From patchwork Mon Aug 9 04:10:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cole Dishington X-Patchwork-Id: 12425377 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99225C4320E for ; Mon, 9 Aug 2021 04:11:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7C56E60EE4 for ; Mon, 9 Aug 2021 04:11:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231667AbhHIELT (ORCPT ); Mon, 9 Aug 2021 00:11:19 -0400 Received: from gate2.alliedtelesis.co.nz ([202.36.163.20]:50739 "EHLO gate2.alliedtelesis.co.nz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230394AbhHIELS (ORCPT ); Mon, 9 Aug 2021 00:11:18 -0400 Received: from svr-chch-seg1.atlnz.lc (mmarshal3.atlnz.lc [10.32.18.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by gate2.alliedtelesis.co.nz (Postfix) with ESMTPS id 520A8891B0; Mon, 9 Aug 2021 16:10:56 +1200 (NZST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alliedtelesis.co.nz; s=mail181024; t=1628482256; bh=vVa4Y+0GqMCnCeJxuGVwfHhQR4hYHlTSwCLmmjQY04I=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Q+5wfASJucgw2e+OemCxQb8xWly9y4VclJ8jZ8Z5ePDZ3AzrIVLjmO6FzSuhW6fcR sjtIEvZGceYp81PVuZ7NnEdzioOgTecCALuCBzFN87Q+/a3UXOnT9YdDYIXvyAI1bQ ukVTihKkSjksRbLQgRrc3fRlc1rIBLqkp2JQZjWcFhPg1xc4sFYzNifcLlmvUbmIFc vOAwvyVtR5UoA2pSiYB9whtEvWv9LBvQ+1ZRxRCiAqe3y+PtZzahjyvqFinxgTtf/L gi8WlgWJ2qEipqgIwpU5WEq6aYYPFuNa476lln+i5nAFVXkEW6i7QAGVStryHBRfsr AAPuOq94qyFIA== Received: from pat.atlnz.lc (Not Verified[10.32.16.33]) by svr-chch-seg1.atlnz.lc with Trustwave SEG (v8,2,6,11305) id ; Mon, 09 Aug 2021 16:10:56 +1200 Received: from coled-dl.ws.atlnz.lc (coled-dl.ws.atlnz.lc [10.33.25.26]) by pat.atlnz.lc (Postfix) with ESMTP id 1F1A613EDC1; Mon, 9 Aug 2021 16:10:56 +1200 (NZST) Received: by coled-dl.ws.atlnz.lc (Postfix, from userid 1801) id 1B56A2428A0; Mon, 9 Aug 2021 16:10:56 +1200 (NZST) From: Cole Dishington To: pablo@netfilter.org Cc: kadlec@netfilter.org, fw@strlen.de, davem@davemloft.net, kuba@kernel.org, shuah@kernel.org, Cole.Dishington@alliedtelesis.co.nz, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Anthony Lineham , Scott Parlane , Blair Steven Subject: [PATCH net-next 1/3] net: netfilter: Add RFC-7597 Section 5.1 PSID support xtables API Date: Mon, 9 Aug 2021 16:10:35 +1200 Message-Id: <20210809041037.29969-2-Cole.Dishington@alliedtelesis.co.nz> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210809041037.29969-1-Cole.Dishington@alliedtelesis.co.nz> References: <20210726143729.GN9904@breakpoint.cc> <20210809041037.29969-1-Cole.Dishington@alliedtelesis.co.nz> MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.3 cv=dvql9Go4 c=1 sm=1 tr=0 a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=MhDmnRu9jo8A:10 a=3HDBlxybAAAA:8 a=mhPBjSskWxd-kjGSbREA:9 a=laEoCiVfU_Unz3mSdgXN:22 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add support for revision 2 of xtables masquerade extension. Co-developed-by: Anthony Lineham Signed-off-by: Anthony Lineham Co-developed-by: Scott Parlane Signed-off-by: Scott Parlane Signed-off-by: Blair Steven Signed-off-by: Cole Dishington --- Notes: No changes. include/uapi/linux/netfilter/nf_nat.h | 3 +- net/netfilter/xt_MASQUERADE.c | 44 ++++++++++++++++++++++++--- 2 files changed, 41 insertions(+), 6 deletions(-) diff --git a/include/uapi/linux/netfilter/nf_nat.h b/include/uapi/linux/netfilter/nf_nat.h index a64586e77b24..660e53ffdb57 100644 --- a/include/uapi/linux/netfilter/nf_nat.h +++ b/include/uapi/linux/netfilter/nf_nat.h @@ -12,6 +12,7 @@ #define NF_NAT_RANGE_PROTO_RANDOM_FULLY (1 << 4) #define NF_NAT_RANGE_PROTO_OFFSET (1 << 5) #define NF_NAT_RANGE_NETMAP (1 << 6) +#define NF_NAT_RANGE_PSID (1 << 7) #define NF_NAT_RANGE_PROTO_RANDOM_ALL \ (NF_NAT_RANGE_PROTO_RANDOM | NF_NAT_RANGE_PROTO_RANDOM_FULLY) @@ -20,7 +21,7 @@ (NF_NAT_RANGE_MAP_IPS | NF_NAT_RANGE_PROTO_SPECIFIED | \ NF_NAT_RANGE_PROTO_RANDOM | NF_NAT_RANGE_PERSISTENT | \ NF_NAT_RANGE_PROTO_RANDOM_FULLY | NF_NAT_RANGE_PROTO_OFFSET | \ - NF_NAT_RANGE_NETMAP) + NF_NAT_RANGE_NETMAP | NF_NAT_RANGE_PSID) struct nf_nat_ipv4_range { unsigned int flags; diff --git a/net/netfilter/xt_MASQUERADE.c b/net/netfilter/xt_MASQUERADE.c index eae05c178336..dc6870ca2b71 100644 --- a/net/netfilter/xt_MASQUERADE.c +++ b/net/netfilter/xt_MASQUERADE.c @@ -16,7 +16,7 @@ MODULE_AUTHOR("Netfilter Core Team "); MODULE_DESCRIPTION("Xtables: automatic-address SNAT"); /* FIXME: Multiple targets. --RR */ -static int masquerade_tg_check(const struct xt_tgchk_param *par) +static int masquerade_tg_check_v0(const struct xt_tgchk_param *par) { const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; @@ -31,8 +31,19 @@ static int masquerade_tg_check(const struct xt_tgchk_param *par) return nf_ct_netns_get(par->net, par->family); } +static int masquerade_tg_check_v1(const struct xt_tgchk_param *par) +{ + const struct nf_nat_range2 *range = par->targinfo; + + if (range->flags & NF_NAT_RANGE_MAP_IPS) { + pr_debug("bad MAP_IPS.\n"); + return -EINVAL; + } + return nf_ct_netns_get(par->net, par->family); +} + static unsigned int -masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par) +masquerade_tg_v0(struct sk_buff *skb, const struct xt_action_param *par) { struct nf_nat_range2 range; const struct nf_nat_ipv4_multi_range_compat *mr; @@ -46,6 +57,15 @@ masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par) xt_out(par)); } +static unsigned int +masquerade_tg_v1(struct sk_buff *skb, const struct xt_action_param *par) +{ + const struct nf_nat_range2 *range = par->targinfo; + + return nf_nat_masquerade_ipv4(skb, xt_hooknum(par), range, + xt_out(par)); +} + static void masquerade_tg_destroy(const struct xt_tgdtor_param *par) { nf_ct_netns_put(par->net, par->family); @@ -73,6 +93,7 @@ static struct xt_target masquerade_tg_reg[] __read_mostly = { { #if IS_ENABLED(CONFIG_IPV6) .name = "MASQUERADE", + .revision = 0, .family = NFPROTO_IPV6, .target = masquerade_tg6, .targetsize = sizeof(struct nf_nat_range), @@ -84,15 +105,28 @@ static struct xt_target masquerade_tg_reg[] __read_mostly = { }, { #endif .name = "MASQUERADE", + .revision = 0, .family = NFPROTO_IPV4, - .target = masquerade_tg, + .target = masquerade_tg_v0, .targetsize = sizeof(struct nf_nat_ipv4_multi_range_compat), .table = "nat", .hooks = 1 << NF_INET_POST_ROUTING, - .checkentry = masquerade_tg_check, + .checkentry = masquerade_tg_check_v0, .destroy = masquerade_tg_destroy, .me = THIS_MODULE, - } + }, + { + .name = "MASQUERADE", + .revision = 1, + .family = NFPROTO_IPV4, + .target = masquerade_tg_v1, + .targetsize = sizeof(struct nf_nat_range2), + .table = "nat", + .hooks = 1 << NF_INET_POST_ROUTING, + .checkentry = masquerade_tg_check_v1, + .destroy = masquerade_tg_destroy, + .me = THIS_MODULE, + }, }; static int __init masquerade_tg_init(void) From patchwork Mon Aug 9 04:10:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cole Dishington X-Patchwork-Id: 12425379 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA73CC4320E for ; Mon, 9 Aug 2021 04:11:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AFEE46101C for ; Mon, 9 Aug 2021 04:11:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232782AbhHIEL0 (ORCPT ); Mon, 9 Aug 2021 00:11:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45580 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231713AbhHIELY (ORCPT ); Mon, 9 Aug 2021 00:11:24 -0400 Received: from gate2.alliedtelesis.co.nz (gate2.alliedtelesis.co.nz [IPv6:2001:df5:b000:5::4]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2899C06175F for ; Sun, 8 Aug 2021 21:11:04 -0700 (PDT) Received: from svr-chch-seg1.atlnz.lc (mmarshal3.atlnz.lc [10.32.18.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by gate2.alliedtelesis.co.nz (Postfix) with ESMTPS id 57E22891B2; Mon, 9 Aug 2021 16:11:03 +1200 (NZST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alliedtelesis.co.nz; s=mail181024; t=1628482263; bh=YS7w3RbW7dwCd1MQH5g1Z9+eRWSd7gg2Lg0p8xCQqWU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=sc3r1mlCr9rqIWOGpwHwaScDmO0UpEhyxGmUjzQIZrVi2rM8j4tFg7lc8ZOkiQWmo BmQo0pJmNxy/ZFcLlpiWthGzYMZyraArVS1a5z+aiEbt/UvTMfnHgL8r4+xYdgUnTW k8bu45VcvUtn9E+V28Uee0WdVkouxqMPhpQ8XmiASz29iyykYVr6vvymIZxEtxZYHj w4IaImbItjt7QaRv1SQrIew8yu83Elj0YGYq0ByFkpIGUrS+zEYKQfK6asHCQZ5uw/ YrK/wC7Fcf1mooTaWI+2op6jEQ8ST5i/t+sMReDi6MogC3AeuuCZ215dHBzeSRDuWt vWy8NEz/S6sgA== Received: from pat.atlnz.lc (Not Verified[10.32.16.33]) by svr-chch-seg1.atlnz.lc with Trustwave SEG (v8,2,6,11305) id ; Mon, 09 Aug 2021 16:11:00 +1200 Received: from coled-dl.ws.atlnz.lc (coled-dl.ws.atlnz.lc [10.33.25.26]) by pat.atlnz.lc (Postfix) with ESMTP id 8843B13EDC1; Mon, 9 Aug 2021 16:11:00 +1200 (NZST) Received: by coled-dl.ws.atlnz.lc (Postfix, from userid 1801) id 847012428A0; Mon, 9 Aug 2021 16:11:00 +1200 (NZST) From: Cole Dishington To: pablo@netfilter.org Cc: kadlec@netfilter.org, fw@strlen.de, davem@davemloft.net, kuba@kernel.org, shuah@kernel.org, Cole.Dishington@alliedtelesis.co.nz, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Anthony Lineham , Scott Parlane , Blair Steven Subject: [PATCH net-next 2/3] net: netfilter: Add RFC-7597 Section 5.1 PSID support Date: Mon, 9 Aug 2021 16:10:36 +1200 Message-Id: <20210809041037.29969-3-Cole.Dishington@alliedtelesis.co.nz> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210809041037.29969-1-Cole.Dishington@alliedtelesis.co.nz> References: <20210726143729.GN9904@breakpoint.cc> <20210809041037.29969-1-Cole.Dishington@alliedtelesis.co.nz> MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.3 cv=dvql9Go4 c=1 sm=1 tr=0 a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=MhDmnRu9jo8A:10 a=xOT0nC9th1TpZTiSAT0A:9 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Adds support for masquerading into a smaller subset of ports - defined by the PSID values from RFC-7597 Section 5.1. This is part of the support for MAP-E and Lightweight 4over6, which allows multiple devices to share an IPv4 address by splitting the L4 port / id into ranges. Co-developed-by: Anthony Lineham Signed-off-by: Anthony Lineham Co-developed-by: Scott Parlane Signed-off-by: Scott Parlane Signed-off-by: Blair Steven Signed-off-by: Cole Dishington Reviewed-by: Florian Westphal --- Notes: Changes: - Added Reviewed-by: Florian Westphal . net/netfilter/nf_nat_core.c | 39 +++++++++++++++++++++++++++---- net/netfilter/nf_nat_masquerade.c | 27 +++++++++++++++++++-- 2 files changed, 60 insertions(+), 6 deletions(-) diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c index 7de595ead06a..f07a3473aab5 100644 --- a/net/netfilter/nf_nat_core.c +++ b/net/netfilter/nf_nat_core.c @@ -195,13 +195,36 @@ static bool nf_nat_inet_in_range(const struct nf_conntrack_tuple *t, static bool l4proto_in_range(const struct nf_conntrack_tuple *tuple, enum nf_nat_manip_type maniptype, const union nf_conntrack_man_proto *min, - const union nf_conntrack_man_proto *max) + const union nf_conntrack_man_proto *max, + const union nf_conntrack_man_proto *base, + bool is_psid) { __be16 port; + u16 psid, psid_mask, offset_mask; + + /* In this case we are in PSID mode, avoid checking all ranges by computing bitmasks */ + if (is_psid) { + u32 power_j = ntohs(max->all) - ntohs(min->all) + 1; + u32 offset = ntohs(base->all); + u16 power_a; + + if (offset == 0) + offset = 1 << 16; + + power_a = (1 << 16) / offset; + offset_mask = (power_a - 1) * offset; + psid_mask = ((offset / power_j) << 1) - 1; + psid = ntohs(min->all) & psid_mask; + } switch (tuple->dst.protonum) { case IPPROTO_ICMP: case IPPROTO_ICMPV6: + if (is_psid) { + return (offset_mask == 0 || + (ntohs(tuple->src.u.icmp.id) & offset_mask) != 0) && + ((ntohs(tuple->src.u.icmp.id) & psid_mask) == psid); + } return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) && ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id); case IPPROTO_GRE: /* all fall though */ @@ -215,6 +238,10 @@ static bool l4proto_in_range(const struct nf_conntrack_tuple *tuple, else port = tuple->dst.u.all; + if (is_psid) { + return (offset_mask == 0 || (ntohs(port) & offset_mask) != 0) && + ((ntohs(port) & psid_mask) == psid); + } return ntohs(port) >= ntohs(min->all) && ntohs(port) <= ntohs(max->all); default: @@ -239,7 +266,8 @@ static int in_range(const struct nf_conntrack_tuple *tuple, return 1; return l4proto_in_range(tuple, NF_NAT_MANIP_SRC, - &range->min_proto, &range->max_proto); + &range->min_proto, &range->max_proto, &range->base_proto, + range->flags & NF_NAT_RANGE_PSID); } static inline int @@ -532,8 +560,11 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple, if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { if (!(range->flags & NF_NAT_RANGE_PROTO_OFFSET) && l4proto_in_range(tuple, maniptype, - &range->min_proto, - &range->max_proto) && + &range->min_proto, + &range->max_proto, + &range->base_proto, + range->flags & + NF_NAT_RANGE_PSID) && (range->min_proto.all == range->max_proto.all || !nf_nat_used_tuple(tuple, ct))) return; diff --git a/net/netfilter/nf_nat_masquerade.c b/net/netfilter/nf_nat_masquerade.c index 8e8a65d46345..19a4754cda76 100644 --- a/net/netfilter/nf_nat_masquerade.c +++ b/net/netfilter/nf_nat_masquerade.c @@ -55,8 +55,31 @@ nf_nat_masquerade_ipv4(struct sk_buff *skb, unsigned int hooknum, newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS; newrange.min_addr.ip = newsrc; newrange.max_addr.ip = newsrc; - newrange.min_proto = range->min_proto; - newrange.max_proto = range->max_proto; + + if (range->flags & NF_NAT_RANGE_PSID) { + u16 base = ntohs(range->base_proto.all); + u16 min = ntohs(range->min_proto.all); + u16 off = 0; + + /* xtables should stop base > 2^15 by enforcement of + * 0 <= offset_len < 16 argument, with offset_len=0 + * as a special case inwhich base=0. + */ + if (WARN_ON_ONCE(base > (1 << 15))) + return NF_DROP; + + /* If offset=0, port range is in one contiguous block */ + if (base) + off = prandom_u32_max(((1 << 16) / base) - 1); + + newrange.min_proto.all = htons(min + base * off); + newrange.max_proto.all = htons(ntohs(newrange.min_proto.all) + ntohs(range->max_proto.all) - min); + newrange.base_proto = range->base_proto; + newrange.flags = newrange.flags | NF_NAT_RANGE_PROTO_SPECIFIED; + } else { + newrange.min_proto = range->min_proto; + newrange.max_proto = range->max_proto; + } /* Hand modified range to generic setup. */ return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_SRC); From patchwork Mon Aug 9 04:10:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cole Dishington X-Patchwork-Id: 12425381 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA26DC4338F for ; Mon, 9 Aug 2021 04:11:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C146560184 for ; Mon, 9 Aug 2021 04:11:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231713AbhHIEL0 (ORCPT ); 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Mon, 09 Aug 2021 16:11:01 +1200 Received: from coled-dl.ws.atlnz.lc (coled-dl.ws.atlnz.lc [10.33.25.26]) by pat.atlnz.lc (Postfix) with ESMTP id CAE4413EDC1; Mon, 9 Aug 2021 16:11:01 +1200 (NZST) Received: by coled-dl.ws.atlnz.lc (Postfix, from userid 1801) id C72FF2428A0; Mon, 9 Aug 2021 16:11:01 +1200 (NZST) From: Cole Dishington To: pablo@netfilter.org Cc: kadlec@netfilter.org, fw@strlen.de, davem@davemloft.net, kuba@kernel.org, shuah@kernel.org, Cole.Dishington@alliedtelesis.co.nz, linux-kernel@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH net-next 3/3] selftests: netfilter: Add RFC-7597 Section 5.1 PSID selftests Date: Mon, 9 Aug 2021 16:10:37 +1200 Message-Id: <20210809041037.29969-4-Cole.Dishington@alliedtelesis.co.nz> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210809041037.29969-1-Cole.Dishington@alliedtelesis.co.nz> References: <20210726143729.GN9904@breakpoint.cc> <20210809041037.29969-1-Cole.Dishington@alliedtelesis.co.nz> MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.3 cv=dvql9Go4 c=1 sm=1 tr=0 a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=MhDmnRu9jo8A:10 a=sF_rvDO487Xu6NHlfHgA:9 a=wOcukherponeolA-:21 a=uWybusRNZRjIeY3Y:21 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add selftests for masquerading into a smaller subset of ports defined by PSID. Signed-off-by: Cole Dishington --- Notes: No changes. .../netfilter/nat_masquerade_psid.sh | 182 ++++++++++++++++++ 1 file changed, 182 insertions(+) create mode 100644 tools/testing/selftests/netfilter/nat_masquerade_psid.sh diff --git a/tools/testing/selftests/netfilter/nat_masquerade_psid.sh b/tools/testing/selftests/netfilter/nat_masquerade_psid.sh new file mode 100644 index 000000000000..56c1b509caf6 --- /dev/null +++ b/tools/testing/selftests/netfilter/nat_masquerade_psid.sh @@ -0,0 +1,182 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# <:copyright-gpl +# Copyright (C) 2021 Allied Telesis Labs NZ +# +# check that NAT can masquerade using PSID defined ranges. +# +# Setup is: +# +# nsclient1(veth0) -> (veth1)nsrouter(veth2) -> (veth0)nsclient2 +# Setup a nat masquerade rule with psid defined ranges. +# + +# Kselftest framework requirement - SKIP code is 4. +ksft_skip=4 +ret=0 +ns_all="nsclient1 nsrouter nsclient2" + +readonly infile="$(mktemp)" +readonly outfile="$(mktemp)" +readonly datalen=32 +readonly server_port=8080 + +conntrack -V > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without conntrack tool" + exit $ksft_skip +fi + +iptables --version > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without iptables tool" + exit $ksft_skip +fi + +ip -Version > /dev/null 2>&1 +if [ $? -ne 0 ];then + echo "SKIP: Could not run test without ip tool" + exit $ksft_skip +fi + +ipv4() { + echo -n 192.168.$1.$2 +} + +cleanup() { + for n in $ns_all; do ip netns del $n;done + + if [ -f "${outfile}" ]; then + rm "$outfile" + fi + if [ -f "${infile}" ]; then + rm "$infile" + fi +} + +server_listen() { + ip netns exec nsclient2 nc -l -p "$server_port" > "$outfile" & + server_pid=$! + sleep 0.2 +} + +client_connect() { + ip netns exec nsclient1 timeout 2 nc -w 1 -p "$port" $(ipv4 2 2) "$server_port" < $infile +} + +verify_data() { + local _ret=0 + wait "$server_pid" + cmp "$infile" "$outfile" 2>/dev/null + _ret=$? + rm "$outfile" + return $_ret +} + +test_service() { + server_listen + client_connect + verify_data +} + +check_connection() { + local _ret=0 + entry=$(ip netns exec nsrouter conntrack -p tcp --sport $port -L 2>&1) + entry=${entry##*sport=8080 dport=} + entry=${entry%% *} + + if [[ "x$(( ($entry & $psid_mask) / $two_power_j ))" != "x$psid" ]]; then + _ret=1 + echo "Failed psid mask check for $offset_len:$psid:$psid_length with port $entry" + fi + + if [[ "x$_ret" = "x0" ]] && + [[ "x$offset_mask" != "x0" -a "x$(( ($entry & $offset_mask) ))" == "x0" ]]; then + _ret=1 + echo "Failed offset mask check for $offset_len:$psid:$psid_length with port $entry" + fi + return $_ret +} + +run_test() { + ip netns exec nsrouter iptables -A FORWARD -i veth1 -j ACCEPT + ip netns exec nsrouter iptables -P FORWARD DROP + ip netns exec nsrouter iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT + ip netns exec nsrouter iptables -t nat --new psid + ip netns exec nsrouter iptables -t nat --insert psid -j MASQUERADE \ + --psid $offset_len:$psid:$psid_length + ip netns exec nsrouter iptables -t nat -I POSTROUTING -o veth2 -j psid + + # calculate psid mask + offset=$(( 1 << (16 - $offset_len) )) + two_power_j=$(( $offset / (1 << $psid_length) )) + offset_mask=$(( ( (1 << $offset_len) - 1 ) << (16 - $offset_len) )) + psid_mask=$(( ( (1 << $psid_length) - 1) * $two_power_j )) + + # Create file + dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 >/dev/null 2>&1 + + # Test multiple ports + for p in 1 2 3 4 5; do + port=1080$p + + test_service + if [ $? -ne 0 ]; then + ret=1 + break + fi + + check_connection + if [ $? -ne 0 ]; then + ret=1 + break + fi + done + + # tidy up test rules + ip netns exec nsrouter iptables -F + ip netns exec nsrouter iptables -t nat -F + ip netns exec nsrouter iptables -t nat -X psid +} + +for n in $ns_all; do + ip netns add $n + ip -net $n link set lo up +done + +for i in 1 2; do + ip link add veth0 netns nsclient$i type veth peer name veth$i netns nsrouter + + ip -net nsclient$i link set veth0 up + ip -net nsclient$i addr add $(ipv4 $i 2)/24 dev veth0 + + ip -net nsrouter link set veth$i up + ip -net nsrouter addr add $(ipv4 $i 1)/24 dev veth$i +done + +ip -net nsclient1 route add default via $(ipv4 1 1) +ip -net nsclient2 route add default via $(ipv4 2 1) + +ip netns exec nsrouter sysctl -q net.ipv4.conf.all.forwarding=1 + +offset_len=0 +psid_length=8 +for psid in 0 52; do + run_test + if [ $? -ne 0 ]; then + break + fi +done + +offset_len=6 +psid_length=8 +for psid in 0 52; do + run_test + if [ $? -ne 0 ]; then + break + fi +done + +cleanup +exit $ret