#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Test devlink-trap L3 exceptions functionality over mlxsw.
# Check all exception traps to make sure they are triggered under the right
# conditions.
# +---------------------------------+
# | H1 (vrf) |
# | + $h1 |
# | | 192.0.2.1/24 |
# | | 2001:db8:1::1/64 |
# | | |
# | | default via 192.0.2.2 |
# | | default via 2001:db8:1::2 |
# +----|----------------------------+
# |
# +----|----------------------------------------------------------------------+
# | SW | |
# | + $rp1 |
# | 192.0.2.2/24 |
# | 2001:db8:1::2/64 |
# | |
# | 2001:db8:2::2/64 |
# | 198.51.100.2/24 |
# | + $rp2 |
# | | |
# +----|----------------------------------------------------------------------+
# |
# +----|----------------------------+
# | | default via 198.51.100.2 |
# | | default via 2001:db8:2::2 |
# | | |
# | | 2001:db8:2::1/64 |
# | | 198.51.100.1/24 |
# | + $h2 |
# | H2 (vrf) |
# +---------------------------------+
lib_dir=$(dirname $0)/../../../net/forwarding
ALL_TESTS="
mtu_value_is_too_small_test
ttl_value_is_too_small_test
mc_reverse_path_forwarding_test
reject_route_test
unresolved_neigh_test
ipv4_lpm_miss_test
ipv6_lpm_miss_test
"
NUM_NETIFS=4
source $lib_dir/lib.sh
source $lib_dir/tc_common.sh
source $lib_dir/devlink_lib.sh
require_command $MCD
require_command $MC_CLI
table_name=selftests
h1_create()
{
simple_if_init $h1 192.0.2.1/24 2001:db8:1::1/64
ip -4 route add default vrf v$h1 nexthop via 192.0.2.2
ip -6 route add default vrf v$h1 nexthop via 2001:db8:1::2
tc qdisc add dev $h1 clsact
}
h1_destroy()
{
tc qdisc del dev $h1 clsact
ip -6 route del default vrf v$h1 nexthop via 2001:db8:1::2
ip -4 route del default vrf v$h1 nexthop via 192.0.2.2
simple_if_fini $h1 192.0.2.1/24 2001:db8:1::1/64
}
h2_create()
{
simple_if_init $h2 198.51.100.1/24 2001:db8:2::1/64
ip -4 route add default vrf v$h2 nexthop via 198.51.100.2
ip -6 route add default vrf v$h2 nexthop via 2001:db8:2::2
}
h2_destroy()
{
ip -6 route del default vrf v$h2 nexthop via 2001:db8:2::2
ip -4 route del default vrf v$h2 nexthop via 198.51.100.2
simple_if_fini $h2 198.51.100.1/24 2001:db8:2::1/64
}
router_create()
{
ip link set dev $rp1 up
ip link set dev $rp2 up
tc qdisc add dev $rp2 clsact
__addr_add_del $rp1 add 192.0.2.2/24 2001:db8:1::2/64
__addr_add_del $rp2 add 198.51.100.2/24 2001:db8:2::2/64
}
router_destroy()
{
__addr_add_del $rp2 del 198.51.100.2/24 2001:db8:2::2/64
__addr_add_del $rp1 del 192.0.2.2/24 2001:db8:1::2/64
tc qdisc del dev $rp2 clsact
ip link set dev $rp2 down
ip link set dev $rp1 down
}
setup_prepare()
{
h1=${NETIFS[p1]}
rp1=${NETIFS[p2]}
rp2=${NETIFS[p3]}
h2=${NETIFS[p4]}
rp1mac=$(mac_get $rp1)
start_mcd
vrf_prepare
forwarding_enable
h1_create
h2_create
router_create
}
cleanup()
{
pre_cleanup
router_destroy
h2_destroy
h1_destroy
forwarding_restore
vrf_cleanup
kill_mcd
}
ping_check()
{
ping_do $h1 198.51.100.1
check_err $? "Packets that should not be trapped were trapped"
}
trap_action_check()
{
local trap_name=$1; shift
local expected_action=$1; shift
action=$(devlink_trap_action_get $trap_name)
if [ "$action" != $expected_action ]; then
check_err 1 "Trap $trap_name has wrong action: $action"
fi
}
mtu_value_is_too_small_test()
{
local trap_name="mtu_value_is_too_small"
local expected_action="trap"
local mz_pid
RET=0
ping_check $trap_name
trap_action_check $trap_name $expected_action
# type - Destination Unreachable
# code - Fragmentation Needed and Don't Fragment was Set
tc filter add dev $h1 ingress protocol ip pref 1 handle 101 \
flower skip_hw ip_proto icmp type 3 code 4 action pass
mtu_set $rp2 1300
# Generate IP packets bigger than router's MTU with don't fragment
# flag on.
$MZ $h1 -t udp "sp=54321,dp=12345,df" -p 1400 -c 0 -d 1msec -b $rp1mac \
-B 198.51.100.1 -q &
mz_pid=$!
devlink_trap_exception_test $trap_name
tc_check_packets_hitting "dev $h1 ingress" 101
check_err $? "Packets were not received to h1"
log_test "MTU value is too small"
mtu_restore $rp2
kill $mz_pid && wait $mz_pid &> /dev/null
tc filter del dev $h1 ingress protocol ip pref 1 handle 101 flower
}
__ttl_value_is_too_small_test()
{
local ttl_val=$1; shift
local trap_name="ttl_value_is_too_small"
local expected_action="trap"
local mz_pid
RET=0
ping_check $trap_name
trap_action_check $trap_name $expected_action
# type - Time Exceeded
# code - Time to Live exceeded in Transit
tc filter add dev $h1 ingress protocol ip pref 1 handle 101 \
flower skip_hw ip_proto icmp type 11 code 0 action pass
# Generate IP packets with small TTL
$MZ $h1 -t udp "ttl=$ttl_val,sp=54321,dp=12345" -c 0 -d 1msec \
-b $rp1mac -B 198.51.100.1 -q &
mz_pid=$!
devlink_trap_exception_test $trap_name
tc_check_packets_hitting "dev $h1 ingress" 101
check_err $? "Packets were not received to h1"
log_test "TTL value is too small: TTL=$ttl_val"
kill $mz_pid && wait $mz_pid &> /dev/null
tc filter del dev $h1 ingress protocol ip pref 1 handle 101 flower
}
ttl_value_is_too_small_test()
{
__ttl_value_is_too_small_test 0
__ttl_value_is_too_small_test 1
}
start_mcd()
{
SMCROUTEDIR="$(mktemp -d)"
for ((i = 1; i <= $NUM_NETIFS; ++i)); do
echo "phyint ${NETIFS[p$i]} enable" >> \
$SMCROUTEDIR/$table_name.conf
done
$MCD -N -I $table_name -f $SMCROUTEDIR/$table_name.conf \
-P $SMCROUTEDIR/$table_name.pid
}
kill_mcd()
{
pkill $MCD
rm -rf $SMCROUTEDIR
}
__mc_reverse_path_forwarding_test()
{
local desc=$1; shift
local src_ip=$1; shift
local dst_ip=$1; shift
local dst_mac=$1; shift
local proto=$1; shift
local flags=${1:-""}; shift
local trap_name="mc_reverse_path_forwarding"
local expected_action="trap"
local mz_pid
RET=0
ping_check $trap_name
trap_action_check $trap_name $expected_action
tc filter add dev $rp2 egress protocol $proto pref 1 handle 101 \
flower dst_ip $dst_ip ip_proto udp action drop
$MC_CLI -I $table_name add $rp1 $src_ip $dst_ip $rp2
# Generate packets to multicast address.
$MZ $h2 $flags -t udp "sp=54321,dp=12345" -c 0 -p 128 \
-a 00:11:22:33:44:55 -b $dst_mac \
-A $src_ip -B $dst_ip -q &
mz_pid=$!
devlink_trap_exception_test $trap_name
tc_check_packets "dev $rp2 egress" 101 0
check_err $? "Packets were not dropped"
log_test "Multicast reverse path forwarding: $desc"
kill $mz_pid && wait $mz_pid &> /dev/null
tc filter del dev $rp2 egress protocol $proto pref 1 handle 101 flower
}
mc_reverse_path_forwarding_test()
{
__mc_reverse_path_forwarding_test "IPv4" "192.0.2.1" "225.1.2.3" \
"01:00:5e:01:02:03" "ip"
__mc_reverse_path_forwarding_test "IPv6" "2001:db8:1::1" "ff0e::3" \
"33:33:00:00:00:03" "ipv6" "-6"
}
__reject_route_test()
{
local desc=$1; shift
local dst_ip=$1; shift
local proto=$1; shift
local ip_proto=$1; shift
local type=$1; shift
local code=$1; shift
local unreachable=$1; shift
local flags=${1:-""}; shift
local trap_name="reject_route"
local expected_action="trap"
local mz_pid
RET=0
ping_check $trap_name
trap_action_check $trap_name $expected_action
tc filter add dev $h1 ingress protocol $proto pref 1 handle 101 flower \
skip_hw ip_proto $ip_proto type $type code $code action pass
ip route add unreachable $unreachable
# Generate pacekts to h2. The destination IP is unreachable.
$MZ $flags $h1 -t udp "sp=54321,dp=12345" -c 0 -d 1msec -b $rp1mac \
-B $dst_ip -q &
mz_pid=$!
devlink_trap_exception_test $trap_name
tc_check_packets_hitting "dev $h1 ingress" 101
check_err $? "ICMP packet was not received to h1"
log_test "Reject route: $desc"
kill $mz_pid && wait $mz_pid &> /dev/null
ip route del unreachable $unreachable
tc filter del dev $h1 ingress protocol $proto pref 1 handle 101 flower
}
reject_route_test()
{
# type - Destination Unreachable
# code - Host Unreachable
__reject_route_test "IPv4" 198.51.100.1 "ip" "icmp" 3 1 \
"198.51.100.0/26"
# type - Destination Unreachable
# code - No Route
__reject_route_test "IPv6" 2001:db8:2::1 "ipv6" "icmpv6" 1 0 \
"2001:db8:2::0/66" "-6"
}
__host_miss_test()
{
local desc=$1; shift
local dip=$1; shift
local trap_name="unresolved_neigh"
local expected_action="trap"
local mz_pid
RET=0
ping_check $trap_name
trap_action_check $trap_name $expected_action
ip neigh flush dev $rp2
t0_packets=$(devlink_trap_rx_packets_get $trap_name)
# Generate packets to h2 (will incur a unresolved neighbor).
# The ping should pass and devlink counters should be increased.
ping_do $h1 $dip
check_err $? "ping failed: $desc"
t1_packets=$(devlink_trap_rx_packets_get $trap_name)
if [[ $t0_packets -eq $t1_packets ]]; then
check_err 1 "Trap counter did not increase"
fi
log_test "Unresolved neigh: host miss: $desc"
}
__invalid_nexthop_test()
{
local desc=$1; shift
local dip=$1; shift
local extra_add=$1; shift
local subnet=$1; shift
local via_add=$1; shift
local trap_name="unresolved_neigh"
local expected_action="trap"
local mz_pid
RET=0
ping_check $trap_name
trap_action_check $trap_name $expected_action
ip address add $extra_add/$subnet dev $h2
# Check that correct route does not trigger unresolved_neigh
ip $flags route add $dip via $extra_add dev $rp2
# Generate packets in order to discover all neighbours.
# Without it, counters of unresolved_neigh will be increased
# during neighbours discovery and the check below will fail
# for a wrong reason
ping_do $h1 $dip
t0_packets=$(devlink_trap_rx_packets_get $trap_name)
ping_do $h1 $dip
t1_packets=$(devlink_trap_rx_packets_get $trap_name)
if [[ $t0_packets -ne $t1_packets ]]; then
check_err 1 "Trap counter increased when it should not"
fi
ip $flags route del $dip via $extra_add dev $rp2
# Check that route to nexthop that does not exist trigger
# unresolved_neigh
ip $flags route add $dip via $via_add dev $h2
t0_packets=$(devlink_trap_rx_packets_get $trap_name)
ping_do $h1 $dip
t1_packets=$(devlink_trap_rx_packets_get $trap_name)
if [[ $t0_packets -eq $t1_packets ]]; then
check_err 1 "Trap counter did not increase"
fi
ip $flags route del $dip via $via_add dev $h2
ip address del $extra_add/$subnet dev $h2
log_test "Unresolved neigh: nexthop does not exist: $desc"
}
__invalid_nexthop_bucket_test()
{
local desc=$1; shift
local dip=$1; shift
local via_add=$1; shift
local trap_name="unresolved_neigh"
RET=0
# Check that route to nexthop that does not exist triggers
# unresolved_neigh
ip nexthop add id 1 via $via_add dev $rp2
ip nexthop add id 10 group 1 type resilient buckets 32
ip route add $dip nhid 10
t0_packets=$(devlink_trap_rx_packets_get $trap_name)
ping_do $h1 $dip
t1_packets=$(devlink_trap_rx_packets_get $trap_name)
if [[ $t0_packets -eq $t1_packets ]]; then
check_err 1 "Trap counter did not increase"
fi
ip route del $dip nhid 10
ip nexthop del id 10
ip nexthop del id 1
log_test "Unresolved neigh: nexthop bucket does not exist: $desc"
}
unresolved_neigh_test()
{
__host_miss_test "IPv4" 198.51.100.1
__host_miss_test "IPv6" 2001:db8:2::1
__invalid_nexthop_test "IPv4" 198.51.100.1 198.51.100.3 24 198.51.100.4
__invalid_nexthop_test "IPv6" 2001:db8:2::1 2001:db8:2::3 64 \
2001:db8:2::4
__invalid_nexthop_bucket_test "IPv4" 198.51.100.1 198.51.100.4
__invalid_nexthop_bucket_test "IPv6" 2001:db8:2::1 2001:db8:2::4
}
vrf_without_routes_create()
{
# VRF creating makes the links to be down and then up again.
# By default, IPv6 address is not saved after link becomes down.
# Save IPv6 address using sysctl configuration.
sysctl_set net.ipv6.conf.$rp1.keep_addr_on_down 1
sysctl_set net.ipv6.conf.$rp2.keep_addr_on_down 1
ip link add dev vrf1 type vrf table 101
ip link set dev $rp1 master vrf1
ip link set dev $rp2 master vrf1
ip link set dev vrf1 up
# Wait for rp1 and rp2 to be up
setup_wait
}
vrf_without_routes_destroy()
{
ip link set dev $rp1 nomaster
ip link set dev $rp2 nomaster
ip link del dev vrf1
sysctl_restore net.ipv6.conf.$rp2.keep_addr_on_down
sysctl_restore net.ipv6.conf.$rp1.keep_addr_on_down
# Wait for interfaces to be up
setup_wait
}
ipv4_lpm_miss_test()
{
local trap_name="ipv4_lpm_miss"
local expected_action="trap"
local mz_pid
RET=0
ping_check $trap_name
trap_action_check $trap_name $expected_action
# Create a VRF without a default route
vrf_without_routes_create
# Generate packets through a VRF without a matching route.
$MZ $h1 -t udp "sp=54321,dp=12345" -c 0 -d 1msec -b $rp1mac \
-B 203.0.113.1 -q &
mz_pid=$!
devlink_trap_exception_test $trap_name
log_test "LPM miss: IPv4"
kill $mz_pid && wait $mz_pid &> /dev/null
vrf_without_routes_destroy
}
ipv6_lpm_miss_test()
{
local trap_name="ipv6_lpm_miss"
local expected_action="trap"
local mz_pid
RET=0
ping_check $trap_name
trap_action_check $trap_name $expected_action
# Create a VRF without a default route
vrf_without_routes_create
# Generate packets through a VRF without a matching route.
$MZ -6 $h1 -t udp "sp=54321,dp=12345" -c 0 -d 1msec -b $rp1mac \
-B 2001:db8::1 -q &
mz_pid=$!
devlink_trap_exception_test $trap_name
log_test "LPM miss: IPv6"
kill $mz_pid && wait $mz_pid &> /dev/null
vrf_without_routes_destroy
}
trap cleanup EXIT
setup_prepare
setup_wait
tests_run
exit $EXIT_STATUS
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