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In DHCPv6-PD environment, where WAN interface requests IPv6 via DHCPv6,
receives the address as well as delegated prefixes, with LAN interfaces
serving those delegated prefixes in their router advertisement messages.
The LAN interfaces on the router themselves do not have
the IPv6 addresses assigned by networkd from the prefix it
serves on that interface. Now this patch enables it.
We need to fix RCC 2215 behaviour with rfc7550 errata
and https://tools.ietf.org/html/rfc8415.
[RFC3315] specifies that a client must ignore an Advertise message if
a server will not assign any addresses to a client, and [RFC3633]
specifies that a client must ignore an Advertise message if a server
returns the NoPrefixAvail status to a requesting router. Thus, a
client requesting both IA_NA and IA_PD, with a server that only
offers either addresses or delegated prefixes, is not supported by
the current protocol specifications.
Solution: a client SHOULD accept Advertise messages, even when not
all IA option types are being offered. And, in this case, the client
SHOULD include the not offered IA option types in its Request. A
client SHOULD only ignore an Advertise message when none of the
requested IA options include offered addresses or delegated prefixes.
Note that ignored messages MUST still be processed for SOL_MAX_RT and
INF_MAX_RT options as specified in [RFC7083].
Replace Section 17.1.3 of RFC 3315: (existing errata)
The client MUST ignore any Advertise message that includes a Status
Code option containing the value NoAddrsAvail, with the exception
that the client MAY display the associated status message(s) to the
user.
With the following text (which addresses the existing erratum
[Err2471] and includes the changes made by [RFC7083]):
The client MUST ignore any Advertise message that contains no
addresses (IAADDR options encapsulated in IA_NA or IA_TA options)
and no delegated prefixes (IAPREFIX options encapsulated in IA_PD
options; see RFC 3633) with the exception that the client:
- MUST process an included SOL_MAX_RT option (RFC 7083) and
- MUST process an included INF_MAX_RT option (RFC 7083).
A client can display any associated status message(s) to the user
or activity log.
The client ignoring this Advertise message MUST NOT restart the
Solicit retransmission timer.
Tracking down #15931 confused the hell out of me, since running homed in
gdb from the command line worked fine, but doing so as a service failed.
Let's make this more debuggable and check if we live in the host netns
when allocating a new udev monitor.
This is just debug stuff, so that if things don't work, a quick debug
run will reveal what is going on.
That said, while we are at it, also fix unexpected closing of passed in
fd when failing.
Clean up the naming of the sd-path enums. Previously, the more recently
added fields where named in the form SD_PATH_xyz_DIR and
SD_PATH_xyz_PATH, while the older fields where called just SD_PATH_xyz
and SD_PATH_SEARCH_xyz. Let's clean this up, to come to a more unified
way how we name this stuff.
I opted to stick to the old naming, i.e. dropthe suffixes. It's a bit of
a bike-shedding question of course, but I think there's a good reason to
avoid the additional DIR and PATH suffixes: the enum prefix contains
"PATH" anyway (i.e. "SD_PATH_"), so including PATH twice in each name is
redundant. Moreover, the key difference between the enums with the "dir"
and the "path" in the name is that the latter are *seach* paths, and I
think this is better emphasized by sticking to the "SEARCH" in the name.
Moreover dropping the suffixes makes the identifiers a lot shorter, in
particular in the "systemd-path" list output. And that's always good.
This means the naming pkgconfig file and in sd-path slightly deviate
(though the mapping is very simple), but I think that's OK, given that
this is developer facing and not user facing.
ROOTPREFIX doesn't include the trailing /, hence add it in where needed.
Also, given that sysctl.d/, binfmt.d/, sysusers.d/ are generally
accessed before /var/ is up they should use ROOTPREFIX rather than
PREFIX. Fix that.
Strictly speaking you can run homed without userdb. But it doesn't
really make much sense: they go hand in hand and implement the same
concepts, just for different sets of users. Let's hence disable both
automatically by default if homed is requested.
(We don't do the reverse: opting into userdbd shouldn't mean that you
are OK with homed.)
And of course, users can always deviate from our defaults easily, and
turn off userbd again right-away if they don't like it, and things will
generally work.
We ask for the TTL, then have enough space for it.
We probably can drop the extra cmsg space now, but let's figure that out
another time, since the extra cmsg space is used elsewhere in resolved
as well.
if someone implements https://systemd.io/BLOCK_DEVICE_LOCKING/ then we
shouldn't loudly complain about that.
This reverts back to the original behaviour from
3ebdb81ef0: when the lock is taken we
silently skip processing the device and sending out the messages for it.
This is a fix-up for a7c71d214c: since we
now don't wait for the job to finish anymore right after enqueuing it,
we should not exit our ptyfwd logic before the unit is back to inactive
*and* no job pending anymore.
