20 --random nft add rule ip nat POSTROUTING ip protocol tcp counter masquerade to :10-20 random Signed-off-by: Shivani Bhardwaj --- Changes in v2: Add code for masquerade port range selection extensions/libipt_MASQUERADE.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/extensions/libipt_MASQUERADE.c b/extensions/libipt_MASQUERADE.c index ea07445..d1393c1 100644 --- a/extensions/libipt_MASQUERADE.c +++ b/extensions/libipt_MASQUERADE.c @@ -134,6 +134,29 @@ 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_ipv4_multi_range_compat *mr = + (const void *)target->data; + const struct nf_nat_ipv4_range *r = &mr->range[0]; + + xt_xlate_add(xl, "masquerade"); + + if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { + xt_xlate_add(xl, " to :%hu", ntohs(r->min.tcp.port)); + if (r->max.tcp.port != r->min.tcp.port) + xt_xlate_add(xl, "-%hu", ntohs(r->max.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, @@ -146,6 +169,7 @@ 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