From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laura Garcia Liebana Subject: [PATCHv6] extensions: libipt_icmp: Add translation to nft Date: Sat, 12 Mar 2016 17:54:34 +0100 Message-ID: <20160312165431.GA12984@sonyv> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: shivanib134@gmail.com, pablo@netfilter.org, outreachy-kernel@googlegroups.com To: netfilter-devel@vger.kernel.org Return-path: Received: from mail-wm0-f41.google.com ([74.125.82.41]:33089 "EHLO mail-wm0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750887AbcCLQyj (ORCPT ); Sat, 12 Mar 2016 11:54:39 -0500 Received: by mail-wm0-f41.google.com with SMTP id l68so53410405wml.0 for ; Sat, 12 Mar 2016 08:54:38 -0800 (PST) Content-Disposition: inline Sender: netfilter-devel-owner@vger.kernel.org List-ID: Add translation for icmp to nftables. Not supported icmp codes in nftables are: network-unreachable, host-unreachable, protocol-unreachable, port-unreachable, fragmentation-needed, source-route-failed, network-unknown, host-unknown, network-prohibited, host-prohibited, TOS-network-unreachable, TOS-host-unreachable, communication-prohibited, host-precedence-violation, precedence-cutoff, network-redirect, host-redirect, TOS-network-redirect, TOS-host-redirect, ttl-zero-during-transit, ttl-zero-during-reassembly, ip-header-bad and required-option-missing. Examples: $ sudo iptables-translate -t filter -A INPUT -m icmp --icmp-type echo-reply -j ACCEPT nft add rule ip filter INPUT icmp type echo-reply counter accept $ sudo iptables-translate -t filter -A INPUT -m icmp --icmp-type 3 -j ACCEPT nft add rule ip filter INPUT icmp type destination-unreachable counter accept $ sudo iptables-translate -t filter -A INPUT -m icmp ! --icmp-type 3 -j ACCEPT nft add rule ip filter INPUT icmp type != destination-unreachable counter accept In the case of '--icmp-type any' there is no type to translate, nft only has to check the icmp header. This is currently not supported in nft. $ sudo iptables-translate -t filter -A INPUT -m icmp --icmp-type any -j ACCEPT nft add rule ip filter INPUT icmp counter accept Signed-off-by: Laura Garcia Liebana --- v2: - Detection of not supported types in nftables, as Shivani suggested. v3: - Fix array iteration protection. v4: - icmp types router-advertisement and router-solicitation already supported in nft. v5: - Update commit message with the correct not supported codes. v6: - No type to translate with 'any'. extensions/libipt_icmp.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/extensions/libipt_icmp.c b/extensions/libipt_icmp.c index 666e7da..2238b19 100644 --- a/extensions/libipt_icmp.c +++ b/extensions/libipt_icmp.c @@ -249,6 +249,46 @@ static void icmp_save(const void *ip, const struct xt_entry_match *match) } } +static unsigned int type_xlate_print(struct xt_xlate *xl, unsigned int icmptype, + unsigned int code_min, + unsigned int code_max) +{ + unsigned int i; + + if (code_min != code_max) { + for (i = 0; i < ARRAY_SIZE(icmp_codes); ++i) + if (icmp_codes[i].type == icmptype && + icmp_codes[i].code_min == code_min && + icmp_codes[i].code_max == code_max) { + xt_xlate_add(xl, icmp_codes[i].name); + return 1; + } + } + + return 0; +} + +static int icmp_xlate(const void *ip, const struct xt_entry_match *match, + struct xt_xlate *xl, int numeric) +{ + const struct ipt_icmp *info = (struct ipt_icmp *)match->data; + + if (info->type == 0xFF) { + xt_xlate_add(xl, "icmp"); + } else { + xt_xlate_add(xl, "icmp type%s ", + (info->invflags & IPT_ICMP_INV) ? " !=" : ""); + + if (!type_xlate_print(xl, info->type, info->code[0], + info->code[1])) + return 0; + } + + xt_xlate_add(xl, " "); + + return 1; +} + static struct xtables_match icmp_mt_reg = { .name = "icmp", .version = XTABLES_VERSION, @@ -261,6 +301,7 @@ static struct xtables_match icmp_mt_reg = { .save = icmp_save, .x6_parse = icmp_parse, .x6_options = icmp_opts, + .xlate = icmp_xlate, }; void _init(void) -- 2.7.0