mainlining shenanigans
20a081b798
SRv6 End.DT6 is defined in the SRv6 Network Programming [1]. The Linux kernel already offers an implementation of the SRv6 End.DT6 behavior which permits IPv6 L3 VPNs over SRv6 networks. This implementation is not particularly suitable in contexts where we need to deploy IPv6 L3 VPNs among different tenants which share the same network address schemes. The underlying problem lies in the fact that the current version of DT6 (called legacy DT6 from now on) needs a complex configuration to be applied on routers which requires ad-hoc routes and routing policy rules to ensure the correct isolation of tenants. Consequently, a new implementation of DT6 has been introduced with the aim of simplifying the construction of IPv6 L3 VPN services in the multi-tenant environment using SRv6 networks. To accomplish this task, we reused the same VRF infrastructure and SRv6 core components already exploited for implementing the SRv6 End.DT4 behavior. Currently the two End.DT6 implementations coexist seamlessly and can be used depending on the context and the user preferences. So, in order to support both versions of DT6 a new attribute (vrftable) has been introduced which allows us to differentiate the implementation of the behavior to be used. A SRv6 End.DT6 legacy behavior is still instantiated using a command like the following one: $ ip -6 route add 2001:db8::1 encap seg6local action End.DT6 table 100 dev eth0 While to instantiate the SRv6 End.DT6 in VRF mode, the command is still pretty straight forward: $ ip -6 route add 2001:db8::1 encap seg6local action End.DT6 vrftable 100 dev eth0. Obviously as in the case of SRv6 End.DT4, the VRF strict_mode parameter must be set (net.vrf.strict_mode=1) and the VRF associated with table 100 must exist. Please note that the instances of SRv6 End.DT6 legacy and End.DT6 VRF mode can coexist in the same system/configuration without problems. [1] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
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| Kbuild | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.