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48af842f4e
[ Upstream commit 8b53f46eb430fe5b42d485873b85331d2de2c469 ]
With a VRF, ipv4 and ipv6 FIB expression behave differently.
fib daddr . iif oif
Will return the input interface name for ipv4, but the real device
for ipv6. Example:
If VRF device name is tvrf and real (incoming) device is veth0.
First round is ok, both ipv4 and ipv6 will yield 'veth0'.
But in the second round (incoming device will be set to "tvrf"), ipv4
will yield "tvrf" whereas ipv6 returns "veth0" for the second round too.
This makes ipv6 behave like ipv4.
A followup patch will add a test case for this, without this change
it will fail with:
get element inet t fibif6iif { tvrf . dead:1::99 . tvrf }
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FAIL: did not find tvrf . dead:1::99 . tvrf in fibif6iif
Alternatively we could either not do anything at all or change
ipv4 to also return the lower/real device, however, nft (userspace)
doc says "iif: if fib lookup provides a route then check its output
interface is identical to the packets input interface." which is what
the nft fib ipv4 behaviour is.
Fixes:
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| kernel | ||
| lib | ||
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| net | ||
| samples | ||
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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.