Commit 7650b1a9 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'mp-inner-L3' 



Stephen Suryaputra says:

====================
net: Multipath hashing on inner L3

This series extends commit 363887a2 ("ipv4: Support multipath
hashing on inner IP pkts for GRE tunnel") to include support when the
outer L3 is IPv6 and to consider the case where the inner L3 is
different version from the outer L3, such as IPv6 tunneled by IPv4 GRE
or vice versa. It also includes kselftest scripts to test the use cases.

v2: Clarify the commit messages in the commits in this series to use the
    term tunneled by IPv4 GRE or by IPv6 GRE so that it's clear which
    one is the inner and which one is the outer (per David Miller).
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents faf5577f 2800f248

Documentation/networking/ip-sysctl.txt

+1 −0
Original line number Diff line number Diff line
@@ -1473,6 +1473,7 @@ fib_multipath_hash_policy - INTEGER 
	Possible values:

	0 - Layer 3 (source and destination addresses plus flow label)

	1 - Layer 4 (standard 5-tuple)

	2 - Layer 3 or inner Layer 3 if present



anycast_src_echo_reply - BOOLEAN

	Controls the use of anycast addresses as source addresses for ICMPv6

net/ipv4/route.c

+17 −4
Original line number Diff line number Diff line
@@ -1964,17 +1964,30 @@ int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, 
		break;

	case 2:

		memset(&hash_keys, 0, sizeof(hash_keys));

		hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

		/* skb is currently provided only when forwarding */

		if (skb) {

			struct flow_keys keys;



			skb_flow_dissect_flow_keys(skb, &keys, 0);



			/* Inner can be v4 or v6 */

			if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

				hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src;

				hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst;

			} else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;

				hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src;

				hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst;

				hash_keys.tags.flow_label = keys.tags.flow_label;

				hash_keys.basic.ip_proto = keys.basic.ip_proto;

			} else {

				/* Same as case 0 */

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

				ip_multipath_l3_keys(skb, &hash_keys);

			}

		} else {

			/* Same as case 0 */

			hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

			hash_keys.addrs.v4addrs.src = fl4->saddr;

			hash_keys.addrs.v4addrs.dst = fl4->daddr;

		}

net/ipv6/route.c

+36 −0
Original line number Diff line number Diff line
@@ -2370,6 +2370,42 @@ u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, 
			hash_keys.basic.ip_proto = fl6->flowi6_proto;

		}

		break;

	case 2:

		memset(&hash_keys, 0, sizeof(hash_keys));

		hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;

		if (skb) {

			struct flow_keys keys;



			if (!flkeys) {

				skb_flow_dissect_flow_keys(skb, &keys, 0);

				flkeys = &keys;

			}



			/* Inner can be v4 or v6 */

			if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;

				hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src;

				hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst;

			} else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;

				hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;

				hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;

				hash_keys.tags.flow_label = flkeys->tags.flow_label;

				hash_keys.basic.ip_proto = flkeys->basic.ip_proto;

			} else {

				/* Same as case 0 */

				hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;

				ip6_multipath_l3_keys(skb, &hash_keys, flkeys);

			}

		} else {

			/* Same as case 0 */

			hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;

			hash_keys.addrs.v6addrs.src = fl6->saddr;

			hash_keys.addrs.v6addrs.dst = fl6->daddr;

			hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);

			hash_keys.basic.ip_proto = fl6->flowi6_proto;

		}

		break;

	}

	mhash = flow_hash_from_keys(&hash_keys);

tools/testing/selftests/net/forwarding/gre_inner_v4_multipath.sh

0 → 100755
+305 −0
Original line number Diff line number Diff line 
#!/bin/bash

# SPDX-License-Identifier: GPL-2.0



# Test traffic distribution when there are multiple routes between an IPv4

# GRE tunnel. The tunnel carries IPv4 traffic between multiple hosts.

# Multiple routes are in the underlay network. With the default multipath

# policy, SW2 will only look at the outer IP addresses, hence only a single

# route would be used.

#

# +-------------------------+

# | H1                      |

# |               $h1 +     |

# | 192.0.3.{2-62}/24 |     |

# +-------------------|-----+

#                     |

# +-------------------|------------------------+

# | SW1               |                        |

# |              $ol1 +                        |

# |      192.0.3.1/24                          |

# |                                            |

# |  + g1 (gre)                                |

# |    loc=192.0.2.65                          |

# |    rem=192.0.2.66 --.                      |

# |    tos=inherit      |                      |

# |                     v                      |

# |                     + $ul1                 |

# |                     | 192.0.2.129/28       |

# +---------------------|----------------------+

#                       |

# +---------------------|----------------------+

# | SW2                 |                      |

# |               $ul21 +                      |

# |      192.0.2.130/28                        |

# |                   |                        |

# !   ________________|_____                   |

# |  /                      \                  |

# |  |                      |                  |

# |  + $ul22.111 (vlan)     + $ul22.222 (vlan) |

# |  | 192.0.2.145/28       | 192.0.2.161/28   |

# |  |                      |                  |

# +--|----------------------|------------------+

#    |                      |

# +--|----------------------|------------------+

# |  |                      |                  |

# |  + $ul32.111 (vlan)     + $ul32.222 (vlan) |

# |  | 192.0.2.146/28       | 192.0.2.162/28   |

# |  |                      |                  |

# |  \______________________/                  |

# |                   |                        |

# |                   |                        |

# |               $ul31 +                      |

# |      192.0.2.177/28 |                  SW3 |

# +---------------------|----------------------+

#                       |

# +---------------------|----------------------+

# |                     + $ul4                 |

# |                     ^ 192.0.2.178/28       |

# |                     |                      |

# |  + g2 (gre)         |                      |

# |    loc=192.0.2.66   |                      |

# |    rem=192.0.2.65 --'                      |

# |    tos=inherit                             |

# |                                            |

# |               $ol4 +                       |

# |       192.0.4.1/24 |                   SW4 |

# +--------------------|-----------------------+

#                      |

# +--------------------|---------+

# |                    |         |

# |                $h2 +         |

# |  192.0.4.{2-62}/24        H2 |

# +------------------------------+



ALL_TESTS="

	ping_ipv4

	multipath_ipv4

"



NUM_NETIFS=10

source lib.sh



h1_create()

{

	simple_if_init $h1 192.0.3.2/24

	ip route add vrf v$h1 192.0.4.0/24 via 192.0.3.1

}



h1_destroy()

{

	ip route del vrf v$h1 192.0.4.0/24 via 192.0.3.1

	simple_if_fini $h1 192.0.3.2/24

}



sw1_create()

{

	simple_if_init $ol1 192.0.3.1/24

	__simple_if_init $ul1 v$ol1 192.0.2.129/28



	tunnel_create g1 gre 192.0.2.65 192.0.2.66 tos inherit dev v$ol1

	__simple_if_init g1 v$ol1 192.0.2.65/32

	ip route add vrf v$ol1 192.0.2.66/32 via 192.0.2.130



	ip route add vrf v$ol1 192.0.4.0/24 nexthop dev g1

}



sw1_destroy()

{

	ip route del vrf v$ol1 192.0.4.0/24



	ip route del vrf v$ol1 192.0.2.66/32

	__simple_if_fini g1 192.0.2.65/32

	tunnel_destroy g1



	__simple_if_fini $ul1 192.0.2.129/28

	simple_if_fini $ol1 192.0.3.1/24

}



sw2_create()

{

	simple_if_init $ul21 192.0.2.130/28

	__simple_if_init $ul22 v$ul21

	vlan_create $ul22 111 v$ul21 192.0.2.145/28

	vlan_create $ul22 222 v$ul21 192.0.2.161/28



	ip route add vrf v$ul21 192.0.2.65/32 via 192.0.2.129

	ip route add vrf v$ul21 192.0.2.66/32 \

	   nexthop via 192.0.2.146 \

	   nexthop via 192.0.2.162

}



sw2_destroy()

{

	ip route del vrf v$ul21 192.0.2.66/32

	ip route del vrf v$ul21 192.0.2.65/32



	vlan_destroy $ul22 222

	vlan_destroy $ul22 111

	__simple_if_fini $ul22

	simple_if_fini $ul21 192.0.2.130/28

}



sw3_create()

{

	simple_if_init $ul31 192.0.2.177/28

	__simple_if_init $ul32 v$ul31

	vlan_create $ul32 111 v$ul31 192.0.2.146/28

	vlan_create $ul32 222 v$ul31 192.0.2.162/28



	ip route add vrf v$ul31 192.0.2.66/32 via 192.0.2.178

	ip route add vrf v$ul31 192.0.2.65/32 \

	   nexthop via 192.0.2.145 \

	   nexthop via 192.0.2.161



	tc qdisc add dev $ul32 clsact

	tc filter add dev $ul32 ingress pref 111 prot 802.1Q \

	   flower vlan_id 111 action pass

	tc filter add dev $ul32 ingress pref 222 prot 802.1Q \

	   flower vlan_id 222 action pass

}



sw3_destroy()

{

	tc qdisc del dev $ul32 clsact



	ip route del vrf v$ul31 192.0.2.65/32

	ip route del vrf v$ul31 192.0.2.66/32



	vlan_destroy $ul32 222

	vlan_destroy $ul32 111

	__simple_if_fini $ul32

	simple_if_fini $ul31 192.0.2.177/28

}



sw4_create()

{

	simple_if_init $ol4 192.0.4.1/24

	__simple_if_init $ul4 v$ol4 192.0.2.178/28



	tunnel_create g2 gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol4

	__simple_if_init g2 v$ol4 192.0.2.66/32

	ip route add vrf v$ol4 192.0.2.65/32 via 192.0.2.177



	ip route add vrf v$ol4 192.0.3.0/24 nexthop dev g2

}



sw4_destroy()

{

	ip route del vrf v$ol4 192.0.3.0/24



	ip route del vrf v$ol4 192.0.2.65/32

	__simple_if_fini g2 192.0.2.66/32

	tunnel_destroy g2



	__simple_if_fini $ul4 192.0.2.178/28

	simple_if_fini $ol4 192.0.4.1/24

}



h2_create()

{

	simple_if_init $h2 192.0.4.2/24

	ip route add vrf v$h2 192.0.3.0/24 via 192.0.4.1

}



h2_destroy()

{

	ip route del vrf v$h2 192.0.3.0/24 via 192.0.4.1

	simple_if_fini $h2 192.0.4.2/24

}



setup_prepare()

{

	h1=${NETIFS[p1]}



	ol1=${NETIFS[p2]}

	ul1=${NETIFS[p3]}



	ul21=${NETIFS[p4]}

	ul22=${NETIFS[p5]}



	ul32=${NETIFS[p6]}

	ul31=${NETIFS[p7]}



	ul4=${NETIFS[p8]}

	ol4=${NETIFS[p9]}



	h2=${NETIFS[p10]}



	vrf_prepare

	h1_create

	sw1_create

	sw2_create

	sw3_create

	sw4_create

	h2_create



	forwarding_enable

}



cleanup()

{

	pre_cleanup



	forwarding_restore



	h2_destroy

	sw4_destroy

	sw3_destroy

	sw2_destroy

	sw1_destroy

	h1_destroy

	vrf_cleanup

}



multipath4_test()

{

	local what=$1; shift

	local weight1=$1; shift

	local weight2=$1; shift



	sysctl_set net.ipv4.fib_multipath_hash_policy 2

	ip route replace vrf v$ul21 192.0.2.66/32 \

	   nexthop via 192.0.2.146 weight $weight1 \

	   nexthop via 192.0.2.162 weight $weight2



	local t0_111=$(tc_rule_stats_get $ul32 111 ingress)

	local t0_222=$(tc_rule_stats_get $ul32 222 ingress)



	ip vrf exec v$h1 \

	   $MZ $h1 -q -p 64 -A "192.0.3.2-192.0.3.62" -B "192.0.4.2-192.0.4.62" \

	       -d 1msec -c 50 -t udp "sp=1024,dp=1024"

	sleep 1



	local t1_111=$(tc_rule_stats_get $ul32 111 ingress)

	local t1_222=$(tc_rule_stats_get $ul32 222 ingress)



	local d111=$((t1_111 - t0_111))

	local d222=$((t1_222 - t0_222))

	multipath_eval "$what" $weight1 $weight2 $d111 $d222



	ip route replace vrf v$ul21 192.0.2.66/32 \

	   nexthop via 192.0.2.146 \

	   nexthop via 192.0.2.162

	sysctl_restore net.ipv4.fib_multipath_hash_policy

}



ping_ipv4()

{

	ping_test $h1 192.0.4.2

}



multipath_ipv4()

{

	log_info "Running IPv4 over GRE over IPv4 multipath tests"

	multipath4_test "ECMP" 1 1

	multipath4_test "Weighted MP 2:1" 2 1

	multipath4_test "Weighted MP 11:45" 11 45

}



trap cleanup EXIT



setup_prepare

setup_wait

tests_run



exit $EXIT_STATUS

tools/testing/selftests/net/forwarding/gre_inner_v6_multipath.sh

0 → 100755
+306 −0
Original line number Diff line number Diff line 
#!/bin/bash

# SPDX-License-Identifier: GPL-2.0



# Test traffic distribution when there are multiple routes between an IPv4

# GRE tunnel. The tunnel carries IPv6 traffic between multiple hosts.

# Multiple routes are in the underlay network. With the default multipath

# policy, SW2 will only look at the outer IP addresses, hence only a single

# route would be used.

#

# +-------------------------+

# | H1                      |

# |               $h1 +     |

# |  2001:db8:1::2/64 |     |

# +-------------------|-----+

#                     |

# +-------------------|------------------------+

# | SW1               |                        |

# |              $ol1 +                        |

# |  2001:db8:1::1/64                          |

# |                                            |

# |  + g1 (gre)                                |

# |    loc=192.0.2.65                          |

# |    rem=192.0.2.66 --.                      |

# |    tos=inherit      |                      |

# |                     v                      |

# |                     + $ul1                 |

# |                     | 192.0.2.129/28       |

# +---------------------|----------------------+

#                       |

# +---------------------|----------------------+

# | SW2                 |                      |

# |               $ul21 +                      |

# |      192.0.2.130/28                        |

# |                   |                        |

# !   ________________|_____                   |

# |  /                      \                  |

# |  |                      |                  |

# |  + $ul22.111 (vlan)     + $ul22.222 (vlan) |

# |  | 192.0.2.145/28       | 192.0.2.161/28   |

# |  |                      |                  |

# +--|----------------------|------------------+

#    |                      |

# +--|----------------------|------------------+

# |  |                      |                  |

# |  + $ul32.111 (vlan)     + $ul32.222 (vlan) |

# |  | 192.0.2.146/28       | 192.0.2.162/28   |

# |  |                      |                  |

# |  \______________________/                  |

# |                   |                        |

# |                   |                        |

# |               $ul31 +                      |

# |      192.0.2.177/28 |                  SW3 |

# +---------------------|----------------------+

#                       |

# +---------------------|----------------------+

# |                     + $ul4                 |

# |                     ^ 192.0.2.178/28       |

# |                     |                      |

# |  + g2 (gre)         |                      |

# |    loc=192.0.2.66   |                      |

# |    rem=192.0.2.65 --'                      |

# |    tos=inherit                             |

# |                                            |

# |               $ol4 +                       |

# |   2001:db8:2::1/64 |                   SW4 |

# +--------------------|-----------------------+

#                      |

# +--------------------|---------+

# |                    |         |

# |                $h2 +         |

# |   2001:db8:2::2/64        H2 |

# +------------------------------+



ALL_TESTS="

	ping_ipv6

	multipath_ipv6

"



NUM_NETIFS=10

source lib.sh



h1_create()

{

	simple_if_init $h1 2001:db8:1::2/64

	ip -6 route add vrf v$h1 2001:db8:2::/64 via 2001:db8:1::1

}



h1_destroy()

{

	ip -6 route del vrf v$h1 2001:db8:2::/64 via 2001:db8:1::1

	simple_if_fini $h1 2001:db8:1::2/64

}



sw1_create()

{

	simple_if_init $ol1 2001:db8:1::1/64

	__simple_if_init $ul1 v$ol1 192.0.2.129/28



	tunnel_create g1 gre 192.0.2.65 192.0.2.66 tos inherit dev v$ol1

	__simple_if_init g1 v$ol1 192.0.2.65/32

	ip route add vrf v$ol1 192.0.2.66/32 via 192.0.2.130



	ip -6 route add vrf v$ol1 2001:db8:2::/64 dev g1

}



sw1_destroy()

{

	ip -6 route del vrf v$ol1 2001:db8:2::/64



	ip route del vrf v$ol1 192.0.2.66/32

	__simple_if_fini g1 192.0.2.65/32

	tunnel_destroy g1



	__simple_if_fini $ul1 192.0.2.129/28

	simple_if_fini $ol1 2001:db8:1::1/64

}



sw2_create()

{

	simple_if_init $ul21 192.0.2.130/28

	__simple_if_init $ul22 v$ul21

	vlan_create $ul22 111 v$ul21 192.0.2.145/28

	vlan_create $ul22 222 v$ul21 192.0.2.161/28



	ip route add vrf v$ul21 192.0.2.65/32 via 192.0.2.129

	ip route add vrf v$ul21 192.0.2.66/32 \

	   nexthop via 192.0.2.146 \

	   nexthop via 192.0.2.162

}



sw2_destroy()

{

	ip route del vrf v$ul21 192.0.2.66/32

	ip route del vrf v$ul21 192.0.2.65/32



	vlan_destroy $ul22 222

	vlan_destroy $ul22 111

	__simple_if_fini $ul22

	simple_if_fini $ul21 192.0.2.130/28

}



sw3_create()

{

	simple_if_init $ul31 192.0.2.177/28

	__simple_if_init $ul32 v$ul31

	vlan_create $ul32 111 v$ul31 192.0.2.146/28

	vlan_create $ul32 222 v$ul31 192.0.2.162/28



	ip route add vrf v$ul31 192.0.2.66/32 via 192.0.2.178

	ip route add vrf v$ul31 192.0.2.65/32 \

	   nexthop via 192.0.2.145 \

	   nexthop via 192.0.2.161



	tc qdisc add dev $ul32 clsact

	tc filter add dev $ul32 ingress pref 111 prot 802.1Q \

	   flower vlan_id 111 action pass

	tc filter add dev $ul32 ingress pref 222 prot 802.1Q \

	   flower vlan_id 222 action pass

}



sw3_destroy()

{

	tc qdisc del dev $ul32 clsact



	ip route del vrf v$ul31 192.0.2.65/32

	ip route del vrf v$ul31 192.0.2.66/32



	vlan_destroy $ul32 222

	vlan_destroy $ul32 111

	__simple_if_fini $ul32

	simple_if_fini $ul31 192.0.2.177/28

}



sw4_create()

{

	simple_if_init $ol4 2001:db8:2::1/64

	__simple_if_init $ul4 v$ol4 192.0.2.178/28



	tunnel_create g2 gre 192.0.2.66 192.0.2.65 tos inherit dev v$ol4

	__simple_if_init g2 v$ol4 192.0.2.66/32

	ip route add vrf v$ol4 192.0.2.65/32 via 192.0.2.177



	ip -6 route add vrf v$ol4 2001:db8:1::/64 dev g2

}



sw4_destroy()

{

	ip -6 route del vrf v$ol4 2001:db8:1::/64



	ip route del vrf v$ol4 192.0.2.65/32

	__simple_if_fini g2 192.0.2.66/32

	tunnel_destroy g2



	__simple_if_fini $ul4 192.0.2.178/28

	simple_if_fini $ol4 2001:db8:2::1/64

}



h2_create()

{

	simple_if_init $h2 2001:db8:2::2/64

	ip -6 route add vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1

}



h2_destroy()

{

	ip -6 route del vrf v$h2 2001:db8:1::/64 via 2001:db8:2::1

	simple_if_fini $h2 2001:db8:2::2/64

}



setup_prepare()

{

	h1=${NETIFS[p1]}



	ol1=${NETIFS[p2]}

	ul1=${NETIFS[p3]}



	ul21=${NETIFS[p4]}

	ul22=${NETIFS[p5]}



	ul32=${NETIFS[p6]}

	ul31=${NETIFS[p7]}



	ul4=${NETIFS[p8]}

	ol4=${NETIFS[p9]}



	h2=${NETIFS[p10]}



	vrf_prepare

	h1_create

	sw1_create

	sw2_create

	sw3_create

	sw4_create

	h2_create



	forwarding_enable

}



cleanup()

{

	pre_cleanup



	forwarding_restore



	h2_destroy

	sw4_destroy

	sw3_destroy

	sw2_destroy

	sw1_destroy

	h1_destroy

	vrf_cleanup

}



multipath6_test()

{

	local what=$1; shift

	local weight1=$1; shift

	local weight2=$1; shift



	sysctl_set net.ipv4.fib_multipath_hash_policy 2

	ip route replace vrf v$ul21 192.0.2.66/32 \

	   nexthop via 192.0.2.146 weight $weight1 \

	   nexthop via 192.0.2.162 weight $weight2



	local t0_111=$(tc_rule_stats_get $ul32 111 ingress)

	local t0_222=$(tc_rule_stats_get $ul32 222 ingress)



	ip vrf exec v$h1 \

	   $MZ $h1 -6 -q -p 64 -A "2001:db8:1::2-2001:db8:1::1e" \

	       -B "2001:db8:2::2-2001:db8:2::1e" \

	       -d 1msec -c 50 -t udp "sp=1024,dp=1024"

	sleep 1



	local t1_111=$(tc_rule_stats_get $ul32 111 ingress)

	local t1_222=$(tc_rule_stats_get $ul32 222 ingress)



	local d111=$((t1_111 - t0_111))

	local d222=$((t1_222 - t0_222))

	multipath_eval "$what" $weight1 $weight2 $d111 $d222



	ip route replace vrf v$ul21 192.0.2.66/32 \

	   nexthop via 192.0.2.146 \

	   nexthop via 192.0.2.162

	sysctl_restore net.ipv4.fib_multipath_hash_policy

}



ping_ipv6()

{

	ping_test $h1 2001:db8:2::2

}



multipath_ipv6()

{

	log_info "Running IPv6 over GRE over IPv4 multipath tests"

	multipath6_test "ECMP" 1 1

	multipath6_test "Weighted MP 2:1" 2 1

	multipath6_test "Weighted MP 11:45" 11 45

}



trap cleanup EXIT



setup_prepare

setup_wait

tests_run



exit $EXIT_STATUS

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