From patchwork Mon Jul 12 00:55:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Fedorenko X-Patchwork-Id: 12369537 X-Patchwork-Delegate: kuba@kernel.org 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 6BD2FC07E9C for ; Mon, 12 Jul 2021 00:56:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A2756105A for ; Mon, 12 Jul 2021 00:56:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232307AbhGLA65 (ORCPT ); Sun, 11 Jul 2021 20:58:57 -0400 Received: from novek.ru ([213.148.174.62]:38612 "EHLO novek.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232090AbhGLA64 (ORCPT ); Sun, 11 Jul 2021 20:58:56 -0400 Received: from nat1.ooonet.ru (gw.zelenaya.net [91.207.137.40]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by novek.ru (Postfix) with ESMTPSA id 85B71503DBE; Mon, 12 Jul 2021 03:53:51 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 novek.ru 85B71503DBE DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=novek.ru; s=mail; t=1626051233; bh=86iThziDPuXHF8GrrUvXMFq7EUJ/xE6ilKQbeXlU//Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WqlLpLGZW1xt71gP/jf6MY9qoOvychBvfSnWeTDIb8Czdu3WtluajhBUmpj4J+X3q 97ocFbMufIiYTriqM1KyQheJGuVSO3+wENvTMrVQQHGKsKb4r3lKchViUFDSZ700vI nrA0u6TiOW0wvciVvh/YM0cWid48NqzoJe72PSTM= From: Vadim Fedorenko To: David Ahern , Willem de Bruijn , Paolo Abeni , Xin Long Cc: Jakub Kicinski , "David S. Miller" , netdev@vger.kernel.org, Vadim Fedorenko Subject: [PATCH net 3/3] selftests: net: add ESP-in-UDP PMTU test Date: Mon, 12 Jul 2021 03:55:54 +0300 Message-Id: <20210712005554.26948-4-vfedorenko@novek.ru> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20210712005554.26948-1-vfedorenko@novek.ru> References: <20210712005554.26948-1-vfedorenko@novek.ru> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org The case of ESP in UDP encapsulation was not covered before Signed-off-by: Vadim Fedorenko --- tools/testing/selftests/net/nettest.c | 55 +++++++++++++- tools/testing/selftests/net/pmtu.sh | 104 +++++++++++++++++++++++++- 2 files changed, 154 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/net/nettest.c b/tools/testing/selftests/net/nettest.c index 6365c7fd1262..bd6288302094 100644 --- a/tools/testing/selftests/net/nettest.c +++ b/tools/testing/selftests/net/nettest.c @@ -11,9 +11,11 @@ #include #include #include +#include #include #include #include +#include #include #include #include @@ -27,6 +29,10 @@ #include #include +#include +#include +#include + #ifndef IPV6_UNICAST_IF #define IPV6_UNICAST_IF 76 #endif @@ -114,6 +120,9 @@ struct sock_args { struct in_addr in; struct in6_addr in6; } expected_raddr; + + /* ESP in UDP encap test */ + int use_xfrm; }; static int server_mode; @@ -1346,6 +1355,41 @@ static int bind_socket(int sd, struct sock_args *args) return 0; } +static int config_xfrm_policy(int sd, struct sock_args *args) +{ + struct xfrm_userpolicy_info policy = {}; + int type = UDP_ENCAP_ESPINUDP; + int xfrm_af = IP_XFRM_POLICY; + int level = SOL_IP; + + if (args->type != SOCK_DGRAM) { + log_error("Invalid socket type. Only DGRAM could be used for XFRM\n"); + return 1; + } + + policy.action = XFRM_POLICY_ALLOW; + policy.sel.family = args->version; + if (args->version == AF_INET6) { + xfrm_af = IPV6_XFRM_POLICY; + level = SOL_IPV6; + } + + policy.dir = XFRM_POLICY_OUT; + if (setsockopt(sd, level, xfrm_af, &policy, sizeof(policy)) < 0) + return 1; + + policy.dir = XFRM_POLICY_IN; + if (setsockopt(sd, level, xfrm_af, &policy, sizeof(policy)) < 0) + return 1; + + if (setsockopt(sd, IPPROTO_UDP, UDP_ENCAP, &type, sizeof(type)) < 0) { + log_err_errno("Failed to set xfrm encap"); + return 1; + } + + return 0; +} + static int lsock_init(struct sock_args *args) { long flags; @@ -1389,6 +1433,11 @@ static int lsock_init(struct sock_args *args) if (fcntl(sd, F_SETFD, FD_CLOEXEC) < 0) log_err_errno("Failed to set close-on-exec flag"); + if (args->use_xfrm && config_xfrm_policy(sd, args)) { + log_err_errno("Failed to set xfrm policy"); + goto err; + } + out: return sd; @@ -1772,7 +1821,7 @@ static int ipc_parent(int cpid, int fd, struct sock_args *args) return client_status; } -#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:M:X:m:d:I:BN:O:SCi6L:0:1:2:3:Fbq" +#define GETOPT_STR "sr:l:c:p:t:g:P:DRn:M:X:m:d:I:BN:O:SCi6xL:0:1:2:3:Fbq" static void print_usage(char *prog) { @@ -1795,6 +1844,7 @@ static void print_usage(char *prog) " -D|R datagram (D) / raw (R) socket (default stream)\n" " -l addr local address to bind to in server mode\n" " -c addr local address to bind to in client mode\n" + " -x configure XFRM policy on socket\n" "\n" " -d dev bind socket to given device name\n" " -I dev bind socket to given device name - server mode\n" @@ -1966,6 +2016,9 @@ int main(int argc, char *argv[]) case 'q': quiet = 1; break; + case 'x': + args.use_xfrm = 1; + break; default: print_usage(argv[0]); return 1; diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh index 64cd2e23c568..e33152a55508 100755 --- a/tools/testing/selftests/net/pmtu.sh +++ b/tools/testing/selftests/net/pmtu.sh @@ -118,6 +118,9 @@ # below for IPv6 doesn't apply here, because, on IPv4, administrative MTU # changes alone won't affect PMTU # +# - pmtu_vti4_udp_exception +# Same as pmtu_vti4_exception, but using ESP-in-UDP +# # - pmtu_vti6_exception # Set up vti6 tunnel on top of veth, with xfrm states and policies, in two # namespaces with matching endpoints. Check that route exception is @@ -125,6 +128,9 @@ # decrease and increase MTU of tunnel, checking that route exception PMTU # changes accordingly # +# - pmtu_vti6_udp_exception +# Same as pmtu_vti6_exception, but using ESP-in-UDP +# # - pmtu_vti4_default_mtu # Set up vti4 tunnel on top of veth, in two namespaces with matching # endpoints. Check that MTU assigned to vti interface is the MTU of the @@ -224,6 +230,8 @@ tests=" pmtu_ipv6_ipv6_exception IPv6 over IPv6: PMTU exceptions 1 pmtu_vti6_exception vti6: PMTU exceptions 0 pmtu_vti4_exception vti4: PMTU exceptions 0 + pmtu_vti6_udp_exception vti6: PMTU exceptions (ESP-in-UDP) 0 + pmtu_vti4_udp_exception vti4: PMTU exceptions (ESP-in-UDP) 0 pmtu_vti4_default_mtu vti4: default MTU assignment 0 pmtu_vti6_default_mtu vti6: default MTU assignment 0 pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 0 @@ -326,6 +334,7 @@ dummy6_mask="64" err_buf= tcpdump_pids= +nettest_pids= err() { err_buf="${err_buf}${1} @@ -619,18 +628,30 @@ setup_xfrm() { proto=${1} veth_a_addr="${2}" veth_b_addr="${3}" + encap=${4} - run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel || return 1 - run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel + run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} || return 1 + run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} run_cmd ${ns_a} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel run_cmd ${ns_a} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel - run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel - run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel + run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} + run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} run_cmd ${ns_b} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel run_cmd ${ns_b} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel } +setup_nettest_xfrm() { + proto=${1} + port=${2} + + run_cmd ${ns_a} nettest -${proto} -D -s -i -p ${port} 2> /dev/null & + nettest_pids="${nettest_pids} $!" + + run_cmd ${ns_b} nettest -${proto} -D -s -i -p ${port} 2> /dev/null & + nettest_pids="${nettest_pids} $!" +} + setup_xfrm4() { setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} } @@ -639,6 +660,16 @@ setup_xfrm6() { setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} } +setup_xfrm4udp() { + setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} "encap espinudp 4500 4500 0.0.0.0" + setup_nettest_xfrm 4 4500 +} + +setup_xfrm6udp() { + setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} "encap espinudp 4500 4500 0.0.0.0" + setup_nettest_xfrm 6 4500 +} + setup_routing_old() { for i in ${routes}; do [ "${ns}" = "" ] && ns="${i}" && continue @@ -823,6 +854,11 @@ cleanup() { done tcpdump_pids= + for pid in ${nettest_pids}; do + kill ${pid} + done + nettest_pids= + for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do ip netns del ${n} 2> /dev/null done @@ -1432,6 +1468,66 @@ test_pmtu_vti6_exception() { return ${fail} } +test_pmtu_vti4_udp_exception() { + setup namespaces veth vti4 xfrm4udp || return $ksft_skip + trace "${ns_a}" veth_a "${ns_b}" veth_b \ + "${ns_a}" vti4_a "${ns_b}" vti4_b + + veth_mtu=1500 + vti_mtu=$((veth_mtu - 20)) + + # UDP SPI SN IV ICV pad length next header + esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) + ping_payload=$((esp_payload_rfc4106 - 28)) + + mtu "${ns_a}" veth_a ${veth_mtu} + mtu "${ns_b}" veth_b ${veth_mtu} + mtu "${ns_a}" vti4_a ${vti_mtu} + mtu "${ns_b}" vti4_b ${vti_mtu} + + # Send DF packet without exceeding link layer MTU, check that no + # exception is created + run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} + pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" + check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 + + # Now exceed link layer MTU by one byte, check that exception is created + # with the right PMTU value + run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} + pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" + check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" +} + +test_pmtu_vti6_udp_exception() { + setup namespaces veth vti6 xfrm6udp || return $ksft_skip + trace "${ns_a}" veth_a "${ns_b}" veth_b \ + "${ns_a}" vti6_a "${ns_b}" vti6_b + fail=0 + + # Create route exception by exceeding link layer MTU + mtu "${ns_a}" veth_a 4000 + mtu "${ns_b}" veth_b 4000 + mtu "${ns_a}" vti6_a 5000 + mtu "${ns_b}" vti6_b 5000 + run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} + + # Check that exception was created + pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" + check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 + + # Decrease tunnel MTU, check for PMTU decrease in route exception + mtu "${ns_a}" vti6_a 3000 + pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" + check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 + + # Increase tunnel MTU, check for PMTU increase in route exception + mtu "${ns_a}" vti6_a 9000 + pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" + check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 + + return ${fail} +} + test_pmtu_vti4_default_mtu() { setup namespaces veth vti4 || return $ksft_skip