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![Andrea Mayer](/assets/img/avatar_default.png)
On some distributions, the rp_filter is automatically set (=1) by
default on a netdev basis (also on VRFs).
In an SRv6 End.DT46 behavior, decapsulated IPv4 packets are routed using
the table associated with the VRF bound to that tunnel. During lookup
operations, the rp_filter can lead to packet loss when activated on the
VRF.
Therefore, we chose to make this selftest more robust by explicitly
disabling the rp_filter during tests (as it is automatically set by some
Linux distributions).
Fixes: 03a0b567a0
("selftests: seg6: add selftest for SRv6 End.DT46 Behavior")
Reported-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Tested-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
576 lines
21 KiB
Bash
Executable file
576 lines
21 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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# author: Paolo Lungaroni <paolo.lungaroni@uniroma2.it>
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# This test is designed for evaluating the new SRv6 End.DT46 Behavior used for
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# implementing IPv4/IPv6 L3 VPN use cases.
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#
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# The current SRv6 code in the Linux kernel only implements SRv6 End.DT4 and
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# End.DT6 Behaviors which can be used respectively to support IPv4-in-IPv6 and
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# IPv6-in-IPv6 VPNs. With End.DT4 and End.DT6 it is not possible to create a
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# single SRv6 VPN tunnel to carry both IPv4 and IPv6 traffic.
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# The SRv6 End.DT46 Behavior implementation is meant to support the
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# decapsulation of IPv4 and IPv6 traffic coming from a single SRv6 tunnel.
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# Therefore, the SRv6 End.DT46 Behavior in the Linux kernel greatly simplifies
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# the setup and operations of SRv6 VPNs.
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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/IPv6 L3 VPN services allowing hosts to communicate with
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# each 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
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# IPv4/IPv6 L3 VPN of tenant 100 while hs-t200-3 and hs-t200-4 are connected
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# using the IPv4/IPv6 L3 VPN of tenant 200. Cross connection between tenant 100
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# and tenant 200 is forbidden and thus, for example, hs-t100-1 cannot reach
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# hs-t200-3 and vice versa.
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#
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# Routers rt-1 and rt-2 implement IPv4/IPv6 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.DT46 Behavior and c) VRF.
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#
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# To explain how an IPv4/IPv6 L3 VPN based on SRv6 works, let us briefly
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# consider an example where, within the same domain of tenant 100, the host
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# hs-t100-1 pings 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 a arp/ndp proxy.
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#
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# When the host hs-t100-1 sends an IPv6 or IPv4 packet destined to hs-t100-2,
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# the 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 IPv6 or IPv4 packet in a IPv6 plus the
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# Segment Routing Header (SRH) packet. This packet is sent through the (IPv6)
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# core 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.DT46 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 IPv6 or IPv4 packet. Afterwards, the packet is sent to the
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# host 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 roles of rt-1
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# and rt-2 are swapped.
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#
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# Of course, the IPv4/IPv6 L3 VPN for tenant 200 works exactly as the IPv4/IPv6
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# L3 VPN for tenant 100. In this case, only hosts hs-t200-3 and hs-t200-4 are
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# able to 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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# | | cafe::1/64 | | | | cafe::2/64 | |
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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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# | | cafe::254/64 | | | | cafe::254/64 | |
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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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# | | cafe::254/64 | | | | cafe::254/64 | |
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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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# | | cafe::3/64 | | | | cafe::4/64 | |
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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::6046|apply SRv6 End.DT46 vrftable 100|
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# +--------------------------------------------------+
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# |fc00:21:200::6046|apply SRv6 End.DT46 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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# |cafe::2 |apply seg6 encap segs fc00:12:100::6046|
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# +---------------------------------------------------+
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# |cafe::/64 |forward to dev veth-t100 |
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# +---------------------------------------------------+
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# |10.0.0.2 |apply seg6 encap segs fc00:12:100::6046|
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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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# |cafe::4 |apply seg6 encap segs fc00:12:200::6046|
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# +---------------------------------------------------+
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# |cafe::/64 |forward to dev veth-t200 |
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# +---------------------------------------------------+
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# |10.0.0.4 |apply seg6 encap segs fc00:12:200::6046|
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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::6046|apply SRv6 End.DT46 vrftable 100|
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# +--------------------------------------------------+
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# |fc00:12:200::6046|apply SRv6 End.DT46 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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# |cafe::1 |apply seg6 encap segs fc00:21:100::6046|
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# +---------------------------------------------------+
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# |cafe::/64 |forward to dev veth-t100 |
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# +---------------------------------------------------+
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# |10.0.0.1 |apply seg6 encap segs fc00:21:100::6046|
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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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# |cafe::3 |apply seg6 encap segs fc00:21:200::6046|
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# +---------------------------------------------------+
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# |cafe::/64 |forward to dev veth-t200 |
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# +---------------------------------------------------+
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# |10.0.0.3 |apply seg6 encap segs fc00:21:200::6046|
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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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# Kselftest framework requirement - SKIP code is 4.
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ksft_skip=4
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readonly LOCALSID_TABLE_ID=90
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readonly IPv6_RT_NETWORK=fd00
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readonly IPv6_HS_NETWORK=cafe
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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 exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
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ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
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ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/64 dev veth0 nodad
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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 exec ${hsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
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ip netns exec ${hsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
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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.default.rp_filter=0
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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 ${IPv6_HS_NETWORK}::${hs}/64 dev veth0 nodad
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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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ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0
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ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0
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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 ${IPv6_HS_NETWORK}::254/64 dev ${rtveth} nodad
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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 ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1
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ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1
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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-${rtdst}
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local rtveth=veth-t${tid}
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local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6046
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ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
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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} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 vrf vrf-${tid} \
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encap seg6 mode encap segs ${vpn_sid} dev veth0
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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.DT46 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.DT46 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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# set default routes to unreachable for both ipv4 and ipv6
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ip -netns ${rtsrc_name} -6 route add unreachable default metric 4278198272 \
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vrf vrf-${tid}
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ip -netns ${rtsrc_name} -4 route add unreachable default metric 4278198272 \
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vrf vrf-${tid}
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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/IPv6 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/IPv6 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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}
|
|
|
|
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}
|