#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# Test for DSCP prioritization in the router.
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#
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# With ip_forward_update_priority disabled, the packets are expected to keep
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# their DSCP (which in this test uses only values 0..7) intact as they are
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# forwarded by the switch. That is verified at $h2. ICMP responses are formed
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# with the same DSCP as the requests, and likewise pass through the switch
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# intact, which is verified at $h1.
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#
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# With ip_forward_update_priority enabled, router reprioritizes the packets
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# according to the table in reprioritize(). Thus, say, DSCP 7 maps to priority
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# 4, which on egress maps back to DSCP 4. The response packet then gets
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# reprioritized to 6, getting DSCP 6 on egress.
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#
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# +----------------------+ +----------------------+
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# | H1 | | H2 |
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# | + $h1 | | $h2 + |
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# | | 192.0.2.1/28 | | 192.0.2.18/28 | |
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# +----|-----------------+ +----------------|-----+
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# | |
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# +----|----------------------------------------------------------------|-----+
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# | SW | | |
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# | + $swp1 $swp2 + |
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# | 192.0.2.2/28 192.0.2.17/28 |
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# | APP=0,5,0 .. 7,5,7 APP=0,5,0 .. 7,5,7 |
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# +---------------------------------------------------------------------------+
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ALL_TESTS="
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ping_ipv4
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test_update
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test_no_update
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"
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lib_dir=$(dirname $0)/../../../net/forwarding
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NUM_NETIFS=4
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source $lib_dir/lib.sh
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reprioritize()
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{
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local in=$1; shift
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# This is based on rt_tos2priority in include/net/route.h. Assuming 1:1
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# mapping between priorities and TOS, it yields a new priority for a
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# packet with ingress priority of $in.
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local -a reprio=(0 0 2 2 6 6 4 4)
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echo ${reprio[$in]}
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}
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h1_create()
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{
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local dscp;
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simple_if_init $h1 192.0.2.1/28
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tc qdisc add dev $h1 clsact
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dscp_capture_install $h1 0
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ip route add vrf v$h1 192.0.2.16/28 via 192.0.2.2
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}
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h1_destroy()
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{
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ip route del vrf v$h1 192.0.2.16/28 via 192.0.2.2
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dscp_capture_uninstall $h1 0
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tc qdisc del dev $h1 clsact
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simple_if_fini $h1 192.0.2.1/28
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}
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h2_create()
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{
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simple_if_init $h2 192.0.2.18/28
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tc qdisc add dev $h2 clsact
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dscp_capture_install $h2 0
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ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.17
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}
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h2_destroy()
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{
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ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.17
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dscp_capture_uninstall $h2 0
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tc qdisc del dev $h2 clsact
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simple_if_fini $h2 192.0.2.18/28
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}
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dscp_map()
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{
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local base=$1; shift
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for prio in {0..7}; do
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echo app=$prio,5,$((base + prio))
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done
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}
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switch_create()
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{
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simple_if_init $swp1 192.0.2.2/28
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__simple_if_init $swp2 v$swp1 192.0.2.17/28
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lldptool -T -i $swp1 -V APP $(dscp_map 0) >/dev/null
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lldptool -T -i $swp2 -V APP $(dscp_map 0) >/dev/null
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lldpad_app_wait_set $swp1
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lldpad_app_wait_set $swp2
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}
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switch_destroy()
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{
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lldptool -T -i $swp2 -V APP -d $(dscp_map 0) >/dev/null
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lldptool -T -i $swp1 -V APP -d $(dscp_map 0) >/dev/null
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lldpad_app_wait_del
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__simple_if_fini $swp2 192.0.2.17/28
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simple_if_fini $swp1 192.0.2.2/28
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}
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setup_prepare()
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{
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h1=${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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sysctl_set net.ipv4.ip_forward_update_priority 1
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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.ipv4.ip_forward_update_priority
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vrf_cleanup
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}
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ping_ipv4()
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{
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ping_test $h1 192.0.2.18
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}
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dscp_ping_test()
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{
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local vrf_name=$1; shift
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local sip=$1; shift
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local dip=$1; shift
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local prio=$1; shift
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local reprio=$1; shift
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local dev1=$1; shift
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local dev2=$1; shift
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local prio2=$($reprio $prio) # ICMP Request egress prio
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local prio3=$($reprio $prio2) # ICMP Response egress prio
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local dscp=$((prio << 2)) # ICMP Request ingress DSCP
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local dscp2=$((prio2 << 2)) # ICMP Request egress DSCP
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local dscp3=$((prio3 << 2)) # ICMP Response egress DSCP
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RET=0
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eval "local -A dev1_t0s=($(dscp_fetch_stats $dev1 0))"
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eval "local -A dev2_t0s=($(dscp_fetch_stats $dev2 0))"
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ip vrf exec $vrf_name \
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${PING} -Q $dscp ${sip:+-I $sip} $dip \
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-c 10 -i 0.1 -w 2 &> /dev/null
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eval "local -A dev1_t1s=($(dscp_fetch_stats $dev1 0))"
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eval "local -A dev2_t1s=($(dscp_fetch_stats $dev2 0))"
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for i in {0..7}; do
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local dscpi=$((i << 2))
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local expect2=0
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local expect3=0
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if ((i == prio2)); then
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expect2=10
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fi
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if ((i == prio3)); then
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expect3=10
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fi
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local delta=$((dev2_t1s[$i] - dev2_t0s[$i]))
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((expect2 == delta))
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check_err $? "DSCP $dscpi@$dev2: Expected to capture $expect2 packets, got $delta."
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delta=$((dev1_t1s[$i] - dev1_t0s[$i]))
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((expect3 == delta))
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check_err $? "DSCP $dscpi@$dev1: Expected to capture $expect3 packets, got $delta."
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done
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log_test "DSCP rewrite: $dscp-(prio $prio2)-$dscp2-(prio $prio3)-$dscp3"
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}
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__test_update()
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{
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local update=$1; shift
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local reprio=$1; shift
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sysctl_restore net.ipv4.ip_forward_update_priority
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sysctl_set net.ipv4.ip_forward_update_priority $update
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for prio in {0..7}; do
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dscp_ping_test v$h1 192.0.2.1 192.0.2.18 $prio $reprio $h1 $h2
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done
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}
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test_update()
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{
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__test_update 1 reprioritize
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}
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test_no_update()
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{
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__test_update 0 echo
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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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