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