1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3 4# Test for DSCP prioritization in the router. 5# 6# With ip_forward_update_priority disabled, the packets are expected to keep 7# their DSCP (which in this test uses only values 0..7) intact as they are 8# forwarded by the switch. That is verified at $h2. ICMP responses are formed 9# with the same DSCP as the requests, and likewise pass through the switch 10# intact, which is verified at $h1. 11# 12# With ip_forward_update_priority enabled, router reprioritizes the packets 13# according to the table in reprioritize(). Thus, say, DSCP 7 maps to priority 14# 4, which on egress maps back to DSCP 4. The response packet then gets 15# reprioritized to 6, getting DSCP 6 on egress. 16# 17# +----------------------+ +----------------------+ 18# | H1 | | H2 | 19# | + $h1 | | $h2 + | 20# | | 192.0.2.1/28 | | 192.0.2.18/28 | | 21# +----|-----------------+ +----------------|-----+ 22# | | 23# +----|----------------------------------------------------------------|-----+ 24# | SW | | | 25# | + $swp1 $swp2 + | 26# | 192.0.2.2/28 192.0.2.17/28 | 27# | APP=0,5,0 .. 7,5,7 APP=0,5,0 .. 7,5,7 | 28# +---------------------------------------------------------------------------+ 29 30ALL_TESTS=" 31 ping_ipv4 32 test_update 33 test_no_update 34" 35 36lib_dir=$(dirname $0)/../../../net/forwarding 37 38NUM_NETIFS=4 39source $lib_dir/lib.sh 40 41reprioritize() 42{ 43 local in=$1; shift 44 45 # This is based on rt_tos2priority in include/net/route.h. Assuming 1:1 46 # mapping between priorities and TOS, it yields a new priority for a 47 # packet with ingress priority of $in. 48 local -a reprio=(0 0 2 2 6 6 4 4) 49 50 echo ${reprio[$in]} 51} 52 53h1_create() 54{ 55 local dscp; 56 57 simple_if_init $h1 192.0.2.1/28 58 tc qdisc add dev $h1 clsact 59 dscp_capture_install $h1 0 60 ip route add vrf v$h1 192.0.2.16/28 via 192.0.2.2 61} 62 63h1_destroy() 64{ 65 ip route del vrf v$h1 192.0.2.16/28 via 192.0.2.2 66 dscp_capture_uninstall $h1 0 67 tc qdisc del dev $h1 clsact 68 simple_if_fini $h1 192.0.2.1/28 69} 70 71h2_create() 72{ 73 simple_if_init $h2 192.0.2.18/28 74 tc qdisc add dev $h2 clsact 75 dscp_capture_install $h2 0 76 ip route add vrf v$h2 192.0.2.0/28 via 192.0.2.17 77} 78 79h2_destroy() 80{ 81 ip route del vrf v$h2 192.0.2.0/28 via 192.0.2.17 82 dscp_capture_uninstall $h2 0 83 tc qdisc del dev $h2 clsact 84 simple_if_fini $h2 192.0.2.18/28 85} 86 87dscp_map() 88{ 89 local base=$1; shift 90 91 for prio in {0..7}; do 92 echo app=$prio,5,$((base + prio)) 93 done 94} 95 96switch_create() 97{ 98 simple_if_init $swp1 192.0.2.2/28 99 __simple_if_init $swp2 v$swp1 192.0.2.17/28 100 101 lldptool -T -i $swp1 -V APP $(dscp_map 0) >/dev/null 102 lldptool -T -i $swp2 -V APP $(dscp_map 0) >/dev/null 103 lldpad_app_wait_set $swp1 104 lldpad_app_wait_set $swp2 105} 106 107switch_destroy() 108{ 109 lldptool -T -i $swp2 -V APP -d $(dscp_map 0) >/dev/null 110 lldptool -T -i $swp1 -V APP -d $(dscp_map 0) >/dev/null 111 lldpad_app_wait_del 112 113 __simple_if_fini $swp2 192.0.2.17/28 114 simple_if_fini $swp1 192.0.2.2/28 115} 116 117setup_prepare() 118{ 119 h1=${NETIFS[p1]} 120 swp1=${NETIFS[p2]} 121 122 swp2=${NETIFS[p3]} 123 h2=${NETIFS[p4]} 124 125 vrf_prepare 126 127 sysctl_set net.ipv4.ip_forward_update_priority 1 128 h1_create 129 h2_create 130 switch_create 131} 132 133cleanup() 134{ 135 pre_cleanup 136 137 switch_destroy 138 h2_destroy 139 h1_destroy 140 sysctl_restore net.ipv4.ip_forward_update_priority 141 142 vrf_cleanup 143} 144 145ping_ipv4() 146{ 147 ping_test $h1 192.0.2.18 148} 149 150dscp_ping_test() 151{ 152 local vrf_name=$1; shift 153 local sip=$1; shift 154 local dip=$1; shift 155 local prio=$1; shift 156 local reprio=$1; shift 157 local dev1=$1; shift 158 local dev2=$1; shift 159 160 local prio2=$($reprio $prio) # ICMP Request egress prio 161 local prio3=$($reprio $prio2) # ICMP Response egress prio 162 163 local dscp=$((prio << 2)) # ICMP Request ingress DSCP 164 local dscp2=$((prio2 << 2)) # ICMP Request egress DSCP 165 local dscp3=$((prio3 << 2)) # ICMP Response egress DSCP 166 167 RET=0 168 169 eval "local -A dev1_t0s=($(dscp_fetch_stats $dev1 0))" 170 eval "local -A dev2_t0s=($(dscp_fetch_stats $dev2 0))" 171 172 ip vrf exec $vrf_name \ 173 ${PING} -Q $dscp ${sip:+-I $sip} $dip \ 174 -c 10 -i 0.1 -w 2 &> /dev/null 175 176 eval "local -A dev1_t1s=($(dscp_fetch_stats $dev1 0))" 177 eval "local -A dev2_t1s=($(dscp_fetch_stats $dev2 0))" 178 179 for i in {0..7}; do 180 local dscpi=$((i << 2)) 181 local expect2=0 182 local expect3=0 183 184 if ((i == prio2)); then 185 expect2=10 186 fi 187 if ((i == prio3)); then 188 expect3=10 189 fi 190 191 local delta=$((dev2_t1s[$i] - dev2_t0s[$i])) 192 ((expect2 == delta)) 193 check_err $? "DSCP $dscpi@$dev2: Expected to capture $expect2 packets, got $delta." 194 195 delta=$((dev1_t1s[$i] - dev1_t0s[$i])) 196 ((expect3 == delta)) 197 check_err $? "DSCP $dscpi@$dev1: Expected to capture $expect3 packets, got $delta." 198 done 199 200 log_test "DSCP rewrite: $dscp-(prio $prio2)-$dscp2-(prio $prio3)-$dscp3" 201} 202 203__test_update() 204{ 205 local update=$1; shift 206 local reprio=$1; shift 207 208 sysctl_restore net.ipv4.ip_forward_update_priority 209 sysctl_set net.ipv4.ip_forward_update_priority $update 210 211 for prio in {0..7}; do 212 dscp_ping_test v$h1 192.0.2.1 192.0.2.18 $prio $reprio $h1 $h2 213 done 214} 215 216test_update() 217{ 218 __test_update 1 reprioritize 219} 220 221test_no_update() 222{ 223 __test_update 0 echo 224} 225 226trap cleanup EXIT 227 228setup_prepare 229setup_wait 230 231tests_run 232 233exit $EXIT_STATUS 234