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This drops stuct ifa_cacheinfo from Address, and store lifetime with
usec_t.
Why? Now, all requests of address configurations are once stored in
the request queue, and will be processed when it is ready. So, the
timestamp value passed to the kernel must be evaluated on configure.
This also fixes the following two issues.
- Time values in struct ifa_cacheinfo are stored in uint32_t.
So, the validity check of the address configured by NDisc may fail on
long running systems.
- If a system uses DHCPv6PD, when an interface may appear or be
reconfigured later, then the lifetime value may be inappropriate.
We need to adjust the lifetime with the current time and the timestamp
of the lease.
It is now ran on the nightly CentOS build, so that it can cover
integration tests too, and not just unit tests. It's nightly as
it considerably increases the integration test runtime, so it's
not appropriate for all PRs.
This is supposed to be used by package/image builders such as mkosi to
speed up building, since it allows us to suppress sync() inside a
container.
This does what Debian's eatmydata tool does, but for a container, and
via seccomp (instead of LD_PRELOAD).
The whole reason loop_device_make_internal() exists (as opposed to just
loop_device_make()) is to avoid mangling the loop flags value/call
getenv twice. Hence let's actually call it when we already mangled the
flags value.
When Assign= in [DHCPv6PrefixDelegation] is enabled, then the kernel
will create the prefix route for the assigned address with metric 256.
When Assign= is disabled, then the kernel will create the route with
metric 1024.
For the default value, we should choose a smaller value (higher priority)
than 1024, as the unreachable routes for delegated prefix will be
configured with 1024.
For static IPv6 routes without metric is specified, then we use 1024.
But such an adjustment is not performed to dynamic routes. So, let's
specify the metric explicitly.
Otherwise, configured routes will be handled as foreign.
Note that the kernel (at least 5.14.11) seems not to support lifetime
for IPv6 unreachable routes. The lifetime for routes of the type will be
handled by sd-event's timer event source.
So, we cannot confirm the lifetime with 'ip route' command.
Even in newer kernel version, it seems that some route type does not
support expiration, e.g. IPv4 route or unreachable route. Let's use
timer event source for such routes.
