On 6/8/21 4:40 AM, Andrea Mayer wrote: > this selftest is designed for evaluating the new SRv6 End.DT46 Behavior > used, in this example, for implementing IPv4/IPv6 L3 VPN use cases. > > Signed-off-by: Andrea Mayer <andrea.mayer@xxxxxxxxxxx> > Signed-off-by: Paolo Lungaroni <paolo.lungaroni@xxxxxxxxxxx> > --- > .../selftests/net/srv6_end_dt46_l3vpn_test.sh | 573 ++++++++++++++++++ > 1 file changed, 573 insertions(+) > create mode 100755 tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh > > diff --git a/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh b/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh > new file mode 100755 > index 000000000000..d1e156433b98 > --- /dev/null > +++ b/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh > @@ -0,0 +1,573 @@ > +#!/bin/bash > +# SPDX-License-Identifier: GPL-2.0 > +# > +# author: Andrea Mayer <andrea.mayer@xxxxxxxxxxx> > +# author: Paolo Lungaroni <paolo.lungaroni@xxxxxxxxxxx> > + > +# 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 role 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 | > +# +---------------------------------------------------+ > +# > + Great description of the test; thanks for adding that documentation. Acked-by: David Ahern <dsahern@xxxxxxxxxx>
