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 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 #
 # author: Andrea Mayer <andrea.mayer@uniroma2.it>
 # author: Paolo Lungaroni <paolo.lungaroni@uniroma2.it>
 
 # This test is designed for evaluating the new SRv6 End.DT46 Behavior used for
 # implementing IPv4/IPv6 L3 VPN use cases.
 #
 # The current SRv6 code in the Linux kernel only implements SRv6 End.DT4 and
 # End.DT6 Behaviors which can be used respectively to support IPv4-in-IPv6 and
 # IPv6-in-IPv6 VPNs. With End.DT4 and End.DT6 it is not possible to create a
 # single SRv6 VPN tunnel to carry both IPv4 and IPv6 traffic.
 # The SRv6 End.DT46 Behavior implementation is meant to support the
 # decapsulation of IPv4 and IPv6 traffic coming from a single SRv6 tunnel.
 # Therefore, the SRv6 End.DT46 Behavior in the Linux kernel greatly simplifies
 # the setup and operations of SRv6 VPNs.
 #
 # Hereafter a network diagram is shown, where two different tenants (named 100
 # and 200) offer IPv4/IPv6 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/IPv6 L3 VPN of tenant 100 while hs-t200-3 and hs-t200-4 are connected
 # using the IPv4/IPv6 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/IPv6 L3 VPN services leveraging the SRv6
 # architecture. The key components for such VPNs are: a) SRv6 Encap behavior,
 # b) SRv6 End.DT46 Behavior and c) VRF.
 #
 # To explain how an IPv4/IPv6 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 a arp/ndp proxy.
 #
 # When the host hs-t100-1 sends an IPv6 or 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 IPv6 or 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.DT46 Behavior removes the outer IPv6+SRH headers and
 # performs the lookup on the vrf-100 table using the destination address of
 # the decapsulated IPv6 or 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 roles of rt-1
 # and rt-2 are swapped.
 #
 # Of course, the IPv4/IPv6 L3 VPN for tenant 200 works exactly as the IPv4/IPv6
 # 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    |  |
 # |  |  cafe::1/64 |  |                                   |  |  cafe::2/64 |  |
 # |  | 10.0.0.1/24 |  |                                   |  | 10.0.0.2/24 |  |
 # |  +-------------+  |                                   |  +-------------+  |
 # |        .          |                                   |         .         |
 # +-------------------+                                   +-------------------+
 #          .                                                        .
 #          .                                                        .
 #          .                                                        .
 # +-----------------------------------+   +-----------------------------------+
 # |        .                          |   |                         .         |
 # | +---------------+                 |   |                 +---------------- |
 # | |   veth-t100   |                 |   |                 |   veth-t100   | |
 # | |  cafe::254/64 |                 |   |                 |  cafe::254/64 | |
 # | | 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   | |
 # | |  cafe::254/64 |                 |   |                 |  cafe::254/64 | |
 # | | 10.0.0.254/24 |                 |   |                 | 10.0.0.254/24 | |
 # | +---------------+      rt-1 netns |   | rt-2 netns      +---------------- |
 # |        .                          |   |                          .        |
 # +-----------------------------------+   +-----------------------------------+
 #          .                                                         .
 #          .                                                         .
 #          .                                                         .
 #          .                                                         .
 # +-------------------+                                   +-------------------+
 # |        .          |                                   |          .        |
 # |  +-------------+  |                                   |  +-------------+  |
 # |  |    veth0    |  |                                   |  |    veth0    |  |
 # |  |  cafe::3/64 |  |                                   |  |  cafe::4/64 |  |
 # |  | 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::6046|apply SRv6 End.DT46 vrftable 100|
 # +--------------------------------------------------+
 # |fc00:21:200::6046|apply SRv6 End.DT46 vrftable 200|
 # +--------------------------------------------------+
 #
 # rt-1: VRF tenant 100 (table 100)
 # +---------------------------------------------------+
 # |host       |Action                                 |
 # +---------------------------------------------------+
 # |cafe::2    |apply seg6 encap segs fc00:12:100::6046|
 # +---------------------------------------------------+
 # |cafe::/64  |forward to dev veth-t100               |
 # +---------------------------------------------------+
 # |10.0.0.2   |apply seg6 encap segs fc00:12:100::6046|
 # +---------------------------------------------------+
 # |10.0.0.0/24|forward to dev veth-t100               |
 # +---------------------------------------------------+
 #
 # rt-1: VRF tenant 200 (table 200)
 # +---------------------------------------------------+
 # |host       |Action                                 |
 # +---------------------------------------------------+
 # |cafe::4    |apply seg6 encap segs fc00:12:200::6046|
 # +---------------------------------------------------+
 # |cafe::/64  |forward to dev veth-t200               |
 # +---------------------------------------------------+
 # |10.0.0.4   |apply seg6 encap segs fc00:12:200::6046|
 # +---------------------------------------------------+
 # |10.0.0.0/24|forward to dev veth-t200               |
 # +---------------------------------------------------+
 #
 #
 # rt-2: localsid table (table 90)
 # +--------------------------------------------------+
 # |SID              |Action                          |
 # +--------------------------------------------------+
 # |fc00:12:100::6046|apply SRv6 End.DT46 vrftable 100|
 # +--------------------------------------------------+
 # |fc00:12:200::6046|apply SRv6 End.DT46 vrftable 200|
 # +--------------------------------------------------+
 #
 # rt-2: VRF tenant 100 (table 100)
 # +---------------------------------------------------+
 # |host       |Action                                 |
 # +---------------------------------------------------+
 # |cafe::1    |apply seg6 encap segs fc00:21:100::6046|
 # +---------------------------------------------------+
 # |cafe::/64  |forward to dev veth-t100               |
 # +---------------------------------------------------+
 # |10.0.0.1   |apply seg6 encap segs fc00:21:100::6046|
 # +---------------------------------------------------+
 # |10.0.0.0/24|forward to dev veth-t100               |
 # +---------------------------------------------------+
 #
 # rt-2: VRF tenant 200 (table 200)
 # +---------------------------------------------------+
 # |host       |Action                                 |
 # +---------------------------------------------------+
 # |cafe::3    |apply seg6 encap segs fc00:21:200::6046|
 # +---------------------------------------------------+
 # |cafe::/64  |forward to dev veth-t200               |
 # +---------------------------------------------------+
 # |10.0.0.3   |apply seg6 encap segs fc00:21:200::6046|
 # +---------------------------------------------------+
 # |10.0.0.0/24|forward to dev veth-t200               |
 # +---------------------------------------------------+
 #
 
 # Kselftest framework requirement - SKIP code is 4.
 ksft_skip=4
 
 readonly LOCALSID_TABLE_ID=90
 readonly IPv6_RT_NETWORK=fd00
 readonly IPv6_HS_NETWORK=cafe
 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
 
         # destroy routers rt-* and hosts hs-*
         for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do
                 ip netns del ${ns} || true
         done
 }
 
 # Setup the basic networking for the routers
 setup_rt_networking()
 {
         local rt=$1
         local nsname=rt-${rt}
 
         ip netns add ${nsname}
         ip link set veth-rt-${rt} netns ${nsname}
         ip -netns ${nsname} link set veth-rt-${rt} name veth0
 
         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 -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/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 hs=$1
         local rt=$2
         local tid=$3
         local hsname=hs-t${tid}-${hs}
         local rtname=rt-${rt}
         local rtveth=veth-t${tid}
 
         # set the networking for the host
         ip netns add ${hsname}
 
         ip netns exec ${hsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
         ip netns exec ${hsname} sysctl -wq net.ipv6.conf.default.accept_dad=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 ${IPv6_HS_NETWORK}::${hs}/64 dev veth0 nodad
         ip -netns ${hsname} addr add ${IPv4_HS_NETWORK}.${hs}/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
 
         ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0
         ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0
 
         # 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 ${IPv6_HS_NETWORK}::254/64 dev ${rtveth} nodad
         ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.254/24 dev ${rtveth}
         ip -netns ${rtname} link set ${rtveth} up
 
         ip netns exec ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1
         ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1
 
         # 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 ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.rp_filter=0
 
         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
 
         local hssrc_name=hs-t${tid}-${hssrc}
         local hsdst_name=hs-t${tid}-${hsdst}
         local rtsrc_name=rt-${rtsrc}
         local rtdst_name=rt-${rtdst}
         local rtveth=veth-t${tid}
         local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6046
 
         ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
 
         # set the encap route for encapsulating packets which arrive from the
         # host hssrc and destined to the access router rtsrc.
         ip -netns ${rtsrc_name} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 vrf vrf-${tid} \
                 encap seg6 mode encap segs ${vpn_sid} dev veth0
         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.DT46 vrftable ${tid} dev vrf-${tid}
 
         # all sids for VPNs start with a common locator which is fc00::/16.
         # Routes for handling the SRv6 End.DT46 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
 
         # set default routes to unreachable for both ipv4 and ipv6
         ip -netns ${rtsrc_name} -6 route add unreachable default metric 4278198272 \
                 vrf vrf-${tid}
 
         ip -netns ${rtsrc_name} -4 route add unreachable default metric 4278198272 \
                 vrf vrf-${tid}
 }
 
 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_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_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_hs 3 1 200
         setup_hs 4 2 200
 
         # setup the IPv4/IPv6 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/IPv6 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
 
         ip netns exec rt-${rtsrc} 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_ipv6_connectivity()
 {
         local hssrc=$1
         local hsdst=$2
         local tid=$3
 
         ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
                 ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1
 }
 
 check_hs_ipv4_connectivity()
 {
         local hssrc=$1
         local hsdst=$2
         local tid=$3
 
         ip netns exec hs-t${tid}-${hssrc} 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_ipv6_connectivity ${hssrc} ${hsdst} ${tid}
         log_test $? 0 "IPv6 Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
 
         check_hs_ipv4_connectivity ${hssrc} ${hsdst} ${tid}
         log_test $? 0 "IPv4 Hosts connectivity: hs-t${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_ipv6_connectivity ${hssrc} ${hsdst} ${tidsrc}
         # NOTE: ping should fail
         log_test $? 1 "IPv6 Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
 
         check_hs_ipv4_connectivity ${hssrc} ${hsdst} ${tidsrc}
         # NOTE: ping should fail
         log_test $? 1 "IPv4 Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
 
 }
 
 
 check_and_log_hs2gw_connectivity()
 {
         local hssrc=$1
         local tid=$2
 
         check_hs_ipv6_connectivity ${hssrc} 254 ${tid}
         log_test $? 0 "IPv6 Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
 
         check_hs_ipv4_connectivity ${hssrc} 254 ${tid}
         log_test $? 0 "IPv4 Hosts connectivity: hs-t${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/IPv6 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}

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