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A follow-up to 3733eec3e292e4ddb4cba5eb8d3bd8cbee7102d8
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Let's do this everywhere the same way.
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Keep the expired prefix for the duration of the prefix expiration event
and remove it afterwards.
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Save each new onlink IPv6 prefix and attach an expiry timer to it.
If the prefixes overlap, take the shorter prefix and write a debug
message about the event. Once the prefix is resent in a Router
Advertisement, update the timer. Add a new event for the expiring
prefix.
Add two helper functions, one for returning a prefix length given a
Router Advertisement and the other for generic prefix matching given
an IPv6 prefix and address.
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Update MTU according to the latest value received.
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Each ICMPv6 structure has an interface index and will therefore be
associated with an IPv6 link containing a list of of prefixes.
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As the IPv6 prefixes are needed, update the ICMPv6 Router Advertisement
code to dynamically allocate a suitably sized buffer. Iterate through
the ICMPv6 options one by one returning error if the option length is
too big to fit the buffer.
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This does not make a difference, but the code was confusing.
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- Rename log_meta() → log_internal(), to follow naming scheme of most
other log functions that are usually invoked through macros, but never
directly.
- Rename log_info_object() to log_object_info(), simply because the
object should be before any other parameters, to follow OO-style
programming style.
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log_error_errno() as log calls that take error numbers
This change has two benefits:
- The format string %m will now resolve to the specified error (or to
errno if the specified error is 0. This allows getting rid of a ton of
strerror() invocations, a function that is not thread-safe.
- The specified error can be passed to the journal in the ERRNO= field.
Now of course, we just need somebody to convert all cases of this:
log_error("Something happened: %s", strerror(-r));
into thus:
log_error_errno(-r, "Something happened: %m");
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To mirror the recent name change of the concept for sd_bus objects,
follow the same logic for sd_event_source objects, too.
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This should help in debugging failing event sources.
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The timeouts in the networking library (DHCP lease timeouts and similar) should not be affected
by suspend. In the cases where CLOCK_BOOTTIME is not implemented, it is still safe to fallback to
CLOCK_MONOTONIC, as the consumers of the library (i.e., networkd) _should_ renew the leases when
coming out of suspend.
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In some use cases stopping an ongoing ICMPv6 discovery is more
useful than always unreferencing the whole structure.
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Provide functions to bind the ICMPv6 socket to the approriate interface
and set multicast sending and receiving according to RFC 3493, section
5.2. and RFC 3542, sections 3. and 3.3. Filter out all ICMPv6 messages
except Router Advertisements for the socket in question according to
RFC 3542, section 3.2.
Send Router Solicitations to the all routers multicast group as
described in RFC 4861, section 6. and act on the received Router
Advertisments according to section 6.3.7.
Implement a similar API for ICMPv6 handling as is done for DHCPv4 and
DHCPv6.
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