#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Test a "one-armed router" [1] scenario. Packets forwarded between H1 and H2
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# should be forwarded by the ASIC, but also trapped so that ICMP redirect
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# packets could be potentially generated.
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#
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# 1. https://en.wikipedia.org/wiki/One-armed_router
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#
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# +---------------------------------+
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# | H1 (vrf) |
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# | + $h1 |
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# | | 192.0.2.1/24 |
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# | | 2001:db8:1::1/64 |
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# | | |
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# | | default via 192.0.2.2 |
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# | | default via 2001:db8:1::2 |
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# +----|----------------------------+
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# |
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# +----|----------------------------------------------------------------------+
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# | SW | |
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# | +--|--------------------------------------------------------------------+ |
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# | | + $swp1 BR0 (802.1d) | |
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# | | | |
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# | | 192.0.2.2/24 | |
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# | | 2001:db8:1::2/64 | |
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# | | 198.51.100.2/24 | |
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# | | 2001:db8:2::2/64 | |
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# | | | |
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# | | + $swp2 | |
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# | +--|--------------------------------------------------------------------+ |
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# | | |
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# +----|----------------------------------------------------------------------+
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# |
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# +----|----------------------------+
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# | | default via 198.51.100.2 |
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# | | default via 2001:db8:2::2 |
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# | | |
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# | | 2001:db8:2::1/64 |
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# | | 198.51.100.1/24 |
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# | + $h2 |
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# | H2 (vrf) |
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# +---------------------------------+
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lib_dir=$(dirname $0)/../../../net/forwarding
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ALL_TESTS="ping_ipv4 ping_ipv6 fwd_mark_ipv4 fwd_mark_ipv6"
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NUM_NETIFS=4
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source $lib_dir/tc_common.sh
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source $lib_dir/lib.sh
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h1_create()
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{
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simple_if_init $h1 192.0.2.1/24 2001:db8:1::1/64
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ip -4 route add default vrf v$h1 nexthop via 192.0.2.2
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ip -6 route add default vrf v$h1 nexthop via 2001:db8:1::2
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}
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h1_destroy()
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{
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ip -6 route del default vrf v$h1 nexthop via 2001:db8:1::2
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ip -4 route del default vrf v$h1 nexthop via 192.0.2.2
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simple_if_fini $h1 192.0.2.1/24 2001:db8:1::1/64
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}
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h2_create()
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{
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simple_if_init $h2 198.51.100.1/24 2001:db8:2::1/64
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ip -4 route add default vrf v$h2 nexthop via 198.51.100.2
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ip -6 route add default vrf v$h2 nexthop via 2001:db8:2::2
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}
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h2_destroy()
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{
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ip -6 route del default vrf v$h2 nexthop via 2001:db8:2::2
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ip -4 route del default vrf v$h2 nexthop via 198.51.100.2
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simple_if_fini $h2 198.51.100.1/24 2001:db8:2::1/64
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}
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switch_create()
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{
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ip link add name br0 type bridge mcast_snooping 0
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ip link set dev br0 up
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ip link set dev $swp1 master br0
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ip link set dev $swp1 up
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ip link set dev $swp2 master br0
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ip link set dev $swp2 up
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tc qdisc add dev $swp1 clsact
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tc qdisc add dev $swp2 clsact
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__addr_add_del br0 add 192.0.2.2/24 2001:db8:1::2/64
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__addr_add_del br0 add 198.51.100.2/24 2001:db8:2::2/64
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}
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switch_destroy()
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{
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__addr_add_del br0 del 198.51.100.2/24 2001:db8:2::2/64
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__addr_add_del br0 del 192.0.2.2/24 2001:db8:1::2/64
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tc qdisc del dev $swp2 clsact
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tc qdisc del dev $swp1 clsact
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ip link set dev $swp2 down
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ip link set dev $swp2 nomaster
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ip link set dev $swp1 down
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ip link set dev $swp1 nomaster
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ip link set dev br0 down
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ip link del dev br0
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}
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ping_ipv4()
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{
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ping_test $h1 198.51.100.1 ": h1->h2"
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}
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ping_ipv6()
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{
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ping6_test $h1 2001:db8:2::1 ": h1->h2"
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}
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fwd_mark_ipv4()
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{
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# Transmit packets from H1 to H2 and make sure they are trapped at
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# swp1 due to loopback error, but only forwarded by the ASIC through
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# swp2
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tc filter add dev $swp1 ingress protocol ip pref 1 handle 101 flower \
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skip_hw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \
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action pass
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tc filter add dev $swp2 egress protocol ip pref 1 handle 101 flower \
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skip_hw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \
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action pass
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tc filter add dev $swp2 egress protocol ip pref 2 handle 102 flower \
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skip_sw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \
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action pass
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ip vrf exec v$h1 $MZ $h1 -c 10 -d 100msec -p 64 -A 192.0.2.1 \
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-B 198.51.100.1 -t udp dp=52768,sp=42768 -q
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RET=0
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tc_check_packets "dev $swp1 ingress" 101 10
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check_err $?
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log_test "fwd mark: trapping IPv4 packets due to LBERROR"
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RET=0
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tc_check_packets "dev $swp2 egress" 101 0
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check_err $?
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log_test "fwd mark: forwarding IPv4 packets in software"
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RET=0
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tc_check_packets "dev $swp2 egress" 102 10
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check_err $?
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log_test "fwd mark: forwarding IPv4 packets in hardware"
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tc filter del dev $swp2 egress protocol ip pref 2 handle 102 flower
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tc filter del dev $swp2 egress protocol ip pref 1 handle 101 flower
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tc filter del dev $swp1 ingress protocol ip pref 1 handle 101 flower
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}
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fwd_mark_ipv6()
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{
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tc filter add dev $swp1 ingress protocol ipv6 pref 1 handle 101 flower \
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skip_hw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \
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action pass
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tc filter add dev $swp2 egress protocol ipv6 pref 1 handle 101 flower \
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skip_hw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \
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action pass
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tc filter add dev $swp2 egress protocol ipv6 pref 2 handle 102 flower \
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skip_sw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \
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action pass
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ip vrf exec v$h1 $MZ $h1 -6 -c 10 -d 100msec -p 64 -A 2001:db8:1::1 \
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-B 2001:db8:2::1 -t udp dp=52768,sp=42768 -q
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RET=0
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tc_check_packets "dev $swp1 ingress" 101 10
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check_err $?
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log_test "fwd mark: trapping IPv6 packets due to LBERROR"
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RET=0
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tc_check_packets "dev $swp2 egress" 101 0
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check_err $?
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log_test "fwd mark: forwarding IPv6 packets in software"
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RET=0
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tc_check_packets "dev $swp2 egress" 102 10
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check_err $?
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log_test "fwd mark: forwarding IPv6 packets in hardware"
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tc filter del dev $swp2 egress protocol ipv6 pref 2 handle 102 flower
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tc filter del dev $swp2 egress protocol ipv6 pref 1 handle 101 flower
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tc filter del dev $swp1 ingress protocol ipv6 pref 1 handle 101 flower
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}
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setup_prepare()
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{
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h1=${NETIFS[p1]}
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swp1=${NETIFS[p2]}
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swp2=${NETIFS[p3]}
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h2=${NETIFS[p4]}
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vrf_prepare
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forwarding_enable
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sysctl_set net.ipv4.conf.all.accept_redirects 0
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sysctl_set net.ipv6.conf.all.accept_redirects 0
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h1_create
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h2_create
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switch_create
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}
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cleanup()
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{
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pre_cleanup
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switch_destroy
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h2_destroy
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h1_destroy
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sysctl_restore net.ipv6.conf.all.accept_redirects
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sysctl_restore net.ipv4.conf.all.accept_redirects
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forwarding_restore
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vrf_cleanup
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}
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trap cleanup EXIT
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setup_prepare
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setup_wait
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tests_run
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exit $EXIT_STATUS
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