2020-12-02 16:05:17 +03:00
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# author: Andrea Mayer <andrea.mayer@uniroma2.it>
# author: Paolo Lungaroni <paolo.lungaroni@cnit.it>
# This test is designed for evaluating the new SRv6 End.DT6 behavior used for
# implementing IPv6 L3 VPN use cases.
#
# Hereafter a network diagram is shown, where two different tenants (named 100
# and 200) offer 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 IPv6
# L3 VPN of tenant 100 while hs-t200-3 and hs-t200-4 are connected using the
# 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 IPv6 L3 VPN services leveraging the SRv6
# architecture. The key components for such VPNs are: a) SRv6 Encap behavior,
# b) SRv6 End.DT6 behavior and c) VRF.
#
# To explain how an 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 ndp proxy.
#
# When the host hs-t100-1 sends an IPv6 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 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.DT6 behavior removes the outer IPv6+SRH headers and
# performs the lookup on the vrf-100 table using the destination address of
# the decapsulated IPv6 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 IPv6 L3 VPN for tenant 200 works exactly as the 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 | |
# | +-------------+ | | +-------------+ |
# | . | | . |
# +-------------------+ +-------------------+
# . .
# . .
# . .
# +-----------------------------------+ +-----------------------------------+
# | . | | . |
# | +---------------+ | | +---------------- |
# | | veth-t100 | | | | veth-t100 | |
# | | cafe::254/64 | +----------+ | | +----------+ | cafe::254/64 | |
# | +-------+-------+ | 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 | |
# | +---------------+ rt-1 netns | | rt-2 netns +---------------- |
# | . | | . |
# +-----------------------------------+ +-----------------------------------+
# . .
# . .
# . .
# . .
# +-------------------+ +-------------------+
# | . | | . |
# | +-------------+ | | +-------------+ |
# | | veth0 | | | | veth0 | |
# | | cafe::3/64 | | | | cafe::4/64 | |
# | +-------------+ | | +-------------+ |
# | | | |
# | hs-t200-3 netns | | hs-t200-4 netns |
# | | | |
# +-------------------+ +-------------------+
#
#
# ~~~~~~~~~~~~~~~~~~~~~~~~~
# | Network configuration |
# ~~~~~~~~~~~~~~~~~~~~~~~~~
#
# rt-1: localsid table (table 90)
# +-------------------------------------------------+
# |SID |Action |
# +-------------------------------------------------+
# |fc00:21:100::6006|apply SRv6 End.DT6 vrftable 100|
# +-------------------------------------------------+
# |fc00:21:200::6006|apply SRv6 End.DT6 vrftable 200|
# +-------------------------------------------------+
#
# rt-1: VRF tenant 100 (table 100)
# +---------------------------------------------------+
# |host |Action |
# +---------------------------------------------------+
# |cafe::2 |apply seg6 encap segs fc00:12:100::6006|
# +---------------------------------------------------+
# |cafe::/64 |forward to dev veth_t100 |
# +---------------------------------------------------+
#
# rt-1: VRF tenant 200 (table 200)
# +---------------------------------------------------+
# |host |Action |
# +---------------------------------------------------+
# |cafe::4 |apply seg6 encap segs fc00:12:200::6006|
# +---------------------------------------------------+
# |cafe::/64 |forward to dev veth_t200 |
# +---------------------------------------------------+
#
#
# rt-2: localsid table (table 90)
# +-------------------------------------------------+
# |SID |Action |
# +-------------------------------------------------+
# |fc00:12:100::6006|apply SRv6 End.DT6 vrftable 100|
# +-------------------------------------------------+
# |fc00:12:200::6006|apply SRv6 End.DT6 vrftable 200|
# +-------------------------------------------------+
#
# rt-2: VRF tenant 100 (table 100)
# +---------------------------------------------------+
# |host |Action |
# +---------------------------------------------------+
# |cafe::1 |apply seg6 encap segs fc00:21:100::6006|
# +---------------------------------------------------+
# |cafe::/64 |forward to dev veth_t100 |
# +---------------------------------------------------+
#
# rt-2: VRF tenant 200 (table 200)
# +---------------------------------------------------+
# |host |Action |
# +---------------------------------------------------+
# |cafe::3 |apply seg6 encap segs fc00:21:200::6006|
# +---------------------------------------------------+
# |cafe::/64 |forward to dev veth_t200 |
# +---------------------------------------------------+
#
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# Kselftest framework requirement - SKIP code is 4.
ksft_skip = 4
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readonly LOCALSID_TABLE_ID = 90
readonly IPv6_RT_NETWORK = fd00
readonly IPv6_HS_NETWORK = cafe
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.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 } 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 } link set ${ rtveth } up
ip netns exec ${ rtname } sysctl -wq net.ipv6.conf.${ rtveth } .proxy_ndp= 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 = $5
local hssrc_name = hs-t${ 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 } ::6006
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 } -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.DT6 vrftable ${ tid } dev vrf-${ tid }
# all sids for VPNs start with a common locator which is fc00::/16.
# Routes for handling the SRv6 End.DT6 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_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 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 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_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_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 "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"
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exit $ksft_skip
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fi
if [ ! -x " $( command -v ip) " ] ; then
echo "SKIP: Could not run test without ip tool"
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exit $ksft_skip
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fi
modprobe vrf & >/dev/null
if [ ! -e /proc/sys/net/vrf/strict_mode ] ; then
echo "SKIP: vrf sysctl does not exist"
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exit $ksft_skip
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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 }
