| #!/bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # author: Andrea Mayer <andrea.mayer@uniroma2.it> |
| |
| # This test is designed for evaluating the new SRv6 End.DT4 behavior used for |
| # implementing IPv4 L3 VPN use cases. |
| # |
| # Hereafter a network diagram is shown, where two different tenants (named 100 |
| # and 200) offer IPv4 L3 VPN services allowing hosts to communicate with each |
| # other across an IPv6 network. |
| # |
| # Only hosts belonging to the same tenant (and to the same VPN) can communicate |
| # with each other. Instead, the communication among hosts of different tenants |
| # is forbidden. |
| # In other words, hosts hs-t100-1 and hs-t100-2 are connected through the IPv4 |
| # L3 VPN of tenant 100 while hs-t200-3 and hs-t200-4 are connected using the |
| # IPv4 L3 VPN of tenant 200. Cross connection between tenant 100 and tenant 200 |
| # is forbidden and thus, for example, hs-t100-1 cannot reach hs-t200-3 and vice |
| # versa. |
| # |
| # Routers rt-1 and rt-2 implement IPv4 L3 VPN services leveraging the SRv6 |
| # architecture. The key components for such VPNs are: a) SRv6 Encap behavior, |
| # b) SRv6 End.DT4 behavior and c) VRF. |
| # |
| # To explain how an IPv4 L3 VPN based on SRv6 works, let us briefly consider an |
| # example where, within the same domain of tenant 100, the host hs-t100-1 pings |
| # the host hs-t100-2. |
| # |
| # First of all, L2 reachability of the host hs-t100-2 is taken into account by |
| # the router rt-1 which acts as an arp proxy. |
| # |
| # When the host hs-t100-1 sends an IPv4 packet destined to hs-t100-2, the |
| # router rt-1 receives the packet on the internal veth-t100 interface. Such |
| # interface is enslaved to the VRF vrf-100 whose associated table contains the |
| # SRv6 Encap route for encapsulating any IPv4 packet in a IPv6 plus the Segment |
| # Routing Header (SRH) packet. This packet is sent through the (IPv6) core |
| # network up to the router rt-2 that receives it on veth0 interface. |
| # |
| # The rt-2 router uses the 'localsid' routing table to process incoming |
| # IPv6+SRH packets which belong to the VPN of the tenant 100. For each of these |
| # packets, the SRv6 End.DT4 behavior removes the outer IPv6+SRH headers and |
| # performs the lookup on the vrf-100 table using the destination address of |
| # the decapsulated IPv4 packet. Afterwards, the packet is sent to the host |
| # hs-t100-2 through the veth-t100 interface. |
| # |
| # The ping response follows the same processing but this time the role of rt-1 |
| # and rt-2 are swapped. |
| # |
| # Of course, the IPv4 L3 VPN for tenant 200 works exactly as the IPv4 L3 VPN |
| # for tenant 100. In this case, only hosts hs-t200-3 and hs-t200-4 are able to |
| # connect with each other. |
| # |
| # |
| # +-------------------+ +-------------------+ |
| # | | | | |
| # | hs-t100-1 netns | | hs-t100-2 netns | |
| # | | | | |
| # | +-------------+ | | +-------------+ | |
| # | | veth0 | | | | veth0 | | |
| # | | 10.0.0.1/24 | | | | 10.0.0.2/24 | | |
| # | +-------------+ | | +-------------+ | |
| # | . | | . | |
| # +-------------------+ +-------------------+ |
| # . . |
| # . . |
| # . . |
| # +-----------------------------------+ +-----------------------------------+ |
| # | . | | . | |
| # | +---------------+ | | +---------------- | |
| # | | veth-t100 | | | | veth-t100 | | |
| # | | 10.0.0.254/24 | +----------+ | | +----------+ | 10.0.0.254/24 | | |
| # | +-------+-------+ | localsid | | | | localsid | +-------+-------- | |
| # | | | table | | | | table | | | |
| # | +----+----+ +----------+ | | +----------+ +----+----+ | |
| # | | vrf-100 | | | | vrf-100 | | |
| # | +---------+ +------------+ | | +------------+ +---------+ | |
| # | | veth0 | | | | veth0 | | |
| # | | fd00::1/64 |.|...|.| fd00::2/64 | | |
| # | +---------+ +------------+ | | +------------+ +---------+ | |
| # | | vrf-200 | | | | vrf-200 | | |
| # | +----+----+ | | +----+----+ | |
| # | | | | | | |
| # | +-------+-------+ | | +-------+-------- | |
| # | | veth-t200 | | | | veth-t200 | | |
| # | | 10.0.0.254/24 | | | | 10.0.0.254/24 | | |
| # | +---------------+ rt-1 netns | | rt-2 netns +---------------- | |
| # | . | | . | |
| # +-----------------------------------+ +-----------------------------------+ |
| # . . |
| # . . |
| # . . |
| # . . |
| # +-------------------+ +-------------------+ |
| # | . | | . | |
| # | +-------------+ | | +-------------+ | |
| # | | veth0 | | | | veth0 | | |
| # | | 10.0.0.3/24 | | | | 10.0.0.4/24 | | |
| # | +-------------+ | | +-------------+ | |
| # | | | | |
| # | hs-t200-3 netns | | hs-t200-4 netns | |
| # | | | | |
| # +-------------------+ +-------------------+ |
| # |
| # |
| # ~~~~~~~~~~~~~~~~~~~~~~~~~ |
| # | Network configuration | |
| # ~~~~~~~~~~~~~~~~~~~~~~~~~ |
| # |
| # rt-1: localsid table (table 90) |
| # +-------------------------------------------------+ |
| # |SID |Action | |
| # +-------------------------------------------------+ |
| # |fc00:21:100::6004|apply SRv6 End.DT4 vrftable 100| |
| # +-------------------------------------------------+ |
| # |fc00:21:200::6004|apply SRv6 End.DT4 vrftable 200| |
| # +-------------------------------------------------+ |
| # |
| # rt-1: VRF tenant 100 (table 100) |
| # +---------------------------------------------------+ |
| # |host |Action | |
| # +---------------------------------------------------+ |
| # |10.0.0.2 |apply seg6 encap segs fc00:12:100::6004| |
| # +---------------------------------------------------+ |
| # |10.0.0.0/24|forward to dev veth_t100 | |
| # +---------------------------------------------------+ |
| # |
| # rt-1: VRF tenant 200 (table 200) |
| # +---------------------------------------------------+ |
| # |host |Action | |
| # +---------------------------------------------------+ |
| # |10.0.0.4 |apply seg6 encap segs fc00:12:200::6004| |
| # +---------------------------------------------------+ |
| # |10.0.0.0/24|forward to dev veth_t200 | |
| # +---------------------------------------------------+ |
| # |
| # |
| # rt-2: localsid table (table 90) |
| # +-------------------------------------------------+ |
| # |SID |Action | |
| # +-------------------------------------------------+ |
| # |fc00:12:100::6004|apply SRv6 End.DT4 vrftable 100| |
| # +-------------------------------------------------+ |
| # |fc00:12:200::6004|apply SRv6 End.DT4 vrftable 200| |
| # +-------------------------------------------------+ |
| # |
| # rt-2: VRF tenant 100 (table 100) |
| # +---------------------------------------------------+ |
| # |host |Action | |
| # +---------------------------------------------------+ |
| # |10.0.0.1 |apply seg6 encap segs fc00:21:100::6004| |
| # +---------------------------------------------------+ |
| # |10.0.0.0/24|forward to dev veth_t100 | |
| # +---------------------------------------------------+ |
| # |
| # rt-2: VRF tenant 200 (table 200) |
| # +---------------------------------------------------+ |
| # |host |Action | |
| # +---------------------------------------------------+ |
| # |10.0.0.3 |apply seg6 encap segs fc00:21:200::6004| |
| # +---------------------------------------------------+ |
| # |10.0.0.0/24|forward to dev veth_t200 | |
| # +---------------------------------------------------+ |
| # |
| |
| source lib.sh |
| |
| readonly LOCALSID_TABLE_ID=90 |
| readonly IPv6_RT_NETWORK=fd00 |
| readonly IPv4_HS_NETWORK=10.0.0 |
| readonly VPN_LOCATOR_SERVICE=fc00 |
| PING_TIMEOUT_SEC=4 |
| |
| ret=0 |
| |
| PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no} |
| |
| log_test() |
| { |
| local rc=$1 |
| local expected=$2 |
| local msg="$3" |
| |
| if [ ${rc} -eq ${expected} ]; then |
| nsuccess=$((nsuccess+1)) |
| printf "\n TEST: %-60s [ OK ]\n" "${msg}" |
| else |
| ret=1 |
| nfail=$((nfail+1)) |
| printf "\n TEST: %-60s [FAIL]\n" "${msg}" |
| if [ "${PAUSE_ON_FAIL}" = "yes" ]; then |
| echo |
| echo "hit enter to continue, 'q' to quit" |
| read a |
| [ "$a" = "q" ] && exit 1 |
| fi |
| fi |
| } |
| |
| print_log_test_results() |
| { |
| if [ "$TESTS" != "none" ]; then |
| printf "\nTests passed: %3d\n" ${nsuccess} |
| printf "Tests failed: %3d\n" ${nfail} |
| fi |
| } |
| |
| log_section() |
| { |
| echo |
| echo "################################################################################" |
| echo "TEST SECTION: $*" |
| echo "################################################################################" |
| } |
| |
| cleanup() |
| { |
| ip link del veth-rt-1 2>/dev/null || true |
| ip link del veth-rt-2 2>/dev/null || true |
| |
| cleanup_all_ns |
| } |
| |
| # Setup the basic networking for the routers |
| setup_rt_networking() |
| { |
| local id=$1 |
| eval local nsname=\${rt_${id}} |
| |
| ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0 |
| ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0 |
| |
| ip link set veth-rt-${id} netns ${nsname} |
| ip -netns ${nsname} link set veth-rt-${id} name veth0 |
| |
| ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${id}/64 dev veth0 nodad |
| ip -netns ${nsname} link set veth0 up |
| ip -netns ${nsname} link set lo up |
| |
| ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1 |
| ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1 |
| } |
| |
| setup_hs() |
| { |
| local hid=$1 |
| local rid=$2 |
| local tid=$3 |
| eval local hsname=\${hs_t${tid}_${hid}} |
| eval local rtname=\${rt_${rid}} |
| local rtveth=veth-t${tid} |
| |
| # disable the rp_filter otherwise the kernel gets confused about how |
| # to route decap ipv4 packets. |
| ip netns exec ${rtname} sysctl -wq net.ipv4.conf.all.rp_filter=0 |
| ip netns exec ${rtname} sysctl -wq net.ipv4.conf.default.rp_filter=0 |
| |
| ip -netns ${hsname} link add veth0 type veth peer name ${rtveth} |
| ip -netns ${hsname} link set ${rtveth} netns ${rtname} |
| ip -netns ${hsname} addr add ${IPv4_HS_NETWORK}.${hid}/24 dev veth0 |
| ip -netns ${hsname} link set veth0 up |
| ip -netns ${hsname} link set lo up |
| |
| # configure the VRF for the tenant X on the router which is directly |
| # connected to the source host. |
| ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid} |
| ip -netns ${rtname} link set vrf-${tid} up |
| |
| # enslave the veth-tX interface to the vrf-X in the access router |
| ip -netns ${rtname} link set ${rtveth} master vrf-${tid} |
| ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.254/24 dev ${rtveth} |
| ip -netns ${rtname} link set ${rtveth} up |
| |
| ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1 |
| |
| ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode" |
| } |
| |
| setup_vpn_config() |
| { |
| local hssrc=$1 |
| local rtsrc=$2 |
| local hsdst=$3 |
| local rtdst=$4 |
| local tid=$5 |
| |
| eval local rtsrc_name=\${rt_${rtsrc}} |
| eval local rtdst_name=\${rt_${rtdst}} |
| local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6004 |
| |
| # set the encap route for encapsulating packets which arrive from the |
| # host hssrc and destined to the access router rtsrc. |
| ip -netns ${rtsrc_name} -4 route add ${IPv4_HS_NETWORK}.${hsdst}/32 vrf vrf-${tid} \ |
| encap seg6 mode encap segs ${vpn_sid} dev veth0 |
| ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \ |
| via fd00::${rtdst} dev veth0 |
| |
| # set the decap route for decapsulating packets which arrive from |
| # the rtdst router and destined to the hsdst host. |
| ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \ |
| encap seg6local action End.DT4 vrftable ${tid} dev vrf-${tid} |
| |
| # all sids for VPNs start with a common locator which is fc00::/16. |
| # Routes for handling the SRv6 End.DT4 behavior instances are grouped |
| # together in the 'localsid' table. |
| # |
| # NOTE: added only once |
| if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \ |
| grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then |
| ip -netns ${rtdst_name} -6 rule add \ |
| to ${VPN_LOCATOR_SERVICE}::/16 \ |
| lookup ${LOCALSID_TABLE_ID} prio 999 |
| fi |
| } |
| |
| setup() |
| { |
| ip link add veth-rt-1 type veth peer name veth-rt-2 |
| # setup the networking for router rt-1 and router rt-2 |
| setup_ns rt_1 rt_2 |
| setup_rt_networking 1 |
| setup_rt_networking 2 |
| |
| # setup two hosts for the tenant 100. |
| # - host hs-1 is directly connected to the router rt-1; |
| # - host hs-2 is directly connected to the router rt-2. |
| setup_ns hs_t100_1 hs_t100_2 |
| setup_hs 1 1 100 #args: host router tenant |
| setup_hs 2 2 100 |
| |
| # setup two hosts for the tenant 200 |
| # - host hs-3 is directly connected to the router rt-1; |
| # - host hs-4 is directly connected to the router rt-2. |
| setup_ns hs_t200_3 hs_t200_4 |
| setup_hs 3 1 200 |
| setup_hs 4 2 200 |
| |
| # setup the IPv4 L3 VPN which connects the host hs-t100-1 and host |
| # hs-t100-2 within the same tenant 100. |
| setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant |
| setup_vpn_config 2 2 1 1 100 |
| |
| # setup the IPv4 L3 VPN which connects the host hs-t200-3 and host |
| # hs-t200-4 within the same tenant 200. |
| setup_vpn_config 3 1 4 2 200 |
| setup_vpn_config 4 2 3 1 200 |
| } |
| |
| check_rt_connectivity() |
| { |
| local rtsrc=$1 |
| local rtdst=$2 |
| eval local nsname=\${rt_${rtsrc}} |
| |
| ip netns exec ${nsname} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \ |
| >/dev/null 2>&1 |
| } |
| |
| check_and_log_rt_connectivity() |
| { |
| local rtsrc=$1 |
| local rtdst=$2 |
| |
| check_rt_connectivity ${rtsrc} ${rtdst} |
| log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}" |
| } |
| |
| check_hs_connectivity() |
| { |
| local hssrc=$1 |
| local hsdst=$2 |
| local tid=$3 |
| eval local nsname=\${hs_t${tid}_${hssrc}} |
| |
| ip netns exec ${nsname} ping -c 1 -W ${PING_TIMEOUT_SEC} \ |
| ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1 |
| } |
| |
| check_and_log_hs_connectivity() |
| { |
| local hssrc=$1 |
| local hsdst=$2 |
| local tid=$3 |
| |
| check_hs_connectivity ${hssrc} ${hsdst} ${tid} |
| log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})" |
| } |
| |
| check_and_log_hs_isolation() |
| { |
| local hssrc=$1 |
| local tidsrc=$2 |
| local hsdst=$3 |
| local tiddst=$4 |
| |
| check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc} |
| # NOTE: ping should fail |
| log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}" |
| } |
| |
| |
| check_and_log_hs2gw_connectivity() |
| { |
| local hssrc=$1 |
| local tid=$2 |
| |
| check_hs_connectivity ${hssrc} 254 ${tid} |
| log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})" |
| } |
| |
| router_tests() |
| { |
| log_section "IPv6 routers connectivity test" |
| |
| check_and_log_rt_connectivity 1 2 |
| check_and_log_rt_connectivity 2 1 |
| } |
| |
| host2gateway_tests() |
| { |
| log_section "IPv4 connectivity test among hosts and gateway" |
| |
| check_and_log_hs2gw_connectivity 1 100 |
| check_and_log_hs2gw_connectivity 2 100 |
| |
| check_and_log_hs2gw_connectivity 3 200 |
| check_and_log_hs2gw_connectivity 4 200 |
| } |
| |
| host_vpn_tests() |
| { |
| log_section "SRv6 VPN connectivity test among hosts in the same tenant" |
| |
| check_and_log_hs_connectivity 1 2 100 |
| check_and_log_hs_connectivity 2 1 100 |
| |
| check_and_log_hs_connectivity 3 4 200 |
| check_and_log_hs_connectivity 4 3 200 |
| } |
| |
| host_vpn_isolation_tests() |
| { |
| local i |
| local j |
| local k |
| local tmp |
| local l1="1 2" |
| local l2="3 4" |
| local t1=100 |
| local t2=200 |
| |
| log_section "SRv6 VPN isolation test among hosts in different tentants" |
| |
| for k in 0 1; do |
| for i in ${l1}; do |
| for j in ${l2}; do |
| check_and_log_hs_isolation ${i} ${t1} ${j} ${t2} |
| done |
| done |
| |
| # let us test the reverse path |
| tmp="${l1}"; l1="${l2}"; l2="${tmp}" |
| tmp=${t1}; t1=${t2}; t2=${tmp} |
| done |
| } |
| |
| if [ "$(id -u)" -ne 0 ];then |
| echo "SKIP: Need root privileges" |
| exit $ksft_skip |
| fi |
| |
| if [ ! -x "$(command -v ip)" ]; then |
| echo "SKIP: Could not run test without ip tool" |
| exit $ksft_skip |
| fi |
| |
| modprobe vrf &>/dev/null |
| if [ ! -e /proc/sys/net/vrf/strict_mode ]; then |
| echo "SKIP: vrf sysctl does not exist" |
| exit $ksft_skip |
| fi |
| |
| cleanup &>/dev/null |
| |
| setup |
| |
| router_tests |
| host2gateway_tests |
| host_vpn_tests |
| host_vpn_isolation_tests |
| |
| print_log_test_results |
| |
| cleanup &>/dev/null |
| |
| exit ${ret} |
