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So, do not extract route hint for packets whose destination is part of multipath group. Fixes: 02b24941619f ("ipv4: use dst hint for ipv4 list receive") Signed-off-by: Sriram Yagnaraman --- include/net/ip.h | 1 + net/ipv4/ip_input.c | 3 ++- net/ipv4/route.c | 1 + 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/include/net/ip.h b/include/net/ip.h index 332521170d9b..bdce572fa422 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -57,6 +57,7 @@ struct inet_skb_parm { #define IPSKB_FRAG_PMTU BIT(6) #define IPSKB_L3SLAVE BIT(7) #define IPSKB_NOPOLICY BIT(8) +#define IPSKB_MULTIPATH BIT(9) u16 frag_max_size; }; diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index fe9ead9ee863..5e9c8156656a 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -584,7 +584,8 @@ static void ip_sublist_rcv_finish(struct list_head *head) static struct sk_buff *ip_extract_route_hint(const struct net *net, struct sk_buff *skb, int rt_type) { - if (fib4_has_custom_rules(net) || rt_type == RTN_BROADCAST) + if (fib4_has_custom_rules(net) || rt_type == RTN_BROADCAST || + IPCB(skb)->flags & IPSKB_MULTIPATH) return NULL; return skb; diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 92fede388d52..33626619aee7 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2144,6 +2144,7 @@ static int ip_mkroute_input(struct sk_buff *skb, int h = fib_multipath_hash(res->fi->fib_net, NULL, skb, hkeys); fib_select_multipath(res, h); + IPCB(skb)->flags |= IPSKB_MULTIPATH; } #endif From patchwork Sat Aug 19 11:48:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sriram Yagnaraman X-Patchwork-Id: 13358605 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E50234A2C for ; Sat, 19 Aug 2023 11:50:57 +0000 (UTC) Received: from EUR01-VE1-obe.outbound.protection.outlook.com (mail-ve1eur01on2138.outbound.protection.outlook.com [40.107.14.138]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0A6333C10; Sat, 19 Aug 2023 04:48:39 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=jNhjzywRzUrJjkB2RFLHx5GIyV/JyzcxsyCRpGAqqkNaoUS/uJU5dPOjNZhigUPgvTSthDZSk4mq50fkXPx+u8bFS39Wi6NC+VrjgCSbr7zrUrDEk6J5vNU38Wq0h09XqzIZ3Vf3HkwKyM3uzmEu1x8YCyYIB0E9INuiJK1Ur5lJFFe1A2syMi66t4WtXn3ns9YX+NcKy4mDt7Wzom50E9doChrMJ1l8ssSs5BBxG7Z8ikhtPpMr056udlMdcG7aMsJyzrZD1QEt/vcVLBUkWfniFxiUkb5HebwQf53CVBAR2PPvR9UEn1+/DKzw80ovDHfrCjG9NTNfl6gQSVGtjQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=WJ2YzlcVi6EnBaE6c23fRg75/fbGRMCYIYYVhtNnaco=; b=ZfIv3OvvMFTJbwH2H6Bb1ooagaom6ewL3EHP4PxaWv1QmgAItdWKlw2/6stH/kz8OjVZ1qat3w2ICOABq+tNR/NwUWv8YjdJv4CA2E0ugjpZc+3FxjZ/DC87DtoMhb4nQBkeBxRKxop79yaQ9Jjl7eMyRZYfrzg5zScgMdVgtubcCibgcJA+0uBg6Fd4fUOVUYNrWEB2Xqi+OtHuikO7ucQgB84DLiJ9cRy9EYV12t2v5QuC7XQYBvGqtL8DJ5FWqfEVfieMxtoA+IdtBTcyixRne3vw52iZ77AqV9xNm+pUdqmylghAZ4uZs4HRM9C5xtqvBp8okBg7wbhT7ICOcg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=est.tech; dmarc=pass action=none header.from=est.tech; dkim=pass header.d=est.tech; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=estab.onmicrosoft.com; s=selector2-estab-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=WJ2YzlcVi6EnBaE6c23fRg75/fbGRMCYIYYVhtNnaco=; b=Jr22gqDyNVeUSOa+PTtzC/XFhMtl3mespX+kJIJLndW9ZK/m8jpgm3v17o3A0Mbp7/zs0Dr4tyewe+V/ZcSm/I4mQGFs+9fulcPwjpXKgg9c1VcAtmly7pQmkHlZhXiA1uVs3oX9N4lLWSvx7xdOoXuiA3GPEvjICXLKG3LPog0= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=est.tech; Received: from DBBP189MB1433.EURP189.PROD.OUTLOOK.COM (2603:10a6:10:1e7::15) by VE1P189MB1133.EURP189.PROD.OUTLOOK.COM (2603:10a6:800:14a::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6699.20; Sat, 19 Aug 2023 11:48:33 +0000 Received: from DBBP189MB1433.EURP189.PROD.OUTLOOK.COM ([fe80::759b:94eb:c2e8:c670]) by DBBP189MB1433.EURP189.PROD.OUTLOOK.COM ([fe80::759b:94eb:c2e8:c670%6]) with mapi id 15.20.6699.020; Sat, 19 Aug 2023 11:48:32 +0000 From: Sriram Yagnaraman To: Cc: netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, "David S . 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So, do not extract route hint for packets whose destination is part of multipath group. Fixes: 197dbf24e360 ("ipv6: introduce and uses route look hints for list input.") Signed-off-by: Sriram Yagnaraman --- include/linux/ipv6.h | 1 + net/ipv6/ip6_input.c | 3 ++- net/ipv6/route.c | 2 ++ 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index 839247a4f48e..fe3492a67b35 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -146,6 +146,7 @@ struct inet6_skb_parm { #define IP6SKB_JUMBOGRAM 128 #define IP6SKB_SEG6 256 #define IP6SKB_FAKEJUMBO 512 +#define IP6SKB_MULTIPATH 1024 }; #if defined(CONFIG_NET_L3_MASTER_DEV) diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index d94041bb4287..b8378814532c 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -99,7 +99,8 @@ static bool ip6_can_use_hint(const struct sk_buff *skb, static struct sk_buff *ip6_extract_route_hint(const struct net *net, struct sk_buff *skb) { - if (fib6_routes_require_src(net) || fib6_has_custom_rules(net)) + if (fib6_routes_require_src(net) || fib6_has_custom_rules(net) || + IP6CB(skb)->flags & IP6SKB_MULTIPATH) return NULL; return skb; diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 56a55585eb79..4631e03c84b4 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -424,6 +424,8 @@ void fib6_select_path(const struct net *net, struct fib6_result *res, if (match->nh && have_oif_match && res->nh) return; + IP6CB(skb)->flags |= IP6SKB_MULTIPATH; + /* We might have already computed the hash for ICMPv6 errors. 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Test IPv4 and IPv6 multipath routing from h1 to h2/h3 via router r1 where a multipath route is setup to load-balance between h2 and h3. See diagram in the test for more information. Signed-off-by: Sriram Yagnaraman --- .../testing/selftests/net/forwarding/Makefile | 1 + .../net/forwarding/router_multipath_vip.sh | 403 ++++++++++++++++++ 2 files changed, 404 insertions(+) create mode 100755 tools/testing/selftests/net/forwarding/router_multipath_vip.sh diff --git a/tools/testing/selftests/net/forwarding/Makefile b/tools/testing/selftests/net/forwarding/Makefile index 770efbe24f0d..bf4e5745fd5c 100644 --- a/tools/testing/selftests/net/forwarding/Makefile +++ b/tools/testing/selftests/net/forwarding/Makefile @@ -70,6 +70,7 @@ TEST_PROGS = bridge_igmp.sh \ router_mpath_nh.sh \ router_multicast.sh \ router_multipath.sh \ + router_multipath_vip.sh \ router_nh.sh \ router.sh \ router_vid_1.sh \ diff --git a/tools/testing/selftests/net/forwarding/router_multipath_vip.sh b/tools/testing/selftests/net/forwarding/router_multipath_vip.sh new file mode 100755 index 000000000000..15c7598d42df --- /dev/null +++ b/tools/testing/selftests/net/forwarding/router_multipath_vip.sh @@ -0,0 +1,403 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 + +# +--------------------+ +----------------------+ +# | H1 | | H2 | +# | | | | +# | $h1 + | | + $h2 | +# | 192.0.2.2/24 | | | | 198.51.100.2/24 | +# | 2001:db8:1::2/64 | | | | 2001:db8:2::2/64 | +# | | | | | | +# +------------------|-+ +-|--------------------+ +# | | +# +------------------|-------------------------|--------------------+ +# | SW | | | +# | | | | +# | $rp1 + + $rp2 | +# | 192.0.2.1/24 198.51.100.1/24 | +# | 2001:db8:1::1/64 + vip 2001:db8:2::1/64 | +# | 198.18.0.0/24 | +# | 2001:db8:18::/64 + $rp3 | +# | | 203.0.113.1/24 | +# | | 2001:db8:3::1/64 | +# | | | +# | | | +# +--------------------------------------------|--------------------+ +# | +# +-|--------------------+ +# | | H3 | +# | | | +# | | 203.0.113.2/24 | +# | | 2001:db8:3::2/64 | +# | + $h3 | +# | | +# +----------------------+ + +ALL_TESTS="ping_ipv4 ping_ipv6 multipath_test" +NUM_NETIFS=6 +source lib.sh + +ns_create() +{ + ns=$1 + + ip netns add $ns + in_ns $ns ip link set dev lo up + in_ns $ns sysctl -q -w net.ipv4.ip_forward=1 + in_ns $ns sysctl -q -w net.ipv6.conf.all.forwarding=1 +} + +ns_destroy() +{ + ip netns del $1 +} + +h1_create() +{ + local ns="ns-h1" + + ns_create $ns + ip link set dev $h1 netns $ns + + in_ns $ns ip link set dev $h1 up + + in_ns $ns ip address add 192.0.2.2/24 dev $h1 + in_ns $ns ip address add 2001:db8:1::2/64 dev $h1 + + in_ns $ns ip route add default via 192.0.2.1 + in_ns $ns ip route add default via 2001:db8:1::1 +} + +h1_destroy() +{ + local ns="ns-h1" + + in_ns $ns ip route del default via 2001:db8:1::1 + in_ns $ns ip route del default via 192.0.2.1 + + in_ns $ns ip address del 2001:db8:1::2/64 dev $h1 + in_ns $ns ip address del 192.0.2.2/24 dev $h1 + + in_ns $ns ip link set dev $h1 down + in_ns $ns ip link set dev $h1 netns 1 + ns_destroy $ns +} + +h2_create() +{ + local ns="ns-h2" + + ns_create $ns + ip link set dev $h2 netns $ns + + in_ns $ns ip link set dev $h2 up + + in_ns $ns ip address add 198.51.100.2/24 dev $h2 + in_ns $ns ip address add 2001:db8:2::2/64 dev $h2 + + in_ns $ns ip address add 198.18.0.0/24 dev lo + in_ns $ns ip address add 2001:db8:18::/64 dev lo + + in_ns $ns ip route add 192.0.2.0/24 via 198.51.100.1 + in_ns $ns ip route add 2001:db8:1::/64 nexthop via 2001:db8:2::1 +} + +h2_destroy() +{ + local ns="ns-h2" + + in_ns $ns ip route del 2001:db8:1::/64 nexthop via 2001:db8:2::1 + in_ns $ns ip route del 192.0.2.0/24 via 198.51.100.1 + + in_ns $ns ip address del 2001:db8:18::/64 dev lo + in_ns $ns ip address del 198.18.0.0/24 dev lo + + in_ns $ns ip address del 2001:db8:2::2/64 dev $h2 + in_ns $ns ip address del 198.51.100.2/24 dev $h2 + + in_ns $ns ip link set dev $h2 down + in_ns $ns ip link set dev $h2 netns 1 + ns_destroy $ns +} + +h3_create() +{ + local ns="ns-h3" + + ns_create $ns + ip link set dev $h3 netns $ns + + in_ns $ns ip link set dev $h3 up + + in_ns $ns ip address add 203.0.113.2/24 dev $h3 + in_ns $ns ip address add 2001:db8:3::2/64 dev $h3 + + in_ns $ns ip address add 198.18.0.0/24 dev lo + in_ns $ns ip address add 2001:db8:18::/64 dev lo + + in_ns $ns ip route add 192.0.2.0/24 via 203.0.113.1 + in_ns $ns ip route add 2001:db8:1::/64 nexthop via 2001:db8:3::1 +} + +h3_destroy() +{ + local ns="ns-h3" + + in_ns $ns ip route del 2001:db8:1::/64 nexthop via 2001:db8:3::1 + in_ns $ns ip route del 192.0.2.0/24 via 203.0.113.1 + + in_ns $ns ip address del 198.18.0.0/24 dev lo + in_ns $ns ip address del 2001:db8:18::/64 dev lo + + in_ns $ns ip address del 2001:db8:3::2/64 dev $h3 + in_ns $ns ip address del 203.0.113.2/24 dev $h3 + + in_ns $ns ip link set dev $h3 down + in_ns $ns ip link set dev $h3 netns 1 + ns_destroy $ns +} + +router1_create() +{ + local ns="ns-r1" + + ns_create $ns + ip link set dev $rp1 netns $ns + ip link set dev $rp2 netns $ns + ip link set dev $rp3 netns $ns + + in_ns $ns ip link set dev $rp1 up + in_ns $ns ip link set dev $rp2 up + in_ns $ns ip link set dev $rp3 up + + in_ns $ns ip address add 192.0.2.1/24 dev $rp1 + in_ns $ns ip address add 2001:db8:1::1/64 dev $rp1 + + in_ns $ns ip address add 198.51.100.1/24 dev $rp2 + in_ns $ns ip address add 2001:db8:2::1/64 dev $rp2 + + in_ns $ns ip address add 203.0.113.1/24 dev $rp3 + in_ns $ns ip address add 2001:db8:3::1/64 dev $rp3 + + in_ns $ns ip route add 198.18.0.0/24 \ + nexthop via 198.51.100.2 \ + nexthop via 203.0.113.2 + in_ns $ns ip route add 2001:db8:18::/64 \ + nexthop via 2001:db8:2::2 \ + nexthop via 2001:db8:3::2 +} + +router1_destroy() +{ + local ns="ns-r1" + + in_ns $ns ip route del 2001:db8:18::/64 + in_ns $ns ip route del 198.18.0.0/24 + + in_ns $ns ip address del 2001:db8:3::1/64 dev $rp3 + in_ns $ns ip address del 203.0.113.1/24 dev $rp3 + + in_ns $ns ip address del 2001:db8:2::1/64 dev $rp2 + in_ns $ns ip address del 198.51.100.1/24 dev $rp2 + + in_ns $ns ip address del 2001:db8:1::1/64 dev $rp1 + in_ns $ns ip address del 192.0.2.1/24 dev $rp1 + + in_ns $ns ip link set dev $rp3 down + in_ns $ns ip link set dev $rp2 down + in_ns $ns ip link set dev $rp1 down + + in_ns $ns ip link set dev $rp3 netns 1 + in_ns $ns ip link set dev $rp2 netns 1 + in_ns $ns ip link set dev $rp1 netns 1 + ns_destroy $ns +} + +multipath4_test() +{ + local desc="$1" + local weight_rp2=$2 + local weight_rp3=$3 + local t0_rp2 t0_rp3 t1_rp2 t1_rp3 + local packets_rp2 packets_rp3 + + # Transmit multiple flows from h1 to h2 and make sure they are + # distributed between both multipath links (rp2 and rp3) + # according to the configured weights. + in_ns ns-r1 sysctl_set net.ipv4.fib_multipath_hash_policy 1 + in_ns ns-r1 ip route replace 198.18.0.0/24 \ + nexthop via 198.51.100.2 weight $weight_rp2 \ + nexthop via 203.0.113.2 weight $weight_rp3 + + t0_rp2=$(in_ns ns-r1 link_stats_tx_packets_get $rp2) + t0_rp3=$(in_ns ns-r1 link_stats_tx_packets_get $rp3) + + in_ns ns-h1 $MZ $h1 -q -p 64 -A 192.0.2.2 -B 198.18.0.0 \ + -d 1msec -t udp "sp=1024,dp=0-32768" + + t1_rp2=$(in_ns ns-r1 link_stats_tx_packets_get $rp2) + t1_rp3=$(in_ns ns-r1 link_stats_tx_packets_get $rp3) + + let "packets_rp2 = $t1_rp2 - $t0_rp2" + let "packets_rp3 = $t1_rp3 - $t0_rp3" + in_ns ns-r1 multipath_eval "$desc" $weight_rp2 $weight_rp3 $packets_rp2 $packets_rp3 + + in_ns ns-r1 ip route replace 198.18.0.0/24 \ + nexthop via 198.51.100.2 \ + nexthop via 203.0.113.2 + + in_ns ns-r1 sysctl_restore net.ipv4.fib_multipath_hash_policy +} + +multipath6_l4_test() +{ + local desc="$1" + local weight_rp2=$2 + local weight_rp3=$3 + local t0_rp2 t0_rp3 t1_rp2 t1_rp3 + local packets_rp2 packets_rp3 + + # Transmit multiple flows from h1 to h2 and make sure they are + # distributed between both multipath links (rp2 and rp3) + # according to the configured weights. + in_ns ns-r1 sysctl_set net.ipv6.fib_multipath_hash_policy 1 + in_ns ns-r1 ip route replace 2001:db8:18::/64 \ + nexthop via 2001:db8:2::2 weight $weight_rp2 \ + nexthop via 2001:db8:3::2 weight $weight_rp3 + + t0_rp2=$(in_ns ns-r1 link_stats_tx_packets_get $rp2) + t0_rp3=$(in_ns ns-r1 link_stats_tx_packets_get $rp3) + + in_ns ns-h1 $MZ $h1 -6 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:18::0 \ + -d 1msec -t udp "sp=1024,dp=0-32768" + + t1_rp2=$(in_ns ns-r1 link_stats_tx_packets_get $rp2) + t1_rp3=$(in_ns ns-r1 link_stats_tx_packets_get $rp3) + + let "packets_rp2 = $t1_rp2 - $t0_rp2" + let "packets_rp3 = $t1_rp3 - $t0_rp3" + in_ns ns-r1 multipath_eval "$desc" $weight_rp2 $weight_rp3 $packets_rp2 $packets_rp3 + + in_ns ns-r1 ip route replace 2001:db8:18::/64 \ + nexthop via 2001:db8:2::2 \ + nexthop via 2001:db8:3::2 + + in_ns ns-r1 sysctl_restore net.ipv6.fib_multipath_hash_policy +} + +multipath_test() +{ + log_info "Running IPv4 multipath tests" + multipath4_test "ECMP" 1 1 + multipath4_test "Weighted MP 2:1" 2 1 + multipath4_test "Weighted MP 11:45" 11 45 + + log_info "Running IPv6 L4 hash multipath tests" + multipath6_l4_test "ECMP" 1 1 + multipath6_l4_test "Weighted MP 2:1" 2 1 + multipath6_l4_test "Weighted MP 11:45" 11 45 +} + +setup_prepare() +{ + h1=${NETIFS[p1]} + rp1=${NETIFS[p2]} + + rp2=${NETIFS[p3]} + h2=${NETIFS[p4]} + + rp3=${NETIFS[p5]} + h3=${NETIFS[p6]} + + h1_create + h2_create + h3_create + + router1_create + + forwarding_enable +} + +setup_wait() +{ + h1=${NETIFS[p1]} + rp1=${NETIFS[p2]} + + rp2=${NETIFS[p3]} + h2=${NETIFS[p4]} + + rp3=${NETIFS[p5]} + h3=${NETIFS[p6]} + + in_ns ns-h1 setup_wait_dev $h1 + in_ns ns-h2 setup_wait_dev $h2 + in_ns ns-h3 setup_wait_dev $h3 + in_ns ns-r1 setup_wait_dev $rp1 + in_ns ns-r1 setup_wait_dev $rp2 + in_ns ns-r1 setup_wait_dev $rp3 + + # Make sure links are ready. + sleep $WAIT_TIME +} + +cleanup() +{ + pre_cleanup + + forwarding_restore + + router1_destroy + + h3_destroy + h2_destroy + h1_destroy +} + +ping_test() +{ + RET=0 + + local ns=$1 + local dip=$2 + local args=$3 + + in_ns $ns $PING $args $dip -c $PING_COUNT -i 0.1 \ + -w $PING_TIMEOUT &> /dev/null + check_err $? + log_test "ping$args" +} + +ping6_test() +{ + RET=0 + + local ns=$1 + local dip=$2 + local args=$3 + + in_ns $ns $PING6 $args $dip -c $PING_COUNT -i 0.1 \ + -w $PING_TIMEOUT &> /dev/null + check_err $? + log_test "ping6$args" +} + +ping_ipv4() +{ + ping_test ns-h1 198.51.100.2 + ping_test ns-h1 203.0.113.2 +} + +ping_ipv6() +{ + ping6_test ns-h1 2001:db8:2::2 + ping6_test ns-h1 2001:db8:3::2 +} + +trap cleanup EXIT + +setup_prepare +setup_wait + +tests_run + +exit $EXIT_STATUS